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yeah. but dolphins have been around since the 80s....I'm not scared. . At one point all pumps, including Dolphin were new.
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yeah. but dolphins have been around since the 80s....I'm not scared. . At one point all pumps, including Dolphin were new.
+1 great pumps. used them on my old 220I know you specified DC Pump, but it it hard to beat the tried and true Mag Pumps!
http://www.freecalc.com/fricfram.htmI calculated 15.6 feet of head pressure. 10 vertical feet and 14 horizontal feet.
DC doesn't save power? Sure does. Here is my comparison. I ran an Iwaki MD-70, 1536 GPH, 336 watts. I'm now running 2 Vectra M1's, 2000 GPH each, 80 watts each. Seems I get more GPH for a LOT less watts. I am saving power over the AC Iwaki I was running.
to test this idea:
i found an amp master 3900.
I say there's no such thing as a free lunch, but you guys have me curious again!
http://www.freecalc.com/fricfram.htm
- Liquid Friction Pressure Loss
- Pressure Loss (psi): 6.11 Head Loss (ft): 13.8
- Line Number:
- Date: 7/18/2016
- Nominal Pipe Size: 0.75
- Pipe Schedule: SCH 40
- Flow Rate (gpm): 22
- Viscosity (cP): 1
- Specific Gravity (water=1): 1.025
- Temperature (F): 83
- Pipe Roughness (ft): 0.000016
- Actual Pipe ID (in.): 0.824
- Fluid Velocity (ft/sec): 13.24
- Reynolds Number: 86549
- Flow Region: Turbulent
- Friction Factor: 0.02
- Overall K: 5.06
- Piping Length (ft): 10
- Long Radius Elbows: 2
- Pipe Entrance: 1
- Pipe Exit : 1
There are lots of variables that measuring would account for, but while we're estimating I just thought I'd add this data point....not far off of what you calculated.
FWIW, from playing with the calculator at rc, the horizontal run seems like it is more or less inert compared to the effect of bends and vertical runs.
To keep it simple, I'm assuming 10' of head loss for the rest of this doc....
It seems like you're comparing the nominal ratings of these pumps. The curves are quite different between the pumps mentioned, so this is not an apples-to-apples comparison.
Have you measured the flow rate you're actually getting? (Either before switching to the Vectras or after switching?)
This is the only sure way to know – and easy to accomplish. @SteadyC can you do this?
At 10' up...
It seems like either the high-head Dolphin 6250 or medium-head 4750 would be a better comparisons...but the 4750 will do for us.
Iwaki
$387
1380 GPH is about what I calculate he'd be getting with the old Iwaki. There's no cross reference for power usage at that flow rate.
Dolphin
$450 on Amazon.
1380 GPH from the Amp Master comes in at around 125 watts and up to 11'.
10' will yield more like 1500 GPH at 130 watts.
Vectra
$350 x 2 = $700
1380 GPH from the M1 can be delivered up to 6'...presumably at 80 watts.
Interestingly, at 10' it will push almost 900 GPH
I'm guessing, but I assume the duo of Vectras runs at 160 watts to push up to the second floor? @SteadyC can you take a KillAWatt reading by any chance?
My Bet
Once actual flow and power usage are measured – I bet it's close to a wash.
lol. my 6,250 gph pump pulls less than 2 amps.
I am considering a 6250. From the spec sheet, looks like the pump draws a min of 480watts, which would be more lik 2 amps at 120v. How are you pulling less than 2 amps? What kind of head do you have?
Can you tell me ifi dial a 6250 back, can i get the same flow per watt that a barracuda would give me at 15' of head?ball valve my friend. ball valve. if you dial it back, itll drop the draw.
Their pumps are sweet tho.
I followed up by repeating my request for some data about what the expected power consumption might be when restricting the output to 2000gph at 15' of head, and hopefully I get a response. We'll see.