HOT, CHILLED, AND CONDENSING WATER PIPING SPECIALTIES (HVAC)

Transcription

1 SECTION HOT, CHILLED, AND CONDENSING WATER PIPING SPECIALTIES (HVAC) PART 1 GENERAL 1.01 SUMMARY A. Related Sections: Identification HVAC Pumps Horizontal Fire Tube Boilers Unit Heaters SUBMITTALS A. Submit properly identified manufacturer's catalog cuts and technical data before starting work QUALITY ASSURANCE A. Testing: 1. Furnish pumps, gages, instruments, test equipment, and personnel required for performance of tests. Perform drainage of pipe systems and remove test equipment after testing has been successfully completed. a. Tests may be made of isolated portions of any piping system to facilitate general progress of the installation. b. Revisions made in a piping system after completion of a successful test shall require retesting of the affected portion of the piping system. c. Notification: As portions of the mechanical work are completed and readied for testing provide A/E at least 48 hours notice and perform the required tests under Contractor's supervision and in A/E's presence. d. Test piping systems, including piping fittings, accessories, and connections to hydrostatic or pneumatic pressure tests before performing painting, application of insulation, or concealment within the building. e. Test Description: 1) Subject systems to a hydrostatic or Project No. SPECIFICATION GUIDELINES

2 pneumatic test pressure of not less than 1-1/2 times operating pressure, but not less than 150 psi, for not less than 2 hours, with no fluctuation in pressure. PART 2 PRODUCTS 2.01 EQUIPMENT 1. Valves: a. Gate Valves, 2 Inches or Less: 200 pound WSP, bronze, rising stem, solid wedge disc union bonnet renewable seats, hardened seat ring, screwed. 1) Manufacturers: Crane 428, Stockham B-107, or Kennedy 425. b. Gate Valves, 2-1/2" and 3 Inches: 125 pound WSP, bronze, bolted bonnet, flanges, ANSI B ) Manufacturers: Crane 4437 or accepted c. Butterfly Valves, 4 Inches and Larger: 1) Type: Lug-wafer with the body circumference provided with lugs having tapped holes to accommodate cap-screw pipe flange bolting. 2) Body Construction Through 16 inches; Ferrosteel. 3) Lining: Rubber lined suitable for flow regulation and bubble tight shut-off service. 4) Wafer Valve: Buna-n line, or accepted 5) Operator: a) Screw type with hand wheel where valve is located less than 6 feet above finished floor. b) Chain operator assembly with indicating dial (cast-in marks on face) where valve is located six feet or more above finished floor. Crane or accepted d. Globe and Angle Valves, 2 Inches or less: 125 Project No. SPECIFICATION GUIDELINES

3 pound WSP, bronze, rising stem, plug type disc renewable seats, screwed. Manufacturers Globe Angle Crane 14-1/2P 16-1/2P Stockham B-29 B-261 Kennedy 138PS 139S e. Check Valves: 1) 2 Inches or Less: 200 psi WOG, swing type, screwed, bronze construction, Y-Pattern Crane 37, Stockham B-319, or Kennedy ) 2-1/2" and 3 Inches: 200 psi WOG, swing type, iron body, flanges, bronze trim; Crane 373, Stockham G-931, or Kennedy ) 4 Inches and Larger: 175 psi WOG, quick closing globe type with completely guided disc top and bottom to insure against cocking out of position regardless of valve position when installed, Class "B" iron body, composition bronze seats and discs, silicon bronze guide pins and bushings, stainless steel springs. 4) Manufacturer: Mueller #105AP or accepted f. Balancing Valves: B. Piping Accessories: 1. Strainers: 1) Semi-steel, non-lubricated, eccentric type bodies with resilient faced plugs suitable for operation to 250 degrees F., complete with levers. 2) Bushings: Permanently lubricated top and bottom. 3) 2 Inches or Less: Threaded ends. 4) 2-1/2" and Larger: Flanged ends. 5) Manufacturers: Desurik Series 100 and 400 or Homestead. a. Construction: Iron body, Y-type, designed for not less than 125 psi WSP, with 20 mesh monel screen with a free area not less than 2-1/2 times the cross-sectional area of the connected piping. b. Design Flow Rate: Clean strainer shall not exceed 2 psi at the design flow rate. Project No. SPECIFICATION GUIDELINES

