Submersible Pump and submergible Pump

[ozmosis]

Hi all
am I correct to say that a submergible pump will have the pump submerged and the motor (if motor is used) above/outside the liquid, compared to a submersible pump that immerses the pump and motor as one?

We have a large tender specification that requires us to specify VFD's to a series of applications. One of the comments is that this is a submergible pump and we are going to offer a VFD without sinewave filter. A submersible pump in our opinion would always require a sinewave filter on the output due to the fact that the motor insulation of a submersible pump would typically be very poor as it would rely on the cooling effect of the water it is pumping.

I just want to ensure that the explanation of the two types of pumps is quite different when looking at the motor.

Thanks

 

[micalbrch]

Isn't that the same? Submersible Pump - Submergible Pump? I guess it is just the wrong adjective to "to submerge". Is it a US tender? If yes, I'll be wrong. If not, I might be right.

 

[ozmosis]

It's in Australia.
I have checked through various sites and wiki and can certainly see that there is a difference myself but I'm "(Electrical)", so just checking.
Submergible seems to have the actual pump itself submerged and the motor above ground with a mechanical connection between the motor shaft and the pump shaft.
If the motor is above ground then it is far more lifely to be a 'standard' motor that is ok running from a VFD, without the necessity of a sinewave filter.

We supply our VFD's that control submersible pumps and they are certainly special and require special considerations when it comes to output filters etc.

 

[Artisi]

I would agree with the definition, same - same, and why would motor insulation be poor?

 

[itsmoked]

You don't need a filter just because it's sub-anything. A filter would recommended if the lines to the motor are long.

As for the semantics, I'd not depend on a logical discussion in here, I'd ask specifically what style pump motor system they're referring to.

Keith Cress
kcress -

http://www.flaminsystems.com