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ROYAL AIR FORCE. COMMON CORE AND DEPLOYMENT SKILLS AIDE-MEMOIRE

◉ Failure to correctly secure the knurled locking collar may result in uncontrolled extension of the applicator by gas pressure causing damage or possible injury to personnel nearby.

◉ Be prepared for jet reaction when using telescopic applicator, particularly when fully extended.

90 LITRE FLUOROCHEMICAL MECHANICAL FOAM (ALL WHITE)

The operation of the 90 litre Foam Extinguisher is as follows:

◉ Wheel the extinguisher as close as possible to the fire as radiated heat will allow.

◉ Remove the discharge hose and run it out to form a loop, returning to the extinguisher.

◉ Ensure the branch pipe on/off valve is closed.

◉ Open the Air Cylinder Valve fully in an anti-clockwise direction to pressurise the system, whilst maintaining a firm hold on the branchpipe.

◉ Briefly operate the branchpipe on/off valve to expel air in the system before approaching the fire zone to ensure media is available.

◉ Apply the foam to the fire at about waist height, moving the jet from side to side across the whole fire.

IDENTIFY AND OPERATE HYDRANTS

In order to assist fire crews at an incident all personnel are to be sufficiently familiar with the use of hydrants and associated equipment. The hydrants are designed as a means of tapping the water mains system for firefighting purposes. Hydrants are identified by means of a marker plate:

◉ The bottom number indicates the distance from the marker plate to the hydrant cover in metres. The top number is the size of the water main in millimetres.

◉ Hydrant covers are a yellow metal plate, the underside should be fitted with a plate indicating which direction to open the on/off valve.

◉ The hydrant pit houses the outlet valve and the on/off valve.

STANDPIPE, HYDRANT KEY AND BAR AND FALSE SPINDLE

In order to bring water from below the ground to the surface the following equipment is required:

◉ Standpipe. This is fitted to the outlet of the hydrant. It has a double outlet head, however, should only one outlet be required a blank cap may be fitted. Release lugs are fitted at the top of the outlets.

◉ Hydrant Key and Bar. The hydrant key and bar is for removal of the hydrant cover and operation of the on/off valve.

◉ False Spindle. In order to protect the soft metal of the hydrant on/off valve the spindle is fitted.

HOSES

Water is transferred from hydrants using a firefighting delivery hose as follows:

◉ Delivery hose comes in 2 sizes, 70mm x 25m lengths and 45mm x 25m lengths. Delivery hose from a hydrant to a fire appliance should be 70mm.

◉ Delivery hose is fitted with instantaneous couplings.

◉ Delivery hose may be conventionally rolled or Dutch rolled.

HYDRANT OPERATION

The hydrant is set up for operation in the following manner:

◉ Remove hydrant cover plate using the hydrant key and bar.

◉ Fit standpipe to outlet, fit blank cap as required to standpipe.

◉ Fit hydrant key and bar to false spindle.

◉ Operate on/off valve allowing water to flow briefly. This will ensure that debris does not enter the hose and confirms water flow.

◉ Connect delivery hose to standpipe.

◉ Run out delivery hose to directed destination, using either a conventionally or Dutch rolled hose.

◉ On receipt of visual or oral signal turn on hydrant.

EXAMPLES OF FIREFIGHTING APPLIANCES


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