FL 03.1 – Series and Parallel Pumps

With this equipment, a large list of the operations can be put into practice, both start-up, operation and regulation necessary in a pumping installation.

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Description
One of the pumps is controlled by a frecuency inverter, which allows the speed of rotation to be varied. This pump has also a measurement system of mechanical torque.
The flow rate is measured by an electronic flow meter.
In addition, the study of the characteristics of a pump can be carried out, working individually and in a group, in series or in parallel, carrying out a wide range of experiments and experiences.
Learning Objectives
  • Start-up of a pump, analysis and study of different aspects to consider.
  • Priming pump.
  • Checking the sense of rotation.
  • Overcurrent produced in the engine.
  • Study and obtain the characteristic curves of a pump.
    • Height – flow (H-Q).
    • Hydraulic power – flow (P-Q).
    • Torque – flow (M-Q).
    • Mechanical efficiency – flow (hm-Q).
    • Mechanical power – flow (Pm – Q).
    • Efficiency of the engine – flow (he-Q).
    • Electric power – flow (Pe-Q).
    • Total efficiency – flow (h-Q).
  • Study of cavitation, and obtaining the N.P.S.H. Curve required-flow.
  • Study of the different forms of regulating a pump. Checking similarity laws.
  •  Variation of the rotational speed. Obtaining the new characteristic curves.
  • Changing the operating point by varying the pumping installation.
  • Manoeuvred of the discharge valve.
  • Analysis of the same and different pumps working in group.
    • Characteristic curves operating in serie.
      • Height – flow (H-Q).
      • Power – flow (P-Q).
      • Efficiency – flow (h-Q).
    • Characteristic curves operating in parallel.
      • Height – flow (H-Q).
      • Power – flow (P-Q).
      • Efficiency – flow (h-Q).
 
 
Technical Data
Internal diameters:
  • Suction pipe
    • Øinterior = 45,2 mm.
    • Øexterior = 50 mm.
  • Drive pipe
    • Øinterior = 34 mm.
    • Øexterior = 40 mm.
Tank:
  • Capacity: 250 litros
Manometers:
  • Bourdon type with glycerin from –10 to 70 m wc.
  • Bourdon type with glycerin from –10 to 35 m wc. (x3)
Pumps characteristics:
  • Maximum manometric height 24 m wc.
  • Flow: 20 / 120 l/min.
  • Manometric height: 23 / 12 m wc.
  • Consumed power 0,55 kW (0,75 HP).
  • Turning speed 2900 r.p.m. (50 Hz).
Other elements:
  • Electronic flowmeter 1200-50000 l/h
  • Dynamometer 2 Kg x 10 gr.
  • Wattmeters de 0 a 1200 W.
  • Frecuency variator.
Requirements
  • Power supply: 230V/50Hz.

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