![]() ![]() Emergency Fire pump cargo ships machinery spaces.The maximum charging pressure is always stamped on either the neck or the shoulder of a cylinder. Some types are charged to as high as 300 bar (4500 p.s.i.). The fully charged pressure of cylinders also varies. The liquefied Halon is usually pressurised in the cylinders with nitrogen in order to increase the speed of discharge.Ĭompressed air cylinders are of various sizes, usually of either 9 or 6 litre water capacity. Large quantities suitable for fire extinguishing can be obtained by burning fuel in carefully measured amounts or by cleaning the exhaust gases from a boiler.Ī Halon storage system would be very similar to one using carbon dioxide except that fewer cylinders would be required. Inert gases are those which do not support combustion and are largely nitrogen and carbon dioxide. When released the CO 2 is distributed throughout the compartment, so diminishing the relative oxygen content and rendering the atmosphere inert. CO2 fire extinguishing installations for machinery spacesįire extinguishing installations employing CO 2 stored under pressure at ambient temperature are extensively used to protect ships' cargo compartments, boiler rooms and machinery spaces.Violent agitation of the mixture in air creates air bubbles in the foam. Mechanical foam is the usual substance used, being produced by mixing foam making liquid with large quantities of water. Automatic foam induction system for machinery space fireįoam spreading systems are designed to suit the particular ship's requirements with regard to quantity of foam, areas to be protected, etc.This system may be used in accommodation areas, and in machinery spaces with certain variations in the equipment used and the method of operation. The automatic spray or sprinker system provides a network of sprinkler heads throughout the protected spaces. Automatic water spray & water mist system for machinery protected area.Air supply trunkings are not only a source for a supply of oxygen to feed the fire but also have potential for carrying smoke from one area to another. Of the three factors, oxygen is provided in large quantities in machinery spaces, accommodation, dry cargo holds and tanker pumprooms by ventilation fans. The more general installations will now be outlined.Īn outbreak of fire requires a source of ignition, the presence of combustible material and ample oxygen. Which are specifically designed for certain types of ship. A capsule ofĬarbon dioxide gas is located beneath a plunger mechanism in theĪ very strong container is used to store liquid carbon dioxide underĪ variety of different fixed fire fighting installations exist, some of The outer container contains sodium bicarbonate powder. Inner polythene container is filled with aluminium sulphate The main container is filled with sodium bicarbonate solution and a long The screw-on cap contains a plunger mechanism covered by a safety The container of this extinguisher holds a sodium bicarbonate solution. These are the soda-acid, foam, dry powder and carbon dioxide There are four principal types of portable extinguisher usually found onīoard ship. ![]() ![]() Operate the control system and expel the gas. Used with cylinders of carbon dioxide and compressed air being used to Halon is usually pressurised in the cylinders with nitrogen in order to Please contact us if you need further assistance.A Halon storage system would be very similar to one using carbonĭioxide except that fewer cylinders would be required. Therefore, those Halon 1211 fire extinguishers with a UL class A rating are permitted to be used on class A hazards. The OSHA fire protection standards permit the use of any fire extinguisher for use on class A hazards if the extinguisher has received a class A rating from UL. Since that time however, and as you correctly noted, some Halon 1211 fire extinguishers have recently received a class A rating from UL. This is in response to your inquiry concerning the revised fire protection standards of the Occupational Safety and Health Administration (OSHA) with respect to the use of Halon 1211 fire extinguishers for class A hazards.Īt the time OSHA was preparing the final rule for its fire protection standards, Halon 1211 fire extinguishers had not yet received a class A rating from UL. ![]()
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