§64.63. Minimum emergency venting capacity.
46 C.F.R. § 64.63
The total emergency venting capacity (Q) of the relief devices of an uninsulated MPT must be in accordance with table 1 to § 64.63 or the following formula based upon the pressure relief device operating at a pressure not to exceed the test pressure:
The total emergency venting capacity (Q) of an insulated portable tank may have a reduction if—
It is shown to the Coast Guard that the insulation reduces the heat transmission to the tank;
The present reduction of the emergency venting capacity (Q) is limited to the percent reduction of the heat transmission to the tank or 50 percent, whichever is less; and
The insulation is sheathed.
Notes, amendments, and revision history
Amendments
[CGD 73-172, 39 FR 22950, June 25, 1974, as amended by CGD 84-043, 55 FR 37410, Sept. 11, 1990; 55 FR 47477, Nov. 14, 1990; USCG-2020-0634, 89 FR 50199, June 12, 2024]
Authority
Authority: 46 U.S.C. 3306, 3703; 49 U.S.C. App. 1804; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.3.
Source
Source: CGD 73-172, 39 FR 22950, June 25, 1974, unless otherwise noted.
Amendments
[CGD 73-172, 39 FR 22950, June 25, 1974, as amended by CGD 84-043, 55 FR 37410, Sept. 11, 1990; 55 FR 47477, Nov. 14, 1990; USCG-2020-0634, 89 FR 50199, June 12, 2024]