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PLS TELL ME THE FUNCTION OR PRINCIPLE OF CREEP RELEIF
VALVE..
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Answer Posted / ramdas a. wani
I have checked the correct answer. The creep valves are
safety valves installed in gas lines downstream of the PCV
( pressure control valve ) When the PCV is unable to
maintain the downstrem pressure and it exceeds a set limit
the creep safety vlave releives the excess pressure and
maintains the line pressure.
The defination is also given in the petroleum and natural
gas regulatory board notification of 2006 ( 19 of 2006)
| Is This Answer Correct ? | 20 Yes | 0 No |
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
