§154.1710. Exclusion of air from cargo tank vapor spaces.

46 C.F.R. § 154.1710

When a vessel is carrying acetaldehyde, butadiene, ethylene oxide, or vinyl chloride, the master shall ensure that air is:

(a)

Purged from the cargo tanks and associated piping before the cargo is loaded; and

(b)

Excluded after the cargo is loaded by maintaining a positive pressure of at least 13.8 kPa gauge (2 psig) by:

(1)

Introducing a gas that—

(i)

Is not reactive;

(ii)

Is not flammable; and

(iii)

Does not contain more than 0.2% oxygen by volume; or

(2)

Controlling the cargo temperature.

Notes, amendments, and revision history

Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.

Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.