Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / thomas
'Surging' is defined as '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. This can also cause damage and is prevented by an 'Overspeed Trip Mechanism' which will again shut down the machine.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
How to calibrate H2s Dectector
What are different types of orifice plates? State their uses.
can we copy the software from a transmitter using hht(hart 275) ?
Hi my friends Is any one who can assist me in knowing the typical interview questions for system engineer at General Electric pty Ltd
What is the GK Value in Flowmeter?
Explain why use mmwc unit?
selection of the zener barrier for the hazardeous area zone 0
What are the materials available to prepare individually for competetive exams in Instrumentation field? Plz reply...
please any body have most important data for study for saudi aramco test of instrument QC thanks email shahnaveedullah@gmail.com
How to calibrate smoke Dectector
I was working on calibrating turbidity transmitters endress+hauser at effluent polishing plant.We calibrated using NTU buffers.What happened is that when we immersed the sensor, everytime we raise and lower the sensor gradually, the reading will vary.my question is that is there any specifications on what is the required distance from the bottom of the container with buffer to the face of the sensor?Is it ok to install the sensor in a medium which has turbulence specially if bubbles are present?
How does temperature bath work? How does coil gets heated only by applying some current?
Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
What is the basic difference between Modbus and CAN Open Protocols
Working principle of magnetic flow meter ......and calibration procedure of e+h magnetic flowmeter...
