Which diameter PVC for a long run?

Ryfq

Member
May 13, 2018
7
Hendersonville, TN
Hello all.

I'm looking to hard plumb our pool this year. I've been scouring all of the great information on here (there is a TON). One point I keep flip-flopping on is what size diameter PVC to use. The PVC run will be around 60' in length. I see most people say 1-1/2 is plenty, but then I see things about keeping water velocity below 6ft/sec on the suction side. Unless I'm confused, this may warrant 2" PVC because I think my 1.5 HP pump may be oversized for our 18' AGP. Hopefully one of you smarter people can help me out on this one. Here are the relevant details:

18'x54" Saltwater 8000 Round Pool
Hydrotools Cartridge Filter System 1.5HP Pump
PVC run length: 60'
Pump will be approx 3 feet higher elevation than pool.

Thanks very much.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
37,031
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Pump will be approx 3 feet higher elevation than pool.
Your pump is an Above Ground pump system. It is not self priming. So the pump must be located below the surface of the pool water to operate.
 

Ryfq

Member
May 13, 2018
7
Hendersonville, TN
Your pump is an Above Ground pump system. It is not self priming. So the pump must be located below the surface of the pool water to operate.
Right. I guess I got a little hasty in throwing measurements around. I was measuring from the ground at the base of the pool where it sat last year. So the pump will actually still be at least a foot below the surface of the water.
 

JamesW

TFP Expert
Mar 2, 2011
23,910
1.5 hp is too much for a single skimmer.

I would have at least two skimmers with 2" pipe to the pump or downsize the pump to about 3/4 hp.
 

Ryfq

Member
May 13, 2018
7
Hendersonville, TN
Ok. Thanks. I don't think adding another skimmer would be a good option. So with a single skimmer, a 3/4 hp Pump, 1-1/2" PVC would be good? Or still 2" with 3/4 hp pump?
 

JamesW

TFP Expert
Mar 2, 2011
23,910
Ok. Thanks. I don't think adding another skimmer would be a good option. So with a single skimmer, a 3/4 hp Pump, 1-1/2" PVC would be good? Or still 2" with 3/4 hp pump?
I would do a 3/4 hp with 2" pipe or maybe a 1 hp two speed and just use the lower speed.