4 c. Size: 1) 2-1/2" and Larger: Flanges. 2) 2 Inches or Less: Screwed ends. d. Drain Valve and Reducer: Furnish each strainer for use in equipment rooms and at each AHU with a drain valve and reducer to 3/4" hose thread, capped. e. Manufacturers: Crane or Mueller. 2. Air Vents: Provide accepted air vents at high points in chilled water systems, manual type unless otherwise indicated. 3. Gage Cocks: a. Screwed, bronze, tee handle. b. Manufacturers: Crane Company or Jenkins. 4. Pressure Reducing Valves: a. Brass body and brass working parts with built-in strainer, 125# S.W.P. b. Manufacturers: Bell and Gossett or Taco. 5. Water Gages: a. Polished, brass, designed for 175 pounds working pressure, with angle valves, guide rods, and drain cocks. b. Manufacturers: Crane Company #610 or Jenkins. 6. Straight Thermometers: a. Mercury filled, 9 inch scale "V" shaped, adjustable angle, separable socket well thermometers. b. Select thermometer range with operating temperature at midpoint of range. c. Manufacturers: American Instrument Company or Taylor Instrument Company. 7. Gages: a. Standard depth, cast aluminum alloy case, not less than 3-1/2" faces, with operating pressure at midpoint of range. b. Manufacturers: Ashcroft or Marshall Town. Project No. SPECIFICATION GUIDELINES

5 8. Thermometer Wells: Provide thermometer wells at thermometer locations. a. Construction: Brass, with 2 inch insulation extension neck and with cap and chain. b. Provide tees in lines 3 inches or less for thermometer wells. c. Manufacturers: Marshall Town or Ashcroft. 9. Venturi Flow Meters: a. Provide with quick disconnect valves, safety shut-off valves, and metal identification tags on chain giving pipe size, Venturi series, station identification, and meter reading at specified flow rate at locations where shown on Construction Documents. b. Sizes: 1) 2-1/2" Through 8 Inches: Plated cast iron with slip on flanges. 2) 10 Inches and Above: Fabricated steel plate with welding ends. c. Venturi Size: Same as pipe size manufacturer. d. Manufacturers: Aeroquip-Barco or accepted 10. Prohibited Fittings: Bushings, elbows, tees, and reducers fabricated from pipe and tees and elbows fabricated by butt welding branch line to main. 11. Prohibited Connections: Threaded. PART 3 EXECUTION 3.01 INSPECTION A. Do not proceed with the work of this section until conditions detrimental to the proper and timely completion of the work have been corrected in an acceptable manner INSTALLATION A. Run horizontal piping level or pitch up toward the air vent connections. Make size reduction in horizontal piping with concentric or eccentric reducing fittings, except where specifically shown or noted. Project No. SPECIFICATION GUIDELINES

6 3.03 FIELD QUALITY CONTROL A. Testing: 1. Furnish pumps, gages, instruments, test equipment, and personnel required for performance of tests, to perform drainage of pipe systems and remove test equipment after testing has been successfully been completed. a. Tests: Tests may be made of isolated portions of piping system to facilitate general progress of the installation. b. Revisions: Revisions made in the piping system after completion of a successful test shall require retesting of the affected portion of the piping system. c. Notification: As portions of the mechanical work are completed and readied for testing give the A/E at least 48 hours notice and perform the required tests in the A/E's presence and under Contractor's supervision. d. When to Perform Tests: Subject piping systems, including piping fittings and accessories, and connections to hydrostatic or pneumatic pressure tests before performing the work of painting, application of insulation or concealment within the building. e. Test Description: Subject systems to a hydrostatic or pneumatic test pressure of not less than 1-1/2 times operating pressure, but not less than 150 psi, for not less than 2 hours, with no fluctuation in the pressure ADJUSTING AND CLEANING A. Thoroughly clean hot water piping system with a solution of 1 of the following: 1. Trisodium Phosphate: 1 pound for each 50 gallons in the system. 2. Sodium Carbonate: 1 pound for each 30 gallons in the system. 3. Sodium Hydroxide: 1 pound for each 50 gallons in the system. B. Cleaning Requirements: 1. Obtain approval by A/E of proposed sampling and testing procedures before proceeding with tests. Project No. SPECIFICATION GUIDELINES

7 a. Fill and circulate each piping system tested for a period of eight hours, allowing temperatures to reach the design level for a minimum of 4 hours and then test a sample of water from the system with Hydrion paper, indicating a PH of 7 or higher. b. Add additional cleaning solution, if necessary, to obtain a PH reading of between 7 and 8. END OF SECTION Project No. SPECIFICATION GUIDELINES