Section 154.701 - Cargo pressure and temperature control: GeneralExcept as allowed under § 154.703 , cargo tanks must:
(a) Have their safety relief valves set at a pressure equal to or greater than the vapor pressure of the cargo at 45 °C (113 °F) but not greater than the MARVS under § 154.405 ; or(b) Be refrigerated by a system meeting § 154.702 , and each refrigerated incompatible cargo refrigerated by a separate system.