46 C.F.R. § 154.503

Where thermal movement and movements of the cargo tank and the hull structure may cause stresses that exceed the design stresses, the piping and piping system components and cargo tanks must be protected from movement by:

(a) Offsets;

(b) Loops;

(c) Bends;

(d) Mechanical expansion joints including:

(1) Bellows;

(2) Slip joints;

(3) Ball joints; or

(e) Other means specially approved by the Commandant (CG-ENG).