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  #21  
Old 05-30-2011, 10:23 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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I'm no expert on 4" pvc installation. Repaired it many times though. Whatever super expensive is repairing 4"pvc is a PIB. I'd follow Sprinkus advice myself.
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  #22  
Old 05-30-2011, 10:24 AM
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gasketed mains have some wiggle room to expand and contract
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  #23  
Old 05-30-2011, 11:40 AM
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Sprinkus Sprinkus is offline
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3" class 200 pipe will safely do around 120 gpm.
3" sch 40 will do around 110 gpm.
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  #24  
Old 05-30-2011, 05:46 PM
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Quote:
Originally Posted by regularguy View Post
Okay, thanks everyone for the replys, it sounds like schedule 40 is simply also rated for DWV
There are 2 Sch. 40's - one is for sewer, usually is also marked "cellular core".
We somehow wound up with a piece on this on a truck, and when it was used to repair a broken main off a 7HP submersible... tech got to do the same repair twice.

That cellular core stuff will work fine as a sleeve, tho.
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  #25  
Old 05-30-2011, 05:49 PM
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Quote:
Originally Posted by Sprinkus View Post
3" class 200 pipe will safely do around 120 gpm.
3" sch 40 will do around 110 gpm.
Yup, no need to go to 4" or use gasketed. And if the main is looped you could even argue for shrinking it to 2-1/2".
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  #26  
Old 05-31-2011, 05:59 AM
koster_irrigation koster_irrigation is offline
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You need to go with a gasketed pipe for that size and flow, and yes if you are looping it, you can def. downsize it. Pull out a flow chart and check your flows.
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  #27  
Old 06-01-2011, 06:32 PM
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Thanks everyone for the suggestions.

I guess my next question is if I install a 3 inch pvc main line and only push 30 GPM through it in the short term the water velocity will be very low, will low water velocity be an issue?
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  #28  
Old 06-01-2011, 07:00 PM
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Thanks everyone for the suggestions.

I guess my next question is if I install a 3 inch pvc main line and only push 30 GPM through it in the short term the water velocity will be very low, will low water velocity be an issue?
slow supply (flow) isn't a concern as long as your pressure is sufficient for proper operation of your systems components. Dont worry about maximizing the potential of the pipe.
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  #29  
Old 06-01-2011, 07:15 PM
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Quote:
Originally Posted by hoskm01 View Post
slow supply (flow) isn't a concern as long as your pressure is sufficient for proper operation of your systems components. Dont worry about maximizing the potential of the pipe.
Well said. Anyone who thinks they can even get close to the "five foot a second rule", especially on piping systems over 1 1/2" is not only nuts, but might as well be either a REP or sell shoes. In other words, I'd be designing a system with a 3" main to a max flow of around 60 gpm, my friction loss would be almost zilch and I'd be way under the velocity rule.
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  #30  
Old 06-02-2011, 09:25 AM
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I came into this late and didn't read all of the posts . . .

When joining 4" pipe you must bevel and clean the joints thoroughly prior to application of the solvent weld.
Use 721 or higher temperature solvent weld.
Have at least a ten pound mallet available with a 1" thick piece of pressure treated wood as a striking plate. There is no way you will be able to join the pipe into the socket by hand so use the strike plate and mallet to "tap" the pieces together.
You'll hear a completely different sound once the pipe bottoms out in the socket.

Also, be sure to immediately clean all solvent weld that may have squeezed out of the socket. I use a water soaked mechanics rag - in fact I keep a small pail available so after each joint the rag is immersed in the pail. Helps to keep the rag pliable as well as removing the inevitable soil particles that collect on the rag so each clean up is done with a relatively clean rag.

All direction changes MUST be thrust blocked, for this I have a gas powered chop saw and a supply of narrow blocks. I cut the block to fit at least six inches past the side of each joint and use a piece of pressure treated wood as a buffer to prevent vibration related leaks from developing.

Working with larger pipe isn't difficult - you just need to be set up properly.
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