You're comparing apples to oranges, GPH is flow volume, you can find many pumps that deliver enormous flow volume but can handle very little head pressure(PSI) Pumps for ponds and aquariums are this type for example. They need the volume of flow and most often to be submerged to remain cool. Too much back pressure will reduce the flow and cause overheating and burnout. This is partly why these are inexpensive as the parts need not be high heat/pressure rated to last.





To build your system you need to work backwards. First you need to determine the head pressure or PSI to operate your desired system. Starting with length/diameter of tubing, elevation from resevoir to emitters, number of elbows, emitters and the PSI rating of each emitter. Then you need to find the pump that can handle that PSI plus 25% for it to work and last. These pumps are more expensive to handle the higher pressure/heat.



You'll most likely be finding pumps rated X GPH at 1 foot of head. You'll need to determine your PSI/head pressure then contact the manufacturer of the pumps to find the one that will handle your system.
-----
Hope this helps.



BigT

There is a difference between ignorance and stupidity. The ignorant can be taught, stupidity is beyond our control.

[ Show Entire Thread ]