b.
Electrical relays: Locate in an enclosed portion of panel,
accessible for easy servicing.
c.
Controls and interlocks:
(1)
Condenser fan
(2)
Compressor across the line contactor
(3)
Thermostatic control switch
2.3
HIGH PRESSURE AIR RECEIVERS [AND] [SEPARATORS]
**************************************************************************
NOTE: Do not permit field welding on high pressure
air receivers unless controls over welding processes
and nondestructive testing required by the military
specification can be implemented in the field.
**************************************************************************
ASME BPVC SEC VIII D1, constructed and stamped, seamless, forged, [20,682]
[34,470] kPa (gage) [3,000] [5,000] psig design working pressure, minimum
safety factor of 4, corrosion allowance of [1.60] [_____] mm [1/16] [_____]
inch, straight thread, 0-ring sealed, forged steel inlet, outlet, and drain
plugs, straight or angle connection as indicated or required. [Capacity]
[Capacities] as indicated. After heat treatment, examine exterior of
vessel by liquid penetrant or magnetic particle test; no defects are
permitted. Furnish certified (non-destructive examination) NDE report for
high pressure air receiver. After hydrostatic testing at the factory,
clean the flask to oil-free condition. Abrasive blast interior and
exterior to near white condition in accordance with SSPC SP 10. Vacuum
clean surfaces to remove dust and debris. Check surfaces with black light
to ensure there is no oil. Apply 2 or 3 coats of epoxy coating 0.20 mm 8
mils minimum dry film thickness, with white finish coat for the interior
and gray finish coat for the exterior. Provide certification of factory
tests. Securely support receiver and equip with pressure gage, drain
valve, and ASME BPVC SEC VIII D1 and ASME BPVC SEC IX code stamped pressure
relief valve set as indicated and piped to discharge in a safe manner.
Piping shall conform to [20,682] [34,470] kPa (gage) [3,000] [5,000] psig
standards. Provide each receiver with internal or external blowdown and
drain line with manual valve in accessible location, or with extension
stem, discharging through a visible open sight drain. Do not manifold
cylinder drain piping together. Attachment welds to receiver [and
separator] shall not be permitted. Register vessel with NBBI and mark
registration number on vessel.
2.4
MEDIUM PRESSURE AIR COMPRESSOR
**************************************************************************
NOTE: Prepare section for cooling water and include
in project specification. See Section 15181 for
piping and equipment which may be useful.
**************************************************************************
869 to 2751 kPa (gage)126 to 399 psig system. [Multi-stage] [Two-stage]
[Single-stage], [air] [water] cooled reciprocating, [belt] [direct] driven
type, suitable for supplying compressed air at pressures indicated.
Provide compressor with ball or roller type bearing, pressure lubricated,
SECTION 15212N
Page 20
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