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Deposits of FeC03 in positive displacement gas compressor piston

Deposits of FeC03 in positive displacement gas compressor piston

(OP)
We found deposits of FeCO3 in the piston of a natural gas compressor. The gas directly from the well pass through an inlet separator before entering the compressor. We also found organic material that covered the FeCO3 deposit. One thing to mention is that molar % of CO2 is almost 0.
I would like to know what is the cause of this deposit. Any ideas???
Thanks.

RE: Deposits of FeC03 in positive displacement gas compressor piston

so tell us about the vacuum on the system.

RE: Deposits of FeC03 in positive displacement gas compressor piston

(OP)
The system pressure of the inlet separator is around 460- 510 psi (32-36) kg/cm2.
The gas is compressed at 1060 psi (75 kg/cm2).  

RE: Deposits of FeC03 in positive displacement gas compressor piston

so, there is no vacuum farther upstream?  How about a CO2 treat way upstream?  Other than that, the FeCO3 has to be coming from the formation.

RE: Deposits of FeC03 in positive displacement gas compressor piston

(OP)
No, there are no treatments for CO2 removal, and the gas directly from the well pass through a trifasic separator, and enters the compressor.
 

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