concentric, paddle type, designed for flange taps.
Minimum straight pipe
runs shall be in accordance with AGA XR0104.
2.5.6
Pressure Gauges
Heavy-duty industrial type pressure gauges with phenolic case, solid front,
rear blowout, threaded ring, shatterproof glass, and 13 mm 1/2 inch NPT
bottom connection shall be installed for proper operation. Pressure gauges
shall be stainless steel Bourdon spring-type with 114 mm 4-1/2 inch dial
sizes. Each gauge shall be installed where it is clearly visible from the
operating level, and all requisite piping and gauge cocks described, or
required above, shall be provided. Pressure gauges on high temperature
service shall be provided with pigtail siphons. All gauges located on pump
discharge lines shall be provided with pulsation dampeners or snubbers.
Gauge ranges shall be selected so that at normal operation the pointer
shall be approximately 50 percent of range. Gauges shall be supplied for
the following services:
Expansion Tank
Dump Tank
Master Control Center
Circulation Pump Panel
Distribution System Mains
Master Control Panel
Makeup Pumps
Emergency Feed Pump
Water Main
Chemical Feed Pumps
Fuel Oil Supply Header
Generator Pressure
HTW Water Inlet and
Outlet Duplex
2.5.7
Dial Indicating Thermometers
Thermometers shall be bimetallic type with stainless steel case and stem,
and shall be provided with thermowells. Thermometers shall have a 127.0 mm
5 inch dial and plus or minus 1 percent accuracy.
2.5.7.1
Expansion Tank and Dump Tank Thermometers
Three thermometers shall be installed on each tank. The thermometers shall
be installed at the drum centerline, at the top 1/3 point, and at the lower
1/3 point of the drum.
2.5.7.2
Inlet and Outlet Gauges of HTW Generators
Inlet and outlet gauges of HTW generators shall be as above, as applicable.
2.5.8
Remote Reading Temperature Indicators
2.5.8.1
Pump Thermometers
HTW generator and distribution system circulation pump panel thermometers
shall be dial type, liquid filled, surface panel mounting, back-connected,
150 mm 6 inch turret type phenolic case, range 35 to 260 degrees C 100 to
500 degrees F, with self-compensating stainless steel 3 m 10 foot long
capillary having a stainless steel separable socket with a 65 mm 2-1/2 inch
SECTION 15555A
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