procon pumps

[MapleCamp]

Thinking of upgrading my home made RO system pump to a procon stainless 150 gph, and have a question about the rating of 150 gph . Im thinking that this refers to wide open unrestricted flow. Does any one have an idea what it would be pinched down to 150 psi.


thanks

[Bellehollow]

Procon style pumps are positive displacement rotary vane pumps. This means that there is a definitive amount of fluid with each revolution achieving the rated GPM. This pump curve changes very little with pressure up to the rated maximum. I run a pro con 240 that is rated at 250 PSI. The difference when u increase PSI is the work that the motor has to do under load, not the GPM as that should be similar along the entire curve. With a lower pressure, you should be working your motor less and increasing the workload as you get closer to that 250 PSI max rating. Anyone else feel free to correct me if I did not state any of that correctly.

[MapleCamp]

[QUOTE=Bellehollow;396598]I run a pro con 240

What do you run for motor hp for the 240

[Bellehollow]

3/4hp with a 1/2hp shallow well feed pump. The 3/4hp is slightly undersized when I push the 250 psi but works. Somewhere there is a procon chart that spells out motor requirement at different system operating pressures.

[carls47807]

A 140gph pump will do 128gph at 250psi (i'm not sure they make a 150gph series 4 or 5). The max horsepower on the 140 is .64hp.
The 240gph will do 228gph at 250psi, and max hp is .86.

[MapleCamp]

Are feed pumps required when using procon pumps or can they be gravity feed successfully?

[Bellehollow]

Not required as pro cons are self priming, but highly susceptible to damage when run dry. I would say highly recommended running a feed pump from what I have seen on here. Only caveat may be how much head pressure you have on your pump intake side.

[MapleCamp]

[QUOTE=Bellehollow;396607]Not required as pro cons are self priming, but highly susceptible to damage when run dry. I would say highly recommended running a feed pump from what I have seen on here. Only caveat may be how much head pressure you have on your pump intake side.[/QUOTE

I will be flooded on the suction as the feed tank is about 5 foot over pump. Would something like a surflo pump help?

thanks for the input

[Greg MacWilliam]

The larger procons series5 and 6 need a feed pump, the smaller ones run fine on gravity, the advantage of a feed pump is a low pressure switch to shut the whole system down you run out of sap

[bmbmkr]

here's the spec sheet from their website http://www.proconpumps.com/content/Series%205%20Pump_spec.pdf