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14 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Type of impeller in high pressure volute |
Regenerative peripheral impeller |
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Type of gauge for high and low pressure readings |
Bourdon Tube |
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Type of gauge used for compound gauge reading |
Diaphragm |
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How does a reciprocating primer work? |
Current Scania’s & Iveco’s have automatic double reciprocating primers |
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How is the pump working/water circulating when the HP/LP lever is in LOW? |
Water circulates through low pressure impeller to the high pressure impeller and continues around in this cycle |
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How is the pump working/water circulating when the HP/LP lever is in HIGH? |
Water travels through LP impeller into HP impeller, but NOT back around in a circuit. If LP deliveries in use only, excessive pressure can build up in HP volute, so a pressure relief valve is installed to let some water back around to LP volute at around 55 Bar |
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Why is the theoretical max lifting distance for open water 10m, but the practical 8m? |
Create flow - to give the water kinetic energy as it changes from its static state to its moving state Resistance - frictional loss in suction hose and couplings Entry loss - turbulence and shock as the water enters the impeller Strainer - pressure loss as the water is forced through the strainer and changes its direction of flow after entering Temperature - any water vaporising releases opposing vapour pressure |
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How does a water ring primer work? |
Circular impeller rotating in an oval volute creates area of low pressure, drawing air in |
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How does an exhaust gas ejector primer work? |
Venturi effect created as exhaust gases diverted and speed up to pass through the reduced diameter throat tube. This creates an area of reduced pressure ie a vacuum, drawing air through hard suction until a prime is achieved |
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Grindex pump facts & figures |
Model: Minex 50Hz Cable length: 20m Max output no hose: 500 lpm at 0m depth Max output 70mm hose: 300-400 lpm at 1 - 1.5 Bar Max output 45mm hose: 200-300 lpm at 1 - 1.5 Bar |
Model Cable length Max output no hose Max output 70mm hose Max output 45mm hose |
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British Standard and spec for hydrant manufacturing |
BS 750 2000 lpm at 1.7 Bar |
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Main Pump dry vacuum test Frequency and requirements |
Quarterly test If testing hard suction at same time, connect all lengths to pump with blank cap attached to end of last length Engage pump and prime to obtain vacuum of 0.8 Bar (compound gauge to read -0.8) Once achieved, gauge should not reach to -0.3 Bar within 1 minute |
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Ways of supplying water to the fireground using standard appliances |
Water shuttle - appliances deliver tank supply to fireground pump or a dam on fireground Closed circuit relay Open circuit relay (using dams - much less efficient but less effected by a pump failure) |
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Type of hydrant/water supply plate |
Back (Definition) |
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