1. I replaced some PVC over the weekend, and though the old line says 1″ pvc, it was ever-so slightly larger than the new 1″ fittings I wanted to use. Maybe with cement as ‘lubrication’ it would have fit together (?), but I ended up sanding down the outside of old, inside of new so I could pre-fit the pieces. Am I missing something here….are there different outer diameter sizes that were once (or are now) standard? How do I tell beforehand if a 1″ pvc is really 1″ or slightly larger?
Thanks.
Jeff
Replies
PVC will be tight enough that it won't fully seat without glue (which "melts" the pipe a bit).
I wouldn't sand them down, since the glue is really a solvent and the joints rely on a tight plastic-to-plastic fit for proper joining. In cases where I want to dry fit, I'll often use dish soap to get them to go together, and the fully clean the soap off pior to assembly and gluing.
FWIW, I've never had pipe too large to go into a glued fitting. I've had a few fittings that were a bit loose that required some care to glue properly, but never a big pipe/small fitting.
Mike Hennessy
Pittsburgh, PA
Mike,
Thanks....I know the fit should be tight, but something is a bit different. The new PVC line and fitting(s) are a snug fit, but can be slipped together before glue (as I've always done). I couldn't even force the old line and new fitting together without sanding.
Jeff
are trying to use a gasketed fitting????
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"Some days it's just not worth chewing through the restraints"
You never know these days. Where did you buy them?
Go to another store with fittings and tubing in hand and check.
With them in hand it is a go/no go way of finding out.
Thanks guys:
IMERC-
Nope, not a gasket fitting.
POPAWHEELING-
The new fitting(s) were from different manufacturers and stores, they are all interchangable and fit new PVC line, but none of them fit the 'old' PVC line.
Guess I'll just assume this is isolated case. Fortunately there's not much PVC in the house, so next time I'll just replace the rest of the line. Thanks again.
This is another plot by the manufacturers, just like the 1/8s that keep disappearing from 2x4s and that 1/32" from sheet goods.
Steal enough of those fractions and pretty soon you have something.
Joe H
Those eigths and thirty seconds are simply because the metric size is a bit smaller (12mm vs 1/2", 18mm vs 3/4")
As for the original pipe question, are you mixing up PVC and CPVC?
I do a lot of PVC stuff and it always seems to fit fine, even mixing brand new with stuff 30 years old
Joke?
As to the metric, 1/2" CDX has no reason to be metric, it's just another few sheets made from the same amount of original material.
Think 2x4s need to be 1 5/8 x 3 1/2 to fit some metric blueprints?
Steal enough 1/8s and 1/16s and pretty soon your way ahead of the game.
As to the OP, who knows why it doesn't fit?
Joe H
That CDX is probably made in China and they are metric
All pipe made to IPS size has the same outer diameter, whether it is steel, brass, PVC, CPVC, aluminum, stainless steel, or whatever. Even rigid electrical conduit (i.e. schedule 40, not EMT) has this outer diameter. For 1" pipe this is 1.315". So any of your slip on plastic fittings (technically called socket fittings), should fit on the pipe.
The reason the o.d. of all IPS pipe is the same is so that any can be threaded with the same thread size and dies, and all threaded fittings are interchangeable.
Pipe of different materials and "schedules" (i.e. strengths) have different wall thicknesses, and thus the inside diameters are different.
Some pipe is not made to IPS size. Drain pipe is often not. So you could have a 4" plastic schedule 40 pipe, which would be made to IPS size, or a 4" plastic DWV (Drain, Waste, Vent) pipe which would not be. Fittings to fit IPS pipe are not interchangeable in size with DWV pipe.
Copper pipe is not made to IPS size. The actual outside diameter of copper pipe is 1/8" larger than the nominal diameter. For example, 1/2" copper pipe has an outer diameter of 5/8"; 3/4" copper pipe has an outer diameter of 7/8". When industry came out with PVC and CPVC to substitute for copper, they matched the copper sizing. So a 3/4" PVC pipe made to substitute for copper would be 7/8" o.d., which is different than a 3/4" PVC pipe sized to substitute for iron or any other pipe made to IPS sizing.
Here's what might have happened to you. The pipe could have been 1" IPS, which has an o.d. of 1.315". The fittings could have been for 1" copper sizing, which would fit a pipe having an o.d. of 1.125". So you would have about 3/16" interference. It might also be that either the pipe or the fittings were for DWV pipe.