46 C.F.R. § 98.33-11
Smoking
No person may smoke when—
(a) Within 50 feet of a portable tank or IBC containing a combustible liquid; and
(b) On the deck where the tank or IBC is stowed.
No person may smoke when—
(a) Within 50 feet of a portable tank or IBC containing a combustible liquid; and
(b) On the deck where the tank or IBC is stowed.