# How to operate pumping system efficiently?

Last updated on February 27th, 2021 at 02:20 pm

Pumping system operating efficient operation is important to reduce operating power cost. Considering a typical 5 year lifecycle of 100KW and above pumps, spent on power contributes to more than 90% of total ownership cost. Therefore it is important to consider operating efficiency of pump. Pump efficiency is always a major consideration while pump procurement, but because of no of reasons in many cases pump efficiency drops while operation. lets check, How to operate pumping system efficiently.

##### Reason for efficiency drop can broadly be divided in two categories:-
1. Best efficiency point shift as per system requirement.
2. Pump efficiency deterioration.
##### Let us try to estimate pump operating efficiency step by step:

STEP-1 Measure and collect pump system data as below

1. Operating Flow
3. Fluid type
4. Motor power withdrawn and shaft power.
5. Pump curve

STEP-2 , After collecting data measure pump efficiency

Efficiency of pump is calculated by

Pump efficiency                = Ph(kw) / Ps(KW) X 100

Where, Ph(kwis hydraulic power &  Ps(KW) is shaft power

Hydraulic power

Ph (KW) = ( (Sprg X Q ) X H X g) / 3600

• Q = capacity in m3 / hr
• spgr = specific gravity (water =1)
• H = differential head in mtr
• g = gravitational acceleration in m / sec 2 (g=9.8)

Ps (KW) = motor measured power X motor efficiency

STEP 3 Example with a typical pump data

Data collected as per below format and pump efficiency calculation

Pump flow 750 m3/hr,

Measured power = 109 KW

Motor efficiency = 93%.

Ph (KW) = 750X37X9.8/3600 = 75.54 KW

Ps (KW) = 109X.93 = 101.37 KW

Pump efficiency =75.54 / 101.37 =74.5%

STEP 4 Identification of Problem

STEP 5. Solution to pump efficiency drop

Pumping system operating efficient operation can be achieved by identification and elimination of reason for efficiency drop. Operate pumping system efficiently to reduce power consumption and save on operating cost.