Use in explosion-prone zones
45 0000000141 - 002 - EN
10.4 Operation with combustible operating fluids
WARNING
Risk of sustaining injury due to explosion!
An ignitable gas mixture in the gas booster may cause explosions. This can lead
to accidents resulting in severe injuries or death.
► Precautions must be taken to prevent the formation of ignitable gas mix-
tures in the gas booster during commissioning.
► Precautions must be taken to prevent the formation of ignitable gas mix-
tures in the gas booster during decommissioning.
When the gas booster is in operation, the leakage collects via the high-pressure
seal in the back chamber of the high-pressure piston. In case of combustible op-
erating fluids, this may cause the formation of an ignitable mixture.
Without further measures, the safety level will be adequate during regular oper-
ation of the gas booster (zone 2) if the gas has an ignition temperature of over
200 ° C.
If the gas booster requires an adequate safety level in the event of foreseeable
faults (zone 1), the back chamber of the high pressure piston must be purged.
How to purge the back chamber of the high pressure piston is explained below.
10.4.1 Purging plans for the compression of combustible gases
Purging plan for single-stage, double-acting gas boosters
1) Prior to commissioning the gas booster, connect nitrogen to the inlet pres-
sure port (A) and to the purge port (SFP).
2) Switch on the gas booster for approx. 1 minute (based on the volume to be
purged).
3) Switch off the gas booster after the purging process has been completed.
4) The inlet pressure line (A) may then be connected with the gas source.
During the compression process, it is not necessary to continuously purge
the purge port with nitrogen, since with single-stage, double-acting gas
boosters, no ambient air is sucked in via the common bleed line.
5) After the compression process has been completed, purge the compression
chamber again as described in step 2.
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