Process Conditions

Gas Flow Rate

MMSCFD

Suction Pressure

psig

Discharge Pressure

psig

Suction Temperature

°F

Gas Properties

Molecular Weight (MW)

lb/lbmol

Specific Heat Ratio (k = Cₚ/Cᵥ)

—

Compressibility Factor (Z)

—

📊 Typical Natural Gas Values

MW: 17–20

k: 1.26–1.31

Z (100 psia): 0.95–0.98

Z (500 psia): 0.85–0.92

Compressor Selection

Compressor Type

Number of Stages

—

Isentropic Efficiency (η_isen)

—

Mechanical Efficiency (η_mech)

—

Efficiency Guide: Centrifugal η_p = 0.75–0.85 | Reciprocating η_p = 0.82–0.88 | Screw η_p = 0.70–0.78

📚 Learn the Theory

Compressor thermodynamics, power equations, efficiency conversions, and API selection criteria

Read Engineering Guide →

Results

Required Driver Power

—

HP (incl. 10% margin)

Standard Motor Size —

Compression Ratio —

Ratio per Stage —

Discharge Temp —

Actual Inlet Flow —

Power Breakdown

Isentropic Power —

Gas Power (Polytropic) —

Brake Power —

Head & Efficiency

Polytropic Head —

Polytropic Efficiency —

Volumetric Eff. (Recip) —

Reference Standards

Calculations follow API compressor standards:

API 617: Centrifugal Compressors
API 618: Reciprocating Compressors
API 619: Rotary Positive Displacement
GPSA 13: Compression Equipment

Power includes: 10% API margin. Always verify with compressor vendor performance curves.

Compressor Sizing Calculator

Process Conditions

Gas Properties

📊 Typical Natural Gas Values

Compressor Selection

📚 Learn the Theory

Results

Reference Standards

Related Calculators

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Line Sizing

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