size and of the required number, in accordance with ASME BPVC SEC IV, shall
be installed so that the discharge will be through piping extended [to the
blowoff tank] [to a location as indicated]. [Each discharge pipe for steam
service shall be provided with a drip pan elbow to prevent accumulation of
water on the valve. A slip joint shall be provided between drip pan elbow
and riser.] [Each discharge pipe for hot water service shall be pitched
away from the valve seat.]
2.11.19
Strainers
Basket and "Y" type strainers shall be the same size as the pipelines in
which they are installed. The strainer bodies shall be heavy and durable,
fabricated of cast iron, and shall have bottoms drilled and tapped with a
gate valve attached for blowdown purposes. Strainers shall be designed for
[_____] kPa ([_____] psig) [_____] psig service and [_____] degrees C
degrees F. The bodies shall have arrows clearly cast on the sides
indicating the direction of flow. Each strainer shall be equipped with an
easily removable cover and sediment screen. The screen shall be made of
0.795 mm 22 gauge thick [brass sheet] [monel] [corrosion-resistant steel]
with small perforations numbering not less than 620,000 per square m 400
per square inch to provide a net free area through the basket of at least
3.30 times that of the entering pipe. The flow shall be into the screen
and out through the perforations.
2.11.20
Pressure Gauges
Gauges shall conform to ASME B40.100 and shall be provided with throttling
type needle valve or a pulsation dampener and shutoff valve. Minimum dial
size shall be 90 mm 3-1/2 inches. A pressure gauge shall be provided for
each boiler in a visible location on the boiler. Pressure gauges shall be
provided with readings in Kpa and psi. Pressure gauges shall have an
indicating pressure range that is related to the operating pressure of the
fluid in accordance with the following table:
Operating Pressure (kPA)
Pressure Range (kPA)
519-1030
0-1400
105-518
0-690
14-104
0-210 (retard)
Operating Pressure (psi)
Pressure Range (psi)
76-150
0-200
16-75
0-100
2-15
0-30 (retard)
2.11.21
Thermometers
Thermometers shall be provided with wells and separable corrosion-resistant
steel sockets. Mercury shall not be used in thermometers. Thermometers
for [inlet water and outlet water for each hot water boiler] [the feedwater
for each steam boiler] shall be provided in a visible location on the
boiler. Thermometers shall have brass, malleable iron, or aluminum alloy
case and frame, clear protective face, permanently stabilized glass tube
with indicating-fluid column, white face, black numbers, and a minimum 225
mm 9 inch scale. The operating range of the thermometers shall be 0-100
degrees C 32 - 212 degrees F. The thermometers shall be provided with
readings in degrees C and F.
SECTION 15569A
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