VA 23 25 00-2010 HVAC WATER TREATMENT.pdf
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1、02-10 23 25 00 - 1 SECTION 23 25 00 HVAC WATER TREATMENT SPEC WRITER NOTE: 1. Delete between /-/ if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. 2. References to pressure in this section are gage pressure unless otherwi
2、se noted. PART 1 - GENERAL 1.1 DESCRIPTION A. This section specifies cleaning and treatment of circulating HVAC water systems, including the following. 1. Cleaning compounds. 2. Chemical treatment for closed loop heat transfer systems. 3. Chemical treatment for open loop systems. 4. Glycol-water hea
3、t transfer systems. 1.2 RELATED WORK A. Test requirements and instructions on use of equipment/system: Section 01 00 00, GENERAL REQUIREMENTS. B. General mechanical requirements and items, which are common to more than one section of Division 23: Section 23 05 11, COMMON WORK RESULTS FOR HVAC and ST
4、EAM GENERATION. C. Piping and valves: Section 23 21 13, HYDRONIC PIPING and Section 23 22 13, STEAM and CONDENSATE HEATING PIPING. D. /Cooling Towers/Fluid Coolers/: Section 23 65 00, COOLING TOWERS. DESIGNER NOTE: The designer shall consult with local water treatment specialists to determine the ap
5、propriate water treatment strategy for the HVAC systems included in the project. 1.3 QUALITY ASSURANCE A. Refer to paragraph, QUALITY ASSURANCE in Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION. SPEC WRITER NOTE: Evaluate the extent of technical services on a case by case basis.
6、 B. Technical Services: Provide the services of an experienced water treatment chemical engineer or technical representative to direct flushing, cleaning, pre-treatment, training, debugging, and acceptance Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
7、,-,-02-10 23 25 00 - 2 testing operations; direct and perform chemical limit control during construction period and monitor systems for a period of 12 months after acceptance, including not less than 6 service calls and written status reports. Emergency calls are not included. /During this period pe
8、rform monthly tests of the cooling tower for Legionella pneumophila and submit reports stating Legionella bacteria count per millimeter. These tests shall be conducted in a certified laboratory and not by a technician in the field./ Minimum service during construction/start-up shall be 6 hours. SPEC
9、 WRITER NOTE: Delete following paragraphs C and D when no cooling tower water treatment is required. C. Field Quality Control and Certified Laboratory Reports: During the one year guarantee period, the water treatment laboratory shall provide not less than 12 reports based on on-site periodic visits
10、, as stated in paragraph 1.3.B, sample taking and testing, and review with VA personnel, of water treatment control for the previous period. In addition to field tests, the water treatment laboratory shall provide certified laboratory test reports. These monitoring reports shall assess chemical trea
11、tment accuracy, scale formation, fouling and corrosion control, and shall contain instructions for the correction of any out-of-control condition. D. Log Forms: Provide one year supply of preprinted water treatment test log forms. E. Chemicals: Chemicals shall be non-toxic approved by local authorit
12、ies and meeting applicable EPA requirements. 1.4 SUBMITTALS A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES. B. Manufacturers Literature and Data including: 1. Cleaning compounds and recommended procedures for their use. 2. Chemical treatment for closed system
13、s, including installation and operating instructions. 3. Chemical treatment for open loop systems, including installation and operating instructions. 4. Glycol-water system materials, equipment, and installation. C. Water analysis verification. Provided by IHSNot for ResaleNo reproduction or network
14、ing permitted without license from IHS-,-,-02-10 23 25 00 - 3 D. Materials Safety Data Sheet for all proposed chemical compounds, based on U.S. Department of Labor Form No. L5B-005-4. E. Maintenance and operating instructions in accordance with Section 01 00 00, GENERAL REQUIREMENTS. 1.5 APPLICABLE
15、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): 70-2008 National Electric Code (NEC) C. American Society for Testing and
16、 Materials (ASTM): F441/F441M-02 (2008) Standard Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe, Schedules 40 and 80 PART 2 - PRODUCTS 2.1 CLEANING COMPOUNDS A. Alkaline phosphate or non-phosphate detergent/surfactant/specific to remove organic soil, hydrocarbons, flux, pipe
17、 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,
18、 STEAM and CONDENSATE HEATING PIPING, PART 3, for flushing and cleaning procedures. 2.2 CHEMICAL TREATMENT FOR CLOSED LOOP SYSTEMS A. Inhibitor: Provide sodium nitrite/borate, molybdate-based inhibitor or other approved compound suitable for make-up quality and make-up rate and which will cause or e
19、nhance bacteria/corrosion problems or mechanical seal failure due to excessive total dissolved solids. Shot feed manually. Maintain inhibitor residual as determined by water treatment laboratory, taking into consideration residual and temperature effect on pump mechanical seals. B. pH Control: Inhib
20、itor formulation shall include adequate buffer to maintain pH range of 8.0 to 10.5. C. Performance: Protect various wetted, coupled, materials of construction including ferrous, and red and yellow metals. Maintain system essentially free of scale, corrosion, and fouling. Corrosion rate of Provided b
21、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 25 00 - 4 following metals shall not exceed specified mills per year penetration; ferrous, 0-2; brass, 0-1; copper, 0-1. Inhibitor shall be stable at equipment skin surface temperatures and bulk water te
22、mperatures of not less than 121 degrees C (250 degrees F) and 52 degrees C (125 degrees Fahrenheit) respectively. Heat exchanger fouling and capacity reduction shall not exceed that allowed by fouling factor 0.0005. D. Pot Feeder: By-pass type, complete with necessary shut off valves, drain and air
23、release valves, and system connections, for introducing chemicals into system, cast iron or steel tank with funnel or large opening on top for easy chemical addition. Feeders shall be 18.9 L (five gallon) minimum capacity at 860 kPa (125 psig) minimum working pressure. DESIGNER NOTE: The designer sh
24、all increase the pump capacity by 5 percent while selecting the pump. E. Side stream Water Filter for Closed Loop Systems: Stainless steel housing, and polypropylene filter media with / polypropylene / stainless steel / core. Filter media shall be compatible with antifreeze and water treatment chemi
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