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11 Cards in this Set
- Front
- Back
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What are the 2 types of pump found on a front line appliance |
Centrifugal Positive displacement |
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Name the 2 parts of a single stage centrifugal pump |
Impellar (imparts KE) Volute (converts KE -> pressure energy) |
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How does the PTO drive the pump? |
The impeller is rigidly fixed to a drive shaft |
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In order to produce high pressure what kind of Centrifugal pump is required |
Universal Multi-pressure UMP A peripheral impeller is attached to the same drive shaft This impeller has guide vains on its outer edge Can lead to pressure 3/4 times greater than low pressure impeller Reduced water flow. |
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How can you tell how much water is in the appliance tank |
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The compound gauge can register positive and negative pressure, how |
Negative pressure will register when lifting from open water Postive pressure reading when appliance is being supplied from appliance tank |
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What could cause sudden pressure increase in low pressure gauge |
Branches being shut down Kinks in the hose Vehicles or debris on delivery hose |
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What could cause a sudden pressure decrease in low pressure gauge |
Branches being opened Burst delivery hose Apiance tank is empty |
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What does Tank to Pump button do |
Opens gate valve which allows water to flow from the appliance tank to Pump inlet |
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What does the hose reel pressure button do |
Switch controls crossover valve so water flows to peripheral impeller therefore supplying high pressure to hose reels |
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How to regulate amount of water being delivered |
Reducing number of jets Reducing branch flow setting Reduce appliance revs |
