46 C.F.R. § 64.69
Location of the pressure relief device
A pressure relief device must be—
(a) Accessible for inspection and repair before stowage of the tank; and
(b) Attached so that escaping gas does not impinge on the tank or framework.
A pressure relief device must be—
(a) Accessible for inspection and repair before stowage of the tank; and
(b) Attached so that escaping gas does not impinge on the tank or framework.