2.5.5
Controls
2.5.5.1
Compressor Controls
A magnetic starter, start-stop pushbuttons, and a circuit breaker with
manual reset shall be provided for the compressor. Circuit breaker shall
be in accordance with NEMA SG 6 and motor controls shall be in accordance
with NEMA ICS 1, NEMA ICS 2, NEMA ICS 3, NEMA ICS 4, NEMA ICS 6, UL 508,
and UL 845. A relief regulator system consistent with the system
operational pressures shall be provided. A flame arrestor, moisture
separator, and sediment trap shall be provided on the suction piping to the
compressor. All controls shall be 120 volts ac, single phase, 60 Hz, and
shall be housed in an explosion-proof NEMA 250, Type 7 enclosure.
2.5.5.2
Automatic Programming
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NOTE: Include this paragraph only if paragraph
COMPRESSED GAS SLUDGE MIXING SYSTEM is specified.
**************************************************************************
Equipment shall be provided to automatically program a predetermined
discharge period through the diffusers in sequence. The time period shall
be adjustable. A selector switch shall be provided to allow discharge to
any desired diffuser.
2.5.6
Compressor Housing
A weatherproof enclosure shall be provided for the compressor and motor
assembly. The enclosure shall have lockable access doors and shall be
louvered for ventilation. [The enclosure shall be insulated and equipped
with a thermostatically controlled electric heater.] The enclosure shall
be mounted on the digester cover.
PART 3
EXECUTION
3.1
WELDING
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NOTE: If the need exists for more stringent pipe
welding requirements, delete the sentences in the
first set of brackets.
**************************************************************************
[Piping shall be welded in accordance with qualified procedures using
performance qualified welders and welding operators. Procedures and
welders shall be qualified in accordance with ASME BPVC SEC IX. Welding
procedures qualified by others, and welders and welding operators qualified
by another employer may be accepted as permitted by ASME B31.1. The
Contracting Officer shall be notified 24 hours in advance of tests and the
tests shall be performed at the work site if practical. The welder or
welding operator shall apply his assigned symbol near each weld he makes as
a permanent record. Structural members shall be welded in accordance with
Section 05090A WELDING STRUCTURAL.] [Welding and nondestructive testing
procedures for piping shall be as specified in Section 05093 or 15216N
WELDING PRESSURE PIPING.]
SECTION 11380
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