SLED Opportunity · MASSACHUSETTS · CITY OF CAMBRIDGE
AI Summary
City of Cambridge seeks bids for water system treatment and testing services including chemical treatment, water quality analysis, corrosion control, and maintenance for HVAC and water systems in multiple buildings. Requires certified water technologist and extensive experience. Bid due April 9, 2026.
The City of Cambridge would like to invite you to submit a bid for Water System Treatment & Testing. If submitting electronically, Bids are to be submitted through the Procurement Portal at https://procurement.opengov.com/portal/cambridgema. Bids are to be submitted no later than 11:00 am on Thursday, April 9, 2026.
1.01 Summary
A. The City of Cambridge is soliciting Water Testing and Treatment Services for buildings listed in the Appendix A Matrix (Attachment A) for four (4) types of water systems: cooling towers, including RO Systems; domestic water, including water softener systems; chilled water; and hot water. Not all buildings contain all types of systems, as identified in the Appendix A: Water Treatment of Systems by Building Matrix.
1.02 Work To Be Performed
A. The work described herein shall be interpreted as work to be done by this vendor.
B. Furnish all labor, materials, and perform all operations in connection with the requirements of testing and treatment of Water System as identified in Appendix A Matrix.
1.03 Definitions
A. Most terms used within the documents are industry standard. Certain words or phrases shall be understood to have specific meanings as follows:
1. Provide: Furnish and install completely connected and in operable condition.
2. Furnish: Purchase and deliver to a specific location within the building or site.
3. Install: With respect to equipment furnished by others, install means to receive, unpack, move into position, mount and connect, including removal of packaging materials.
4. Connect: To duct, pipe or wire up, including all branch ductwork, piping, and/or circuitry, control and disconnection devices so item is complete and ready for operation.
5. Subject to Mechanical Damage: Equipment, ductwork, piping and raceways installed exposed and less than eight feet above finished floor in mechanical rooms or other areas where heavy equipment may be in use or moved.
6. TSS: Total suspended solids are solid materials, including organic and inorganic, that are suspended in the water. These solids may include silt, plankton, and industrial wastes.
7. TDS: Total dissolved solids are dissolved minerals in water. This can be measured also by Conductivity. These solids may include calcium, sodium, magnesium and many others.
8. OIL AND GREASE: Measure of Oils and Greases in a water sample.
9. TOC: Total Organic Carbon measures organic material in the water.
10. MIC: Microbiologically Induced Corrosion.
11. SRB: Sulfate Reducing Bacteria a type of bacteria that causes Microbiologically Induced Corrosion.
12. IRB: Iron Related Bacteria a type of bacteria that causes Microbiologically Induced Corrosion.
13. AWT: Association of Water Technologies, Inc. – https://www.awt.org
14. CWT: Certified Water Technologist – Certification for Water Treatment Professional includes requirements for education, passing certification test and other requirements. Certification has to be maintained by further education and requirement. https://www.awt.org/certification/
15. Certified Water Technologist (CWT) – The CWT is a certification that shows the holder to have the expertise, experience, and knowledge to provide the highest standards of service for providing and monitoring a water treatment program. They pride themselves on making facilities as efficient as possible using the latest water treatment technology and techniques to save energy and prevent scale, corrosion, fouling, deposition and microbiological growth.
16. Individuals with the CWT designation have personally committed themselves to excellence in the water treatment industry. Each CWT has passed a rigorous exam that covers all aspects of water treatment technology, and they must recertify every five years to maintain the credential. The CWT designation is administered by the Association of Water Technologies.
1.04 Performance Requirements
A. Water quality for HVAC systems shall minimize corrosion, scale buildup, and biological growth for optimum efficiency of HVAC equipment without creating a hazard to operating personnel or the environment.
B. Base HVAC water treatment on quality of water available at Project site and discharge limitations, HVAC system equipment material characteristics and functional performance characteristics, operating personnel capabilities, and requirements and guidelines of authorities having jurisdiction. A formal report shall be supplied to the General Contractor, Architect and Engineer documenting that the Water Treatment Service Provider tested and analyzed the project’s incoming site water describing its characteristics and issues with the water that can impact the above in relationship to the metallurgy being used in the system and the equipment being used in the system and any issues the Water Treatment Professional finds during the initial site visit.
C. The Water Treatment Provider will provide hydrotesting corrosion inhibitors and a biocide to the Mechanical Contractor for addition to the system during hydrotesting, to prevent flash rusting, corrosion and biological growth during stagnant conditions or if the system must be drained to fix leaks or because of potential lines freezing during the winter months during the construction time period. The Water Treatment Provider will verify material was added and list in formal report to the General Contractor, Architect and Engineer.
D. The pre-cleaning and flushing of the systems must be done with the oversight of the Water Treatment Service Provider. It must also be documented in a formal report supplied to the General Contractor, Architect and Engineer, documenting the steps taken during pre-cleaning and flushing, the water analyses done during each of the steps and a final flushing water quality analysis with particle size distribution analyses being conducted on the final flush water.
E. The formal report shall also document the quality of the treated system. The quality of the treated water must meet the specifications set forth by the HVAC equipment manufacturer, if there are any. If no such specifications exist for the equipment a full analysis must be done, including a particle size distribution analysis, that documents the quality of the water/fluid.
F. The water chemistry and quality of the chemical treatment program will influence the corrosion rates of the system. These shall be measured by corrosion coupons using un-passivated coupons and following the ASTM procedures for monitoring corrosion rates. A 30-day coupon installed after cleaning, flushing and treatment of the system should yield the following results for the closed loop systems being treated with a formal report being issued to the general contractor and project engineer by the Water Treatment Provider:
1. Carbon Steel (C101): Less than or equal to 0.2 mpy.
2. Copper (CDA110): Less than or equal to 0.1 mpy.
3. Aluminum if used in equipment (7000 Series): Less than or equal to 0.1 mpy.
Note: These rates assume that the metal loss is uniform with no pitting or localized attack including gouging, etching, microbial attack or crevice attack. Conditions such as those are not acceptable. If they are noted the cause should be addressed with follow-up testing to confirm improvement. Localized attack at the coupon holder may be ignored if the treatment is unable to interact with the coupon in this area and no other abnormalities are noted.
G. The water chemistry and quality of the chemical treatment program will influence the biological growth in the system. This shall be measured by Biological Dip Slides or Total Plate Counts, SRB and IRB analyses. All protocols should yield a non-detectable biological growth. A formal report shall be issued to the General Contractor and Engineer to provide evidence of this by the Water Treatment Provider.
H. The corrosion rates in the system must be maintained at the above levels for the full two years of service required under this contract. They must be monitored quarterly for the two years and documented in reports sent to the Engineer and the Owner’s Representative.
I. The biological growth rates in the system must be maintained at non-detectable levels for the two full years of service. They must also be monitored monthly for the cooling tower and quarterly for the closed loops and documented in reports sent to the Engineer and the Owner’s Representative.
