RMNKBR
Mechanical
- Oct 26, 2004
- 7
I work in a gas compression field that and mainly use 2 stages or 3 stages reciprocating compressors with capacities range from 4 to 25 MMSCFD (Suction pressures from vacuum to 50 psig @ 110°F and Discharge is 450 psig).
Normal composition of the natural gas in our gas gathering system is 75% C1, 10% C2, 5% C3, 0.1% N2 and 3% CO2 (rest is IC4, C4, IC5, C5 and C6).
It is possible that CO2 injection happens in the field and CO2% will certainly increase in the gas gathering system. I'm evaluating the imapact of CO2% increase on the recip compressor performance and mechanical condition of components.
Assuming 20% CO2 in the performance runs the 1st stage and 2nd stage discharge temperature are around 250°F (increase of 5°F from 3% CO2). Assuming extreme case of 92% CO2 result is 260°F (Total rod load increased only 6%).
I found acceptable conditions in terms of temperatures and rod loads but the other concern is about corrosion and therefore need of replacement of internal components due to CO2% increase.
I'd appreciate comments or links to technical papers about the same subject. At this time our units have 98% availability and we need to identify all possible problems thta CO2 will bring.
Thanks very much,
Normal composition of the natural gas in our gas gathering system is 75% C1, 10% C2, 5% C3, 0.1% N2 and 3% CO2 (rest is IC4, C4, IC5, C5 and C6).
It is possible that CO2 injection happens in the field and CO2% will certainly increase in the gas gathering system. I'm evaluating the imapact of CO2% increase on the recip compressor performance and mechanical condition of components.
Assuming 20% CO2 in the performance runs the 1st stage and 2nd stage discharge temperature are around 250°F (increase of 5°F from 3% CO2). Assuming extreme case of 92% CO2 result is 260°F (Total rod load increased only 6%).
I found acceptable conditions in terms of temperatures and rod loads but the other concern is about corrosion and therefore need of replacement of internal components due to CO2% increase.
I'd appreciate comments or links to technical papers about the same subject. At this time our units have 98% availability and we need to identify all possible problems thta CO2 will bring.
Thanks very much,