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[MW:24717] Best Answers required.

By Materials & Welding
Dear Experts,

One of my friend sent me the following and asked me to find out the answers for the following case study.I request you all, pls study the same and give me the answer.Thanking you all for your help and advise.

With Best Regards

sampath

   
                                                                                        CASE STUDY


LNG tanks have submerged pumps that are used to recirculate and unload LNG from Storage Tanks.These pumps are Installed in a caisson that goes through the tank roof.
There is a bolted joint at the top of the caisson for Installation and accesses n to the pumps.It is found that LNG liquid leaked from the bolted joint during the startup of the pump.The liquid LNG flowed beneath the Insulation by passing the spill tray and leaked on to the carbon steel roof.


1. What will be the problem triggered by LNG liquid leakage onto Carbon Steel Roof? Why?

2.    What will be the immediate causes of the LNG liquid leaked from the bolted joint?

3.What is the control measure breakdown which caused LNG liquid leakage onto Carbon Steel Roof?

4.Based on above incident description, what is the possible causes technically which may contribute to this incident. I.e. LNG liquid leaked onto the carbon steel roof?

         5.  Please explain what is the recommended action to prevent the recurrence of this problem? Please explain in all aspects to minimize immediate cause and system cause as answered above). Please mention also applicable code and standard.

Your earliest reply on the above will be highly appreciated.Thanking you all once again.



 





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