I have an old SP2607X10 superpump. I replaced the original 1 speed motor with new 2 speed STS1072RV1 one and now I would like to figure out the flow rates and wattage for the new configuration.
I’m getting a vacuum gauge so using filter pressure and vacuum readings I will be able to figure total dynamic head. I assume that the head curve for high speed will be the same as old SP2607X10 superpump had – the impeller is the same, the pump wet end is the same and the motor will spin it at the same 3450 rpm provided there is no slippage. Since the new motor is 1.125 SFHP and the old one was 1.1, there shouldn’t be any. Using the old superpump head curve, I could find the flow rate by intersecting total head and the curve. So far so good.
Now for the low speed things are a bit more difficult. Superpump has a 2 speed version - SP2607X102S. The motor is 1 SFHP (not sure about low speed), which is close enough, but the pipe size is 2†instead of 1.5â€. I would think it would make an impact on the head curve. On other hand, 1.5SFHP version has a low speed curve that is not that different from 1 SFPH (see the pic attached)! So maybe the head curve for SP2607X102S would be close enough for my case?
Now for the wattage. My assumption is that using numbers referenced above it’s not really possible to get the running wattage for the new pump on hi/low speeds, is it? If head curve is determined by wet end only then it doesn’t really matter if water is moved around by energy efficient motor or not, the flow rate will be the same. So is there a good way to figure the wattage out? Besides amp clamp and watching electric meter spin?
Thanks!!
I’m getting a vacuum gauge so using filter pressure and vacuum readings I will be able to figure total dynamic head. I assume that the head curve for high speed will be the same as old SP2607X10 superpump had – the impeller is the same, the pump wet end is the same and the motor will spin it at the same 3450 rpm provided there is no slippage. Since the new motor is 1.125 SFHP and the old one was 1.1, there shouldn’t be any. Using the old superpump head curve, I could find the flow rate by intersecting total head and the curve. So far so good.
Now for the low speed things are a bit more difficult. Superpump has a 2 speed version - SP2607X102S. The motor is 1 SFHP (not sure about low speed), which is close enough, but the pipe size is 2†instead of 1.5â€. I would think it would make an impact on the head curve. On other hand, 1.5SFHP version has a low speed curve that is not that different from 1 SFPH (see the pic attached)! So maybe the head curve for SP2607X102S would be close enough for my case?
Now for the wattage. My assumption is that using numbers referenced above it’s not really possible to get the running wattage for the new pump on hi/low speeds, is it? If head curve is determined by wet end only then it doesn’t really matter if water is moved around by energy efficient motor or not, the flow rate will be the same. So is there a good way to figure the wattage out? Besides amp clamp and watching electric meter spin?
Thanks!!