When performing the five year internal inspection of a water storage tank, is it necessary to drain the water from the tank or can a qualified diver perform the necessary inspection?
In order to perform the required inspection and maintenance activities outlined in Chapter 9, the water is not required to be drained from the tank. A certified commercial diver can perform the inspection without draining water from the tank. In any case, the inspection should include verification that center columns of tubular design are not holding water, spot wet sponge testing and vacuum box testing to name a few.
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