pump power rating versus electricity consumption

[CJDahl]

I'm not familiar with the term "service factor". What does this represent and how is it calculated? thanks for any info!!

[mas985]

Service factor is determined by the motor manufacture and is usually stamped on the motor label along with the horse power. The "labeled" HP is virtually meaningless without taking into account the service factor. The true horse power of a pump (i.e. braking horse power) is the labeled HP times the service factor.