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The last 10 posts

Thursday, April 19th 2007, 5:31am

by e654562

Actually.. this is the right one for my area.. I spoke to the town and water authority and they informed me of this... THanks for the info

Thursday, April 19th 2007, 5:06am

by sprinklerdr

I'd have to agree with Wet Boots on this one. Sure would hate for you to install the backflow and then come home and your water was off because it's not the right one for your municipality. Heck, here in Columbus there are at least six different variations on code and enforcement, all based on the municipal code.

Should you decide to go with it, another option is to use 3/4 into the bottom of the backflow and then use a 3/4 sweat x 1" MIPT copper adapter as your transition to 1" on the inlet side, then 1" out.

Monday, April 16th 2007, 5:25am

by HooKooDooKu

Based on what I've learned at www.irrigationtutorials.com, the only thing to consider between a 1" v. 3/4" backflow is pressure losses. Each backflow will have a different pressure loss graph (pressure loss v. flow rate). These graphs are NOT strait line graphs. They actually are very curvy, and frequently have a "sweet" spot where they lose the least amount of pressure. If the flow rate is higher or lower than the "sweet" spot, there will be a greater pressure loss. Now sometimes these pressure losses don't amount to much of anything, and if you've got pressure to spare, then you don't care. If you are borderline in having enough pressure to work with, then you'd want to review these pressure charts. Most manufaturers have them availible on their web sites. Well, I assume they do. When I was looking into WATT back flows, I had no problem finding them, and I THINK I even found Febco at one time too.

Sunday, April 15th 2007, 12:06pm

by Wet_Boots

I'd say use it in good health, but if you haven't figured that out by now, I would be politely inquiring whether you actually know whether this gift backflow preventer is of a type that is actually approved for use in your state/town/whatever ~ A Febco 850 is a Double Check Valve Assembly, and those are not toxic-rated, and are therefore unusable where protection from possible toxic backflow is required. Learn what the plumbing codes/laws are where you live, then make your decision.

Sunday, April 15th 2007, 11:16am

by e654562

Sorry to be stupid about this. does that mean yes or no.. A friend of mine gave me a 1" today for free and wanted to know if it would be ok to use. i figured it should be fine since all valves and manifold are 1"..

Sunday, April 15th 2007, 6:15am

by Wet_Boots

About as much as it would hurt to use inch-and-a-half. Understand that many backflow preventers of the 3/4" and 1" sizes are actually identical castings, only differing by the size of the pipe thread and valves on the unit.

Saturday, April 14th 2007, 4:57pm

by e654562

would it hurt to u se 1"

Saturday, April 14th 2007, 3:35pm

by Wet_Boots

Three quarters. Backflow capacities are way beyond those of the pipe sizes they possess, just like water meters.

Saturday, April 14th 2007, 12:01pm

by e654562

No.. the feed after the meter is 3/4".. I could change the T in the 3/4" and convert to 1".. or I could leave the current T which is 3/4" all around.. which way is best?

Saturday, April 14th 2007, 5:53am

by drpete3

is it 1 inch coming into you back flow? It wont hurt to use 1".