Calculators›Recip Compressor Sizing
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Reciprocating Compressor Sizing

Preliminary Estimate Using Industry-Standard Methodology

Preliminary Sizing Estimate
Estimate number of stages, brake horsepower, and interstage pressures for reciprocating compressor applications using industry-standard methodology for natural gas service.

Operating Conditions

psia
psia
MMscfd
Standard conditions: 14.696 psia, 60°F
°F

Gas Properties

relative to air

Design Parameters

°F
Temperature after interstage coolers
:1
Typical 3.0-4.0 for natural gas

Sizing Formulas

Parameter Formula
Compression RatioCR = Pdischarge / Psuction
Number of StagesINT(ln(CR) / ln(3.5) + 0.90)
Estimated BHP21 × CR1/n × n × Q × 1.154
Interstage PressurePs × CRstage/n

Learn the Theory

Understand reciprocating compressor sizing methodology and cylinder selection

Read Engineering Guide

Sizing Notes

Preliminary Estimate: This calculator provides preliminary sizing for budgetary purposes. Final sizing requires OEM software with actual cylinder data.
Clearance Effect: Normal cylinders average ~20% clearance; pipeline cylinders average ~60% clearance. Higher clearance reduces volumetric efficiency.
Safety Margin: Results include typical OEM adjustment factor (1.154) for valve losses and real gas effects.

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