§54.01-40. External pressure (modifies UG-28).
46 C.F.R. § 54.01-40
The exemption from external pressure consideration provided by the note under UG-28(f) does not apply.
Vessels which may at times be subjected to partial vacuum due to nature of the contents, temperature, unloading operations, or other facet of employment must either have vacuum breaker protection or be designed for not less than one-half atmosphere of external pressure.
Notes, amendments, and revision history
Amendments
[CGFR 70-143, 35 FR 19906, Dec. 30, 1970]
Authority
Authority: 33 U.S.C. 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.
Source
Source: CGFR 68-82, 33 FR 18828, Dec. 18, 1968, as amended by USCG-2020-0634, 89 FR 50104, June 12, 2024, unless otherwise noted.
Amendments
[CGFR 70-143, 35 FR 19906, Dec. 30, 1970]