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Engineering demo

Centrifugal Compressor HP

This calculator estimates the horsepower (HP) required for a centrifugal compressor based on suction conditions, discharge pressure, gas properties, and adiabatic efficiency. It first computes the adiabatic head (energy added per unit weight of gas, expressed in feet) and then converts that requirement into compressor power.

Centrifugal compressor horsepower application with engineering inputs and calculated outputs

SpreadsheetWeb application example

About this compressor horsepower calculator

Centrifugal Compressor HP demonstrates how an engineering workbook can become a focused browser application without rebuilding its calculation logic. The model combines suction conditions, discharge pressure, mass flow, gas properties, and adiabatic efficiency to estimate the required compressor head and power.

Adjust the operating conditions below to compare scenarios. Every valid change is sent through the website’s secure server-side gateway, calculated by the published SpreadsheetWeb model, and returned as an updated engineering result.

Live engineering model

Estimate compressor head and horsepower

Enter the operating conditions and gas properties. The estimate recalculates automatically from the published spreadsheet model.

Operating conditions

Compressor inputs

350 °RAbsolute inlet temperature in degrees Rankine. Higher inlet temperature generally increases compression work.
350 °R1,000 °R
2 psiaAbsolute inlet pressure. Raise the discharge pressure first to make higher suction settings available.
2 psia4 psia max
5 psiaAbsolute outlet pressure. The minimum follows suction pressure so P₂ always remains greater than P₁.
5 psia min3,000 psia
Mass flow affects required horsepower. Leave it blank to calculate head without a flow-driven power estimate.
Wlb/minLeave blank to view head with zero horsepower
0.50Fraction of ideal adiabatic performance. Higher efficiency generally reduces the real power required.
0.500.88
1.00Average gas compressibility through the compression path. A value of 1.0 represents ideal-gas behavior.
0.601.20
07 Working fluidAir uses fixed gas properties. Turn it off to supply a custom adiabatic component for another gas model.
Disclaimer

The information provided by this calculator is intended for informational and educational purposes only. The default figures shown are hypothetical and may not be applicable to your individual situation. We are not responsible for the consequences of decisions or actions taken in reliance upon the information provided by this tool.

Calculation approach

How the calculation works

  1. Pressure ratioThe compression severity is set by P2 / P1.
  2. Adiabatic headTemperature, k, Z, and the pressure ratio determine the ideal head required to reach the discharge pressure.
  3. HorsepowerMass flow and head are converted into power, then adjusted by adiabatic efficiency to reflect real equipment demand.

Engineering interpretation

Understand what moves the result

  • Higher discharge pressure or lower suction pressure increases required head and horsepower.
  • Higher inlet temperature generally increases the required work for compression.
  • Higher flow increases horsepower nearly proportionally.
  • Lower efficiency increases the real power needed for the same ideal head.
  • Compressibility factor and k affect how strongly the gas responds to compression.

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