Gas lock Definition

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Gas lock:

1.

A condition sometimes encountered in a pumping well when dissolved gas, released from solution during the upstroke of the plunger, appears as free gas between the valves.

If the gas pressure is sufficient, the standing valve is locked shut, and no fluid enter the tubing.

2.

A device fitted to the gauging hatch on a pressure tank that enables manual dipping and sampling without loss of vapor.