Plug valve 38 mm 1-1/2 inches and smaller shall be screwed.
Plug valve 50
mm 2 inches and larger shall be flanged.
2.1.20.7
Safety Relief
Safety relief valve shall be sized and constructed and shall fully comply
with requirements set forth in ASME BPVC SEC I. Safety relief valve shall
have a manual lifting device for testing.
2.1.20.8
Steam Nonreturn
Steam nonreturn valve shall be either angle type or straight type with
rising stem as shown. Steam nonreturn shall operate without chattering,
hammering, or sticking over the entire operating range of the boiler.
Valve shall comply with ASME BPVC SEC I. Steam nonreturn valve shall have
Class 300 ASTM A 216/A 216M cast steel body. Steam nonreturn shall be
bronze trim, rising stem, bolted bonnet, outside screw and yoke and flanged
ends.
2.1.20.9
Thermostatic Regulating
Thermostatic regulating valve shall be designed for a steam working
pressure of 1.03 MPa 150 psig. Thermostatic regulating valve shall be
adjustable with an operating range of approximately 54 to 88 degrees C 130
to 190 degrees F and shall maintain the desired fluid temperature within
plus or minus 2.5 degrees C 5 degrees F. Body shall be of [bronze] or
[cast] [forged] steel or stainless steel.
2.1.20.10
Ball
Ball valve shall be Teflon seated and packed. Ball valve shall provide
bubble tight shutoff. Body shall be of [bronze] or [cast] [forged] steel
or of stainless steel. Ball valve shall be two-piece full-port design.
2.1.20.11
Feedwater Control
Feedwater control valve shall be provided with the boiler. Feedwater
control valve shall be supplied with filter, regulator, supply and control
2.1.21
Water Column
Water column valve shall be constructed in accordance with ASME BPVC SEC I,
fitted with gauge glass and quick-closing gauge valves with chains and
handles for operation from the boiler room floor. [Mirror and illuminating
light shall be provided to allow water levels to be read from the boiler
room floor] [Gauge glass with illuminating light shall be provided].
2.1.22
Meters
2.1.22.1
Natural Gas Flow
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NOTE: Ensure the turndown ratio (TDR) of the
natural gas flow meter is wider than that of the
boiler burner TDR firing on natural gas.
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Natural gas flow meter shall be of the positive displacement type, provided
SECTION 15561A
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