MAXIMATOR VP30, Maintenance Information, Page: 4 / 42

VP30/VP500
MAINTENANCE INFORMATION
Description of compressor parts
Compressor Stages
The Compressor takes gas from the suction vessel at approximately 6 BarG and compresses it in
three stages up to a maximum of 350 Bar (5000 psi). Three stages of compression are used
together with the intercoolers, to reduce the temperatures at each stage of compression.
The cylinder bores reduce in size from the first to the third stage, as the pressure in-creases.
All cylinders have cooling fins to dissipate the compression heat in the blast from the fan. Each
stage of compression has a suction valve and a delivery valve located in the cylinder head to
prevent the gas from flowing back into the previous stage.
Coolers
After each stage of compression, the gas is passed through the coiled cooling coils at the front of
the compressor to remove the heat of compression. In front of the cooling coils is a large air blast
fan which blows cooling air first over the cooling coils and then over the finned cylinders and
cylinder heads. The cooling coils are copper.
Crankcase Breather
Because the compressor is a gas compressor, the crankcase is connected to the first stage inlet, to
prevent wastage of any gas which blows past the piston rings.
Motor
The motor is a three-phase induction motor. It is linked via a belt drive coupling to the end of the
compressor crankshaft.
Oil Filler
The oil filler cap is where the lubricating oil is added to the
compressor.
See later this section for filling and changing
instructions.
Microfilter
After the final cooler and condensate separator is a small
Microfilter, which removes any remaining oil droplets from the
compressed gas. The drain of the filter is piped to the unloader
system so that it vents automatically whenever the compressor
stops running. It is not necessary to drain this filter periodically.
Because of the limited volume of the filter, CINPRES’s control
systems Include an ‘Autovent’ facility to stop the compressor for
a short period (normally 1 minute) after a set running time
(normally 30 minutes). This ensures that the filter bowl does not
become full and prevents oil from being passed over into the
high pressure gas line.
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