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The manufacturers recommendation for the storage of the foam agent shall be observed.
P.5.2 Non pressurized foam tank
The foam tank shall be adequately designed to allow for the thermal expansion of the foam concentrate.
The foam tank shall have a venting, a level gauge and means to prevent overfilling.
Means for servicing and inspecting the inside of the tank shall be provided. Foam storage tank shall be
constructed of a material that is compatible with the foam concentrate. Foam concentrate manufacturer
shall be consulted for compatible materials.
Connections for filling and draining shall be fitted. The fill and suction pipes shall end above the tank
bottom. The volume under the suction pipe shall not be taken account by calculating the tank volume.
The suction pipe may end at the tank bottom of tanks only if they are manufactured of reinforced glass
fibre, or equivalent or corrosion resistant steel and if the foam agent is a sediment free and synthetic
type.
P.5.3 Pressurized foam tank
Pressurized foam tanks (bladder tanks) shall be fitted with means for filling, draining, venting, measuring
of the fill level, cleaning and controlling of the tank inside. Pressurized foam tanks shall be designed and
constructed per a recognized standard for pressure vessels.
Pressurized foam tanks shall incorporate a concentrate control valve near the foam injection device.
An operation manual shall be provided. The recommendation shall be followed for all works.
Pressurized foam tanks cannot be refilled during operation of the extinguishing activity. Pressurized foam
tanks shall be inspected and tested per manufacturers recommendations and the pressure equipment
directive. The integrity of the bladder shall be tested for leaks on an annual basis. The quantity of foam
agent may be stored in more than one pressurized foam tank. If the quantity of foam agent is stored in
more than one pressurized foam tank, piping of equal pressure loss supplying the bladder tank and
piping of equal pressure loss discharging from the bladder tank to the foam injection device shall be
maintained.
P
P.6 Foam agent and water foam pipe-work
Components and pipes filled with foam concentrate at any time shall not influence the performance
characteristics of the foam agent. Only materials compatible with the foam concentrate shall be utilized in
the foam concentrate supply line to the foam injection device or system.
The filling of the foam pipes upstream of the foam injection device with foam agent shall be
achieved within 10 seconds or the pipes shall continuously be filled with foam agent. If the foam agent
pump and the foam injection device are filled at all times with foam agent they shall be made of
corrosion resistant materials that are compatible and suitable as pressurized piping.
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