permanently bonded to copper or steel pipe cores threaded at each end for
connecting to external piping. Radiator capacities shall be determined in
accordance with the HYI-005 Rating Code. Radiators shall be equipped with
[expanded metal cover grilles fabricated from steel sheets not lighter than
1.519 mm 16 gauge, secured either directly to radiators or to independent
brackets] [solid front, slotted, horizontal top grilles fabricated from
steel sheets not lighter than 1.214 mm 0.0478 inch thick, secured either
directly to radiators or to independent brackets] [solid front, slotted,
sloping, top cover grilles fabricated from steel sheets not lighter than
1.214 mm 0.0478 inch thick independently secured to masonry with brackets].
[Nonferrous convectors shall be tested hydrostatically at the factory and
proved tight under a pressure of not less than 585 kPa 85 psig.]
2.25
AIR COMPRESSOR
UNITS
Air compressor shall conform to ASME PTC 10, except as specified otherwise.
Compressor speed shall not exceed 900 rpm. Motor speed shall not exceed
1750 rpm.
2.25.1
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 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
separator shall be provided with an automatic water discharge trap and
level gauge. The air receiver shall be vertical type, constructed in
accordance ASME BPVC SEC VIII D1 for unfired pressure vessels for 1.4 MPa
200 psi working pressure, 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.
2.25.2
Instrument Air Compressors
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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
SECTION 15559A
Page 72
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