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Damaged sieve trays

Q: It is urgent to know the main reason why our top sieve tray in the extractor is damaged. Its function is to extract mercaptan in LPG with a caustic, but during annual shut-down it is shown that the top trays are damaged. I need to know the main reason for the damaged sieve trays.

A: My first thought is that the column may have lost control of pressure. They should go back and look closely at their process history. The loss of pressure could have resulted in boiling which is the only way I can see the trays being damaged.

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