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Over 100,000 Threads 500,000 Plumbing Posts
Plbg.com also known as the PlumbingForum.com. The popular plumbing tips, remodel and advice forum and blog. Ask any toilet, sink, faucet, pump, water quality and plumbing related questions.
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Author:
packy
got to do a repair on an RV. CPVC piping needs some repiping. the directions on the CPVC flowgard one step cement say to prime if local codes require it? so, to prime or not to prime?
all pipe and fittings are brand new and nice and clean.
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Author:
hj
I prime because even if it is "not needed" it could still make a better joint, and does not take that much time. At least it is less time than taking a compression nut off and lubing the threads.
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Author:
Wheelchair
I agree.
Best Wishes
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Author:
vic
If "good enough" is good enough then don't prime ...... however if you believe in doing the "best" job possible then I say prime it (which is what I'd do if I were you).
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Author:
HelpMePlumb (FL)
I keep my primer in the same plastic box as the cement. It's so very easy to just do a quick prime - never have to worry about "local codes" - and probably get an optimal weld at the same time.
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Author:
sidejob bob (FL)
i never prime any type of pvc water lines
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Author:
hj
Then you must be one of the guys whose underground separated PVC joints I have to fix very frequently. Why are you in such a hurry that you cannot take a couple of seconds to prime the joint, AND if you were in this area ALL of your joints would fail inspection unless you went around afterwards and daubed the purple primer on them to make the inspectors happy.
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Author:
bernabeu (SC)
what part of 'sidejob' do we not understand?
?licensed?bonded?insured?
?1/2 soles?
yeeeegads ..... ?bragging 'bout bein' a shoemaker!
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Measure twice, cut once.
Retired Plumbers Local Union #1
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Author:
SwimRunPlumb (MI)
I did all of the mains for an apartment complex in Flowguard Gold and did not prime a single fitting, and did not have any problems either. The MANUFACTURER states that you do not need to prime them, so why would you.
Don't most of you tell others to follow the manufacturers instructions for everything else? Why would this be any different.
You can all claim that it is better to prime it, but there is no proof of that.
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Author:
hj
Many times, manufacturer's instructions are written by someone who used someone else's descriptioo of the task and has never done it himself. The "proof" that primer is needed would be when a connection failed, regardless when it happened. I have a large diameter PVC pipe, school system which was put together without primer and every year or so, we find a joint which has been leaking for a long time and finally wears a groove in the joint for the water to come to the surface.
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Author:
SwimRunPlumb (MI)
But, does the manufacturer of the pvc say that "no primer" is acceptable?
I always primer pvc.
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Author:
bernabeu (SC)
pvc is not cpvc
poly-vinyl-chloride is NOT THE SAME as chlorinated-poly-vinyl-chloride
pvc: [www.ppfahome.org] requires priming
cpvc: [www.ppfahome.org] priming optional:
Quote:CPVC piping and
fittings are joined with CPVC cements. The
solvent cement process can be a one- or a twostep
process. The one-step cement does not
require the use of a primer; the cement will be
yellow in color. The two-step process does
require the use of a primer; the cement will be
orange in color. Both types of cements are
manufactured under ASTM F 493 for use with
CPVC hot and cold water piping (½-inch to 2-
inch sizes) that conform with ASTM D 2846. The
label on the can will indicate the cement color
and whether a primer is required. Before using
one-step cement, check to determine if the local
code permits its use or if two-step cement with
primer is required.
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Measure twice, cut once.
Retired Plumbers Local Union #1
Edited 4 times.
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Author:
hj
Normally, it would be the manufacturer of the cement which would make a recommendation about primer or no primer. The PVC manufacturer would not care, because he only has to guarantee the material, NOT how it is connected.
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Author:
Paul48 (CT)
I'd err on the side of caution. What appears to be brand new, and nice and clean, could be contaminated with something that interferes with the integrity of the joint.Still no guarranties, but at least you made a valiant effort.
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Author:
bernabeu (SC)
re: cpvc ......
different (color coded) solvent/cements are used if primeing or not primeing
one step (no prime) cement is yellow
two step (primeing) is orange
re: pvc ......
MUST be primed first
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Measure twice, cut once.
Retired Plumbers Local Union #1
Edited 1 times.
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Author:
hj
quote; re: pvc ......
MUST be primed first
But, some "hot glues" say they do not NEED primer, although I still use it.
