When lifting from open water, what would a compuond reading of -0.2 indicate?
A lift of 2 metres
What are the sizes of soft suction hose available
45mm
70mm
90mm
150mm
What would cause a decrease in low pressure when working on the pump
- branches being opened
- burst delivery hose
- the appliance tank is empty
When would you use a 90mm adaptor
When connecting a storz coupling to an instantaneous coupling
What are the safety precautions when using a ladder
- Risk assess potential access points before pitching the ladder.
- Make sure the ladder is long enough for the task.
- Make sure the ladder is placed on stable ground and pitched at a safe angle.
- Be aware of overhead obstructions and electricity cables.
- Make sure the head of the ladder is resting on a stable point and tie the head off when additional security is required.
- Take care to avoid knocking the ladder when moving equipment or hose.
What is the length of the hard suction hose
2.44 m
What is the single most important factor affecting pressure loss
Diameter of hose
When lifting from open water, what would cause an increase in pressure on the compound gauge
- Level of supply dropped (tidal or water source used up).
- Suction strainer blocked.
- Branches opened.
- Burst delivery hose.
How many lengths of hosereel hose are carried on the appliance
8
What are the factors that affect pressure loss
Internal diameter of hose
(The smaller the internal diameter of the hose the greater the amount of frictional loss.)
Output flow of water
(The higher the required output, the higher the amount of frictional loss.)
Height in metres above or below the water source (Working above the water source will result in a pressure loss. Working below the water source will result in a pressure gain.)
Length of hoseline
What are the two types of pump
Centrifugal (pumps fluid) and positive displacement (pumps air)
What are the safety precautions when working on a ladder
- Three points of contact should always be maintained
- Do not overreach, make sure the centre of the body always stays within the strings of the ladder.
- Do not work on the top three rounds.
- Do not overload the ladder. Unless assisting a casualty down the ladder, a maximum of one person per extension is allowed.
What would cause a decrease in the vacuum reading on the compound gauge
- Level of supply raised (tidal).
- Branches shut down.
- Slight air leak on suction side of pump.
What are the reasons why we cannot create a perfect vacuum
Overcoming inertia Frictional pressure Pump entry loss Imperfect vacuum Temperature Atmospheric pressure
Define a primer
A device which can pump air
