46 CFR §34.20-10

1. (a)The foam agent, its container, measuring devices, and other items peculiar to this system shall be of an approved type.
2. (b)The foam agent container and the main controls for operating the system shall be located in a protected space not likely to be made inaccessible in the event of a fire in any portion of the cargo area.
3. (c)Complete, but simple instructions for the operation of the system shall be located in a conspicuous place at or near the controls.
4. (d)All valves shall be marked as required by § 35.40-17.
5. (e)The deck foam system on each tankship that has a keel laying date on or after January 1, 1975, must be capable of being actuated, including introduction of foam to the foam main, within three minutes of notification of a fire.