J. A full water or fluid analysis on each closed loop system must be done semi-annually, including a particle size distribution analysis, during the two years of service. The findings of each analysis shall be documented and submitted in a report sent to the Engineer and the Owner’s Representative by the Water Treatment Provider.
K. NOTE: THE WATER TREATMENT SERVICE PROVIDER MUST VERIFY THAT ALL CHEMICALS USED DURING THE ABOVE ARE COMPATIBLE WITH THE EQUIPMENT CONNECTED TO THE SYSTEM AND THE METALLURGY OF THE SYSTEM. THE QUALITY OF THE TREATED WATER MUST MEET THE SPECIFICATIONS SET FORTH BY THE HVAC EQUIPMENT MANUFACTURER FOR ALL PIECES OF EQUIPMENT IN THE SYSTEM, IF THERE ARE ANY.
1.05 Codes, Ordinances, And Permits
A. Perform all work in accordance with all Federal, State and Local laws and regulations. All permit fees shall be the responsibility of the Water Treatment Service Provider.
1.06 Quality Assurance
A. Codes and Standards:
1. HI Compliance: Design, manufacture, and install HVAC pumps in accordance with HI Hydraulic Institute Standards".
2. UL Compliance: Design, manufacture, and install HVAC pumps in accordance with UL 779 "Motor Operated Water Pumps".
3. ANSI Standards: Comply with ANSI A13.1 for pipe, valve, and equipment identification.
4. FM Compliance: Provide control devices and control sequences in accordance with requirements of Factory Mutual System (FM).
5. IRI Compliance: Provided control devices and control sequences in accordance with requirements of Industrial Risk Insurance (IRI).
6. UL and NEMA Compliance: Provide electrical components which have been listed and labeled by UL and comply with NEMA standards.
7. NEC Compliance: Comply with National Electrical Code (NFPA 70) as applicable to installation and electrical connections of ancillary electrical components.
B. MSS Standard Practices: Comply with the following standards for valves:
1. MSS SP-45: Bypass and Drain Connection Standard
2. MSS SP-67: Butterfly Valves
3. MSS SP-70: Cast Iron Gate Valves, Flanged and Threaded Ends
4. MSS SP-71: Cast Iron Swing Check Valves, Flanged
5. MSS SP-72: Ball Valves with Flanged or Butt-Welding Ends for General Service
6. MSS SP-78: Cast Iron Plug Valves, Flanged and Threaded Ends
7. MSS SP-80: Bronze Gate, Glove Angle and Check Valves
8. MSS SP-84: Steel Valves - Socket Welding and Threaded Ends
9. MSS SP-85: Cast Iron Globe and Angle Valves, Flanged with Threaded Ends
10. MSS SP-92: MSS Valve User Guide
C. QUALIFICATIONS OF WATER TREATMENT SERVICE PROVIDER
1. The Water Treatment Service Provider must provide water treatment programs to and actively serve a clientele in the MA area. The Water Treatment Service Provider shall be familiar with, experienced in, and regularly engage in the design, manufacture, application, and service of closed water glycol systems, closed loops and cooling towers. They shall have at least (5) years' experience in areas that include training, testing, and troubleshooting such systems.
2. The Water Treatment Service Provider shall provide references of at least three (3) organizations that it has provided similar services for.
3. The Water Treatment Service Provider must have at least five (5) current or past treatment programs using chemicals and services similar to those offered under this proposal and functioning with a makeup water chemistry similar to that available to the Cambridge, MA area within the last five (5) years. The Water Treatment Service Provider must be presently operating in facilities like the one at the City of Cambridge or similar facilities within the United States. Documentation shall be made available upon request.
4. The Water Treatment facility shall include individuals who can not only fulfill various ordering and delivery requirements but who can also troubleshoot water and equipment problems and provide technical solutions. The individual assigned to service the program herein proposed must have documentable experience of at least five (5) years in similar water treatment service work plus evidence of at least five (5) years tenure in the same geographical area and with the same client accounts. An individual with a Certified Water Technologist certification or equivalent experience is required. This individual must also be supported by a staff of senior engineering experts and a well-equipped corporate laboratory capable of performing special analyses on corrosion coupons, deposits, microbiological samples, and other critical water treatment parameters. Documentation shall be made available upon request.
D. QUALITY ASSURANCE
1. HVAC Water Treatment Service Provider Qualifications: An experienced HVAC Water Treatment Service Provider with a “CWT” designation as offered by the Association of Water Technologies shall be required for this project. The Water Treatment Service Provider must be capable of analyzing water qualities, installing water treatment equipment, and applying water treatment as specified in this Section.
2. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.
1.07 Accessibility
A. Install equipment and materials to provide required access for service and maintenance. Coordinate the final location of concealed equipment and devices requiring access with final location of required access panels and doors. Allow ample space for removal of all parts that require replacement or service.
1.08 Installation
A. Coordinate mechanical equipment and materials installation with other building components.
B. Install equipment and materials to facilitate maintenance and repair or replacement of equipment components. As much as practical, connect equipment for ease of disconnecting, with minimal interference with other installations.
1.09 Submittals
A. Refer to Section 013300 for submittal definitions, requirements, and procedures. The following paragraphs supplement the requirements of Section 013300
B. Submittal of Shop Drawings, product data, and samples will be accepted only when submitted by the General Contractor. Data submitted by Sub-contractors and material suppliers directly to the Architect/Engineer will not be processed.
C. Provide submittals for the following equipment relevant to the testing and treatment of systems:
1. Valves
2. Meters and Gages
3. Hangers and Attachments
4. Mechanical Identification
5. Mechanical Insulation
6. Hydronic Piping
7. Pumps
8. Chemical test equipment.
9. Chemicals – Product Data Bulletins
10. Chemical bypass feeders.
11. Corrosion Coupon Racks.
12. Water Meter
13. Chemical safety data sheets.
14. Certification of Water Treatment Qualifications as specified in Quality Control Section.
15. Documentation of Experience as listed in Section C
16. Documentation of CWT Certification as listed in Section C
17. List of other accounts served in the Cambridge Area
18. Chemical test equipment Product Data Bulletins
19. All chemicals that will be utilized (Hydrotesting, Pre-cleaning, Passivation) – SDS’s and Product Data Bulletins which must include feed rates for this project.
20. Chemical bypass feeders - Product Data Bulletins
21. All Chemical Feed Equipment - Product Data Bulletins
22. Glycol feed units - Product Data Bulletins
23. All chemicals that will be utilized for operational treatment – SDS’s and Product Data Bulletins which must include feed rates for this project.
24. Calculations for use amount including all projected water use rates and chemical usage.
25. Wiring Diagrams for all control equipment - Detail power and control wiring and differentiate between manufacturer - installed and field installed wiring.
26. Flow Diagrams for all control equipment and valve package installation of equipment especially those that differentiate between manufacturer - installed and field installed.
27. Water Treatment Protocols: Written sequence of protocols to be established for hydrotesting, pre-cleaning and flushing of the piping and equipment.
