Control Valves Leak Tightness Restoration Pose Difficulties

Instrumentation engineering root cause analysis (RCA) of control valves leak tightness restoration pose difficulties in the plant.

Note: This root cause analysis (RCA) is from real-time scenarios that happened in industries during the tenure of two or three decades ago. These articles will help you to improve your troubleshooting skills and knowledge.

Control Valves Leak Tightness Problem

Restoring many control valves leak tightness was a lengthy and efforts intensive lapping task, yet results were not reliable.

Author solution

Extending the lens ring gasket’s line contact idea the author got the plugs’ seating areas machined to 100^o and seats’ to 90^o and advised the crew to set control valves (CVs’) actuators exert 0.9 Kg thrust / mm seat dia.

The valves were leak-tight and they remained leak-tight a lot longer than lapped valves.

Benefits of this solution

Few minutes of machining achieve leak tightness and it stays leak-tight for years.

Author: S. Raghava Chari

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