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  #1  
Old 08-28-2013, 10:24 PM
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RhettMan RhettMan is offline
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Unions Vs. Slip-Fix for repair situations

I like that unions seem to hold the pipe "steady-er"

I like that Slip-Fixes are easy.

But I'd like to hear your thoughs on advice on when to use one, and when to use the other, in certain and differing situations.

Please sirs
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Old 08-28-2013, 10:39 PM
bcg bcg is offline
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Slip-Fix on laterals, fix the pipe on the main (usually do 4 90's or 4 45's or dig and use a couple of couplers). I don't typically use unions except for larger valves (1.5" and up) or occasionally for a backflow.
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Old 08-28-2013, 11:25 PM
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RhettMan RhettMan is offline
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thx , before i forget i also want to ask:

if one were to tighten a union to the best of his hand-tightening ability, what PSI might it be expected to hold? (specifically: at the gasket-compression point)?
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Old 08-29-2013, 06:20 AM
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Wet_Boots Wet_Boots is offline
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depends on who made them - get KBI sch 80 unions
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Old 08-29-2013, 10:10 AM
Kiril Kiril is offline
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Quote:
Originally Posted by Wet_Boots View Post
depends on who made them - get KBI sch 80 unions
I prefer spears unions myself.
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Old 08-29-2013, 11:04 AM
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Wet_Boots Wet_Boots is offline
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KBI, pre-buyout by NDS, was my go-to choice, as I could get them by name, and the union threads are larger in diameter than most, and that makes them stronger. Suppliers are just as likely to have a made-in-China sch 80 union in the shelf cartons these days.
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  #7  
Old 08-29-2013, 12:06 PM
SoCalLandscapeMgmt SoCalLandscapeMgmt is online now
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The Nibco slip-fix are the best IMO. I've been extremely disappointed with the Spears slip fix type repair couplings. We've had a large number of them fail in the last year, mostly from cracking and splitting. This is surprising given that Spears makes the best PVC fittings in the industry. We pretty much use slip fix for all lateral and main line repairs from 1" all the way up to 3". Depending on the situation we will occasionally repair a main with a union or by building a bridge out of 90's but that's mostly when we are dealing with large trees and we don't want to disturb or cut the roots. The thing about slip fixes (as I'm sure you all know) is that they have to be absolutely straight. They cannot have even the slightest bend or they will leak or crack. If you keep them straight and you measure everything precisely then they will pretty much last forever.
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Old 08-29-2013, 03:19 PM
ArTurf ArTurf is offline
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Regarding expansion couplings, do you install them mid or full extension?
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  #9  
Old 08-29-2013, 05:03 PM
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Mike Leary Mike Leary is online now
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full extension?
With changing velocity, that slip-fix will move around. Best to measure and get it fully extended. That said, I still like unions or 90 ring-arounds.
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  #10  
Old 08-29-2013, 05:39 PM
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greenmonster304 greenmonster304 is online now
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Recently we did a job where we pulled in 1200' of 2" PVC mainline with wire. We glued up 200' sections the day before. We dug pits and used sch 80 KBI unions to join the 200' sections. I just didn't want to install slip fixes on a brand new system.
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