2.16.2
Supplemental Fuel Flow Meter
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NOTE: Supplemental fuel meters should be sized on
peak requirement. Off-gas meters should be based on
blower size.
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Gas meters shall conform to [AGA B109.1] [AGA B109.2] [AGA B109.3].
2.17
PRESSURE MEASUREMENT AND CONTROL
One differential pressure sensor with large diameter sensing holes shall be
furnished. A differential pressure transmitter shall be provided and shall
be mounted within 1 m 3 feet of the sensor. A compound vacuum/pressure
gauge shall be installed on each blower. The compound gauges shall be
furnished with a differential pressure range of [0.1 to 100] [_____] kPa
[0.015 to 15] [_____] psig. The piping from the sensor to the transmitter
shall be 3 mm 1/8 inch stainless steel tubing with stainless steel drain
valves on each pipe, at low points. Piping shall be plumbed so that
condensate will drain back into the pipe. The transmitter shall be
equipped with zero and span adjustment, and shall provide a standard
volumetric output rate reading to the chart recorder (included with the
control system) without the need for separate compensating pressure or
temperature transducers. A pressure gauge shall be installed on the
discharge side of each blower. The pressure gauges shall be furnished with
a range of 0 to 34 kPa 0 to 5 psi. The gauges shall be weatherproof, with
113 mm 4-1/2 inch dials and Type 316 stainless steel Bourdon tubes. The
gauges shall be furnished with pressure snubbers and diaphragm seals and
valves. Isolation valves shall be installed between the process pipe and
the seal. Diaphragm seals shall be furnished with top and bottom housings
and diaphragms of Type 316 SS. The diaphragm cavities shall be liquid
filled with silicone.
2.17.1
Draft Gauges
Draft gauges shall be Type I, Class 1 or 2, as applicable, conforming to
ASME B40.100 with a diaphragm or bellows actuating system and a circular
scale. The gauges shall have a zero adjustment screw. Suitable shutoff
cocks shall be provided.
2.17.2
Pressure Gauges
Pressure gauges shall conform to ASME B40.100 and be of pressure detecting
Class, single Bourdon tube style, and suitable for detecting air pressure.
2.17.3
Pressure switches shall be provided to activate the blowers.
2.17.4
Pressure Release
A pressure release valve shall be located on the off-gas line upstream of
the oxidizer.
2.18
EXPLOSIMETER
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NOTE: The fuel concentration should be greater than
SECTION 11378
Page 25
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