46 C.F.R. § 64.65 Vacuum relief device.
Title 46 - Shipping
(a) Each MPT that is designed for an external pressure of less than 7.5 psig must have a vacuum relief device. (b) A vacuum relief device for an MPT must— (1) Open at an external pressure of not less than 3 psig; and (2) Have an opening with a cross-section of 0.44 square inch or more. [CGD 84–043, 55 FR 37410, Sept. 11, 1990]
Title 46: Shipping
PART 64—MARINE PORTABLE TANKS AND CARGO HANDLING SYSTEMS
Subpart C—Pressure Relief Devices and Vacuum Relief Devices for MPTs
§ 64.65 Vacuum relief device.