28. Water Treatment Protocols: Written sequence of protocols to be established for normal operational parameters, also for shutdown and start-up.
29. Water Analysis and Formal Reports: See Section G – Examples of these documents must be supplied with the bid.
D. Wiring Diagrams: Detail power and control wiring and differentiate between manufacturer- installed and field-installed wiring.
E. Water Analysis Provider Qualifications: Verification of experience and capability of HVAC water treatment service provider. Including CWT Certificate and Valid State Pesticide License.
F. Water Treatment Program: Written sequence of operation on an annual basis for the application equipment required to achieve water quality defined in "Performance Requirements" article.
G. Water Analysis and Formal Reports: Refer to the "Performance Requirements" article in this section for water analysis and formal report requirements.
H. Field Test Reports: Indicate and interpret test results for compliance with performance requirements.
I. Operation and Maintenance Data: For sensors, injection pumps, filters, system controls, and accessories to include in emergency, operation, and maintenance manuals.
1.10 Substitutions
A. If materials or equipment are substituted for specified items that alter the systems shown or its physical characteristics, or which have different operating characteristics, clearly note the alterations or differences and call it to the attention of the a/e. Under no circumstances shall substitutions be made unless material or equipment has been successfully operated for at least five consecutive years.
1.11 Product Listing
A. Prepare listing of equipment and materials for the project.
B. Provide all necessary information.
C. If work is performed by trade contractors through a separate procurement by Owner, be advised that when two or more items of same material or equipment are required, they shall be of the same manufacturer. Product manufacturer uniformity does not apply to raw materials, bulk materials, pipe, tube, fittings (except flanged and grooved types), sheet metal, wire, steel bar stock, welding rods, solder, fasteners, motors for dissimilar equipment units, and similar items used in work, except as otherwise indicated.
D. Provide products which are compatible within systems and other connected items.
1.12 Delivery, Storage and Handling
A. Deliver products to site properly identified with names, model numbers, types, grades, compliance labels, and similar information needed for distinct identifications; adequately packaged and protected to prevent damage during shipment, storage, and handling.
B. Protect stored equipment and materials from damage.
C. Coordinate deliveries with Owner’s designated staff. Limit each shipment of materials and equipment to the items and quantities needed for the smooth and efficient flow of operations.
1.13 Warranties
A. The Contractor shall provide a one (1) year minimum warrantee on all products (unless otherwise stated in the product specification for a specific product) and labor for work under this section.
1.14 Commissioning
A. The Water Treatment Service Provider shall include all costs associated with on-site manufacturers/engineer commissioning and start-up of the following systems:
1. BMS System Integration (Where Applicable)
2. Chemical Treatment
3. RO Water System (Where Applicable)
4. Water Softener System (Where Applicable)
B. System commissioning by Vendor, shall verify that all installed equipment, systems and components function individually and together as a complete system as indicated by design document and manufacturers requirements.
The Contractor is not responsible for the repair/replacement of water softener or RO equipment. The Contractor is responsible for maintaining required salt levels, filter changes, resin, and membrane, and/or any other manufacturer’s/industry standard recommendations for maintenance.
1.15 Hoisting Equipment and Machinery
A. Unless otherwise specified, all hoisting and rigging equipment and machinery required for the proper and expeditious prosecution and progress of the Work of this Section shall be furnished, installed, operated and maintained in safe condition by Water Treatment Service Provider.
1.16 Estimating the Volume of Water Systems
A. Conversion Factors:
1. 1kW : 3,421 BTUs
B. The following guide to estimating system volumes has been developed from field experience over many years. Multiply the boiler output rating in kWs by the figure given below for the relevant type of system to give an estimate of the total system volume
1. Commercial Systems (pressurized):
Systems comprised of perimeter heating, convectors, etc.: 1.6 gall/kW b
Ventilation system (air handling units, fan coil, etc): 2 gal/kW c
Steel panel radiators: 3 gal/kW d
Cast iron radiators: 3.7 gal/kW
2. Example:
140,000 BTU Boiler with Perimeter heating: 140,000 BTU ÷ 3,412 BTU = 41 kW. System size = 41 kW x 1.6 gal/kW = 65.6 gallons
2.01 Water Treatment Systems
A. SUMMARY
1. The Water treatment maintenance services shall be comprehensive in nature. The intent of the water treatment services shall be to:
a. Maintain clean water systems, free of harmful growths or bacteria, especially pathogens and other bacteria that can inhibit proper heat transfer, cause disease or enhance corrosion.
b. Prevent excessive corrosion of piping and all equipment.
c. Maintain pH, dissolved solids, and particulate at optimum levels.
d. Prevent deposit or scale buildup on heat transfer surfaces.
e. Maintain low chloride levels in the cold water make up for cooling towers
2. The Water Treatment Service Provider shall provide all testing, chemicals, control equipment, chemical feed pumps, monitoring equipment, service/labor, and expertise to meet these objectives.
3. The systems to receive water treatment service are as detailed below:
a. Chilled Water
1) Chilled Loop - Estimated Size [3,000] gallons
b. Heating Hot Water
1) Heating Hot Water Loop - Estimated Size [2,500] gallons with several hot water heat exchangers and boilers.
c. Open Recirculating - Cooling Tower Water – Condenser Loop
d. Cold Water make up to cooling towers (R.O. and Water Softener Systems) – Where applicable.
e. Glycol Systems
f. Glycol water systems
h. Closed-loop water source heat-pump
i. Driveway Snow-melt Systems
4. This section includes the following water treatment and equipment for system indicated on Appendix A:
a. Manual and automatic chemical feed equipment.
b. Hydrotesting chemicals
c. Cleaning chemicals
d. Passivation chemicals
e. Chemical treatment test equipment.
f. Cooling Tower Water Inhibitors
g. Cooling Tower Water Biocides
h. Chilled Water Corrosion and Biocide Treatments
i. Heating Hot Water Corrosion and Biocide Treatments j. Glycol/water corrosion and Biocide Treatments
k. Services to be provided.
l. RO water make up (where applicable)
m. City water make up
n. Conductivity Sensor and associated control valves o. Biocide Treatments
p. Services to be provided.
B. PERFORMANCE REQUIREMENTS
1. Water quality for HVAC systems shall minimize corrosion, scale build-up, general particulate fouling and biological growth to allow for optimum efficiency of the HVAC equipment without creating a hazard to operating personnel or the environment. The systems will be chemically treated to prevent such occurrences. No chromates or other regulatory (State, Local or Municipal) forbidden chemicals shall be utilized.
2. Hydrotesting, cleaning and flushing of all the reconstructed systems in this contract are to be done by the Mechanical Contractor with oversight from the Water Treatment Service Provider. The Water Treatment Service Provider is responsible for determining the compatibility of the chemicals that will be utilized with all the metallurgies involved.
