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Mechanical Foam, Dry Chemical Powder, Holon Extinguisher

Mechanical Foam Extinguisher:

These extinguishers are identical in appearance and construction to SODA ACID type of extinguishers, the only exceptions that instead of acid phia the see extinguishers. are provided with C02 cartridge which is screwed to the cap of the extinguisher, the C02 cartridge has a sealing disc. The plunger has a piercing type nail attached to it in such a way that it will puncture the sealing disc of C02 cartridge when pushed down. The operation recharging, maintenance testing &labelling procedures are same as for water type (CO2 Gas Expelled) Extinguisher.

Capacity:

Portable- 9 Litre.

Mobile – 50 Litre, 150 Litre.

There are two types of this extinguishers based on their position for operation.

Upright type:

These are provided with a dip pipe (siphon tube) attached to the outlet poin with or without a discharge hose pipe.

Invertible type:

There is no dip pipe in this type of extinguishers and no discharge pipe is provided.

Application: Class a fires involving ordinary solid carbonaceous fuels.

Capacity:

Portable 9 Litre

Mobile- 50 Litre, 150 Litre.

Operation:

Upright type:

  • Remove the safety Clip.
  • Remove from the wall/stand mountings by holding the top handle with the left hand.
  • Place it on ground at 6 meter or less from the scene of fire.
  • Hold the pipe in left hand and press the knob hard enough to puncture the Co2 cartridge seal disc.
  • Direct the jet at the base of the fire by lifting the extinguisher with right hand. Move around the fire to extinguish the last clinker. Use the entire contents of the extinguisher .
  • Place the empty extinguisher in the horizontal position after use.

Invertible type:

See Soda Acid Type Extinguisher Operation.

Performance:

At pressing the knob, C02 gas cartridge gets punctured. CO2 gas pressurizes the extinguisher up to 6 to 7 kg/cm2pressure. The water in the outer vessels thrown out through the squeeze nozzle. The throws about 20 feet for the first minute and 95% of the total water comes out in 2 minutes.

Recharging:

  • Open the cap.
  • Clean the extinguisher and its parts thoroughly.
  • Pour clean watering the container up to maximum filling mark.
  • Replace C02 cartridge with a new one.

Tests:

  • Check one in three months/Inside & Outside of container for any corrosion or erosion.
  • Check the weight of CO, cartridge. Replace if the loss is more10%. The weight is marked on neck of every cartridge.
  • Check all movable parts for their free movement. Check discharge performance once every year.
  • Test the container hydraulically at 25 kg /cm2 pressure and the tube if fitted, once 4 years.

Labelling:

Every extinguisher must be dearly labelled in a permanent manner to indicate

  • The name of the manufacturer
  • Capacity
  • Year of manufacture
  • Method of Operation
  • The class of Fire.

Dry Chemical Powder Extinguisher (Gas Cartridge Type):

The extinguisher is cylindrical in shape, made of solid drawn steel cylinder. It has a removable internal shell having gas pores and is protected with thin rubber rings and rubber washer at its neck. The nozzle is protected with a rubber cap against entry of moisture. The ex-pell is C02 gas in a cartridge which is seal. The CO2 gas cartridge screwed to the operating head which is fixed with a piercing mechanism.

Application:

All classes of fire except 0 class which require special composition of powders.

Capacity:

Portable:- 1 kg, 2 kg, 5 kg, 10 kg

Mobile:-  22. 5/25 kg, 50 kg, 75 kg, 150 kg. 200 kg, 250 kg; 300 kg, 500 kg.

Operation:

Step – 1:

Remove the safety clip.

Step – II:

Withdraw rubber cap from the nozzle.

Step – III:

Hold the squeeze (the lever of) nozzle valve in open position.

Step – IV:

Press the plunger and direct the powder into the flame with a fast sweeping motion.

