Pipe Flow Calculation
Pipe Flow Calculation
(OP)
I have a TOTAL of 200' of 1" pipe, the pipe runs along the floor at the baseboards on three walls, and doubles back mirroring itself. The outgoing pipe has 13 1" elbows.
The return pipe has 15 1" elbows.
The distribution pump feeding the loop is rated for 5 GPM.
The loop returns to a PRV on a 150 Gallon storage tank.
The sustained pressure on the pumps will be 60 PSI.
What is my actual flow rate?
Is this enough info?
Thanks
The return pipe has 15 1" elbows.
The distribution pump feeding the loop is rated for 5 GPM.
The loop returns to a PRV on a 150 Gallon storage tank.
The sustained pressure on the pumps will be 60 PSI.
What is my actual flow rate?
Is this enough info?
Thanks





RE: Pipe Flow Calculation
what type of pipe? new or old pipe?
what is the pressure drop from one end to the other?
are they 22, 45 or 90 degree elbows?
are there any other fittings such as tees on the line?
pumping water? at what temperature? is it clean water?
RE: Pipe Flow Calculation
+GF+ Poly, New pipe
Zero pressure drop with no equipment running
90 degree elbows, one 4' rise between two elbows
6 Tees with 1" Ball Valve attached (I have them closed)
From each Tee to the BV there is less than three inches negating a dead leg
Pumping RO water
77 degrees F
Does this help?
RE: Pipe Flow Calculation
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Pipe Flow Calculation
The flow rate will be whatever rate that you set on the PRV.
Note that your flow rate is too low for a 1" ultrapure water ditribution loop system. You should have a flow rate that allows a loop flow velocity of 3-5 ft./sec to minimize potential water quality problems.
RE: Pipe Flow Calculation
I called the Webber rep for Webtrol. The pump is Webtrol model # H5B6S16-3PH
The rep says 5 GPM but can be set as high as 10 GPM
I took the readings today with all the equipment running. The pressure at the pump was fluctuating between 50-60 PSI
The return to the tank was fluctuating between 30-40 PSI
The pump is connected from a 150 Gallon Storage Tank by way of 1" pipe.
Thanks
From this info and the info posted previously, are we able to calculate the GPM?
I need to add a 20" 0.03 Ultrafilter to this loop.
Will this present a flow problem?
RE: Pipe Flow Calculation
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Pipe Flow Calculation
RE: Pipe Flow Calculation
At the 60 PSI intersect it states 3 GPM
At the 50 PSI intersect it states 6 GPM
So am I correct in assuming that when the pump PSI is fluctuating between 50-60 PSI that the flow rate varies in between 3 and 6 GPM?
Is the pressure drop at the return to the storage tank attributed to the amount of fluid being pulled to the operating equipment?
Thanks
Thanks
RE: Pipe Flow Calculation
One would thing that the pressure drop at the return would be the sum of the PRV pressure drop plus the pressure drop attributed to the amount of fluid distributed to the equipment.
RE: Pipe Flow Calculation
Should I expect the pump PSI to rise? even slightly?
Should I be able to adjust the return to the tank accordingly and create more back pressure toward the Ultrafilter?
..........................................................
..........................................................
Do you think this would be a good thing to do?
1)Shut down the loop and all equipment
2)Add Ultrafilter
3)Turn on the pump adjust so complete loop pressure is 60PSI
4)Turn on equipment and set PRV accordingly
RE: Pipe Flow Calculation
You have 50-60 psi available. At that pressure, the ultrafilter manufacturer should be able to tell you how much will pass through the membrane.
If the headloss across the ultrafilter is too high, you may not get any flow across the ultrafilter.
It looks like the typical ultrafilter needs 20-30 psi pressure to operate. What will happen is that your pump operating point will slide to the left on the pump curve to compensate for the additional pressure loss through the filter (assuming that you are trying to keep the same flow).
As the pump operating point moves left, your pumped flow decreases while at the same time the pressure is increasing.