3. The HVAC water treatment should be based on the quality of water available at the project site, HVAC system equipment material characteristics, metallurgies involved and functional performance characteristics, operating personnel capabilities, and requirements and guidelines of authorities having jurisdiction. A report documenting that the Water Treatment Service Provider analyzed the incoming project site water, and describing its characteristics, shall be supplied to the General Contractor, Project Engineer and the Facility Maintenance Department. The testing must include: date sample was taken, date sample was analyzed for P&M alkalinity, calcium, magnesium, total hardness, pH, conductivity, chlorides, sodium, sulfate, zinc, potassium, silica, iron, copper, barium, aluminum, manganese, strontium, ortho-phosphate, poly-Phosphate and nitrates.
4. The systems shall not be hydrotested without a chemical additive being added to the make-up water. The chemical additive shall include a Vapor Phase corrosion additive to prevent flash rusting when the system is drained. The hydrotesting must be overseen by the water treatment service provider to prevent excessive corrosion.
5. The pre-cleaning and flushing of the systems must be done with the oversight of the Water Treatment Service Provider. It must also be documented in a formal report supplied to the general contractor and project engineer, including the steps taken during pre-cleaning and flushing. Water analyses must be done as listed above and to be precleaned and flushed during every phase done during each of the steps and a final flushing water quality analysis with particle size distribution analyses conducted on the final flush water. (Note: For the glycol systems the final flush water must be deionized water because complete draining of a closed loop is almost impossible. The final concentration of the glycol must be +/- 1% of the percentage listed for the loop. When filling with glycol an estimate of the interstitial remaining water must be considered and thus the concentration of the glycol used to fill the system will have to be higher than the concentration demanded.)
6. The passivation of the systems must be done with the oversight of the Water Treatment Service Provider. It must also be documented in a formal report supplied to the general contractor and project engineer, including the steps taken during the passivation, especially if a galvanized or aluminum metallurgy is utilized. Passivation of these metallurgies is extremely important and under no circumstances should damage to these metallurgies be allowed. If there is an issue with timing and passivation, the water treatment service provider will provide documentation to the General Contractor, Project Engineer and the Manager of Facilities. discussing the facts and the issues before he continues. Water analyses must be done on every system and must be done during every phase done during each of the steps of passivation. For the cooling tower, pictures need to be taken during each of the steps to verify conformance.
7. A formal report should also document the quality of the treated systems. The quality of the treated water must meet the specifications, if there are any, set forth by the HVAC equipment manufacturers. If no such specifications exist for the equipment, a full analysis must be done. This analysis must also include inhibitor levels and particle size distribution analysis, that documents the quality of the water/fluid. If glycol is required in the project, the full analysis must include organic acidity, glycol degradation products, corrosion inhibitors, scale promoters, contaminants, corrosion by-products and general qualities of the glycol including concentration, type and freeze point.
8. Water Testing that must be done on all samples for the precleaning and flushing stages:
P & M Alaklinity (as CaCO3) |
Zinc (as Zn) |
Chlorides (as NaCl) |
Silica (as Si) |
Calcium (as Ca) |
Aluminum (as Al) |
Magnesium (as Mg) |
Total Iron (as Fe) |
Total Hardness (as CaCO3) |
Dissolved Iron (as Fe) |
pH |
Total Copper (as Cu) |
Conductivity |
Dissolved Copper (as Cu) |
Sodium (as Na) |
Manganese (as Mn) |
Potassium (as K) |
Ortho – Phosphate |
Sulfate (as SO4) |
Poly - Phosphate |
Oil and Grease |
MBAS (Surfactants) |
Total Organic Carbon |
Suspended Solids |
The stages that analyses are required are:
• Before Cleaner is added
• After Cleaning
• After Flushing ( must include Particle Size Distribution Analysis)
• After Passivation ( must include Particle Size Distribution and Inhibitor Levels)
9. The Water Treatment Service Provider shall supply standard ASTM D2688 Method B corrosion coupons in carbon steel (C1010), copper (CDA110), Galvanized Steel and other metallurgies in the systems for installation in coupon holders to be placed in the systems. The Service Provider will conduct the testing by installing the coupons in the coupon holders and supplying all coupon racks. (Note: Coupons are not to be pre passivated). These coupons will be reweighed by the supplier company and examined by them after exposure for weight loss, deposit accumulation, deposit analysis (where appropriate) and general appearance. A written report with photographs (before and after cleaning) of the results of this examination will be submitted to the General Contractor, Project Engineer and the Facilities Manager of City of Cambridge within two weeks of coupon removal. Coupons will be installed in various systems to establish a historical database. Priority will be given to systems where there is a suspicion or evidence of a corrosion problem but in no case in less than the following systems:
• Four sets per year in all glycol systems.
• Nine sets per year in all cooling tower water systems.
• Four sets per year in all chilled and hot water systems.
• Four sets per year in all glycol systems.
In no case shall coupons be exposed for longer than a 90-day period. The treatment program shall be designed to maintain for the corrosion rates as listed in the table below:
System Type |
Carbon Steel (C1010 |
Copper (CDA110) |
Glycol Closed Loop |
Less than or equal to 0.2 mpy |
Less than or equal to 0.1 mpy |
Chilled Closed Loop |
Less than or equal to 0.2 mpy |
Less than or equal to 0.1 mpy |
Cooling Tower or Open Recirculation System |
Less than or equal to 2.5 mpy |
Less than or equal to 0.2 mpy |
Hot Water Closed Loop |
Less than or equal to 0.2 mpy |
Less than or equal to 0.1 mpy |
Geothermal Closed Loop |
HDPE Pipe (N/A) |
HDPE Pipe (N/A) |
Note: These rates assume that the metal loss is uniform with no pitting or localized attack including gouging, etching, microbial attack or crevice attack. Conditions such as those are not acceptable. If they are noted, the cause should be addressed with follow-up testing to confirm improvement. Localized attack at the coupon holder may be ignored if the treatment is unable to interact with the coupon in this area and no other abnormalities are noted.
10. The Water Treatment Service Provider will perform monthly water analyses based on the tables below. From these analyses the Water Treatment Service Provider will properly assess the performance of the complete water treatment program. A monthly formal report will be issued to the General Contractor, the Project Engineer and the Manager of Facilities.
