5 replies to this topic

[abbaschemical]

Dear Professionals,

                                I am pumping a fluid of 320 m3/hr in a pump that is rated to operate at 400 m3/hr  i.e by discharge valve in throttled condition . Now if i decided for energy optimaisation whether i should go for impeller trimming or VFD(Variable Frequency Drive) ? When to opt for impeller trimming and when to go for VFD ?

Edited by abbaschemical, 02 July 2013 - 03:12 PM.

[abbaschemical]

Is there anything to do with mechanical concerns ?

[abbaschemical]

Any ideas ?

[harshad katre]

You can decide this with the help of head vs flow curve given by pump manufacturer. For this you also require head that is being generated by pump and required head for your equipments.

[Steve Hall]

If your pump will always operate without a control valve, then impeller trimming will use less energy than a VFD because the VFD drive itself has an efficiency of less than 1. However, if you still require a control valve even with the trimmed impeller then a VFD will require less energy since you won't have to absorb energy in a control valve.

[abbaschemical]

Dear Steve,

                   Thanks for the reply. This reason seems satisfying. I have also sorted out the cases and came to understand with the same conclusion. Thanks once again.