Answer Posted / sandip goswami
'Surging' is 'A momentary back-flow' through the compressor from the discharge to the suction. This can occur when the mass flow of gas to the compressor falls below a critical level with a high pressure difference across the machine. When there is not enough gas to replace that being pushed forward, discharge gas will flow backwards through the compressor towards the suction side. This back-flow will tend to decrease the speed of rotation while the speed controller will try to maintain the correct speed. The gas flowing backward provides more volume to the suction side and the compressor picks up and begins to push gas forward again. The machine speed will tend to increase and the governor will again try to maintain the correct, set speed. All of this takes place very quickly; the backward and forward gas flow together with the speed control action causes rapid fluctuations in the flow and pressure of the system. This 'Surging' in the machine can be very damaging to the compressor and associated piping and equipment due to heavy vibrations set up in the system. Generally, if the suction flow drops too low, a 'Low-flow Trip' will shut down the machine. Also, surging can cause the machine to 'Overspeed' before the control system can react.
These problems of Surging are usually prevented by an 'Anti-surge' system and control valve which, externally, recycles discharge gas back to the suction side in order to maintain a 'Minimum Flow Rate' to the machine.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
How does your previous experience relate to the job you are applying for ?
I need control valve ISA hand book. Is there any site to download that big book containing all the pages. Written by Paul Friedmann
what is use of communication wire in multipare cable(oil and gas field), why this communication wire not used in single pair cable?
Why not come out analog output in ABB EL3020 when display show correct value
what is loop1 and loop2 in MTS LT?
what is performance test.need defination
How to check vortex flow meter is in good condition while we do not having calibration setup?
I want to measure and control level in tank of size 10*5 filled with gasoline, so plz give me the solution with clear details. how to select transmitter and sensors.
What is Alpha & Beta fctors related to Orifice Plate & its relation with flow?
How we connect a instrument with ground, Give brief explanation with help of diagram?
how do we commission inergen system?
Can anybody tell me how to select the size of earthing cable for DCS & PLC system.Please tell me any relevant answer here or mail it to me.
If fire would be inside the plant which fire detector is to detected the fire.
is motorized valve closed when power shutoff?
1)How many tpes of vibration probe and how many tpyes of vibration. 2)how we can calibrate a vibration probe with tk3 3)what is RMS value in vibration measuring application and how we calculate it.
