We have a couple of oil tanks at our plant. One of them does not have a lightni

We have a couple of oil tanks at our plant. One of them does
not have a lightning arrester installed. My question is it
necessary to install an arrestor on every tank or will this
particular one be covered by the arrestor installed on the
ajdacent tank, Since all the tanks are close to each other.

Basically, I want to know that if these arrestors or
protection works in a parituclar area of effect or influence.

Thanks

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