Performance:

At the press of the plunger, the C02cartridge gets punctured. C02gas released to pressurize the extinguisher up to 7 Kg/cm2pressure. The powder in the outer body pushed out through the nozzle.

Recharging:

  • Recharging should be done on a sunny day with least humidity in the air.
  • Clean the extinguisher body and other parts’ thoroughly.
  • Make the body as dry as possible before filling after unscrewing the cap.
  • Fill the outer vessel with recharge powder as supplied by the supplier in quantities according to the size of the extinguisher.
  • Place the inner vessel with co2cartridge in the outer vessel.

Screw back the cap after applying a little grease on the threading the charge composition varies as follows:

Testing:

  • Gas Cartridge should be weigh once in 3 months The extinguisher should be open and check against plugging of nozzles, siphon tube, washers, went holes etc. Periodically.
  • Check all moveable parts for their free movement periodically.
  • Body should be hydraulically tested at 25 kg/cm2 once in every four years.

Charge Composition:

Normal DCP Extinguisher

  • Sodium Bicarbonate – 97%
  • Magnesium Stearate – 1%
  • Magnesium Carbonate – 1.5%
  • Calcium Phosphate – 1/2%

Special Powders (For ‘D’ Class Fires)

  • Bitumen – 45%
  • Sewage Powder – 45%
  • Aluminium Sulphate – 10%
  • Sodium Chloride – 20 %
  • Potassium Chloride – 29%
  • Barium Chloride – 51%

Labelling:

Every extinguisher must be clearly labelled in a permanent manner to indicate

  • The name of the manufacturer.
  • Capacity.
  • Year of manufacture.
  • Method of Operation The class of Fire.

Holon Extinguisher:

Halon 1211 (BCF) pressurized extinguishers used for fires on electrical / electronic equipment. These extinguishers can be used on Class A, Band C fires It is virtually non-corrosive and non-abrasive. It is at least twice as effective on Class B fires as carbon-dioxide, compared on weight of agent basis. The extinguishing media contained in these extinguishers is hydrocarbons in which one or more hydrogen atoms have been replaced by atoms from halogen series: fluorine, chlorine, bromine or iodine. The substitution confers not only no flammability but also flame extinguishing properties to any of the resulting compounds.

Capacity:-

Portable- 9 Litre

Mobile- 50 Litre, 150 Litre.

Method of Operation:

The extinguishing must be operated and applied to fire in the same way as C02 extinguisher.

Application:

It is suitable for Class K/Class B/Class C fire. Here 1% AFFFF solution added to extinguisher.

Storage of Extinguishers in Open Area:

Fire extinguishers should be placed in fiber glass or metal cabinets in such a way that their bottom is 750 mm above the ground level.

Where cabinets or shades used to house the extinguisher in the open, these should be so designed that removal of the see extinguishers are not hampered in an emergency.

Storage of Extinguishers Inside and Under Cover:

Fire extinguishers, whether hung on brackets or kept on shelves, their bottom should be about 750 mm above the floor level. In no case a fire extinguisher should be placed in a position where it is likely to gain heat from the surrounding equipment or the process.

Maintenance, Inspection and Testing:

Routine maintenance, Inspection and testing of all fire extinguishers in respect to mechanical parts, extinguishing media and expelling means could be carried out by properly trained personnel at frequent intervals at least once in a month to make sure that these are in their proper working condition and have not been accidentally discharged or lost pressure or damaged. Following procedure should be follow for monthly maintenance, inspection and testing.

  • Clean the exterior of the extinguisher, polish the painted position with wax, and polish the brass parts with metal polish, chromium plated parts with silver polish.
  • Check the nozzle outlet and vent holes and the threaded portion of the cap for clogging and ensure that the plungers in fully extended position and is clean.
  • Check the cap washer, grease the threads of cap plunger rod and wipe clean.
  • Make sure that the extinguisher is in proper condition and is not accidentally discharger.
  • Check all mechanical parts thoroughly.

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