HD MODEL FCA FOAM CHAMBER
Description
Foam Chamber is an air aspirating foam discharge device, covering wide range of flow from 75 to 3300 litres per minute at 2.8 to 7 kg/sq.cm. inlet pressure.
The Foam Chamber contains a vapour seal to prevent the entry of fuel vapour into the foam chamber and the foam solution pipe. Each foam chamber is supplied with an orifice plate, designed for the required flow and inlet pressure. The orifice is field replaceable in the event of change in design parameters.
Foam is produced by introducing air into the foam solution stream. The inlet of foam chamber is designed to create venturi jet which draws air into the foam solution stream. Air is drawn into the foam solution through the holes located on the foam chamber covered with stainless steel screen to exclude nesting birds and insects. The aerated foam is directed into the deflector for the gentle application of the expanded foam. The deflectors are available in different models.
Removal of cover plate from the top of the chamber allows the system to be tested and a sample of the expanded foam can be collected without removing the vapour seal or disconnecting the foam chamber from the tank. Frangible glass bursting disc/graphite (vapour seal) can be replaced easily.
The vapour seal is designed to rupture within 0.7 to 1.75 kg/sq.cm (10 to 25 psi) pressure at inlet flange of Foam Chamber, as required by NFPA, UL & FM standard. The vapour seal will withstand maximum back pressure of 0.07 kg/sq.cm (1.0 psi) or equal to 686 mm of water column as specified by API for welded storage tank. If the requirement exceeds 0.07 kg/sq.cm (1.0 psi) as in case of nitrogen blanketing system, then this equipment may not be suitable.
The vapour seal is frangible glass. Vapour seal is supplied with holder and for spares it can be with or without holder. The ‘O’ ring used for seal are Nitrile Rubber and optional Viton is recomended for polar solvent.
Foam is produced by introducing air into the foam solution stream. The inlet of foam chamber is designed to create venturi jet which draws air into the foam solution stream. Air is drawn into the foam solution through the holes located on the foam chamber covered with stainless steel screen to exclude nesting birds and insects. The aerated foam is directed into the deflector for the gentle application of the expanded foam. The deflectors are available in different models.
Removal of cover plate from the top of the chamber allows the system to be tested and a sample of the expanded foam can be collected without removing the vapour seal or disconnecting the foam chamber from the tank. Frangible glass bursting disc/graphite (vapour seal) can be replaced easily.
The vapour seal is designed to rupture within 0.7 to 1.75 kg/sq.cm (10 to 25 psi) pressure at inlet flange of Foam Chamber, as required by NFPA, UL & FM standard. The vapour seal will withstand maximum back pressure of 0.07 kg/sq.cm (1.0 psi) or equal to 686 mm of water column as specified by API for welded storage tank. If the requirement exceeds 0.07 kg/sq.cm (1.0 psi) as in case of nitrogen blanketing system, then this equipment may not be suitable.
The vapour seal is frangible glass. Vapour seal is supplied with holder and for spares it can be with or without holder. The ‘O’ ring used for seal are Nitrile Rubber and optional Viton is recomended for polar solvent.