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How to isolate a DPT from line in the condition that process
must not be disturbed,and process is also critical and no
bypass is available.?
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Answer Posted / muhammad arsalan afzal
isolate the transmitter from the main isolation valve and
follow this procedure.
First of all
1= Close high pressure manifold valve
2= open the equilizing valve
3= than close the low pressure manifold valve.
Mostly we we open equilizer valve when we are isolating
the tx. but what will happen if we close high side pressure
valve before equilizing valve? applied process Pressure is
already there on both sides of the transmitters no extra
pressure will be exerted on the tx because we are only
closing the valve. DP cell demage only in that case if we
purge high or low side before closing the manifold
isolation valves and we start closing the valve without
opening the equilizer.
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