232500 HVAC Water Treatment.pdf

Project No. 528A8-19-807 Samuel S. Stratton VAMC 02-01-20

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SECTION 23 25 00

HVAC WATER TREATMENT

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies cleaning and flushing of HVAC water systems, including the following.

1. Cleaning compounds.

B. Note that an existing water treatment supplier agreement is in place at the facility; this specification is therefore limited to cleaning and flushing requirements incumbent on the contractor.

C. All chemical treatment and injection skids are existing to remain.

D. Application of all treatment chemicals will remain the responsibility of the existing water treatment supplier.

E. Re-connections of the existing water treatment skids to the new piping, as shown on the construction drawings, is considered part of the base scope to be performed by the contractor.

1.2 RELATED WORK

A. Section 01 00 00, GENERAL REQUIREMENTS.

B. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES.

C. Section 23 05 11, COMMON WORK RESULTS FOR HVAC.

D. Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC.

E. Section 23 21 13, HYDRONIC PIPING.

1.3 QUALITY ASSURANCE

A. Refer to paragraph, QUALITY ASSURANCE in Section 23 05 11, COMMON WORK

RESULTS FOR HVAC.

B. Technical Services: Provide the services of an experienced water treatment technical representative to direct flushing and cleaning prior to putting new piping into service.

E. Any chemicals or detergents used in the flushing and cleaning process shall be non-toxic, approved by local authorities, and meeting applicable EPA requirements.

1.4 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT

DATA, and SAMPLES.

B. Manufacturer's Literature and Data including:

1. Cleaning compounds and recommended procedures for their use.

C. Flushing and Cleaning Procedures to be utilized by the contractor.

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D. Materials Safety Data Sheet for all proposed cleaning compounds, based on U.S. Department of Labor Form No. L5B-005-4.

1.5 APPLICABLE PUBLICATIONS

A. The publication listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

B. National Fire Protection Association (NFPA):

70-2020.................National Electric Code (NEC)

PART 2 - PRODUCTS

2.1 CLEANING COMPOUNDS

A. The Contractor shall provide all cleaning and flushing operations as required by the contract specifications.

B. Alkaline phosphate or non-phosphate detergent/surfactant/specific to remove organic soil, hydrocarbons, flux, pipe mill varnish, pipe compounds, iron oxide, and like deleterious substances, with or without inhibitor, suitable for system wetted metals without deleterious effects.

B. All chemicals to be acceptable for discharge to sanitary sewer.

C. Refer to Section 23 21 13, HYDRONIC PIPING and Section 23 22 13, STEAM and CONDENSATE HEATING PIPING, PART 3, for additional flushing and cleaning requirements.

2.2 CHEMICAL TREATMENT FOR CLOSED LOOP SYSTEMS

A. Coordinate with owner for scheduling of chemical treatment by existing water quality supplier currently servicing the facility.

B. Side stream Water Filter: Existing to Remain.

2.3 CHEMICAL TREATMENT FOR OPEN LOOP SYSTEM(S)

A. Coordinate with owner for scheduling of chemical treatment by existing water quality supplier currently servicing the facility.

B. Side stream Water Filter: Existing to Remain.

C. Refer to contract drawings and controls specifications for all automatic blow-down provisions.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Delivery and Storage: Deliver all detergents and cleaning chemicals in manufacturer's sealed shipping containers. Store in designated space and protect from deleterious exposure and spills.

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B. Re-Connect existing water treatment equipment originally furnished by the chemical treatment supplier to the header connections in the system as shown on the Contract Drawings. Fill hydronic systems according to the manufacturer's instructions and as may be directed by the Technical

Representative from the existing water treatment supplier, Barclay

Water Management.

D. Before adding cleaning detergents / chemicals to the closed system, all coils and heat exchangers connected to the portion of the system being cleaned should be isolated by closing the inlet and outlet valves and opening the bypass valves. This is done to prevent dirt and solids from lodging the coils.

E. Do not valve in or operate existing system pumps until after system has been cleaned.

F. After chemical / detergent cleaning is satisfactorily completed, open the inlet and outlet valves to each coil or heat exchanger and close the by-pass valves. Also, clean all side stream filters.

G. Replace all strainer baskets or screens at all existing system pumps on both the Evaporator and Condenser (Cooling Tower) sides of the system.

H. Also replace construction strainer baskets / screens with final for all new strainers provided s part of this project.

I. Document cleaning and flushing process and provide written report of flushing and cleaning work performed and results of the process in accordance with Section 01 00 00, GENERAL REQUIREMENTS.

J. After cleaning is complete, coordinate with COR to notify existing water treatment supplier that the system is ready for final treatment chemicals to be added to the system(s).

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