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 Posted by: smd79 ® 01/27/2005, 09:10:23 Author Profile Mail author Edit hello, im trying to choose a pump for a water system im putting in place. so far i have determined the pressure loss of the system to be 45' assuming a flow rate of 350 gpm in 4" pipe (sch40).how do i procede further? how do i determine what pump size i should be looking at? how do i use this data on the pump charts to determine the best pump?answers to any or all of these questions will be greatly appreciated. Thank you,Shawn.

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 Posted by: matin ® 02/09/2005, 02:11:10 Author Profile Mail author Edit Use software from Engineered Software "pump-flo" it handles all the pumping scenarios very nicely

 Re: PUMPS Re: PUMPS -- smd79 Post Reply Top of thread Forum
 Posted by: smd79 ® 02/01/2005, 08:25:57 Author Profile Mail author Edit thanks for all the input guy. you've been a great help.i was wondering if anyone knows a good reference chart for friction losses in fittings. what are the equivalent lengths for stainless ball valves, elbows, and tees?angain all input is greatly appreciated. Thank youShawn.

 Re: PUMPS Re: PUMPS -- smd79 Post Reply Top of thread Forum
 Posted by: khaldoun ® 01/29/2005, 05:00:12 Author Profile Mail author Edit helo shawn; when you first study a pumping systems you should begin with two assumption the velocity of the water into the pipe and the flow rate from them you determine the pipe size from the quation V=Q/A where V(velocity m/s)- Q(flow rate m*3/s)- A(pipe size m*2) then you calculate the presure loss on the base that pressure loss=200pa/m , After that from the catalogues of pumps manufacturers you chose the appropriate pump by crossing the flow rate value with pressure loss value on the chart , if you don't get a specific point on the chart Imean on a specific curve you chose the closest curve and it's recomended to chose the one upper to your point. hope that I was able to give you the help. Khaldoun.