2.6.1
Expansion Tank
One expansion tank shall be furnished. The tank shall be constructed,
stamped, and certified in accordance with ASME BPVC SEC VIII D1 for an
operating pressure of [_____] kPa psig and temperature of [_____] degrees C
degrees F. Connections and piping inserts shall be adequately supported
structurally as required for the service. A standard manhole, actuating
device for feed water control, alarm devices, gauge glasses, floats, and
controls as required, shall be provided for the proper functioning of the
expansion tank. Expansion tank shall be hydrostatically tested at the
factory.
2.6.2
Dump Tank
A dump tank shall be furnished. The tank shall be constructed, stamped,
and certified in accordance with ASME BPVC SEC VIII D1 for an operating
pressure of [_____] kPa psig and [_____] degrees C degrees F. Connections
and piping inserts shall be adequately supported structurally as required
for the service. A standard manhole, actuating services for makeup water
control, alarm devices, gauge glasses with shields, floats, and controls as
required, shall be provided as indicated for the proper functioning of the
dump tank. The tank shall be factory tested hydrostatically as specified.
2.6.3
Expansion Tank and Dump Tank Fittings
Tank fittings shall conform to ASME BPVC SEC VIII D1 and shall include the
following:
a.
Pressure gauge.
b.
Water level gauge.
c.
Level controls.
d.
Thermometer.
e.
Drain valves; hard seat, seatless pattern; rating 400 to 600 pound
class.
f.
Vent valves; Class 600 600 pound steel bar stock, OS&Y.
g.
Safety relief valves shall conform to ASME B16.34, and shall be
suitable for a HTW expansion drum at working pressure of [_____]
kPa psig, except all internal parts shall be of steel or stainless
steel with hard facing allowable.
2.7
BLOWOFF SYSTEM
2.7.1
Sample Cooler
Sample cooler shall be water-cooled shell-and-tube type heat exchanger with
stainless steel tubes suitable for cooling the blowoff before sampling.
The cooler shall be connected to a header and valved so that the operator
can obtain a sample of properly cooled blowoff from any boiler as desired.
The cooler shall be properly supported and shall have a steel sampling
cock. A sampling glass container suitable for handling the water
temperature to be encountered and a hydrometer or equivalent device
suitable for measuring the concentration of solids in the boiler blowoff
and reading in parts per million shall be provided.
SECTION 15555A
Page 49
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