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Service Delivery 3 Pumps. Aims To provide students information about fire service pumps and their operation.

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Presentation on theme: "Service Delivery 3 Pumps. Aims To provide students information about fire service pumps and their operation."— Presentation transcript:

1 Service Delivery 3 Pumps

2 Aims To provide students information about fire service pumps and their operation

3 Learning Outcomes At the end of the session students will be able to: Detail the requirements of a fire service pump Describe how a centrifugal pump works Describe how a peripheral pump works Detail the operating principles of an ejector pump continued…

4 Detail the operating principles of priming devices used within the brigade Describe the operating principles of pressure and compound gauges List the considerations to be taken into account when carrying water List the considerations to be taken into account when relaying water.

5 Types of pumps NON-POSITIVE - Displace only liquids a separate primer being required to remove the air from the system. POSITIVE - Displace both liquids and gases

6 Requirements of a pump Self-contained Light in weight Able to handle large quantities of water Able to produce fairly high pressures Reliable Easy to operate and maintain. A fire service pump must be;

7 Non-positive displacement pumps Centrifugal pumps Peripheral pumps.

8 Centrifugal pumps Consist of; Spinning part called the impeller Casing called the volute.

9 Water inlet. volute impeller

10 Purpose of the volute To channel water from the periphery to the outlet Reduce water velocity and turbulence Increase the water pressure.

11 water inlet Guide vanes. impeller volute

12 Characteristics of centrifugal pumps At any given speed where there is no flow pressure is at a maximum Pressure decreases as the delivery valves are opened and the flow increases When pump speed increases pressure and flow increase When suction lift increases pressure and flow decrease.

13 Advantages of centrifugal pumps Simple maintenance Can be run against closed deliveries without damage Light and compact relative to their output Can be driven directly from an internal combustion engine.

14 Velocity and pressure changes within a centrifugal pump. velocity pressure Suction hose impeller volute

15 Increasing pump pressures This can be done in a number of ways; Increasing the size of the impeller Increasing the speed of the impeller Increasing the number of impellers (as in a 2-stage or multi-stage pump) Using a peripheral pump.

16 Peripheral pump.

17 Operating principles.

18 The peripheral pump Advantages; Can produce high pressures at relatively low running speeds,saving on wear & tear Can be mounted on the same shaft as the centrifugal pump Ideally suited for use with high pressure hose reels.

19 The Godiva UMPX pump.

20 Power take off (PTO) Directs engine power away from the road wheels to drive another piece of equipment, such as the fire pump.

21 Cooling systems During pumping operations some water is taken from the high pressure side of the pump to a heat exchanger where it assists in cooling the engine The water then flows back to the low pressure side of the pump.

22 Priming There are three ways to prime a centrifugal pump; Use of a gravity fed supply Via a pressure fed supply By using a priming device to remove air from the pump.

23 Function of a primer Used where a static water supply is lower than the pump The primer removes air from the pump and creates a partial vacuum allowing atmospheric pressure to effectively force water up the hard suction into the pump.

24 Water ring primer. Rotating impeller Outlets Inlet from pump

25 Water ring primer. Ring of water Oval housing Low pressure

26 Water ring primer. Air is forced out of the primer Air rushes in from pump

27 Operating principle of the ejector pump. JetThroat Fluid & propellant Venturi effect Surrounding fluid

28 Hughes-Noble ejector pump. propellant throat area

29 Lightweight pump.

30 Exhaust gas ejector.

31

32 Gauges Pressure gauge Compound gauge Tachometer Water tank contents Oil pressure gauge Fuel tank contents Engine coolant temperature.

33 Typical gauge group.

34 Pressure gauges Low pressure gauge High pressure gauge. Showing the output pressure of the pump;

35 Bourdon tube gauges.

36 Compound gauges Show the inlet pressure of the pump The reading may be positive if supplied from a hydrant or negative when lifting from open water.

37 Compound gauges.

38 Compound gauge.

39 Brass housings. Rear HousingFront Housing

40 Rear HousingFront Housing.

41 Vacuum.

42 Positive Pressure.

43 Compound gauge.

44 Negative readings A negative reading of 0.1bar would indicate a lift from open water of approximately 1metres A reading of 0.4bar would indicate a lift of 3 metres allowing for practical considerations.

45 Water carrying Used where the water requirement is relatively limited When the distances between the water source and fireground may be considerable.

46 Water relaying.

47 Distances between pumps Depends on; The flow required Pump pressure used Contours of the relay route Size, type and number of hose lines If the pump is lifting water as well as delivering.

48 Confirmation Assessments will be based on this lesson and the corresponding study note Learning Outcomes Detail the requirements of a fire service pump Describe how a centrifugal pump works Describe how a peripheral pump works Detail the operating principles of an ejector pump continued…

49 Detail the operating principles of priming devices used within the brigade Describe the operating principles of pressure and compound gauges List the considerations to be taken into account when carrying water List the considerations to be taken into account when relaying water.

50 THE END


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