Table of Monthly Testing Required | |||
Tests |
All Condenser Waters |
Chilled Water & Hot Water Systems |
City Water |
P Alkalinity |
X |
|
X |
M Alkalinity |
X |
|
X |
Chloride |
X |
X |
X |
Calcium Hardness |
X |
|
X |
Total Hardness |
X |
X |
X |
pH |
X |
X |
X |
Dissolved Iron |
X |
X |
X |
Conductivity |
X |
X |
X |
Silica |
X |
|
X |
Dissolved Copper |
X |
X |
|
Ortho-Phosphate |
X |
|
X |
Poly-Phosphate |
X (if used as inhibitor) |
|
|
Phosphonate |
X |
|
|
Zinc |
X |
|
|
Inhibitor Concentration including azole |
X |
X |
|
Total Bacteria – Plate Count |
X |
X |
|
Total Fungal Count |
X |
X |
|
Total Slime Formers |
X |
X |
|
Sulfate Reducing Bacteria |
X |
X |
|
Iron Reducing Bacteria |
X |
X |
|
Denitrifying Bacteria |
|
X |
|
Table of Bi-Monthly On-site Testing Required | ||||
Tests |
Glycol Loops |
Tests |
Glycol Loops |
|
Concentration of Glycol |
X |
Iron |
X | |
Freeze Point |
X |
Copper |
X | |
Burst Point |
X |
|
| |
pH |
X |
|
| |
Conductivity |
X |
|
| |
Inhibitors |
X |
|
| |
11. Microbiological population/growth analyses shall be conducted on condenser and chilled bulk waters monthly, using dip stick methods, petri-film or ATP or by the corporate support laboratory, using incubated culture methods. A minimum of one such sample per month will be run for each operating cooling tower with additional tests as required where it is suspected that problems or upset conditions exist. All results shall be submitted in writing within fifteen (15) days of the test. Whenever excessive microbiological growth is suspected in a system because of a cooling tower inspection, deposit analysis, or examination of corrosion coupons, the Water Treatment Provider shall increase biocide feed and conduct analyses of the system for microbiological growth twice a month. For field testing and immediate results, dipstick, petri-film and ATP analysis will all be acceptable, but these results must be supported by a detailed analysis in the corporate support laboratory. Each test must be run on a sample drawn from the same location, under the same operating conditions, and at the same time following biocide application. Total microbiological population shall be maintained at 1,000 organisms per milliliter or less. Total fungal populations shall be maintained at non- detectable. SRB and IRB, along with other corrosion causing bacteria, shall also be maintained at non-detectable levels. A formal report issued to the General Contractor and the Project Engineer should provide evidence of this upon every service visit. If bacteria are above these levels in these systems the Water Treatment provider will provide extra biocide to control these bacteria at no extra cost.
12. Microbiological population/growth analyses shall also be conducted on screen coupons placed in corrosion coupon racks to monitor slime or sessile bacterial growth in the condenser and chilled bulk waters monthly, using dipstick methods, or by the corporate support laboratory, using incubated culture methods. A minimum of one such sample per month will be run for each operating cooling tower with additional tests as required where it is suspected that problems or upset conditions exist. All results shall be submitted in writing within fifteen (15) days of the test. Total microbiological population shall be maintained at 1,000 organisms per milliliter or less. Total fungal populations shall be maintained at non-detectable. SRB and other corrosion causing bacteria shall also be maintained at non-detectable levels. A formal report issued to the General Contractor and the Project Engineer should provide evidence of this upon every service visit. If bacteria are above these levels in these systems the Water Treatment provider will provide extra biocide to control these bacteria at no extra cost.
13. Legionella testing analyses shall be conducted on all condenser waters at least four times per year to verify Legionella bacterium are under control. All results shall be submitted in writing within 20 days of the test. If Legionella bacteria are found and they are Serogroup 1 thru 6, the Water Treatment Provider will take immediate actions to reduce the legionella bacteria levels. Discussions should be held immediately upon notification by the laboratory with the City of Cambridge, Project Engineer and General Contractor as to what the plan of action will be. Note: The charges for any other chemicals or testing will be the sole responsibility of the Water Treatment Provider. A formal report issued to the General Contractor and the Project Engineer should provide evidence of this requirement.
14. The Water Treatment Provider will also provide and change all bag filters in the closed loop filter/feeders that are installed on the closed loops. If a closed loop does not have a filter/feeder, the Water Treatment provider will propose supply and installation, separately from this bid.
15. The Water Treatment Provider will also test and check the sand filters on the condenser water systems once a month for proper operation and bacterial growth. Once a quarter they will also conduct a particle size distribution analysis before and after the filter and bacteria counts.
16. The Water Treatment Provider will also provide a sanitization of the condenser water systems and cooling towers at most twice per year prior to the City of Cambridge's
personnel's cleaning of cooling towers. This sanitization is to help prevent the City of
Cambridge personnel from contracting possible pathogens while cleaning the cooling towers. These sanitization costs are solely the responsibility of the Provider.
17. The Water Treatment Provider will also lay-up the condenser water systems and cooling towers at the end of the season or when a condenser is off-line and in the stand-by mode or out of service. Checks will be made regularly by the Provider’s service representative as to how well the lay-up is being maintained. These lay-up costs are solely the responsibility of the Provider.
18. Performance of each condenser shall be checked by performing an annual inspection of the water side conditions. This inspection should be documented by a written report, supplemented by photographs and a fiberoptic scope check of the heat exchangers and or piping. The report is to be submitted within thirty (30) days of the inspection. If any significant deposits or scale are found during these inspections, samples shall be taken for detailed chemical and deposit analysis in the corporate support laboratory. The deposits must be analyzed at minimum by SEM/EDX and three temperature loss of ignition analysis and/or other supplemental testing to verify what the deposit is. There will be no extra charge to the City of Cambridge.
19. The Water Treatment Provider must agree to haul away all used chemical drums, boxes or bags to an acceptable licensed disposal site at no additional cost to the City of Cambridge.
20. Chemical Containment - all chemicals on-site need to be stored in chemical containment so any leaks in the container get captured and not distributed onto the floor or other
areas at the City of Cambridge site. All containment must be 150% of the chemical
capacity of the drums or containers stored on them.
21. The Water Treatment Provider shall maintain an inventory of treatment chemicals at the facility, sufficient to ensure that the supply will not be exhausted before replenishment but not to exceed a 90-day supply beyond those containers presently in use. A 40-day inventory of materials must be maintained on site so that chemical treatments are always maintained in each system. Just in time inventory is not acceptable.
22. For each proposed water treatment chemical, Water Treatment Provider shall propose a dosage rate with test control ranges for the trace parameter. Using these dosages and the operating data for the system, The Provider shall provide a documented calculation of the estimated consumption of each chemical, based on yearly consumption or consumption per 1,000 gallons of system capacity or makeup rate, as appropriate. Provider shall indicate cycles of concentration in calculating consumption of all cooling water treatment chemicals. All this must be included with the Submittal and Contractor's bid package.
23. Disposal of Used Containers – Water Treatment Provider must agree to haul away all used chemical drums, boxes or bags to an acceptable licensed disposal site at no additional cost to the City of Cambridge.
24. All water treatment chemicals shall be packaged in sturdy, DOT-approved drums, carboys, or bags, palletized and delivered to the specified receiving dock. All chemicals will be distributed to different areas by the Water Treatment Provider. The City of Cambridge personnel will not move chemicals or remove empty drums from the site. This is all the responsibility of the Water Treatment Provider. Note: The City of Cambridge would prefer a drum-less operation or mini-bulk delivery program.
25. The glycol supplied for this job will be prediluted with deionized water and the inhibitor package will be one that conforms to what the major manufacturers of glycol provide. (Dow, Houghton, Interstate, Union Carbide). The inhibitor package must be one that will not cause issues with the equipment or metallurgies used in the system and must protect them from corrosion, deposition and biological growth.
