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§153.964 Discharge by gas pressurization.
The person in charge of cargo transfer may not authorize cargo discharge by gas pressurization unless:
(a) The tank to be offloaded has an SR or PV venting system;
(b) The pressurization medium is either the cargo vapor or a nonflammable, nontoxic gas inert to the cargo; and
(c) The pressurizing line has:
(1) A pressure reducing valve whose setting does not exceed 90% of the tank's relief valve setting and a manual control valve between the pressure reducing valve and the tank; or
(2) For an inert gas medium:
(i) A safety relief valve with a cross sectional flow area at least equal to that of the pressurizing line and whose relieving pressure does not exceed 90 percent of the tank's relief valve setting;
(ii) A manual control valve between the safety relief valve and the tank; and
(iii) A check valve between the manual control valve and the tank.