What is the recommended procedure to shut in a meter during an AOC?

What is the recommended procedure to shut in a meter during an AOC?

• A. Close the upstream shutoff valve to isolate the meter, verify there is no flow, and document, escalating as required.
• B. Open the upstream valve to relieve pressure.
• C. Disconnect power to the meter.
• D. Close the downstream valve only and leave the upstream open.

Answer: (A)

During an AOC, the goal is to stop flow into the meter by isolating it from the source. Closing the upstream shutoff valve achieves a full isolation, preventing any further entry of gas or liquid into the meter. After isolating, you verify there is no flow using indicators or gauges and then document the action and escalate per procedure. This approach protects the meter, downstream equipment, and personnel and creates a clear record for response. Opening the upstream valve would relieve pressure but doesn't isolate the meter, so flow could continue. Disconnecting power to the meter stops measurement but does not stop the flow or isolate the meter. Closing only the downstream valve leaves the meter connected to the upstream supply, so flow could still enter the meter.

During an AOC, the goal is to stop flow into the meter by isolating it from the source. Closing the upstream shutoff valve achieves a full isolation, preventing any further entry of gas or liquid into the meter. After isolating, you verify there is no flow using indicators or gauges and then document the action and escalate per procedure. This approach protects the meter, downstream equipment, and personnel and creates a clear record for response.

Opening the upstream valve would relieve pressure but doesn't isolate the meter, so flow could continue. Disconnecting power to the meter stops measurement but does not stop the flow or isolate the meter. Closing only the downstream valve leaves the meter connected to the upstream supply, so flow could still enter the meter.