| Space
| Minimum
required
rating
| Quantity and location
|
|---|
| Safety Areas
|
| Wheelhouse and control room | 20-B:C | 2 in the vicinity of the exit.
|
| Stairway and elevator enclosure | | None required.
|
| Corridors | 2-A | 1 in each corridor not more than 150 ft (45 m) apart. (May be located in stairways.)
|
| Lifeboat embarkation and lowering stations | | None required.
|
| Radio room | 10-B:C | 2 in the vicinity of the exit.
|
| Accommodations
|
| Staterooms, toilet spaces, public spaces, offices, lockers, small storerooms, pantries, open decks, and similar spaces | | None required.
|
| Service Spaces
|
| Galleys | 40-B:C | 1 for each 2,500 sq ft (232.2 sq m) or fraction thereof suitable for the hazards involved.
|
| Paint and lamp rooms | 40:B | 1 outside each room in the vicinity of the exit.
|
| Storerooms | 2-A | 1 for each 2,500 sq ft (232.2 sq m) or fraction thereof located in the vicinity of the exits, either inside or outside the spaces.
|
| Workshop and similar spaces | 20-B:C | 1 outside each space in the vicinity of the exit.
|
| Machinery Spaces
|
| Oil-fired boilers: Spaces containing oil-fired boilers, either main or auxiliary, or their fuel oil units | 40-B | 2 required in each space.
|
| | 160-B | 1 required in each space. See note 1.
|
| Internal combustion or gas turbine propelling machinery spaces | 40-B | 1 for each 1,000 brake horsepower but not less than 2 and not more than 6 in each space.
|
| | 120-B | 1 required in each space. See note 1.
|
| Motors or generators of electric propelling machinery that do not have an enclosed ventilating system | 40-B:C | 1 for each motor or generator.
|
| Motors and generators of electric propelling machinery that have enclosed ventilating systems | | None required.
|
| Auxiliary Spaces
|
| Internal combustion engines or gas turbine | 40-B | 1 outside the space containing engines or turbines in the vicinity of the exit.
|
| Electric emergency motors or generators | 40-B:C | 1 outside the space containing motors or generators in the vicinity of the exit.
|
| Steam driven auxiliary machinery | | None required.
|
| Trunks to machinery spaces | | None required.
|
| Fuel tanks | | None required.
|
| Miscellaneous Areas
|
| Helicopter landing decks | 160-B | 1 at each access route.
|
| Helicopter fueling facilities | 160-B | 1 at each fuel transfer facility. See note 2.
|
| Drill floor | 40-B:C | 2 required.
|
| Cranes with internal combustion engines | 40-B:C | 1 required.
|
| Spare Units
|
| | 2-A | 10 percent of the total required rounded up.
|
| | 40-B:C | 10 percent of the total required rounded up.
|