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Old 05-26-2006, 06:21 PM
burlap burlap is offline
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Length of Funny Pipe

This will be my first experience with funny pipe. I have 1/2" Rainbird pipe and marlex street eels. What determines the length of the pipe? I tried 18" and think that is too unwieldy. A 4-6" piece will work fine- my trench will be 12" and that comes naturally with the Hunter PGP. How much adjusting will be necessary in an unobstructed trench? I didn't think the 18" gave me much flexibility and had to double it back because it wanted to follow its curve. Thanks, burlap
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Old 05-26-2006, 06:38 PM
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Wet_Boots Wet_Boots is offline
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Are you using poly pipe or PVC? Poly can allow you to use very short lengths of swing pipe, if you install a marlex ell in the head. Between the marlex, the MPTxBarb elbow, and a 3/8 ('funny pipe') side outlet insert tee, the swing pipe itself doesn't need to contribute any flex to the assembly.
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Old 05-26-2006, 07:13 PM
burlap burlap is offline
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Length of Funny Pipe

I'm using 1" pvc with the street eel coming out of the side of the 1" tee. I can't think of how much adjusting I would need to do over the years other than an up or down adjustment which the short length will allow for. burlap
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Old 05-26-2006, 07:35 PM
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Wet_Boots Wet_Boots is offline
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With PVC, you need a bit more pipe, since you don't have the insert fitting to help out. So, if you have the funny pipe terminating with a barbed elbow at both ends, a foot should be plenty. I would avoid assuming that a barbed elbow threaded into a sch 40 fitting will move freely a few years after installation. (but wait to hear from PVC guys)
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Old 05-26-2006, 08:18 PM
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PurpHaze PurpHaze is offline
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We don't use funny pipe because we build our own swing joints out of Marlex 90s and SCH 80 nipples. We use 6" SCH 80 nipples with 1/2" inlet sprinklers and 8" SCH 80 nipples with 3/4" and 1" inlet sprinklers.
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Old 05-26-2006, 08:56 PM
burlap burlap is offline
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Length of Funny Pipe

I'm having trouble visualizing what you're telling me. My problem is that whatever length I make the Rain Bird funny pipe translates into lateral distance. A 12" length means the head will be 12" up stream, down stream, or to either side of the tee. It just seems a shorter length would be easier to work with if I want to set the head into the side of the trench where I can secure it into the side rather than the backfill. Sorry to be so dense about this, burlap
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Old 05-26-2006, 09:15 PM
greenhorn123 greenhorn123 is offline
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6-12 inches will be fine.

if its shorter than 6 inches the head tends rise a bit over time. you can use more if you need.
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Old 05-26-2006, 09:54 PM
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PurpHaze PurpHaze is offline
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We don't use funny pipe. With proper backfill and compaction around the swing joint the sprinkler will not rise, drop or tilt.
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Old 05-26-2006, 10:22 PM
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What lateral distance? If you use a SxSxFPT tee, and thread a funny pipe elbow into that tee, and point the barbs in the direction of the pipe, then the funny pipe runs alongside the PVC. This would mean the sch 40 tee will be about a foot away from where the head gets located.
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Old 05-26-2006, 11:41 PM
phototropic1 phototropic1 is offline
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Quote:
Originally Posted by Wet_Boots
What lateral distance? If you use a SxSxFPT tee, and thread a funny pipe elbow into that tee, and point the barbs in the direction of the pipe, then the funny pipe runs alongside the PVC. This would mean the sch 40 tee will be about a foot away from where the head gets located.
Exactly. You have to account for this when you glue your tee. Offset the tee about 7-8 inches or so from the point where the head will be, attach an elbow barb to the tee, funny pipe, elbow barb, street el, then head. Voila! We use about 12" of funny pipe (actually, the length from the hand to the elbow of the employee who is cutting it) for each head.
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