I am undertaking a DIY pool project and have been reading quitea bit about the plumbing – trying to make it perfect and save me money and hasslein a long run. Still, tubes seem little undersized after the calculation andwanted to make sure I am not missing anything before putting the piping down.Here are the details and thanks for your help:
Pool is in-ground relatively small: 12x18x5 with total of 8,000gallons. Two turnovers of 16,000 over 16 hours (8 hour for eachturnover) comes out to about 1,000 GPH = 17GPM.
I was looking at the Steve Gutai’s article (http://watershapes.com/pools/spas/water-under-pressure-2.html)about water flow speed and pressure considerations that recommends the averagewater speed at 6fps and according to the chart in the article, I need:
· 1 ¼ pipe for main feed (4.29fps at 20GPM) (thechart says 7.29 but it seems a typo comparing to numbers before and after).
· Then, ¾ pipe for secondary feed (6.02fps at10GPM)
· I do not even have a size for a tertiary feed (that will loop around the pool) orthe outlets (should I use ½” for tertiary and then ¼” for outlets?)
1) Should I simplify the layout by getting rid of secondary feed and use 1 ¼” as the primary feed that connects to the 3/4" loop that goes around the pooland use ¼ for outlets?
2) Irrespective of the two proposed layouts, these tubesizes seem too small but, at the same time, wanted to make sure the flow was ata recommended level. Are my size calculations correct? Should I be so concerned about keeping the flow rate around 6fps or can it tolerate much slower speeds?
Thank you so much,