VA 23 25 00-2010 HVAC WATER TREATMENT.pdf

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

25、cals used in the system. Replaceable filter cartridges for sediment removal service with minimum 20 micrometer particulate at 98 percent efficiency for approximately five (5) percent of system design flow rate. Filter cartridge shall have a maximum pressure drop of 13.8 kPa (2 psig) at design flow r

26、ate when clean, and maximum pressure drop of 172 kPa (25 psig) when dirty. A constant flow rate valve shall be provided in the piping to the filter. Inlet and outlet pressure gauges shall be provided to monitor filter condition. SPEC WRITER NOTE: Provide water treatment for all condenser water syste

27、ms. The type and configuration of the system shall be based on actual water samples obtained by the local VA facility. 2.3 CHEMICAL TREATMENT FOR OPEN LOOP SYSTEM(S) A. General: Provide the following: 1. A factory-fabricated and tested packaged, self-contained, chemical feed/blow-down monitoring, co

28、ntrolling and alarming system, containing all except specified or indicated remote components, and requiring only terminal sample stream and chemical piping/tubing Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 25 00 - 5 connections, remote

29、 component electrical connection and power supply. 2. System shall be suitable for a broad spectrum make-up water supply and chemical treatment program. Components, except those specified or indicated otherwise, shall be housed in one or more joined or divided steel enclosures. B. System Functions:

30、1. Automatically maintain a predetermined, selectable, total dissolved solids concentration through a continuously monitoring conductivity controller, maintain a predetermined, selectable, scale/corrosion inhibitor and dispersant residual, through a continuously make-up monitoring meter/counter/time

31、r and inhibitor/dispersant ratio controller; achieve a predetermined, selectable, peak concentration of one or two microbiocides as needed on an alternating basis, through a programmable timer controller. De-energize controller or stagger feed chemicals that would degrade or could be incompatible if

32、 fed simultaneously. 2. Automatically maintain a predetermined, selectable, pH level through a continuously monitoring pH controller. For systems with make up water alkalinity in excess of 125 PPM or hardness above 300 PPM, provide acid feed limit timer and audible/visual alarm actuated on low pH. C

33、. Main control panel and accessories: 1. Housed in a NEMA Type 4X enclosure: a. Hinged key lock door with viewing window. b. Hard wire connected to power source. c. Provide minimum of three (3) 115V, 1 Ph, 60 Hz receptacles located on enclosure for electrical connection and control of chemical pumps

34、. d. Prewired for ease of installation. 2. Provide an external combination mounted flow switch with transparent sight tube. a. Disable control outputs upon loss of water flow to prevent chemical feeding. b. Provide complete with 3/4 IN connections and combination conductivity and temperature electro

35、de. 3. Keypad or remote control: Access all measurements and set points through chemical resistant key pad or remote. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 25 00 - 6 a. Security code to prevent unauthorized access. 4. Utilize micro

36、processor technology. 5. Menu driver programs. 6. Liquid crystal display (LCD). 7. Provide temperature corrected measurements by reading water temperature and adjusting conductivity values according to known temperature curve. a. Range: 0-100 degC (32-212 degF) with an adjustable high alarm. 8. Prov

37、ide real-time clock. 9. Conductivity monitor: a. Provide linear measurements of full range. b. Provide two scales for selection of high and low in field to assure accurate measurements. c. Provide increments of 1 microohm/cm with adjustable hysteresis. d. Provide bleed-off control in following manne

38、r: 1) Standard operation-controller actuates a bleed off solenoid valve when dissolved solids level is exceeded by trip point. 2) Provide an adjustable bleed limit timer to prevent excessive bleed off. 3) An alarm contact shall close when timer has timed out. 10. Biocide operation: a. Provide a prog

39、rammable 28 day biocide timer for accurate addition of algaecide. b. Provide a secondary bleed off timer to lower conductivity in system prior to biocide feed. c. Lock out cooling water bleed-off during biocide feed period. 11. Chemical feed control: Provide three timers that are capable of operatin

40、g in one of following field programmable modes. a. Counter-timer-chemical feed proportioned to make-up water rate. 1) Controller shall send low voltage signal to a contacting head water meter. 2) Low voltage signal will ensure long contact life. 3) Water meter shall read in gallons. 12. Alarms: a. P

41、rovide alarm LEDs with silence button for high and low conductivity, 10-60 minute bleed-off, chemical feed limit timers, and chemical drum level. Provide remote output relay to indicate Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 25 00 -

42、 7 alarm condition to Building Control System specified under Section 23 09 23, DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC. 13. Controller operating data history: a. Retain in memory all operating data for following parameters: 1) Standard memory shall allow acquisition and storage of all analog inputs

43、for a one-week period. 2) A three (3) hour minimum, maximum average of all conditions shall be stored for a one-week period. 3) A minute-by-minute account of operating conditions shall be available for latest three-hour period. 14. Electrode: Combination temperature and conductivity type. a. Quick d

44、isconnect. b. Supplied in flow switch assembly. 15. Ph monitor: a. Sensor for monitoring purposes only. b. Acid shall not be used to control pH. /16. Remote communication: Provide open protocol BACnet/IP interface to perform the following functions: a. Access Real-time system values. b. Change opera

45、ting parameters. c. Controller diagnostics. d. Obtain history files. e. Alarm condition notification./ D. Impulse water meter: 1. General: a. Measure in gallons. b. Sized to meter peak make up rates. c. Equipped with an electrical contacting register. d. Totalize flow at main control panel. 2. Provi

46、de at following locations: a. Cooling tower make up line. /b. Cooling tower bleed off line. / E. Provide CPVC injection nozzles, ASTM F441 with corporation stop to inject chemical into main circulating water line. 1. Pressure rating: 700kPa (100 PSI) 2. Size: DN20 (3/4 IN) NPT. 3. Quantity: Three (3

47、). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 23 25 00 - 8 F. Provide chemical feed pumps operated by a 115V, 60 cycle, single PH motor. 1. Provide separate stroke and stroke frequency setting capabilities. 2. Positive displacement type pu

48、mp a. Provide with anti-siphon/pressure relief valve installed on pump head which provides anti-siphon protection and aids in priming under pressure. b. Capacity: As determined by Water Treatment Vendor. c. Complete with discharge check valves, foot valves, polyethylene suction and discharge tubing.

49、 3. Quantity: Provide one pump for each chemical provided. G. Bleed-off piping assembly: 1. Inlet shut-off valve. 2. Wye strainer. 3. Strainer blowdown valve. 4. Throttling valve. 5. Brass solenoid valve compatible with main control panel. 6. Assembly shall be sized by Water Treatment Vendor. SPEC WRITER NOTE: Utilize the pallet dimensions below to determine floor space