Instrumentation engineering root cause analysis (RCA) of letdown valves repeat failures in industrial plant.
Article Type: | Root Cause Analysis (RCA) |
Category: | Instrumentation |
Equipment Type: | Control Valves |
Author: | S. Raghava Chari |
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.
As foreseen, within a week failed PCV 205 S shut down the plant chaotically.
Crew bolted the as soon as possible (ASAP) readied and carbon-steel flanges screwed valve PCV 205 to the pipeline and production resumed in 6 hours. The wisely screwed-in CS flanges reduced the downtime by 2 hours.
As before crew readied spare valve PCV 205S too ASAP and vigorously considered plug to stem strengthening.
Also Read: First Time Letdown Valve Problem
The SS 329 plug broke into two while welding to the stem. Hence, the author decided to use No Joint Inner Valve (NJIV) braving the below given two constraints and the valve maker not approving it.
Crew readied PCV 205 S with NJIV. However, it has become a non-moving spare!
A lasting and least-cost solution for a DDUDP.
The valve PCV 205 inspected at 3‑years intervals is excellent.
Author: S. Raghava Chari
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