INEFFICIENT PUMP SYSTEM

WHICH PUMPING SYSTEM SHOULD BE EXAMINED? 
SIGNS OF INEFFICIENT PUMPING SYSTEMS
  • Most powerful pumps. It is Recommended to select pumps with shaft power more than 30 kW.

  • PS which have maximum operating hours.

  • Pumping systems with the throttle or bypass control must be considered at first.

  • PS with the large flow or pressure variations. 

  • PS with extra vibration and noise (pumps, valves, pipes …).
     

  • PS with multi-pump stations in which neither number of pumps nor their speed don't change in response to changing conditions.

  • Focus on centrifugal pumps operating at a fixed speed.

  • Pumps with low reliability, lowest MTBF (mean time between failures) and with great expenditures on service. 

  • PS with a long term of operation (changed conditions, worn-out pumps, corroded pipes, etc).

  • PS with cavitating pumps.

  • PS with jammed valves or leaking valves.

DO YOU APPLY A THROTTLE CONTROL?
Is throttling significant?
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FLOW AND PRESSURE FLUCTUATE IN A LARGE RANGE?
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Daily flow fluctuation 
HIGH VIBRATION AND NOISE OF PUMP, MOTOR, PIPES, VALVES.
  • The pump operates beyond the allowable operating range. 

  • The throttle control is applied.

  • Cavitation in pumps and in valves. 

  • Mechanical problems with pumps, motors, valves. 

  • Improper installation of pumps, motors, pipes. 

PS WITH MULTI PUMP STATIONS IN WHICH NEITHER NUMBER OF PUMPS NOR THEIR SPEED DON'T CHANGE IN RESPONSE TO CHANGING CONDITIONS 
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  • The control system is not properly adjusted or PS has mainly with friction losses.

PUMPING SYSTEMS WITH HIGH MAINTENANCE COST.   
NOT RELIABLE systems are NOT EFFICIENT systems   
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When the pump operates beyond the operating range it leads to ineffective and not reliable operation

Pump reliability curve
PUMPING SYSTEMS FOR WHICH FUNCTIONAL REQUIREMENTS HAVE CHANGED OVER TIME.
The technological process has changed
The population has changed and water consumption
 The water supply systems very often are designed with taking into account potential growth. 
 
BUT PUMPS HAVE NOT BEEN CHANGED
CLOGGED PIPELINES, HEAT EXCHANGERS, FILTERS OR PUMPS
Increased resistance and losses in the elements of the system
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Worn, eroded, corroded, distorted or broken Impellers/diffusers/vanes or wear rings and casings of pumps
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JAMMED  VALVES OR LEAKING VALVES.
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Jammed valves usually stuck in some position and create hydraulic losses.

If some of these signs are present 
PS operates inefficiently

Pump users should start deeper research of their Pumping System.