So my suction gauge reads 9 in Hg, my filter gauge reads 17 PSI and my flowmeter reads 80 GPM using my 1.5HP Jandy Stealth pump for my system circulation. According to this:
TDH = Hsuction + Hdischarge
= (1.13x9) + (2.31x17)
= 49.44 ft head
So then I pull apart my discharge line and rebuilt it, making it more efficient by eliminating my heater, backwash valve and removed most of my 90's and used 2 45's when I really needed a 90 elbow. I hooked up the same pump and presto! My pump IMMEDIATELY pulls more water, just by site alone. My new flowrate is higher @ 105 GPM and my filter pressure drops to 13 PSI. But my suction head reads higher @ 13 in Hg (i.e. MORE suction). I guess this can be expected since my flow has not remained constant but increased. So my DYNAMIC head pressure rises with increased flow rate. According to my new setup:
TDH = Hsuction + Hdischarge
= (1.13x13) + (2.31x13)
= 44.72 ft head
Did I do this right? Because when I go to the Jandy pump curves online (link is http://www.jandy-downloads.com/pdfs/SHP_curve.pdf) , 90 GPM correlates to 68 ft head and 105 GPM correlates to 62 ft head. So why don't these curves show the feet of head that I calculated? Am I using these pump curves incorrectly?
TDH = Hsuction + Hdischarge
= (1.13x9) + (2.31x17)
= 49.44 ft head
So then I pull apart my discharge line and rebuilt it, making it more efficient by eliminating my heater, backwash valve and removed most of my 90's and used 2 45's when I really needed a 90 elbow. I hooked up the same pump and presto! My pump IMMEDIATELY pulls more water, just by site alone. My new flowrate is higher @ 105 GPM and my filter pressure drops to 13 PSI. But my suction head reads higher @ 13 in Hg (i.e. MORE suction). I guess this can be expected since my flow has not remained constant but increased. So my DYNAMIC head pressure rises with increased flow rate. According to my new setup:
TDH = Hsuction + Hdischarge
= (1.13x13) + (2.31x13)
= 44.72 ft head
Did I do this right? Because when I go to the Jandy pump curves online (link is http://www.jandy-downloads.com/pdfs/SHP_curve.pdf) , 90 GPM correlates to 68 ft head and 105 GPM correlates to 62 ft head. So why don't these curves show the feet of head that I calculated? Am I using these pump curves incorrectly?