[MW:27193] Regarding vacuum check while dewatering during hydro test of storage tanks

Dear Experts,

Kindly give the reason why we do vacuum ensure while dewatering of contaminated rain water storage tank  during hydro test 12 mtrs dia. And 15 metres height.

Your immediate reply will be highly appreciated and help in time. 

Thanks & Best Regards, 

Pavankumar Reddy.

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