Interested to Buy Any Domain ? << Click Here >> for more details...
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
if in a level tx height is given, how u calculate the ranges of the tx?
what is gas metering system? gas chromatograph? and gas compressors?
what is controlling card in dcs? how u measure dcs memory?what is bus in dcs?how u know dcs speed n ehternet speed?
Draw a complete P&ID of a flow suction tank indicating all control & protection equipment. Indicate all its inlets and outlets. Explain the controls for this system
Why does a pressure gauge installed on reactor, doesn't have any vent line below to release the pressure? Is it any kind of designing mistake or it actually does not require any vent line? And if it does not require any vent line below it then how we are gonna release the pressure built inside the pressure gauge?
How to regulate the flow of Air in 4" line, with max flow of 330 nm3/hr and Pressure of 0.5 bar? please suggest the type of instrument required.
Speedtronic system .
What is the use of GMV in turbine?
How many ohms are required for proper earthing?
Why even multiple power supplu r used in instrumentation system?
Yokogawa CENTUMVP R6.09 unable to download to Engineering Station with ExaOPC R3.75
The issue is when I try to download the common project section to the Engineering Station (STN) from the HIS in System View, it is unable to connect. The error displayed is:
WARNING: Could not connect to equalize destination. (7001)
Retrying. Number of retries = 0/1
ERROR: LdXopsLoadMain: connect error 10060
ERROR: Processing terminated due to connection error. (7002)
Equalization end with errors. STN0149
---- ERROR = 2 WARNING = 1 ----
Background:
>Updated the ExaOPC software on the STN from 3.60 to 3.75
>STN operating system is Windows Server 2008 R2
>HIS operating system is Windows Server 2016 Stanard
Solutions attempted include:
>Ensuring all IP addresses are correct and all networked devices can be pinged.
>The ability to ping a device using its host name from another device (
Can anyone send most commonly asked interview question in Oil & Gas industry
How to calibrate RC Feeder system in thermal power station?,If any instrument available to calibrate it,ple inform me. make:stock,
which processor is used in dcs.
what does the ratio 800-400-300-200/1-1-1-1-1 in the specification of current transformer indicates?
