2.16.3.6
Treated Water Storage Tank
Treated water storage tank shall be fabricated from steel plates not less
than 4.76 mm 0.1875 inch thick for shell and heads, and shall be
constructed in accordance with ASME BPVC SEC VIII D1 for a design working
pressure of 520 kPa 75 psig. Heads shall be dished concave to pressure to
a radius equal to the diameter of the tank. The tank shall be provided
with the connections indicated, an 200 mm 8 inch copper ball float,
lever-operated control valve, valve bypass and accessories, and a protected
gauge glass. The tank shall be the diameter shown and shall have a
capacity of not less than [_____] liters gallons. The tank shall be
hydrostatically tested at the factory at not less than 690 kPa 100 psig.
2.17
HTW SPECIALTIES
2.17.1
Sediment Trap and Blender
The sediment trap shall be constructed, stamped, and certified in
accordance with ASME BPVC SEC VIII D1 for an operating pressure of [_____]
Pa psig and [_____] degrees C degrees F. The receiver shall be sized for
maximum plant flow condition of [_____] L/second gpm and maximum flow
velocity of 150 mm/second 0.5 fps. Receiver heads shall be flanged and
dished and all tank nozzles 50 mm 2 inches and larger shall be flanged
Class 300 300 pound class. An inspection handhole shall be provided. The
receiver shall be hydrostatically tested.
2.17.2
Line Mixer
The line mixer shall be fabricated as indicated using seamless steel
welding pipe fittings. Area of holes drilled in the HTW injector pipe
shall equal or exceed 1.5 times the cross-sectional area of the injector
pipe.
2.17.3
Liquid Level Control Column
The column shall be fabricated as indicated using seamless steel pipe and
standard welding fittings. Forged steel pipe weldolets shall be used for
gauge glass piping connections and float switch connections.
2.18
AIR COMPRESSORS
The air compressor units shall conform to ASME PTC 10, except as specified
otherwise. Compressor speed shall not exceed 900 rpm. Motor speed shall
not exceed 1750 rpm.
2.18.1
Service Air Compressors
The service air requirements shall be as indicated with receivers sized as
indicated. The units shall be suitable for heavy-duty service (soot
blowing). The compressors shall be simplex type, single-stage,
double-acting, with water-jacketed cylinder; fitted with intake and
discharge valves of the lightweight feather, disc or plate type; and shall
be provided with all necessary controls, water-cooled aftercooler, moisture
separator, drive, receiver, relief valves, and cooling water controls as
indicated or required. The compressor air intake shall be provided with a
low drop type air suction filter/silencer suitable for outdoor
installation. The aftercooler shall be the shell-and-tube type designed
for air flow through the tubes with steel shell internal baffle plates and
Admiralty metal tubes expanded into Muntz metal tube sheets. The moisture
SECTION 15555A
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