valve and simultaneously opening the bypass vent valve. Use of the bypass
vent valve alone to achieve pressure control by a modulation technique of
spilling excess air is prohibited. At the low discharge pressure limit,
the inlet valve shall open and the bypass vent valve shall close to load
the compressor.
2.3.5.3
Unloaded Compressor Start-Up
Each of the two pneumatic control mode systems shall have provision for
start-up of the compressor in the unloaded control setting with the
compressor inlet valve closed and the bypass valve open.
2.3.5.4
Electrical Start-Up Interlocks
The manual starting circuit of each compressor shall have interlocks to
prevent starting until pre-lubrication pump oil pressure and cooling water
pump water flow have been established to the required values for safe
operation as determined by the compressor manufacturer.
2.3.5.5
Monitor and Safety Controls
Provide supplementary electric, electro-pneumatic, or solid state
electronic controls to provide alarm and shut down 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 Temperature
No
Yes
-
5.
High Lube Oil Temperature
Yes
Yes
-
6.
Low Lube Oil Pressure
Yes
Yes
-
SECTION 15213N
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