2.4.3.1
U-bends
Provide factory-fused, injection-molded 180 degree U-bend assemblies
equipped with anti-buoyancy devices.
2.4.3.2
Threaded Transition Fittings
Provide ASTM D 2513 reinforced threaded steel-to-polyethylene fittings.
Fittings shall have a factory applied external epoxy coating.
2.5
PIPING ACCESSORIES
2.5.1
Pipe Hangers and Supports
Provide MSS SP-58 and MSS SP-69. Type 1 with adjustable type steel support
rods, except as specified or indicated otherwise. Attach to steel joists
with Type 19 or 23 clamps and retaining straps. Attach to Steel W or S
beams with Type 21, 28, 29, or 30 clamps. Attach to steel angles and
vertical web steel channels with Type 20 clamp with beam clamp channel
adapter. Attach to horizontal web steel channel and wood with drilled hole
on centerline and double nut and washer. Attach to concrete with Type 18
insert or drilled expansion anchor. Provide Type 40 insulation protection
shields for insulated piping.
2.5.2
Strainers
ASTM A 126, Class B, flanged iron body, for 65 mm 2.5 inches and larger.
ASTM B 62, cast iron or bronze for 50 mm 2 inches and smaller. Provide
basket or Y type. Tee type is acceptable for water service. Provide
screens constructed of bronze, monel metal, or 18-8 stainless steel, free
area not less than 2.5 times pipe area, with perforations as follows:
a.
80 mm 3 inches and smaller:
1.1 mm 0.045 inches diameter
perforations for liquids.
b.
100 mm 4 inches and larger:
3.2 mm 0.125 inches diameter
perforations for liquids.
**************************************************************************
NOTE: To minimize the potential for leaks, install
pressure gage taps in ground heat exchanger loop; do
not install pressure gages.
**************************************************************************
2.5.3
Pressure Gages
Provide single style pressure gage with 115 mm 4.5 inch dial, brass or
aluminum case, bronze tube, gage cock, pressure snubber, and syphon.
Provide scale range for intended service.
2.5.4
Pressure/Temperature Test Provisions
2.5.4.1
Pete's Plug
Provide 15 mm 0.5 inch MPT by 75 mm 3 inches long, brass body and cap, with
retained safety cap, nordel self-closing valve cores, permanently installed
in piping where shown, or in lieu of pressure gage test connections shown
on the drawings.
SECTION 15741N
Page 25
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