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The detrimental effect on parts life and efficiency of pump at
1. High speed
2. Short stroke
3. High discharge pressure
4. Low suction pressure
Fast speeds and short stroke result in high stroke reversal rate is a
major cause of wear in reciprocating pumps handling abrasive liquids. If
pump speed is reduced to half of rated speed, parts life improvement
more than doubles longer stroke length contributions to greater parts
life are effective because they decrease stroke reversal rate. At reduced
speed for equal output results in significant cost savings from increases
in the expected life of expendable pump parts. The piston speed below
200 fpm generally provides proportionally more trouble free hydraulic
performance for all pump type and size.
The mechanical efficiency of single action triplex pump is 90% and
double acting duplex pump 85%. In order to experience maximum
savings, both pumps should be operated at equal rpm.
Advantage of low speed:1. Extended parts life
2. Reduced mechanical maintenance
3. Lower parts replacement costs.
Better to operate both mud pumps in equal rpm to enhance service life
of expandable and the life of the pump itself.