2.3.5.1
Compressor Start-Up
The compressor shall start unloaded. The manual starting circuit for the
compressor shall have interlocks to prevent the compressor drive motor from
starting until pre-lubrication pump (if provided), oil pressure, and
cooling water pump water flow have been established to the required values
for safe operation as determined by the compressor manufacturer.
2.3.5.2
The compressor shall operate continuously at constant speed after being
started. Provide means to load and unload the compressor automatically at
preset minimum and maximum pressure settings. Minimum pressure shall be
689 kPa (gage) 100 psig, and maximum pressure shall be 862 kPa (gage) 125
psig. Loading and unloading shall be accomplished by a minimum of [three
steps (full load, one-half load, and no load).] [five steps (full load,
three-quarter load, one-half load, one-quarter load, and no load).]
Unloading shall be accomplished by suction valve unloading, clearance
pockets, or a combination of both suction valve unloading and clearance
pockets. Input power at fully unloaded operation shall not exceed 15
percent of full load input.
2.3.5.3
Monitor and Safety Controls
Supplementary electric, electro-pneumatic, or solid state electronic
controls shall be provided to provide alarm and shutdown requirements, plus
interlocks with accessories. Requirements are as follows:
a.
Shutdown requirements shall cause the controlled compressor to
shut down, energize alarms, and light labeled red lights.
b.
Alarm only requirements shall not cause the controlled compressor
to shut down, but shall sound the same alarms and light labeled
amber lights.
c.
Light only requirements shall not cause the controlled compressor
to shut down, but shall light labeled amber lights.
d.
The individual monitor and safety controls shall be as shown on
Table 2.
TABLE 2 - MONITOR AND SAFETY CONTROL SCHEDULE
Light
and
Indicating
Item
Shutdown
Alarm
Light Only
1.
High Discharge Air Temperature
Yes
Yes
-
135 degrees C 275 degrees F
2.
High Intercooler Discharge Water
No
Yes
-
Temperature, Each Intercooler
3.
High Aftercooler Discharge Water
No
Yes
-
Temperature
4.
High Cooling Water Supply
No
Yes
-
Temperature
SECTION 15214N
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