Energy Conservation in Pumps

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Presentation on Pumps:

Presentation on Pumps By G.MURALIKRISHNA EE(E) BSNL ED-1

An Overview:

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:

Types of Pumps Dynamic Pumps Centrifugal Special effect pumps Displacement Pumps Rotary Reciprocating

Order of Preference:

Order of Preference Centrifugal Rotary Reciprocating

Pumps Used in Building Services:

Pumps Used in Building Services Sump Pumps Monobloc Bore well Pumps Submersible Pumps Jet Pumps

Centrifugal 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:

Pressure developed by the Pump depends upon Impeller dia No.of impellers size of the impeller eye shaft speed

Size of the pump:

Size of the pump Depends on Head Capacity

Advantages of centrifugal Pump:

Advantages of centrifugal Pump Very efficient Produce smooth and even flow Reliable with good service life


Disadvantages Loss of priming easily 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. Submersible Pumps

Jet Pumps:

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:

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 Pump Performance calculation

Slide 15:

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:

Key Parameter for determining efficiency Flow Head Power

Flow Measurement Techniques:

Flow Measurement Techniques Tracer Method Ultrasonic flow measurement Tank filling method Installation of online flow meter

Determination of total head:

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

Slide 20:

5 Discharge 8 L/s 8 L/s 6 Amps 8 8 7 Overall Efficiency 47% 47 % Typical name plate details of pump

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

Slide 22:

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 performance calculations

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. Typical observations/ Recommendations

Factors to be considered from user side:

Size pump correctly Operate close to the best efficiency point. Size all piping and valves correctly Avoid all leakages. Factors to be considered from user side

Flow control Strategies:

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:

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:

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:

Thank You

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