Flashcards in Water Shuttle/Water Relay Deck (7)
Where would water shuttle happen
In More rural areas where distances between water sources and the fireground may be considerable or over difficult terrain.
Two types of water relay
Closed Circuit - In which the water is pumped through hose direct from one pump to the next. This is the type of relay used with LPPs.
Open Circuit - In which water is pumped through hose to portable dams, reservoirs or the appliance tank before entering the inlet of the next pump in the relay. This type of relay is used when employing pumping appliances.
If the relay is producing insufficient flow, the output can only be improved by significantly by
Shortening the distance between pumps by using more intermediate pumps.
Increasing the size (diameter) of the hose used.
The distance between pumps in any relay depends on
The flow required.
Size (diamete) of hose lines between pumps.
Contours of the relay route.
The efficiency of a water relay depends on the following important factors
All pumps and other equipment being in good working order to ensure maximum output can be delivered.
Layout of the relay being organised in such a way that all equipment can work to it's maximum capacity.
Skills of the operator.
Good communications and incident management.
Water flow within the relay
The demand from the fireground pump will determine the flow through the relay.
The maximum flow is determined by the output of the pressure fed supply (hydrant)
When working from open water, suction conditions will govern the input of the base pump and the maximum available flow.