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Old 05-07-2009, 07:34 PM   #1
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Default Type "K" copper fittings

Nobody seems to make them. What's the point of installing K pipe if the fittings are type L?
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Old 05-07-2009, 07:36 PM   #2
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Quote:
Originally Posted by Protech View Post
Nobody seems to make them. What's the point of installing K pipe if the fittings are type L?
I only install K copper underground in one full length from the B-box to the inside of the home. Once inside and above ground the requirement is back to Type L. So I never had the need for any fitting other than flare for underground work.
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Old 05-07-2009, 07:39 PM   #3
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Quote:
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Nobody seems to make them. What's the point of installing K pipe if the fittings are type L?
All fittings are made from type M copper actually, they are actually heavier wall than M copper from the wrot extrusion process, but they are made out of M copper.
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Old 05-07-2009, 07:52 PM   #4
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So you are saying that the actual wall thickness of the fittings are the same as the equivalent size K pipe or thicker in all water exposed parts of the fitting?
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Old 05-07-2009, 09:48 PM   #5
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I'm pricing a job now that is requiring all above slab water piping to be Type K. Not normal for this area.
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Old 05-07-2009, 09:59 PM   #6
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Again, why even bother with K copper if the fittings are thinner than the pipe? If anything I would want the fitting wall thickness a bit thicker than the pipe.

Almost every pinhole I ever repaired (hundreds) on hard copper was on the fitting not the pipe.

Soft copper is a different story.
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Old 05-07-2009, 10:12 PM   #7
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How about using cast brass fittings instead?
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Old 05-08-2009, 12:48 AM   #8
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The only reason I could see them wanting type K copper is for "longetivity." I did one job in Pitt Meadows SPH where they spec'd type K for the hot lines, and type L for the cold lines.

But if they want longetivity, they should spec Fusiotherm/Aquatherm Fusion Polypropolene. It does have a fire rating and it'll outlast Copper in a lot of applications.
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Old 05-08-2009, 08:46 AM   #9
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I've got an owner/builder who want a house built with copper. I've explained that copper doesn't do well here but they still want it. If I've got to do it in copper I at least want it to be hard copper and as thick as I can get it.

I have considered brass fittings but then I’ve got to worry about turbulence, casting defects, and dezincification.

They good thing is that the system is going to be fed well water with little or no chlorination. In this area, copper water systems last 50-60 years on well water and 15-30 on city water. I’m just being ultra cautious as I make my living removing copper and putting in PEX and I now have a HO making me put copper in. I’m only going to give a 10 year warranty on the copper no matter what kind goes in so it’s not a liability thing; it’s a being able to sleep at night thing.
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Old 05-08-2009, 12:06 PM   #10
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Nibco's website states

Q: Copper tubing wall thickness is designated “K,” “L” or “M.” What
are the copper fittings applicable to?
A: Copper fittings’ wall thickness is determined by standards (ASME
B-16:22 and MSS-SP-104). These standards address minimum wall
thickness (per size) for the full range of copper fittings and are not
intended to match tubing wall thicknesses.
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