What is air compressor surge?

What is air compressor surge?

Surge is defined as the operating point at which centrifugal compressor peak head capability and minimum flow limits are reached. When the plenum pressure behind the compressor is higher than the compressor outlet pressure, the fluid tends to reverse or even flow back in the compressor.

What is surge count?

Simple operation of the Surge Counter means a dependable performance and long life. Arrester discharge current passes through a shunt arrangement to charge a capacitor; discharge of this capacitor through a solenoid operates the cyclometer count.

What causes a surge?

Power surges can originate from the electric utility company during power grid switching. Another common cause of power surges, especially the most powerful ones, is lightning. Power surges can also originate inside a home when large appliances like air conditioners and refrigerator motors turn on and off.

When does a surge occur in a compressor?

Surge occurs when there is no forward flow of gas through the compressor and a reversal of flow occurs. The gas that is being compressed gets pushed backward through the centrifugal compressor. When this surge (flow reversal) occurs, which can happen in milliseconds, the rotor is affected. It will shift to one end in its normal running position.

How does anti surge control work on a centrifugal compressor?

The resulting increase in compressor inlet volume flow moves the operating point away from surge. Due to inaccuracies in measurements and response times of transmitters and valves, Anti-surge control achieves a surge control line (SCL) parallel to the surge limit line.

Can a gas turbine compressor stall and surge?

Although modern design and fuel control systems are capable of keeping a gas turbine in electric generation service away from operating conditions conducive to stall and surge, it is important to know something about each condition. With this as an enjoinder, let’s look at how an axial compressor operates.

What is programmable logic controller for compressor surge?

The Advent of Programmable Logic Controller (PLC) for compressor surge control With the limitations of using black box technology being recognized, industry honchos realized the necessity of standardizing and generalizing control systems and their respective programming languages.