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A receiver may also be used to isolate centrifugal compressors (or other equipment) from
pulsations created by positive displacement air compressors. A pulsation bottle may be
needed to eliminate pulsations more effectively.
Control Air Piping
The control air pipe penetration is made at a minimum of 10 pipe diameters downstream of
the discharge check valve in the discharge pipe (see Figure 1.6). The control air line
connects to the control panel bulkhead fitting marked 'CA' (see Figure 1.8), which is a 1/2
inch NPT connection. The control air line should be a minimum of 1/2 inch diameter, made of
a non-rusting material such as stainless steel, aluminum, or copper. If the line is to be
installed in a horizontal run of pipe, it should be located at the top of the discharge pipe to
minimize condensate or debris buildup in the line. The control air line should be routed to the
control panel in such a manner that the line will not have to be disconnected in order to
perform major maintenance. A drip leg with a drain valve, which can be used to remove
condensate, is recommended as part of the customer's control air line.
Instrument Air Piping
Instrument air must be provided for the operation of the pneumatic control valves and for the
seal buffer air. The air used must be clean dry instrument quality air. For best results, piping
should be connected to a refrigerated air dryer and filter prior to connection on the unit. The
Centac compressor normally requires 10 SCFM (0.33 m
(414-827 kPa).
The final filtering medium should be rated at a theoretical efficiency of 99.9999%, particle
size of 0.01 micron, and a minimum or 25 SCFM (0.82 m
close to the control panel. An isolation valve may be located ahead of the filter.
Piping from the instrument air source should be constructed of 1/2 inch minimum
non-corroding material to limit the possibility of corrosion products entering the system.
Control Air
PT3
PT4
PT1
Figure 1.8
Control Panel Connections
SECTION 1 – PLANNING & INSTALLATION
Instrument Air
3
/m) of air at 60-120 PSIG
3
/m). This filter should be located
2000 Ingersoll-Rand Company
Date of Issue: 12 September, 2000
Seal Air
Power Air
Centac Instruction Manual
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