46 CFR § 154.1405
Respiratory protection
April 15, 2021
When Table 4 references this section, a vessel carrying the listed cargo must have:
(a) Respiratory protection equipment for each person on board that protects the person from the cargo vapor for at least 5 minutes; and
(b) Two additional sets of respiratory protection equipment that:
(1) Are stowed in the wheelhouse; and
(2) Protects the wearer from the cargo vapor for at least 5 minutes.