separator shall be provided with an automatic water discharge trap and
level gauge. The air receiver shall be vertical type constructed in
accordance with ASME BPVC SEC VIII D1 and shall be equipped with flanged
inlet and outlet connections, valved drain connection, 152 mm 6 inch dial
pressure gauge, pop safety valves, and regulator connections. Cooling
water controls for regulating compressor cylinder water temperature and
aftercooler water temperature shall be thermostatic valve type and shall be
installed with a three-valve bypass in the water outlet lines ahead of open
sight drain funnels. The compressor shall be equipped with adjustable,
pressure type unloader controls suitable for continuous compressor
operation.
2.18.2
Instrument Air Compressors
**************************************************************************
NOTE: The designer should determine if two
redundant full size instrument air compressors will
be required as loss of air will cause unit shutdown
unless other provisions are made, such as crossties
to the soot blower/service air system. Delete
paragraph if not required.
**************************************************************************
An electric motor-driven oil-free automatic air compressor unit and a
refrigerating drying unit shall be provided. The air compressor shall be
capable of delivering at a pressure of [_____] kPa psig not less than
0.00472 cubic meter/sec 10 scfm dry air at an atmospheric dew point of -18
degrees C 10 degrees F with entering air at 35 degrees C 95 degrees F,
saturated. The air compressor unit shall be sized to run not more than 60
percent of the time when all controls are in service. The air compressor
unit shall be complete with all necessary accessories including automatic
pressure control equipment, relief valves, check valves, air filters,
moisture traps, and a receiver with ample capacity for emergency operation
of the controls for 15 minutes after compressor shutdown. The receiver
shall be of vertical construction, in accordance with ASME BPVC SEC VIII D1,
with relief valve and drain fittings. The air dryer shall be a
self-contained, refrigerated type complete with refrigeration compressor,
heat exchanger, automatic controls, and moisture removal trap or a
regenerative desiccant type dryer, as required. The refrigeration unit
shall be the hermetically-sealed type capable of continuous operation at
maximum load conditions.
2.19
PIPING
Unless otherwise specified herein, pipe and fittings shall conform to the
requirements of ASME B31.1.
2.19.1
Pipe
Pipe material shall be as specified in TABLE I, except fuel oil pipe
material shall comply with Section 13202 FUEL STORAGE SYSTEMS.
2.19.2
Fittings
Pipe fittings shall be as specified in TABLE II, except fuel oil fittings
shall comply with Section 13202 FUEL STORAGE SYSTEMS.
SECTION 15555A
Page 59
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