46 C.F.R. § 64.19Download PDFCurrent through September 30, 2024Section 64.19 - External pressure(a) A tank without a vacuum breaker must be designed to withstand an external pressure of 71/2 psig or more.(b) A tank with a vacuum breaker must be designed to withstand an external pressure of 3 psig or more. 46 C.F.R. § 64.19