Sch 2Non-portable froth fire extinguishers

Schedule 2 Non-portable froth fire extinguishers

(regulations 61 (1))

1. In this Schedule, ‘froth fire extinguisher’ does not include a portable fire extinguisher.

2. A froth fire extinguisher shall be so designed and constructed that the interior of the extinguisher can be examined.

3. The body of a froth fire extinguisher shall be cylindrical with ends dished outwards, without reverse flanging, to a radius not exceeding the diameter of the body.

4. The body and ends of a froth fire extinguisher shall be made of sheet steel and shall be tinned or lead-coated internally and every part of the extinguisher shall, where necessary, be protected against corrosion.

5. The body of a froth fire extinguisher shall be welded or riveted and all riveted joints shall be soldered.

6. (1) The body of a froth fire extinguisher shall be provided with an opening for the introduction of an inner container.

(2) The opening:

(a) shall be fitted with a screw cap of gun-metal or other suitable material; and

(b) shall be screwed with a continuous thread through the side of which safety holes or slots are provided so that when the cap is being removed any pressure of gas remaining in the container will be released gradually should the discharge opening be choked.

(3) The cap joint shall be made with acid-resisting rubber, greased leather or other suitable material.

(4) If the extinguisher is provided with an inner container, the container shall be adequately supported.

7. (1) A reinforced discharge hose, together with a nozzle, shall be provided for a froth fire extinguisher.

(2) The area of the nozzle shall be such that, when the extinguisher is operated, the froth is projected:

(a) in the case of an extinguisher of 136 litres capacity or more — for a distance of not less than 13.5 metres for a period of not less than 100 seconds; or

(b) in any other case — for a distance of not less than 10.5 metres for a period of not less than 90 seconds.

8. The charge and the air space above the level of the liquid in the body of a froth fire extinguisher shall be so regulated that the maximum pressure in the extinguisher when put into action with all outlets closed does not exceed 2 megapascals with the liquid at a temperature of 38 Celsius.

9. A froth fire extinguisher shall be capable of withstanding for a period of 5 minutes an internal pressure equal to —

(a) a pressure greater by one-half than the maximum pressure in the extinguisher when put into action with all outlets closed; or