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Monday, July 2nd 2012, 1:03pm

Use of 90 elbows

Hello. This is my first project and I am having one heck of a time trying to install my valve manifold to the poly pipe. This started as a repair of the mainline manifold and now is a replacement...May I install 90 degree elbows at the valve outlet (1" FIPT) and a barb fittings at the the poly pipe (1") WITHOUT sacrificing flowrate? It is the only way I can figure out to get the manifold barbs into the 5 poly pipes. There is not enough 'play' in the ends of the poly pipe in the valve box. Thanks.


Monday, July 2nd 2012, 1:31pm

There is a point where theory gives way to practical.
If your pressure and flow are anywhere near where they should be then the fitting loss will be ok.


Monday, July 2nd 2012, 2:43pm

:thumbup: thanks much.


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Tuesday, July 3rd 2012, 8:00am

You may be able to use 45?


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Posts: 5,287

Location: Metro NYC


Wednesday, July 4th 2012, 2:11pm

One way to take the mystery out of fittings is to look at them as being equivalent to a certain length of pipe the same size - there are tables of these equivalencies


Thursday, July 5th 2012, 8:12am

Here is the fitting equivalency chart boots was talking about.
Look at bottom of page

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