Specialist repair shops only can handle, long handing to them time and their quoted very long repair times, very thin walled finned heat leaks stopped innovatively in-house to complete committed orders.
Article Type: | Root Cause Analysis (RCA) |
Category: | Mechanical |
Equipment Type: | Pipelines and Miscellaneous Problems |
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.
The 2500x1000x1000 mm huge fertilizers drying air heating finned tube air heater (FH) is akin to ‘50 Nos. car radiators package. 3.5 bar steam passing through tube bores raises the fan blown large volume air over tube fins to 80 to 85o C.
The hot air dries the conveyor belt conveyed phosphate fertilizers. Finned tube steam leaks rendered drying ineffective within 3 months of use.
Delivering the hard won against stiff international competition first NPK order demanded FH rush repair to avoid huge financial and image loss.
The below listed constraints made this also difficult, unresolvable, despairing problem (DDUDP)!
He stopped the leaks in-situ thus:
According to the sealant powder container printed information, 1-kg sealant powder 8-hour hot water circulation capillary action and surface tension attract the powder into the crevices and seal the pores and other leak paths effectively.
Gradual cooling to room temperature increases he seal strength. The author estimated the FH to be 50 car-radiators. Hence, the 50 pockets dumped into the FH filled condensate. It worked!
DDUDP solving benefits are:
Author: S. Raghava Chari
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