The person in charge of cargo transfer may isolate automatic closing valves described in § 153.408(b) from a cargo containment system if the following conditions are met:

(a) The containment system carries products to which § 153.408 does not apply.

(b) The valves are isolated by:

(1) Removing the valves; or

(2) Installing removable pipes and blind flanges to by-pass the valves.