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Presentation on Pumps (PowerPoint)

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					Presentation on Pumps


By
G.MURALIKRISHNA
EE(E) BSNL ED-1
An Overview
 Types of Pumps
 Features of various Pumps
 Selection of pumps
 Performance Calculation
 Flow control strategies
 Energy saving measures in Pumps
Types of Pumps
 Dynamic Pumps
  • Centrifugal
  • Special effect pumps
 Displacement Pumps
  • Rotary
  • Reciprocating
Order of Preference
 Centrifugal
 Rotary
 Reciprocating
Pumps Used in Building Services
 Sump Pumps
  • Monobloc
 Bore well Pumps
  • Submersible Pumps
  • Jet Pumps
Centrifugal Pumps
 Very simple design
 Two main parts are the impeller and the
  diffuser
 Impellers
  • Bronze
  • poly carbonate
  • cast iron
 stainless steel
Pressure developed by the Pump
 depends upon
  •   Impeller dia
  •   No.of impellers
  •   size of the impeller eye
  •   shaft speed
Size of the pump
 Depends on
  • Head
  • Capacity
Advantages of centrifugal Pump
 Very efficient
 Produce smooth and even flow
 Reliable with good service life
Disadvantages
 Loss of primingeasily
 Efficiency depends upon operating design
  head & speed.
Submersible Pumps
 Centrifugal pump closely coupled with
  motor
 Does not require long drive shaft
 Motor operates at a cooler temperature.
 Noiseless operation.
 High efficiency
 Smooth and even flow
 In case of repair full pump to be removed.
Jet Pumps
 Combination of a surface centrifugal pump,
  nozzle and venturi arrangement.
 Used in small dia bore wells.
 Simple design
 Low purchase and maintenance cost.
 Easy accessibility to all moving parts.
 Low efficiency.
DSM measures to reduce
consumption in pumps
Demand side management measures
 Use of friction less foot valve.
 Use of HDPE pipes
 Use of appropriate capacitor.
 Use of higher size suction pipe compared to
  delivery pipe.
Pump Performance calculation
 Overall Efficiency  = Hydraulic power ( P2) X
  100/ Power input ( P1)
 Pump efficiency. = Hydraulic power ( P2) X
  100/ Power input to pump shaft ( P3)
 Hydraulic Power ( P2) = Q X Total Head ( hd -
  hs ) X p X g / 1000
 Q = discharge in m³/s
 p = density of fluid  in kg/ m³
 g = acceleration due to gravity ( m/s²)
 P1 = 1.732 X V X I X pf
 P3 = P1 X eff.of motor.
Key Parameter for determining
efficiency
 Flow
 Head
 Power
Flow Measurement Techniques
 Tracer Method
 Ultrasonic flow measurement
 Tank filling method
 Installation of online flow meter
 Determination of total head
 Suction head
  • measured from pump inlet pressure gauge
    reading
 Discharge head
  • This is taken from the pump discharge side Pr.
    gauge
Typical name plate details of
pump
 Pumps: (Monoblock Pumps used for
 Drinking water)
  •   Sl.No ITEM         Pump1    Pump2
  •   1    Make          Beacon   Beacon
  •   2 Capa hp/kW       5 (3.7) 5 (3.7)
  •   3 Pipe sizes S/D   65/50 mm 65/50 mm
  •   4    Head          25 m      25 m
Typical name plate details of
pump
  • 5      Discharge      8 L/s    8 L/s
  • 6      Amps           8         8
  • 7Overall Efficiency      47%    47 %
Typical performance
calculations
 PUMP EFFICIENCY      CALCULATION
  SHEET
 SL.NO. ITEM Pump1 Pump2 Units
 1 Voltage    406   407   volts
 2 Current     6.0  6.6    amps

3  P.F         0.83     0.82
 4 Power input 3.5      3.48   KW
Typical performance
calculations
5   Dis. Head 22.2      22.2  m
6   Suc.Head      2.2     2.2  m
7   discharge 8          8    L/s
8   Hyd.Power 1.57       1.57 KW
9   Pump Effi. 44.85    45.10
Typical observations/
Recommendations

  1. Replace the existing discharge line with
  the 50 mm dia pipes to reduce the friction
  losses.
 2. Provide water level switch to switch off
  the pump sets as soon as the Tank is filled.
 3. Replace the existing pump sets with
  high efficiency pump sets.
Factors to be considered from
user side
 Size pump correctly
 Operate close to the best efficiency   point.
 Size all pipingand valves correctly
 Avoid all leakages.
Flow control Strategies
 Varying speed
 Pumps in parallel
 stop/start control
 Flow control valve
 By pass control valve
 Trimming impeller
 Use of VFDS
Energy conservation
opportunities in pumping
 Operate pump near best efficiency point.
 Replace old pumps by energy efficient
  pumps
 Reduce system resistance by pressure
  drop assessment and pipe size
  optimization.
 Provide booster pump for few areas of
  higher head.
Energy conservation
opportunities in pumping

  Conduct water balance to minimize water
   consumption.
  Ensure availability of instruments like
   pressure gauges, flow meters.
  Repair seals and packing to minimize water
   loss.
  Avoid valves in discharge side as far as
   possible.
  Operate pumpset during non-peak hours.
Thank You

				
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