Can a 2-Stage Reciprocating Compressor Handle Lower Suction Pressure?

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Discussion Overview

The discussion centers on the operational capabilities of a 2-stage reciprocating compressor, specifically regarding the handling of lower suction pressures and the implications of introducing gas at an intermediate pressure. Participants explore the effects on flow rates and pressure adjustments within the compressor stages.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether introducing 400 psi gas into the low-pressure stage (120 psi) will be manageable for the compressor.
  • Another participant clarifies the current setup, noting that the 400 psi gas is bypassing the first stage and entering the second stage, and discusses the relationship between inlet pressure and flow rate for reciprocating compressors.
  • A participant seeks to understand if the suction pressure on the first stage needs adjustment when introducing the 400 psi gas into it, or if the suction pressure will automatically increase due to the higher inlet pressure.
  • One participant expresses confusion about the current configuration and the nature of the gas being compressed, suggesting that introducing 400 psi into the first stage may require regulation to avoid exceeding the machine's specifications.

Areas of Agreement / Disagreement

Participants have not reached a consensus on whether the compressor can handle the introduction of 400 psi gas into the first stage or the necessary adjustments to suction pressure. Multiple viewpoints regarding the operational parameters and configurations remain unresolved.

Contextual Notes

There are uncertainties regarding the specifications of the compressor and the nature of the gas being compressed, as well as the implications of changing the inlet pressure on the overall operation of the machine.

christwllms
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I have a 2 stage reciprocating compressor that is set at a suction pressure of 120 psi and discharging at the second stage of 1160 psi. currently I have gas going in at intermediate pressure at 400 psi compressing about 15 mmscfd. My questions are this:

1. Will the compressor handle it if I take that 400 psi gas and put it into the low pressure stage (120 psi)?

2. Will the flow rate for the compressor remain the same?
 
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Can you clarify where you're introducing the 400 psi? Is it presently bypassing the 1'st stage and going into the second stage? Or are you putting it into the first stage?

For a recip machine, the flow rate will increase as inlet pressure increases assuming the machine can handle the pressure, which generally isn't a good assumption. Flow for a recip is just density times displacement.
 
Currently the 400 psi is is bypassing the 1st stage and going into the 2nd stage. I'm looking at taking the 400 psi off of the 2nd stage and put it into the 1st stage. Do you have to adjust the suction pressure on the the 1st stage or will the suction pressure raise due to the increased inlet pressure or do nothing at all.
 
Sorry, I don't understand what you're trying to do. You have 400 psi (air? what's the gas?) going into the second stage right now but what's going in the first stage? Do you have 120 psi gas going into that? Then all of the gas is going through the 2'nd stage and out at 1160?

Sounds like you want to introduce 400 psi into the first stage, but that would have to be let down through a regulator or something so you don't get 400 psi at the inlet of the first stage... unless the machine is made to handle it which isn't clear.
 

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