Fire exam Flashcards
13.5m Ladder
Housed Extended full Extended working Width Width with stabiliser Weight Extension line
Housed - 5.8m Extended full - 14.1m Extended working - 13.5m Width - 0.8m Width with stabiliser - 1.4m Weight - 95kg Extension line - 16mm
9m Ladder
Housed Extended Width Weight Extending line
Dimensions Housed - 5.5m Extended - 9.1m Width - 540mm Weight - 46kg Extending line - 14mm
Roof Ladder
Housed
Extended
Width
Weight
Housed - 3.2m
Extended - 6.1m
Width - 340mm
Weight - 18.5kg
Triple extension ladder (Short extension ladder)
Housed
Extended
Weight
Housed - 2.7m
Extended - 6.4m
Weight - 21kg
Hydrant Gear
Standpipe
Key
Bar
All hydrants are installed to BRITISH STANDARD 750 (1984)
Requirements
65mm diameter flanged, round thread outlet made from gunmetal
An outlet cap should be attached to the hydrant by means of a chain
The spindle should be provided with a cast iron cap (commonly called a false spindle)
must close clockwise and the direction of opening is permanently marked on the hydrant
The cast iron parts of hydrants are treated with an approved rust proofing process.
The hydrant shall be capable of delivering no less than 2000 lpm at a constant pressure of 1.7 bar.
Hydrant covers should be clearly marked by having the words Fire Hydrant or the initials FH
Definition of a pump
“A pump is a machine driven by some external power for transmitting energy to fluids. This energy may be provided by the operator’s own efforts, such as hand pumps, or by coupling the pump to a suitable engine or motor.
REQUIREMENTS OF A PUMP
Self-contained Light in weight Able to handle large quantities of water Able to produce fairly high pressures Reliable Easy to operate and maintain.
Advantages of peripheral pump
High pressure at low running speeds
Mounted on same shaft as centrifugal pump
Ideally suited for use with hose reel
Working with an open water supply and an increased vacuum reading (moving towards 1) could be attributed to:
A drop in the level of the supply (i.e. a tidal source).
A block suction strainer (discharge pressure reading at flowmeter could be effected).
With open water a decreased vacuum reading (Moving towards 0) is noted which could be attributed to:
A rise in the level of the supply (tidal source).
Slight air leak on the suction side of the pump.
Where a loss of vacuum occurs this can be attributed to;
Suction strainer rising above the surface of the supply.
Suction strainer coming close to the surface of the supply and forming a “Vortex” causing entrainment of air.
Where there is a high vacuum reading with a failure to prime
Blocked metal or basket strainer
Collapsed internal lining of suction hose
Types of water relay
Closed circuit ( including porter relay)
Open Circuit
Use of hose layer equipment
Closed circuit Advantages
Economy of equipment
Speed of getting to work
Continues flow of water provided from base pump to discharge pump
Continues flow through all breakdowns except burst length
