3.3.5.4
Check Valve
Check valve shall be provided on the discharge side of each blower and
shall have a cast-iron or steel body, a single steel or aluminum swinging
disc, or dual discs. Dual disc valves shall have acrylonitrile-butadiene
rubber seals on the seating surface. Piping connection shall be flanged.
Valve shall be suitable for use in the maximum operating pressure range and
shall have a maximum pressure loss of 0 kPa 0.0 psi at maximum blower
capacity.
3.3.5.5
Snubber
Air inlet to blower shall be provided with a snubber in order to reduce any
vibration of the blower being transmitted to the air filter. Pressure drop
across each snubber shall not exceed 3.45 kPa 0.5 psi at maximum blower
capacity.
3.3.5.6
Expansion Joints
Expansion joints shall be of the rubber spool type made of duck and
chloroprene with a single arch in the middle, reinforced with steel wire
rings, flanged and fitted with zinc-coated split retaining rings. Expansion
joints shall be suitable for use with pressures up to 103.4 kPa 15 psig and
temperatures up to 135 degrees C 275 degrees F. Expansion joints shall be
provided in the air piping system at the inlet and outlet of the air blower.
3.3.5.7
Pressure Gage
Pressure gage in the air blower discharge piping shall be of the Bourdon
spring type, with corrosion-resisting movements. Cases shall be finished
in baked enamel. Gages shall be provided with shut-off cocks or valves and
shall have an operating range of 0-103.4 kPa 0-15 psi.
3.3.5.8
Thermometer
Thermometer shall be straight form or dial type. Thermometer shall have
brass or stainless steel case. Thermometer shall be moisture-proof,
dust-proof, shock proof, and vibration-proof. Thermometer shall have a
stainless steel temperature sensing bulb not less than 50 mm 2 inches long,
with 13 or 19 mm 1/2 or 3/4 inch male pipe thread connection. Thermometer
shall read to a maximum temperature of 20 percent above maximum operating
temperature.
3.3.5.9
Guards
Belts, sheaves, couplings, projecting setscrews, keys, and other rotating
parts, located so that any person may come in close proximity thereto,
shall be fully enclosed or properly guarded in accordance with ASME B15.1.
3.4
FROTH CONTROL SYSTEM
3.4.1
General
The froth control system shall include pump, piping spray nozzles, valves,
and discharge strainer. The pump shall pump clarified effluent from the
upper part of the settling tank to the spray nozzles in the settling tank.
A strainer shall be located on the discharge side adjacent to the pump. A
hose bibb easily accessible from the walkway shall be provided in a branch
from the froth control system main line piping. A gate valve shall be
SECTION 11375N
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