Nov 1, 2008 - Kinetic or Dynamic: this type of compressor includes centrifugal and. These performance curves were supplied to the simulation software and.

In the article, we will discuss how to read a centrifugal Compressor Performance Curve. If you are new to the compressor, this article will definitely make yourself familiar with the centrifugal compressor performance curve. If you already know about the centrifugal compressor performance curve, definitely this article will refresh your knowledge.

Now let we see the performance curve. The centrifugal compressor performance curve consisting of the following three important curves • Differential Pressure (or some cases Polytrophic Head) Vs Inlet Flow rate • Brake Power Vs Inlet Flow rate • Efficiency Vs Inlet Flow rate. Contents • • • • • • • • • • • • Differential Pressure Vs Inlet flow rate In this curve, the differential pressure is on the vertical axis and Inlet Flow rate is on the horizontal axis.

With an increase in compressor inlet flow rate, the head developed by the centrifugal compressor start decreases. The compressor develops maximum differential pressure (head ) is called Surge (3A).

The flow and pressure corresponding to the surge point are called surge flow and surge pressure. When the inlet flow rate is increased to the right (Refer below curve), the differential pressure (head) keep on decreases up to a maximum flow rate. It is called as “Stonewall point” or “Stall Point”. This is maximum operation range of a centrifugal compressor recommended by the compressor manufacturer. The inlet flow rate and differential pressure (head) are related to each other, one cannot be changed without varying the other parameter. The relationship between inlet flow rate and differential pressure (head) is locked until wear or increased shaft seal clearance of the centrifugal compressor. Brake Power Vs Inlet Flow Rate In this curve, the Break power is on the vertical axis and Inlet Flow rate is on the horizontal axis (Refer below performance curve).

As we seen from the curve, the brake power does not start from zero, the minimum power represents in the curve is to overcome the frictional losses and centrifugal compressor inertia. From this curve, the required brake power is obtained from the corresponding inlet flow rate. Efficiency Vs Inlet Flow Rate As we seen from the performance curve, the efficiency curve is raising as the flow rate increase. Then the curve reaches the maximum point and starts decreasing.

The maximum point is called Best Efficiency Point (BEP). It is always preferred to run the centrifugal compressor at the best efficiency point (BEP), but in the practical case, we are not able to match the required centrifugal compressor operating point with compressor BEP. If the centrifugal compressors run at or near to BEP, not only we get higher efficiency and also the less vibration of the compressor.

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How to read a Centrifugal Compressor Performance Curve? Now we will various curves and point so check in the centrifugal compressor performance curve. Consider a centrifugal compressor with Rated Flow rate – 66000 kg/hr Suction Pressure – 10 bar Discharge Pressure – 65 bar Differential Pressure – 55 bar Operating Point The Red Colour-mark represents the operating point of the centrifugal compressor. The correspond flow is called operating flow and the corresponding discharge pressure is called “Operating Discharge Pressure”. As per our example, the operating flow is 66000kg/hr and discharge pressure is 65 bar.

Sometimes the compressor manufacturer will provide polytropic head or differential pressure instead of the discharge pressure. The below formula is used to calculate the polytropic head.