control to stop compressor after a 10 minute unloaded period when
air is not used. Compressor shall re-start automatically at a
preset minimum pressure.
c.
A lead-lag system shall be provided to alternate compressor
start-ups and to operate both compressors when discharge pressure
cannot be met with one operational compressor. The operator
selector switch shall have the following positions:
(1)
Both compressors alternating as specified above;
(2)
Compressor "A" operation only;
(3)
Compressor "B" operation only;
(4)
Off.
Total elapsed time shall be recorded for operation time of each
compressor.
d.
Compressor Safety Controls and Management Panel:
(1) Provide light in panel, alarm and shutdown of compressor for
the following functions:
(a)
High Main Bearing Temperature
(b)
High Discharge-air Temperature
(c)
High Discharge-air Pressure
(d)
High Water Temperature for [Water Supply,] [Intercooler,]
[Aftercooler,] [Lubrication Oil Cooler]
(e)
Excessively High Motor Temperature
(f)
Excessive Vibration
(g)
Low Crankcase Oil Level
(h)
Low Oil Pressure
(2)
Provide light in panel and alarm for the following functions:
(a)
High Lubrication Oil Temperature
(b)
Low Suction Pressure (Dirty Filter)
2.7.2
Instrument Compressed Air System
Provide two instrument air compressor systems each with a compressor,
filters, aftercooler, accessories control panel, controls and receiver,
[mounted on one supporting steel base with skids] [mounted separately].
2.7.2.1
Air Compressor
Each compressor shall deliver a minimum of [_____] std. L/s scfm of air at
20 degrees C 68 degrees F at a discharge pressure of 862 kPa (gage) 125 psig.
Compressor speed shall not exceed [_____] rpm.
Air compressor shall be
SECTION 15502N
Page 81
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