Foam Fire Extinguisher

Product Details:

• The main container is filled with sodium bicarbonate solution and a long inner polythene container is filled with aluminium sulphate. The inner container is sealed by a cap held in place by a plunger. When the plunger is unlocked by turning it, the cap is released. The extinguisher is then inverted for the two liquids to mix. Carbon dioxide is produced by the reaction which pressurises the container and forces out the foam.

Al2 (SO4)3 + 6 NaHCO3  -> 2Al (OH) 3 + 3Na2SO4 + 6 Co2

• The chemicals react to form Co2 which serves as propellant, but the action is slower, giving time for bubbles to form. Foam-making substances added to the sodium carbonate determine the nature of the foam formed. The ratio of the foam produced to liquid is in the order of 8:1 to 12:1.
• Because the extinguisher has to be inverted for operation, no internal pipe is fitted. When being recharged the cap seal should be examined and the pressure relief holes in the rim checked. The chemical foam extinguisher may be slow.

Construction Details

• A 9 litre portable foam fire extinguisher of the inverting type as shown in both the pictures above. The inner and outer containers are made of lead or zinc coated steel. The outer containers is of riveted construction.
• Cap and nozzle is made of brass and a loosely fitting lead valve may be situated at the top of the inner container to provide a seal. The brass cap has a series of small radial holes drilled trough it which communicate the inside of the extinguisher with the atmosphere when the cap is being unscrewed, hence these holes serve as a vent if the nozzle is blocked.

Internal Contents of the Extinguisher

• The inner container is filled with a solution of aluminium sulphate and the annular space formed by the inner and outer container is filled upto the level indicator with a solution of sodium bi carbonate and foam stabilizer.
• Proportions of solutions approximately 1:3 inner and outer containers respectively, total solutions volume is 9 litres.

Product Details:

We are one of the leading manufactrers in fire extingusher and fire safety products and we also deal in fire fighting system installation services and we believe to serve better to our customers. Fire extinguisher, portable or movable apparatus used to put out a small fire by directing onto it a substance that cools the burning material, deprives the flame of oxygen, or interferes with the chemical reactions occurring in the flame