- (a) A check valve must be provided between each cylinder and manifold or distribution piping. The valve must be permanently marked to indicate the direction of flow.
- (b) If the same cylinder is used to protect more than one space, normally, closed stop valves must be provided to direct the agent into each protected space.
- (c) Each cylinder must be fabricated, tested, and marked in accordance with 46 CFR 147.60(b) and 49 CFR part 180.
(d) The cylinders in a common manifold must be:
- (1) Of the same size;
- (2) Filled with the same amount of agent; and
- (3) Pressurized to the same working pressure.