46 C.F.R. § 64.19
External pressure
(a) A tank without a vacuum breaker must be designed to withstand an external pressure of 7
(b) A tank with a vacuum breaker must be designed to withstand an external pressure of 3 psig or more.
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(a) A tank without a vacuum breaker must be designed to withstand an external pressure of 7
(b) A tank with a vacuum breaker must be designed to withstand an external pressure of 3 psig or more.