Instrumentation engineering root cause analysis of pressure switch (PS) frozen screwed cover which extends the plant shutdown time.
Article Type: | Root Cause Analysis (RCA) |
Category: | Instrumentation |
Equipment Type: | Switches |
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.
K-901 NH3 Refrigeration Compressor tripped on Low-Low lube oil pressure though the oil header pressure was the set 1.4 bars. A large Al screwed cover housing contains the pressure switch (PS). The crew identified the PS’s micro-switch as defective and proceeded to change it.
The corrosion and oxides frozen stubborn Aluminium (Al) cover defied two hours long all possible violent unscrewing efforts including not permitted.
Finally, the crew took the below-listed steps:
Shop efforts are:
While the above shop tasks progressed, field Inst crew done jobs are:
Thus, a simple ½-hour task extended to 12 hours of lost ammonia production, despite well-coordinated done several tasks.
The above hard-way learning prompted taking the below-given recurrence prevention steps:
Thanks to these pro-active steps stuck screws and covers became history.
Author: S. Raghava Chari
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