differential not in excess of the following:
Steam Working Pressure
Differential
kPa
psig
kPa psig
170-345 kPa
140 kPa
25-50 psig
20 psig
620-690 kPa
550 psig
90-100 kPa
80 kPa
2.3.6.4
Thermostatic Traps
Traps shall be installed in the return connection from each radiator. Size
and capacity of the traps shall be as indicated. Drip traps for mains,
risers, and similar live lines shall be installed with a cooling leg of 1.5
m 5 feet of bare 19 mm 3/4 inch pipe. Capacity of all traps shall be based
on a pressure differential of 20 kPa 3 psi. Traps shall be designed for a
steam working pressure of 105 kPa 15 psig, but shall operate with a supply
pressure of approximately 35 kPa 5 psig. Traps shall be of the angle
pattern with union inlet connections. Trap bodies and covers shall be
brass.
2.4
SPACE HEATING EQUIPMENT
2.4.1
Radiators and Convectors
**************************************************************************
NOTE: References to types of radiation not required
for the project shall be deleted. Indicate test
pressures desired. Drawings shall indicate types
and sizes of radiators and convectors.
**************************************************************************
Radiators and convectors shall be the types and sizes indicated. Each
radiator and convector shall be provided with a top supply and a bottom
return connection at opposite ends. Supply connection to each radiator and
convector shall contain the radiator control valve, and the return
connection shall contain the thermostatic trap. Radiators and nonferrous
convectors shall be tested hydrostatically at the factory under a pressure
of [_____] kPa psig. Cast iron convectors, after assembly, shall be tested
pneumatically under water at a pressure of not less than [_____] kPa psig.
2.4.1.1
Cast-Iron Radiators
Cast-iron radiators shall be gray cast iron, free from sandholes and other
defects. Sections shall be connected with malleable iron nipples not less
than 2.3 mm 0.09 inch thick at any point. Cast-iron radiators shall be the
legless type, wall mounted by means of hangers as specified. Adjustable
radiator hangers shall be secured to the wall and shall hold the radiators
near both ends, at both top and bottom, in such manner that the radiators
cannot be removed without the use of tools. Not less than two bolts shall
be used to secure each hanger to the wall. Necessary angles, bolts,
bearing plates, toggles, radiator grips, and other parts required for
complete installation of the radiators shall be provided.
2.4.1.2
Extended-Surface, Steel, or Nonferrous Tube-Type Radiators
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NOTE: The types of cover grille selected for
SECTION 15562A
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