Section 23 21 20 - Hydronic Specialties.doc

SECTION 23 21 20 - HYDRONIC SPECIALTIES

PART 1 - GENERAL

1.1 WORK INCLUDED

A. P.T. test plugs.

B. Pressure gauges.

C. Thermometer test wells.

D. Relief valves.

PART 2 - PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. Bell and Gossett ITT, Dieterich Standard, Flow Design, Gerand, Mueller, Peterson Engineering, Taco, Thrush, John Wood Industrial Products, Weiss Instruments, Inc.

2.2 EQUIPMENT

A. P.T. Test Plugs:

1. Provide 1/4 inch solid brass pressure/temperature test plugs at locations shown on drawings.

2. Nordel self-closing valve to be rated for 275 degrees F. service.

3. Plugs to be manufactured by Flow Design, Peterson Engineering, SISCO, or approved equal.

B. Pressure Gauges:

1. Provide 3-1/2 inch dial, liquid filled pressure gauges at locations shown on drawings.

2. Gauges to be equal to Trerice Model No. 800LF with glycerin liquid fill, nylon, steel, or aluminum case, acrylic plastic window, brass movement, phosphor bronze bourdon tube, and brass socket.

3. Accuracy to be guaranteed within one-half percent in powerhouse and mechanical rooms, other gauges shall be 2% over middle half of scale range and 3% for remainder.

4. Select scale range of gauges to indicate design pressure near midpoint of scale.

5. Provide each gauge with 1/4 inch size, brass construction needle valve equal to Trerice Model No. 735-2.

6. Provide each gauge with impulse dampener equal to Trerice Model No. 870.

C. Thermometer Wells:

1. Provide Trerice or equal stainless steel thermometer wells for water temperature sensors and at other locations shown on drawings.

2. Test wells to be stainless steel with 2-1/2 inch extension neck and screw plug cap with chain and shall be filled with light clear oil.

D. Relief Valves:

1. Provide relief valves for each hydronic system as shown on drawings.

2. Valve to be constructed to ASME code requirements, tested by National Board, and labeled with ASME symbol.

3. Valve body to be bronze construction.

4. Valves to be diaphragm type operating with slow opening and closing feature.

5. Valve to seat against face of EPDM rubber.

6. Set differential between opening and closing pressure to prevent water flash and water hammer.

7. Valve to include manual lever for testing valve.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Install hydronic specialties in strict accordance with manufacturers’ published installation instructions.

B. Provide 1/2" manual air vents at top of pipe risers and other locations where air can be trapped or collected.

C. Provide 3/4" hose end gate valve drains at bottom of pipe risers and other locations to drain water systems.

D. Pipe relief valve outlets from hydronic systems to nearest floor drain.

E. Support pump inlet and strainer fittings with floor mounted pipe and flange supports.

F. Locate thermometers and pressure gauges no higher than 7 feet above finished floor elevation.

END OF SECTION 23 21 20

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