C. MAINTENANCE SERVICE
1. Scope of Maintenance Service: Provide services as described above.
2. The Contractor’s service representative shall visit the complex at least once every month. The dates of the service calls will be prearranged at the convenience of the City of Cambridge personnel. During each of these visits, the representative will take and analyze samples as indicated within this specification, will visit with operators and supervisors in the complex as indicated to answer any questions and probe for incipient problems, and will examine performance check information for the monitors indicated within this specification. Results of field analyses plus a narrative report of observations, conclusions and recommendations will be submitted by a written report or computer-generated report no later than on the next day from the date of service, with any follow-up reports discussing major issues observed at the time of the service visit being issued within one week of the service visit.
3. The technical service representative shall be available by phone within an 8-hour period and should be able to be on-site or have some technical representative on-site within 24 hours of a phone call.
4. The technical service representative shall also coordinate with the City of Cambridge personnel the dates of chiller equipment, heat exchanger, cooling tower openings for inspection and/or troubleshooting services. Results of any such inspections shall be documented by written reports, deposit analyses and photographs, if appropriate.
5 At least two times a year, the Contractors’ technical service representative shall meet with City of Cambridge Supervisors and the City of Cambridge’s Consultant to review the progress of the program during the previous six months and to discuss plans for any changes or improvements in the next six months. At least one of these meetings each year should include the participation of a senior technical expert from the Contractor’s corporate engineering staff.
6. The Contractor may also be called on to work with a City of Cambridge Consulting Engineer who could request to review all the contractor’s information.
7. At least once every six months during a service visit, the Water Treatment Service Providers’ representative shall take a sample of City water makeup, from each of the condenser water systems and from each of the chilled water and hot water heating systems. Two identical samples will be taken in bottles provided by the Water Treatment Service Vendor. The second sample will be tested on the spot by the service representative but, more importantly, the first sample shall be transmitted to the Water Treatment Service Vendor. The second sample will be tested on the spot by the service representative corporate laboratory for a complete analysis. This analysis will include all the parameters the field representative has tested for and also those not able to be determined with field test kits or analyses, requiring more sensitive and precise methods, available only in the central laboratory (ex: total iron, total copper, azole concentration, polymer concentration and poly-phosphate, aluminum and barium on the city water.) The Water Treatment Service Vendor laboratory shall report results of their analysis within one month of sample submission with interpretive comments including Langelier Index, comparison with Service Representative results and cycles of concentration based on chloride or silica. These results will be reported in writing to the City of Cambridge personnel.
8. Training
a. The Water Testing service representative shall instruct, on an ongoing basis, all City of Cambridge operators in all the activities of a water tester, specifically in taking samples, running applicable control tests, interpreting test results, feeding chemicals, changing chemical feed rates, and modifications of treatment control equipment (pumps, timers, blowdown valves, interlocks, instrumentation, etc.). The instruction should also cover the purpose of each treatment chemical, its recommended control range, and actions to take should the test results be out of range, as well as the consequences of allowing the treatment to remain out of range.
b. This training can be accomplished routinely during the service representative’s monthly visits; however, at the onset of the initial contract (prior to the arrival of chemicals, set-up and installation) the Contractor must provide a training program illustrated by audio-visual training aids. The initial training program shall include, but not be limited to, the following topics:
1) Water testing procedures
2) Basic water chemistry and treatment
3) Importance of Water Treatment
4) Design and Operation of Cooling and Heating Equipment and why water treatment is important.
5) Corrosion control in cooling water systems
6) Deposit control in cooling water systems
7) Microbiological control in cooling water systems
8) Control instrumentation
9) Chemical feed equipment
10) Treatment Chemicals
11) Handling and Safety
c. A training program like this also must be done at least once per year and should include any new operators or employees dealing with the water treatment program.
d. The Water Treatment Provider shall provide instruction / operation manuals in sufficient number to provide one copy for each operator, supervisor and the City of Cambridge Consultant. These manuals shall include full descriptive information on chemical products being used, product bulletins and safety data sheets for each, procedures for all recommended water tests, control limits for the tests, and purpose of each chemical treatment. Water testing procedures and control limits should be posted separately near each water testing location.
9. Reports
In agreement with previous sections of this bid specification, the following reports shall be supplied by the Water Treatment Provider to a Chain of Command agreed upon by the City of Cambridge.
a. A handwritten or computer report summarizing results of the service representative’s monthly visits, including results of any field tests on water samples compared with recommended control ranges, usage rates of treatment chemicals, inventory control data, and a narrative interpretation of treatment control, troubleshooting observations, and suggestions for needed changes in treatment. This report shall be left at the conclusion of each service visit.
b. Computer generated reports of the results of any performance checks such as corrosion coupons, deposit analyses, or any other analyses.
c. Computer generated reports of the results of corroborative/supplementary water analyses conducted by the Contractors’ corporate laboratory.
d. Follow-up computer generated reports on all problems noted during the service visit, what caused them, and recommendations for correction.
e. Computer generated summaries of the semiannual progress meetings stating the work accomplished during the past six-month period and work to be accomplished during the subsequent six-month period plus any problems needing attention by the City of Cambridge.
f. Full engineering reports giving the results of any equipment inspection, documented by deposit analyses and photographs, if appropriate.
(NOTE: All reports will be sent to a list of individuals as specified by the City of Cambridge to verify that all pertinent personnel are aware of what is occurring with the water systems and to verify that communications were received.)
D. MANUAL AND AUTOMATIC CHEMICAL FEED EQUIPMENT
1. Closed Loops – Glycol Systems
a. Bypass Filter Feeders: Steel, with corrosion-resistant exterior coating, minimum 3-1/2-inch (89-mm) fill opening in the top, and NPS 3/4 (DN 20) bottom inlet and top side outlet. Feeder shall have a stainless steel dissolving basket that fully supports the filter bag. The filter bag shall be the 5-micron type with ring top and handle. The feeder shall have only a threaded fill cap with gasket seal and diaphragm to lock the top on the feeder when exposed to system pressure in the vessel. The filter feeder shall be similar to Neptune Model FTF-5DB.
1) Capacity: 5 gal. (19 L).
2) Working Pressure: 125 psig (860 kPa)
b. Water Meter: The water meter is to monitor any water added to the glycol system.
1) AWWA C701, turbine-type, totalization meter.
2) Body: Bronze or Stainless Steel.
3) Minimum Working-Pressure Rating: 100 psig (690 kPa).
4) Maximum Pressure Loss at Design Flow: 3 psig (20 kPa).
5) Registration: Gallons (Liters) or cubic feet (cubic meters).
6) End Connections: Threaded.
7) Control: Low-voltage signal capable of transmitting 1000 feet (305 m).
8) Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.
