SQ and SQE application differences [RE-wrenches]

[Matt Tritt]

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Windy,

The possibility that the guy I talked to is actually missing some info 
is always possible; after all, the infernal auto-director phone system 
described him as "applications engineer". (At least he isn't selling 
something) He did manage to convey the feeling that if anything, the SQE 
uses "at least" less power to accomplish the same work as the SQ (his 
actual language). Yes, I know that we are moving the same amount of 
liquid against the same amount of resistance with the same impellers, so 
why should it be different from pump to pump, no?

Since I do have to call them again on a different matter (SQFlex's 
actually can fail!), I'll get a second opinion. ;-)

Matt

Windy Dankoff wrote:

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> Matt,
>
> SQE is a centrifugal (multistage) pump, not positive displacement 
> (like a helical rotor). For that reason, I don't believe it uses 
> PROPORTIONALLY less power at lower flow. Less power yes, but to say 
> proportionally less would be very optimistic by my understanding. This 
> would be especially true if the pump is being used at a pressure that 
> is relatively high in its range. You may have been talking to more of 
> a sales person than an engineer.
>
> Maybe you can call them back and discuss this further. I don't mind 
> being wrong. I'd rather know if I am.
>
> And Brian -- Perhaps I'll buy the wine after all (considering the 
> poverty level of your customers ... )
>
> Windy
>
>
>> ...  Another thing that occurs to me is that perhaps the SQE uses
>> proportionally less energy to run at low flow compared to high
>> flow/pressure? Just perhaps (if this is the case) the net energy usage
>> might be similar to a conventional pump arrangement.
>> Windy; you there? What do you think?
>
>
>> ...OK, I just called Grundfos about my thoughts on the possibility 
>> that the
>> SQ and SQE might actually use about the SAME amount of energy to pump
>> the same amount of water. I was wrong! The SQE actually uses_ less _!!
>> The only difference is that the SQ (or any conventional pump) will
>> consume a lot of power for short bursts, whereas the SQE power draw is
>> proportional to the actual flow.
>>
>> Matt
>
> -- 
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