Introduction : The fireman needs to be familiar with the equipment, fittings installed, to protect the buildings by means other than the use of water and also with the media used in these installations. The installations described include those which use foam, carbon-dioxide, vaporizing liquids and dry powder. 2. Foam Installations (LX) : (A) Pump operated mechanical foam installation: This type comprises a foam concentrate tank outside the area to be protected, the capacity being dependent on the area involved. The tank has a water supply and an inductor fitted on it. The water control valve is opened until required amount of water is flowing into the tank. The "venture effect" created in the inductor draws the resultant mixture of foam concentrate and water from the tank through the non-return valve. The foam solution is then delivered to foam generators within the protected area, where foam in formed and conveyed to the spreaders or p
Introduction : Underground structures are characterised by the fact that their outer walls are tightly joined to the soil. Those being deeper than one floor beneath the ground normally have neither celler windows nor outside of the use of the vertical passages such as stairways and elevators. The inaccessibility of underground structures due to smoke generation in the event of fire results in some unique problems and difficulties. Primary among these are: a) Difficulty in venting smoke, heat and toxic products of combustion. b) Difficulty in fire fighting and evacuating occupants. c) Difficulty in making any appraisal of the fire conditions or about whereabouts of the fire itself. d) Difficulty in communication between personnel below ground and also between persons on the surface and below ground. e) Difficulty in effectively applying extinguishing media. f) Unusual congestion and restriction of movement in the interior of the underground space. CLICK HERE👉 Undergr