or just total head............
I read on a thread on this forum from over a year ago where mas 985 was discussing total head..
He went thru the technical calculations and then ( and I'm paraphrasing not quoting), gave a good guesstimate way to figure total feet of head....
He said to multiply the clean filter psi by 3-4 for total head....He said for 1 1/2 inch pipe to lean closer to the 4 ...
So then with my 1 1/2 inch piping and 12 psi clean filter,, 3 x 12 =36 and 4 x 12 = 48....
As I've stated in other posts, I have one 60 foot suction line from the skimmer...I also have one 40 foot suction dedicated line for an automatic cleaner, but I've never opened it or used an auto matic cleaner...
My 2 return jets are 20-25 feet from the pump...
I have a 100 Sq. ft. cartridge filter rated at 100 GPM max flow...
My current Centurion motor has a BHP of 1.2hp....
So is my guess of total head around 45 correct ???
I've done a ton of research and have found that even if 2 or 3 or 4 or 5 pumps have the same BHP, they can have vast different GPM to total head numbers on the curve...
mas 985 says to go with the lowest hp. that will do the job...Easier said than done....You really don't know for sure if a lower bhp
will do the job well until it is installed and then you are stuck with it...
I see that Jason Lion has a 20,000 gal. pool yet only has a 3/4 hp pump...My pool is 9,500 to 10,000 gal...1 1/2 inch piping.
I would love to go 2 speed, but only the whisper flo have the toggle switch on the motor..The other brands you have to install a special timer....Too much hassle and expense for that...The 3/4 hp whisper flo 2 speed has the toggle switch but only 115v.. I now have 230v and again do not want the hassel and expense to change it to 115v..
Every pool store that I call in my area says pipe sizing means nothing and go with a 1 hp to 1 1/2 hp pump.......But on checking all the curves on most of the 1 to 1 1/2 hp pumps, the GPM at 40-50-60 ft of head would be way too many GPM for me.
Taking into account that Jason Lion has a 20,000 gal pool and mas 985 says to go with the lowest yet efficient hp, I have narrowed my choices to the following single speed pumps...Dual speeds are out !!!
Whisper flo full rated WFE-2 1/2 hp, .95 BHP,,,
FT. of HEAD GPM
60 FT 40 GPM
50 FT 55 GPM
40 FT 67 GPM
30 FT 73 GPM
Sta- Rite Max E Pro
1/2 hp BHP .95
Ft of Head GPM
60 FT 30 GPM
50 FT 47 GPM
40 FT 55 GPM
30 FT 62 GPM
Sta Rite Max E Pro
3/4 hp BHP 1.23
Ft Head GPM
60 FT 55 GPM
50 FT 62 GPM
40 FT 70 GPM
30 FT 75 GPM
When I originally asked some of these questions, I had thought that I would get more and thorough responses...If I had the knowledge and expertise like most of you I wouldn't ask....
I do know about water chemistry, vitamins and Dog nutrition are my specialties...Not pool pumps and pipe sizing,,,but I am learning every day...
I hope you will have patience and offer your expertise...If not, I can always watch American Idol tomorrow nite....I heard that Paula reads this forum !!