9) A remote reader and splitter shall be provided. Splitter shall send signal to Building Management System.
c. Four Station Corrosion Coupon Test Rack and Assembly: Constructed of corrosion resistant material and able to handle the temperatures of the system, complete with piping, valves, strainer, flow monitoring device, quick disconnect O- ring sealed coupon holders, and mild steel and copper coupons. Locate copper coupon downstream from mild steel coupon in the test coupon assembly. One corrosion coupon rack is necessary for each system in this specification.
2. Closed Loop Geothermal Chemical Treatment
a. The hot, chilled and condenser water piping systems shall be cleaned with sufficient chemicals to ensure the removal of all cutting oil, compound, etc. These chemicals shall not be harmful to the various materials of the systems. The treatment company representative shall supervise this operation including the flushing of the system and shall test the final rinsed system to ensure that the remnants of the cleaning solution do not impart alkalinity to the water in excess of 300 PPM.
b. Hot, chilled and condenser water systems shall be treated with sufficient amounts of the proper chemicals to conform to the Dianodic method for corrosion protection. Take various samples of water to assure proper level of chemical treatment
c. Pretreated water with a pH between 7.5 to 9 shall be used to fill and mix with propylene glycol to initially charge the system. Pretreated water shall be deionized water mixed with 20% propylene glycol solution.
d. Each ground source heat pump chiller shall be treated with sufficient amounts of the proper chemicals to provide positive protection against corrosion, scale formation and carry over.
e. At the end of the first year of the contract agreement, the chemical treatment company shall provide to the owner a log of type, quantity and dosage of treatment and test results of treatment performed through the first year.
f. Following the first year of service, chemical treatment company shall provide recommended maintenance and treatment schedule to owner for testing and treating the water. This schedule shall be posted in the ground source heat pump chiller room along with the testing and treatment log.
g. Upon completion of first year of service, the chemical treatment company shall instruct the owner to the owner’s responsibility to test and treat water or to contract with chemical treatment company to perform testing and treatment services.
h. Provide coupon rack for chemical treatment system.
i. All hydronic systems that are indicated in the project schedules (hot, chilled, and ground water) to have propylene glycol solution shall be provided to 20% solution by volume upon the completion of the installation work.
E. CHEMICALS
1. Chemicals shall be furnished and installed as recommended by the Water Treatment Service Provider and the equipment manufacturer. The Water Treatment Service Provider will determine if the chemicals are compatible with piping system components and connected equipment and that they can attain water quality specified in Section D.
2. Hydrotest Inhibitor: All hydrotest water shall contain a corrosion inhibitor package and biocide to protect the system from corrosion and biological growth during stagnant periods or draining. This inhibitor package must be added during all hydrotesting. The corrosion inhibitor must also include a vapor phase corrosion inhibitor in case all the system is not full. NOTE: VERIFY THAT HYDROTESTING INHIBITOR PACKAGE IS COMPATIBLE WITH THE EQUIPMENT ON THE SYSTEM. THIS MUST BE DONE BY THE WATER TREATMENT SERVICE PROVIDER.
3. System Cleaner: NOTE: VERIFY THAT SYSTEM CLEANER IS COMPATIBLE WITH THE EQUIPMENT ON THE SYSTEM (Especially if Aluminum or Galvanized are Utilized.) THIS MUST BE DONE BY THE WATER TREATMENT SERVICE PROVIDER.
4. Closed Loop Water Piping Treatment Chemicals: As recommended by the Water Treatment Service Provider and system manufacturer to reduce deposits, inhibit corrosion and control biological growth. It also must comply with the system water quality performance requirements specified in Section E. This product is for use during the normal operation of the system. NOTE: VERIFY THAT SYSTEM CORROSION INHIBITORS AND BIOCIDE ARE COMPATIBLE WITH THE EQUIPMENT ON THE SYSTEM. THIS MUST BE DONE BY THE WATER TREATMENT SERVICE PROVIDER.
5. Closed Loop (Hot or Chilled Water) Water Piping Passivation Chemicals: As recommended by the Water Treatment Service Provider and system manufacturer to reduce deposits, inhibit corrosion and control biological growth. It also must comply with the system water quality performance requirements specified in Section E. This product is for use during the time between flushing and glycol addition to keep the system from corroding and to keep bacteria from growing. NOTE: VERIFY THAT SYSTEM CORROSION INHIBITORS AND BIOCIDE ARE COMPATIBLE WITH THE EQUIPMENT ON THE SYSTEM. THIS MUST BE DONE BY THE WATER TREATMENT PROVIDER.
6. Open Recirculating Loop Water Piping Initial Corrosion Inhibitor and Scale Inhibitor and initial Passivation Chemical: As recommended by the Water Treatment Service Provider and system manufacturer to reduce deposits, inhibit scale and corrosion and prevent white rust. It also must comply with the system water quality performance requirements specified in Section E. This product is for use during the start-up phase operation and passivation of the cooling tower. NOTE: VERIFY THAT SYSTEM CORROSION INHIBITORS ARE COMPATIBLE WITH THE EQUIPMENT ON THE SYSTEM. THIS MUST BE DONE BY THE WATER TREATMENT SERVICE PROVIDER.
7. Open Recirculating Loop Water Piping Normal Operation Corrosion Inhibitor and Scale Inhibitor: As recommended by the Water Treatment Service Provider and system manufacturer to reduce deposits, inhibit scale and corrosion and prevent white rust. It also must comply with the system’s water quality performance requirements specified in Section E. This product is for use during the normal operation and passivation of the cooling tower. NOTE: VERIFY THAT SYSTEM CORROSION INHIBITORS ARE COMPATIBLE WITH THE EQUIPMENT ON THE SYSTEM. THIS MUST BE DONE BY THE WATER TREATMENT SERVICE PROVIDER.
8. Open Recirculating Loop, Non-Oxidizing Biocide: As recommended by the Water Treatment Service Provider to reduce bacterial growth. A non-oxidizer must be utilized for normal operation. It also must comply with the system’s water quality performance requirements specified in Section E. This product is for use during the normal operation of the cooling tower. NOTE: VERIFY THAT SYSTEM CORROSION INHIBITORS ARE COMPATIBLE WITH THE EQUIPMENT ON THE SYSTEM. THIS MUST BE DONE BY THE WATER TREATMENT SERVICE PROVIDER. IF THE COOLING TOWER IS GALVANIZED, WHITE RUST CANNOT BE ALLOWED TO FORM ON THE COOLING TOWER.
9. Open Recirculating Loop, Oxidizing Biocide: As recommended by the Water Treatment Service Provider to reduce bacterial growth. An oxidizer must be utilized for normal operation. It also must comply with the system water quality performance requirements specified in Section 1.5. This product is for use during the normal operation of the cooling tower. NOTE: VERIFY THAT SYSTEM CORROSION INHIBITORS ARE COMPATIBLE WITH THE EQUIPMENT ON THE SYSTEM. THIS MUST BE DONE BY THE WATER TREATMENT SERVICE PROVIDER. IF THE COOLING TOWER IS GALVANIZED, WHITE RUST CANNOT BE ALLOWED TO FORM ON THE COOLING TOWER.
