Total Dynamic Head TDH

[mas985]

What you are trying to do is not easy. I have tried it myself and found that there is a lot of error involved in calculating head. First, not all PVC fittings are created equal. Friction coefficients can be quite different for different manufactures. There are sites that can give you some information but there is still quite a bit of uncertainty. Skimmers, three port valves, main drains etc. are not characterised well.

Do you plan on using Darcy-Weisbach or Hazen-Williams equations? Even that choice will give you different answers.

If you don't recognize either of those, then you may want to start here:

http://www.poolplaza.com/pool-pump-sizing-2.shtml

This is pretty much rule of thumb but if you don't want to get into the details, then it may be your best choice.

Also, for 8 hour turnover, you don't need more than 80 GPM. A good guess for your plumbing would be around 50 feet of head.


More detailed information:

http://www.haestad.com/library/books...tml/wwhelp.htm

http://www.engineeringtoolbox.com/da...ion-d_646.html
http://www.engineeringtoolbox.com/ha...ter-d_797.html
http://www.mcnallyinstitute.com/Char...on_valves.html
http://www.mcnallyinstitute.com/Char..._fittings.html