What is a branch.
Something used to direct water jets
Name the four LFB branches?
RB101
Rausenbauer Projet II
Ultimatic Hosereel Branch
Highrise Delta Attack Branch
What flow rates and pressure does the RB101 work at?
130, 230, 300, 400 lpm
6 BAR but can work at 3 BAR
When would a branch be defected?
5 teeth missing, or 3 in a row
What pressure and flow rates does the Projet 2 work on?
3.5 BAR - Jet 440 lpm Spray 640 lpm
7 BAR - Jet 630 lpm Spray 930 lpm
Throws up to 57m
What is the diameter of the hosereel and the name of the couplings on it?
19mm and 23mm
McDonalds couplings
Describe the Akron Ground Monitor?
Name, nozzles, flow rates
Variable flow rate - 950, 1400, 1900 lpm
Single flow deluge - 1750 lpm
Foam - 950 lpm
How do you clean a dirty hose?
With water and a broom
If it is contaminated, send off to workshop
Name some hose fittings?
Three answers
90mm adaptor kit
Collecting breaching
Dividing breaching
What are the three lengths of 150mm hose and where are they stored?
5m, 10m, 50m
Stored on the High Volume Pump (HVP)
List four ways to care for hose?
Four answers
Should be ramped when laid across the road
Under run and clean when stowed
Should not be kinked when pressurised
Not to be made up when frozen
What strap do all hoses have?
Bandit strap - identification
Defected hoses are rolled on what coupling, and what knot is used to show they are defected?
Male coupling
Overhand knot
List the four diameters of lay down hose?
Four answers
45mm, 70mm, 90mm, 150mm
Describe the hosereel?
Lengths, drums, water delivery
Two drums on each appliance
Four lengths of 18.3m on each drum
Designed to deliver low volumes of water at high pressure
19mm diameter
How often are hoses tested?
Three answers
On acceptance
After operational use
Annually
Describe the hard suction hose?
Length, diameter, quantity
2.44m long
100mm diameter
Two lengths on each appliance
What is the hard suction hose used for?
To withstand external atmospheric pressure
Used to lift water from an open water source
What is the object that creates a water seal in the female coupling?
A washer
What hoses use Storz couplings?
90mm and 150mm
How are Storz couplings connected?
Using Storz spanners, making sure the red dots line up
What do hose couplings do?
Join two lengths of hose together
Which hoses have instantaneous couplings?
45mm and 70mm
Describe the 45mm and 70mm hose?
Lengths, weight, how many, max working pressure
45mm - red, 23m long, 9kg, 4 lengths on each appliance, pump and pump ladder, 15 BAR pressure
70mm - red, 23m long, 15kg, 10 lengths on each appliance, pump and pump ladder, 15 BAR pressure
Describe the 90mm hose?
Lengths, weight, how many, max working pressure
90mm - yellow, 30m long, 23.5kg, up to 4km of hose on hose laying units, 15 BAR pressure
Explain the numbers on hydrant plates?
Arms - diameter of mains pipe in inches or mm
Legs - distance to the hydrant in feet or m
Where would you find a pressure release instantaneous coupling?
Two answers
On a double headed standpipe, and pump outlets
When do hydrant tests take place?
Two answers
Visually each year, standard tests every four years
April - September, or October
What is a drain boss?
Allows water to drain from the hydrant pit when it has been turned off
Why are false spindles used?
Two answers
Protects the hydrant spindle from damage
Easily replaceable
What are the hydrants British Standards?
Three answers
65mm round thread outlet
2000 lpm at 1.7 BAR
Opens anti-clockwise
What is the purpose of a hydrant?
To provide water in the case of an incident
What is hydrant gear? What is the purpose of the standpipe?
Standpipe, key and bar
To access the hydrant from above ground level
What is m given to opening, flushing and connecting the hydrant?
Shipping or setting the hydrant
Who is responsible for making sure London has adequate water for fire fighting?
LFEPA
Name two types of detection devices for hydrant leaks?
Magnetic and Screw-on
What should be done with screw-on leak detection devices after an incident?
Should be removed and left at the bottom of the hydrant pit, then inform the water company
Name examples of open water sources?
Rivers, canals, docks, swimming pools, Wells
Why does the LFB lift from open water?
Supplying large amounts of water
In cases such as flooding
Practically water can only be lifted from 8m not 10m. What factors cause this? OFPITA
Overcoming inertia (getting it moving) Frictional loss Pump entry loss Imperfect vacuum Temperature Atmospheric pressure
What is the name of the pump the LFB use?
Godiva World Series Universal Multi-Pressure Centrifugal Pump
What are the two parts of the pump?
Two answers
Impeller - Rotating component creates kinetic energy
Volute - Casing, turns kinetic to pressure energy
What are the flow rates and pressures of the hosereels?
30-40 BAR
115-150lpm
The centrifugal Pump can do what three things? How it operates
Three answers
High volumes at low pressure
Low volumes at high pressure
Both simultaneously
What is the capacity of the appliance tank?
Water and foam
1400 litres of water
127 litres of foam
How much water can the pump deliver?
2700lpm
An increase in the low pressure gauge could mean?
Three answers
Branches being shut down
Kinks in delivery hose
Vehicles or debris on the delivery hose
A decrease on the low pressure gauge could mean?
Three answers
Branches being opened
Burst delivery hose
Appliance tank is empty
If the bipass valve is to be used, what must be done, and what would be the water usage?
Inform the IC, as Pump is defective
1000lpm
Give four factors affecting pressure loss?
Four answers
Diameter and length of hose
Output flow of water
Height above or below the water source
What is the frictional loss of a hosereel working at 115lpm?
8.5 BAR
What are the frictional losses for 45mm and 70mm hose?
45mm - 1 BAR
70mm - 0.2 BAR
For every meter above the water source, how much pressure is lost?
0.1 BAR
Every 3 floors is about 1 BAR
How much BAR is atmospheric pressure at sea level?
1 BAR
What equipment is used when lifting from open water?
Seven answers
Hard suction hose Suction strainer Strainer basket Suction wrenches 140-100mm adapter Short line Salvage sheet
What knots are used when attaching a short line to a hard suction hose, to keep it bent and in an S-shape?
Clover hitch by the strainer
Half hitches to bend it
Round turn two hitches by Pump
How deep must the strainer be below the surface to stop a vortex happening?
300mm or more
For every meter of lift, what will the compound gauge reading show?
-0.1 - If lifting from 3 meters, the gauge would show -0.3
If the compound gauge reading increases, what could this suggest?
Four answers
A tidal water source dropping
Suction strainer blocked
Branches open
Burst delivery hose
A decrease in the compound gauge could suggest what?
Three answers
Rising tidal source
Branches shut down
Slight air leak in the suction hose
What is the Angus Turbex Mark II?
A giant fan that blows foam in a certain direction
What types of foam do the LFB use?
Two answers
Low and high expansion foam
Where is medium expansion foam commonly used?
At airports
What are the differences between low and high expansion foam?
Low expansion is sticky, but doesn’t expand much
High expansion is not sticky, but expands lots
Medium expansion is somewhere in the middle
When would high expansion foam be used?
For filling enclosed rooms where there is a fire, such as a basement
