Red Seal Instrumentation And Control Technician Practice Questions - Red Seal Instrumentation And Control Technician (Interprovincial) Exam

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When draining a differential-pressure transmitter manifold connected to a high-pressure steam line, the correct sequence to take the transmitter out of service is to first:

Open the equalizing valve, then close both isolating (block) valves Close both block valves, open the equalizing valve, then open the vent/drain Open the vent valve before closing any block valve Loosen the process flange bolts to relieve pressure

Correct Answer:

Close both block valves, open the equalizing valve, then open the vent/drain

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