Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-08-01
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Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-08-01: Discussion question: 193. What are the steps to deactivate a differential pressure transmitter?
For differential pressure transmitters with complete piping systems, to shut down completely from the operating state: open the balance valve； Close the positive pressure valve ； Close the negative pressure valve ； Close the two root valves ； Open the two drain valves ； Close the two drain valves ； Stop powering the transmitter.
Open the balance valve； Close the positive pressure valve ； Close the negative pressure valve ； Close the two root valves ； Open the two drain valves ； Close the two drain valves ； Stop powering the transmitter.
Close the shut-off valve, then open the balance valve for drainage, and then shut it down
Close the positive pressure tap valve, open the balance valve, close the negative pressure tap valve, and finally close the root valve.
Close the negative pressure valve, open the balance valve, close the positive pressure valve
Open the balance valve, close the negative pressure side, and close the positive pressure side.
Open the balance valve； Close the positive pressure valve ； Close the negative pressure valve ； Close the two root valves ； Open the two drain valves ； Close the two drain valves ； Stop powering the transmitter.
Open the balance valve, close the negative pressure side, and close the positive pressure side.
For a differential pressure transmitter with complete piping, to bring it completely out of service: open the balance valve; close the positive pressure valve; close the negative pressure valve; close the two root valves; open the two drain valves; close the two drain valves; cut off power to the transmitter.