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  #1  
Old 07-20-2011, 08:10 AM
ZX12R ZX12R is offline
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Funny pipe length

Last week I saw an irrigation company doing an install on a new house. On a few locations,he was leaving almost 3 feet of funny pipe from the lateral to the sprinkler head. Is not that a bit much? I was under the assumption that 18" was the max that you should go.
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Old 07-20-2011, 08:15 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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Were they near curbs or driveways? If so I'd say that is a pretty good decision. I'm not sure there is a limit to a funny pipe run except following the rules of basic hydraulics.
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Old 07-20-2011, 08:18 AM
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Wet_Boots Wet_Boots is offline
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the loss in the funny pipe fittings exceeds the loss in the pipe itself, for a 3 gpm head - you could have a ten foot run and no problems
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Old 07-20-2011, 08:20 AM
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DanaMac DanaMac is online now
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Not sure there is any "rule", other than "use as much as you need to as long as it works"

Seriously though, on installs I think 18"-24" should be max. I have seen, and even done it myself, where when adding a head due to someone else's poor installs, I will run 3'-5' of it. But very rarely. Bash me all you want Leary, but it gets the job done.

I have also fixed other people's screw ups where they have tried running an entire zone on swing pipe, or just 3-5 additional heads off of it.
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Old 07-20-2011, 08:25 AM
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Sprinkus Sprinkus is offline
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Makes sense to do that at the bed edging 'cause the LA is gonna end up moving that edger at least twice.
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Old 07-20-2011, 08:25 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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Couldn't find any info at the TORO site but RB says this:

Place lateral pipe into trench, measure
the distances between the heads as
indicated on the original design. Lay out
swing pipe from head back to the point
of lateral pipe connection (saddle tee,
PVC, or poly fitting). Cut swing pipe and
install in trench. Design calculations for
pressure loss should be considered when
using lengths longer than 36 inches. PVC
or poly tee, or elbow, should be at a 90º
angle to the finished grade.

80psi max as well. I've used funny pipe in drip or micro spray situations when I needed a more durable pipe for parts of the runs.
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Old 07-20-2011, 08:40 AM
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Wet_Boots Wet_Boots is offline
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a Toro catalog will have a table for funny pipe friction loss, and we have this old thread
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Old 07-20-2011, 08:56 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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Ahhh the early dazes of LS. Some real snippy there.
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Old 07-20-2011, 09:15 AM
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Dripit good Dripit good is offline
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We're guilty of 24" or longer runs of it.

What you don't want to be guilty of is roughing in 36" of it and trimming off 12" of waste.
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Old 07-20-2011, 10:46 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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You don't have a bucket for FP trims? If its 6" or longer I toss it in the truck to be found later and used.
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