Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
5 Cards in this Set
- Front
- Back
|
Water shuttle and water relay |
What are the two types of water relay?
Close circuit- water pumped through hose direct from pump to next using light portable pumps.
Open circuit - water pumped through hose to portable dams, reservoirs or appliance tank, entering inlet of next pump in the relay- used when employing pump appliance.
FIRST/ BASE PUMP- pressure fed or open water.
|
|
|
Capacity of hose |
To maximise the quantity of water delivered and minimise number of pumps needed. How do you improved the output of the pumps? 1. Shortening the distance between pumps by using more intemediate pumps Or Increasing the size (diameter) of the hose used. |
|
|
What is the distance between pumps? |
1. The flow required 2. Size (diameter) of hose lines between pumps. 3. Contours of the relay route.
When using 70mm hose from appliance pump - open circuit water relay- immediate pumps can be up to 8 lengths apart, 6 lengths on gradient (average 10 %)
Hose layer hose (90mm) distances can increase to 15 lengths and 12 lengths respectively. |
|
|
what are the Operating considerations? |
1.All pumps and other equipment being in good working order to ensure maximum output can be delivered. 2. Laying out relay in an organised manner that all equipment can work to its max capacity. 3. Skill of the operators. 4.good comms and incident management. |
|
|
Water flow within relay |
1.The demand from foreground pump will determine flow through relay.
2. Max flow is determined by output pressure fed supply.( hydrant)
3. Working from open water, suction considerations will govern input of the Base pump and maximum available flow.
-Ground monitors/aerial appliance can supply pressures required up to max of 15 bar at pump.
NOTE: No Lpp should be run without water more than 30 seconds as servere damage to the pump will occur. Water shuttle is when an appliances travel to water source, shuttle runs to the fire.continous low supply. Water relay - appliances are stationary and share water from each appliance. |
