SECTION METERS AND GAUGES FOR HVAC PIPING

Transcription

1 SECTION METERS AND GAUGES FOR HVAC PIPING PART 1 - GENERAL 1.1 SUMMARY A. Work included: Provision of materials, installation and testing of: 1. Thermometers 2. Thermometer Wells 3. Differential and Filter Pressure Gauges 4. Test Plugs 1.2 RELATED SECTIONS A. Contents of Division 23, HVAC and Division 01, General Requirements apply to this Section. 1.3 REFERENCES AND STANDARDS A. References and Standards as required by Section , HVAC Basic Requirements and Division 01, General Requirements. 1.4 SUBMITTALS A. Submittals as required by Section , HVAC Basic Requirements and Division 01, General Requirements. B. In addition, provide: 1. Maintenance Materials: a. Extra gauge Oil for Inclined Manometers: One Bottle b. Extra Pressure Gauges: Two 1.5 QUALITY ASSURANCE A. Quality assurance as required by Section , HVAC Basic Requirements and Division 01, General Requirements. 1.6 WARRANTY A. Warranty of materials and workmanship as required by Section , HVAC Basic Requirements and Division 01, General Requirements. October 29,

2 PART 2 - PRODUCTS 2.1 MANUFACTURERS A. Thermometers: 1. Ashcroft 2. Trerice 3. Weiss 4. Marshaltown 5. Weksler 6. Or approved equivalent. B. Differential and Filter Pressure Gauges: 1. Dwyer 2. Or approved equivalent. 2.2 THERMOMETERS A. Thermometers - Adjustable Angle: Red-or blue-appearing organic liquid in glass: ASTM E 1; lens front tube, cast aluminum case with enamel finish, cast aluminum adjustable joint with positive locking device; adjustable 360 degrees in horizontal plane, 180 degrees in vertical plane. 1. Size: 9-inch scale. 2. Window: Acrylic. 3. Scale: Aluminum, white background, black graduations and markings. 4. Stem: 3/4-inch NPT brass (aluminum for installation in air ducts). 5. Accuracy: 2 percent, per ASTM E Calibration: with 2 Degrees F. graduations. 7. Basis of Design: Trerice BX THERMOMETER WELLS A. Description: Fitting with protective well for installation in threaded pipe fitting to hold test thermometer. 1. Material: Brass for use in copper piping. 2. Material: Stainless steel, for use in steel piping. 3. Extension Neck Length: Nominal thickness of 2-inches, but not less than thickness of insulation. Omit extension neck for wells for piping not insulated. 4. Insertion Length: To extend to center of pipe. 5. Cap: Threaded, with chain permanently fastened to socket. 6. Heat Transfer Fluid: Oil or graphite. October 29,

3 2.4 DIFFERENTIAL AND FILTER PRESSURE GAUGES A. Service: Air and non-combustible, compatible gases (Natural Gas option available.) B. Wetted Materials: Consult factory. C. Housing: Die cast aluminum case and bezel, with acrylic cover. Exterior finish is coated gray to withstand 168 hour salt spray corrosion test. D. Accuracy: Plus or minus 2 percent of full scale throughout range at 70 degrees F. E. Pressure Limits: Minus 20 Hg to 15 PSIG. F. Overpressure: Relief plug opens at approximately 25 PSIG standard gauges only. G. Temperature Limits: 20 to 140 degrees F. H. Size: 4-inch diameter dial face. I. Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientation. J. Process Connections: 1/8-inch female NPT duplicate high and low pressure taps, one pair side and one pair back. K. Standard Accessories: Two 1/8-inch NPT plugs for duplicate pressure taps, two 1/8-inch pipe thread to rubber tubing adapter and three flush mounting adapters with screws. 2.5 TEST PLUGS A. Description: Nickel-plated, brass-body test plug in NPS 1/2 (DN15) fitting. B. Body: Length as required to extend beyond insulation. C. Pressure Rating: 500 PSIG (3450 kpa) minimum. D. Core Inserts: One or two self-sealing valves, suitable for inserting 1/8-inch OD probe from dial-type thermometer or pressure gauge. E. Core Material for Air, Water, Oil and Gas: 20 to 200 degrees F (Minus 7 to plus 93 Degrees Celsius), chlorosulfonated polyethylene synthetic rubber. F. Test Plug Cap: Gasketed and threaded cap, with retention chain or strap. October 29,

4 G. Test Kit: Pressure gauge and adapter with probe, two bimetal dial thermometers, and carrying case. 1. Pressure Gauge and Thermometer Ranges: Approximately two times the system's operating conditions. PART 3 - EXECUTION 3.1 INSTALLATION A. Install thermometers in piping systems in sockets in short couplings. Enlarge pipes smaller than 2-1/2-inch for installation of thermometer sockets. Ensure sockets allow clearance from insulation. B. Where adequate space is not available, use turbine flow meters specifically designed for short pipe lengths. Use bi-directional turbine flow meters where indicated on piping diagrams. C. Install turbine and thermal energy meters in accordance with manufacturer's instructions, and as shown on drawings. Provide recommended upstream and downstream straight pipe length for accurate reading. D. Temperature Gauges: 1. Install in vertical upright position, tilted so as to be easily read at floor. 2. Thermometer Wells: Install in piping in vertical upright position. Fill well with oil or graphite, secure cup. E. Provide instruments with scale ranges selected according to service with largest appropriate scale. F. Install gauges and thermometers in locations where they are easily read from normal operating level. Install vertical to 45 degrees off vertical. G. Adjust gauges and thermometers to final angle, clean windows and lenses, and calibrate to zero. H. Locate test plugs adjacent to thermometers and thermometer sockets, adjacent to pressure gauges and pressure gauge taps, adjacent to control device sockets, or where indicated. I. Thermometer Range/Graduations: System Temperature (degree F) Graduations (degrees F) Chilled Water Heating Water October 29,

5 J. Pressure Gauge Range/Graduations: System Pressure (PSI) Graduations (PSI) Chilled Water Heating Water END OF SECTION October 29,