10. Cold Water Makeup Tank (1000 Gallon Tank): Non-Oxidizing Biocide: As recommended by the Water Treatment Service Provider to reduce bacterial growth. A non-oxidizer must be utilized for normal operation. This product is for use during the normal operation of the cooling tower.
11. Glycol shall be a glycol hydronic fluid from a major manufacturer. (Houghton, Dow, Interstate.) It shall not be industrial grade glycol with an unknown corrosion inhibitor package or one made up from by the water treatment provider. A sample of the installed glycol will be analyzed and a report will be provided to the General Contractor, Project Engineer and the Facility Maintenance Department. The glycol type and concentrations for the various systems are listed below:
(List Systems and % Glycol and Type)
F. CHEMICAL TEST EQUIPMENT
1. The supplier will provide, at minimum, a conductivity meter, glycol refractometer, inhibitor verification test chemical reagents and equipment to verify that the various systems are in conformance with operational parameters. The Water Treatment Service Provider will select all of the testing required for this project for the facility operational staff to conduct in order to verify conformance.
G. CURRENT CITY WATER MAKE-UP WATER ANALYSIS
TEST | CITY WATER |
Alkalinity, P (ppm as CaCO3) | 50 |
Alkalinity, total (ppm as CaCO3) | 9.27 |
pH | 7 – 10 |
Conductivity (as umho/cm) | 945.0 |
Hardness, calcium (ppm as CaCO3) | 50 |
Hardness, magnesium (ppm as CaCO3) |
30 |
Hardness, total (ppm as CaCO3) | 80 |
Chloride (ppm as Cl) | 300 |
Copper (ppm as Cu) | 0.00 |
Iron (ppm as Fe) | 0.13 |
3.01 Installation of Water Treatment
A. INSPECTION
1. General: Examine areas and conditions under which treatment systems are to be installed. Do not proceed with work until unsatisfactory conditions have been corrected in manner acceptable to Installer. Refer to water treatment section for requirements and further information.
B. INSTALLATION OF WATER TREATMENT SYSTEM
1. WATER ANALYSIS
a. Perform an analysis of supply water to determine quality of water available at the Project site and to determine the type and quantities of chemicals needed to maintain the water quality as specified in "Performance Requirements" article of each closed loop system on the project.
b. Prepare and submit documented reports to the Owner as specified in "Performance Requirements" article in this Section.
2. INSTALLATION
a. Install chemical application equipment on existing concrete bases, level and plumb. Maintain manufacturer's recommended clearances. Arrange units so controls and devices that require servicing are accessible. Anchor chemical feed tanks and floor-mounting accessories to substrate.
b. For each system included in this specification, a water meter shall be used the first time it is filled to determine the exact volume, in gallons, that the system holds. All hydrostatic test water shall contain a corrosion inhibitor and biological treatment to protect the system from corrosion, flash rusting and biological growth during stagnant periods or draining. The volume of each system shall be recorded and provided to the Water Treatment Service Provider, the Architect and the Engineer. In addition, the volume of each system shall be recorded and included in the Operating and Maintenance Manuals.
C. Mount sensors and injectors in piping circuits.
D. CHEMICAL TREATMENT OF SYSTEMS
1. System Cleaner: Provide system cleaner for the following systems:
2. List:
a. Hot water closed loop systems for the project
b. Chilled water closed loop system for the project.
E. START-UP
1. Start-up Procedures: During condenser cooling water system start-up, operate condenser water treatment system after charging with specified chemicals to maintain required steady-state characteristics of cooling water.
F. DEMONSTRATION
1. Train Owner's maintenance personnel to adjust, operate, and maintain HVAC water treatment systems and equipment. Include the following in the training:
a. Review procedures and schedules for starting and stopping, troubleshooting, servicing, and maintaining equipment and closed water systems.
b. Review manufacturer's safety data sheets for handling of chemicals.
c. Review data in maintenance manuals, especially data on recommended parts inventory and supply sources and on availability of parts and service.
2. Schedule at least four (4) hours of training with Owner, through the Architect, with at least seven days' advance notice.
Computerized Tracking System:
At the City’s Discretion, the Contractor may be required to use the City’s web-based Computerized Maintenance Management Software to track all work, including service requests and preventative maintenance. This includes status updates and completion of work.
Glycol Maintenance:
The successful bidder shall verify existing system glycol concentrations.
At all buildings, including those believed to contain glycol presently, the successful bidder shall provide preblended glycol at all hot water and chilled water loops, and closed loop geothermal systems as noted in Appendix A; assume preblended glycol concentrate to be:
a. hot water system: 35% Glycol,
b. chilled water system: 35% Glycol
c. closed loop geothermal system: 20% Glycol
Estimated system sizes have been provided based on building square footage. Bidder shall include cost for 20% additional volume in gallons for each building and system type; see Appendix A: Water Treatment and System Capacity (estimated Gallons) By Building.
For all buildings provide preblended glycol at all hot water systems, chilled water systems, and geothermal systems; see Appendix A: Water Treatment and System Capacity (estimated Gallons) By Building for system capacities for concentrations by system. Include 20% additional volume in gallons for each building and system type.
Please select one
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The Vendor/Contractor certifies that it has not been and currently is not debarred or suspended by any federal, state, or municipal governmental agency under G. L. c. 29, § 29F or other applicable law, nor will it contract with a debarred or suspended subcontractor on any public contract.
An unchecked response, a failure to respond, or a failure to meet to any of the following Quality Requirements will result in a rejection of your bid. Please check each of the following Quality Requirements as confirmations.
Bidder affirms that it has the capability to deliver the products and services that meet the full specifications in the above invitation to bid.
Bidder shall provide any and all documentation referenced in the Scope of Services upon request in a timely manner.
The individual assigned to service the program herein proposed must have documentable experience of at least five (5) years in similar water treatment service work.
Bidder has at least five (5) years of experience in the design, manufacture, application, and service of closed water glycol systems, closed loops and cooling towers and is able to provide training, testing, and troubleshooting for such systems.
Bidder has at least five (5) current or past treatment programs using chemicals and services similar to those offered under this proposal and functioning with a makeup water chemistry similar to that available to the Cambridge, MA area within the last five (5) years.
Bidders shall submit a list of three references for which the bidder has supplied similar services. References shall include contact information including contact name, addresses and telephone numbers for each to inquire as to their satisfaction with the bidders’ product and service. In addition, the City reserves the right to use itself as a reference, to contact references not listed and to otherwise perform its own due diligence when making a responsibility determination. A bid maybe rejected on the basis of one or more references reporting less than excellent past performance.
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Please electronically sign and upload the following documents using this URL: https://cambridgema.na4.adobesign.com/public/esignWidget?wid=CBFCIBAA3AAABLblqZhCD4UnZSN3XyfqZi9ZxGyvlhSnIlYThymiofiiHN4CtIXU4t2tYM27cVaMk7bVx6AI*
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