Dual Speed Pump Question

[duraleigh]

SLS,

I'm gonna' address two issues you brought up.

150v vs. 220v??? Oops!!

Now, the real reason for my post.....

If I stay with 1 1/2" pipes throughout the max flow is 42 to 44 gpm so I don't really have to worry about too much flow to the filter right?

I have seen this several times on the old forum (R.I.P.) as well and I can't understand the reasoning. If the pressure is high enough, you could get water through the pipe until the sidewalls melted from the friction!! Exponentially greater than 44gpm, IMHO.

Of course pool pumps can't produce that much but I'm illustrating a point (I think!! Am I missing something?)

So, I don't mean to hijack your post but I don't think you can count on 1.5" pipe being the limiting factor in gpm.

[Waterworks]

The reason for the 45 GPM rating for 1.5" pipe is the velocity of the water. It is preferred to have your water moving at 8' per second or less. In 1.5" pipe 45 GPM of water moves just under 8' per second. At faster speeds the friction loss per foot of pipe increases at a faster rate, so pumps operate more efficiently under 8' per second. And also, the friction loss is so great that normally the head will increase by enough that the flow will be reduced to approximately 45 gpm.

The Whisperflo is a better pump the Hayward Super pump. It also pumps more water when comparing HP to HP. The 3/4 HP Whisperflo pumps 70 GPM @ 50' of head. The 1 HP Super pump pushes 50 GPM @ 50' of head. The Whisperflo is quieter on high speed and I've always found it to be a more heavy-duty pump. The Whisperflo is meant to compete with the Hayward Northstar and the Pentair Super Flo is meant to compete with a Super Pump.

Brad

[duraleigh]

Hi, Brad,

That makes sense. It seems to be a point where the pump people have decided it's not really worth it to push more water thru because the friction loss increases exponentially.

To me, it still means you could (If you were really dumb) put a 3hp pump on a 1.5 inch line and get far more than 45gpm......however, your electric bill would be larger than your house payment.

[CarlD]

The Whisperflo is a better pump the Hayward Super pump. It also pumps more water when comparing HP to HP. The 3/4 HP Whisperflo pumps 70 GPM @ 50' of head. The 1 HP Super pump pushes 50 GPM @ 50' of head. The Whisperflo is quieter on high speed and I've always found it to be a more heavy-duty pump. The Whisperflo is meant to compete with the Hayward Northstar and the Pentair Super Flo is meant to compete with a Super Pump.

Brad

So you may WELL have made a good deal--in which case, be happy!

[SLS]

I am feeling much better about my purchase now!!! Hopefully I won't have trouble wiring it up!!!! I can't wait to get the pool up and running again. I just hate seeing the big black tarp!!!!!