Calculators › Equipment Design › Compressor HP
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Compressor Horsepower Calculator

Per GPSA, API 617, & ASME PTC-10

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Compressor Horsepower Calculator
Calculates gas compression power requirements using polytropic or adiabatic methods. Determines brake horsepower, discharge temperature, and efficiency per GPSA, API 617, and ASME PTC-10 standards.

Flow & Pressures

MMSCFD
Million standard cubic feet per day
psig
Inlet pressure (gauge)
psig
Outlet pressure (gauge)

Gas Properties

Select gas type for k-value
Cp/Cv
Automatically set by gas type
°F

Performance Parameters

-
Typical: 0.72-0.85 (reciprocating), 0.75-0.82 (centrifugal)
-
Typically 0.85-1.0 for most gases
Size motor with service factor
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Formula

HP = (Q × 43.67 × (k/(k-1)) × P₁ × [(P₂/P₁)^((k-1)/k) - 1]) / (η × T₁ × Z)
Q = Flow (MMSCFD)
k = Cp/Cv ratio
P₁, P₂ = Pressures (psia)
η = Efficiency
T₁ = Inlet temp (°R)
Z = Compressibility

Standards & References

  • GPSA Data Book
    Gas Processors Suppliers Association
  • API 617
    Axial and Centrifugal Compressors
  • API 618
    Reciprocating Compressors
  • ASME PTC-10
    Performance Test Code for Compressors
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