46 CFR 64.63
§ 64.63 Minimum emergency venting capacity.
United States · 46 CFR — Shipping · Status: effective
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- Citation
- 46 CFR 64.63, § 64.63 Minimum emergency venting capacity, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/225443
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Full text
(a) 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:
(b) The total emergency venting capacity (Q) of an insulated portable tank may have a reduction if—
(1) It is shown to the Coast Guard that the insulation reduces the heat transmission to the tank;
(2) 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
(3) The insulation is sheathed.
Table 1 to § 64.63—Minimum Emergency Venting Capacity in Cubic Feet: Free Air/Hour
[14.7 lb/in2 a and 60 °F]
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.