46 CFR § 153.371
Minimum relief valve setting for refrigerated cargo tanks
April 15, 2021
The relief valve setting for a containment system that carries a refrigerated cargo must at least equal the lesser of:
(a) That in §153.370; or
(b) 110 percent of the cargo's vapor pressure at the steady state temperature obtained by a full tank of cargo with the refrigeration system operating under ambient conditions described within the definition of a refrigerated tank in §153.2.