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Author:
LemonPlumber (FL)
Never!!! but leave an empty can of primer on job site?!Always do wipe excess glue from cpvc fittings maybe use a rag with primer on it to wipe.One step is a given .no code should weaken the joint or prevail over the use.If you do desire to appease the code enforcement, please do allow extra time and temp for the primer to completely dry before making the joint.
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Author:
hj
IF you NEVER prime the joints, where are you going to get the "empty primer cans" to leave on the jobs. Do you "garbage pick" the dumpsters of the contractors who DO prime their joints? Inspectors are not COMPLETELY incompetent. They can tell if the primer was swabbed on the pipe and fittings before assembly, or wiped on after wards.
Edited 1 times.
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Author:
SwimRunPlumb (MI)
Since you do primer pvc, I assume he would have empty primer cans even if he doesn't use it on cpvc.
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Author:
hj
I DO primer PVC, but we do NOT know if he does.
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Author:
LemonPlumber (FL)
HJ.as said no code can make me use primer.I select the tubing and stand on blue glue pvc /cpvc cement on my truck as the tubing and manufactures best to use at max cost.You may miss the best as used.the code may not.it must be placed used as spected.This post touched the source for the best and it has it.s own cpvc cement.never ever fail the best or fail with the rest.code is a lowly guide line.
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Author:
hj
quote; code is a lowly guide line.
I am guessing that you mean the code is a "minimum" standard. If so, and it requires primer, wouldn't you NOT using primer be doing LESS than the minimum? What is your reluctance to using primer in the first place? It only takes a few seconds longer, and you probably waste a lot more than that trying to make your responses as complicated as possible.
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Author:
bernabeu (SC)
primer is required for PVC
primer is dependant on type of 'glue' (solvent cement) used with CPVC
(cement will be color coded for w - w/o primer)
really easy to become confused
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Measure twice, cut once.
Retired Plumbers Local Union #1
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Author:
hj
My answers are on a philosophical basis, because I have only made a half dozen CPVC joints at the most, and I used primer on all of them.
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Author:
sidejob bob (FL)
never on cpvc and pvc water lines but on pvc waste . Union plumber does not have any exp on these plumbing maters .
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Author:
hj
quote; never on cpvc and pvc water lines but on pvc waste
Now if that is not the most "backwards" statement I have ever read or heard. The purpose for primer is to create a pressure tight joint. PVC water pipes need that, but waste lines are only under a small pressure during testing or backup. The rest of the time they could be leak proof without any primer OR glue. And WHY doesn't a "union plumber" have any experience in this matter? I and THEY do use PVC on our jobs. We also learn to do things the right way.
Edited 1 times.
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Author:
bernabeu (SC)
either:
a) sidejob is baiting us
OR
b) he defines the expression 'donkey's rear'
ps. i'm done here
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Measure twice, cut once.
Retired Plumbers Local Union #1
Edited 1 times.
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Author:
dlh (TX)
i use primer all the time. i can not tell you how many leaks i have fixed because only cement was used basically only glueing the pipe together. one slight bump after a couple years and it can leak. some cpvc cement says there is no need of primer but why risk it?
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PLUMBERS "Protecting The Health Of The Nation"
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Author:
bernabeu (SC)
imo: i always clean and prime, but:
Quote:re: cpvc ......
different (color coded) solvent/cements are used if primeing or not primeing
one step (no prime) cement is yellow
two step (primeing) is orange
- - - - - - -
Measure twice, cut once.
Retired Plumbers Local Union #1
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Author:
sidejob bob (FL)
well go prime or your 1/2and 3/4 cpvc pipe pvc residential waterlines . Wow you really want to bash me for that ? The guy ask a ? on the board and you act like your a plumbing god LOL . Hey dude I got opinion and you got yours but don't try to play plumbing god to me
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Author:
sidejob bob (FL)
o.k when I repair a water service that's junkie pvc I will first apply wet n shine then remove then reapply glue so it does get primed but not with primer . I do cpvc the same way
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Author:
hj
I REPAIR CPVC lines, I do not install them, so if you want to go primerless, be my guest. If they come apart I will put them back together with primer.
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Author:
bernabeu (SC)
ALL PVC requires primeing
CPVC depends on the 'cement' used:
Orange cement -> PRIME
Yellow cement -> NO PRIME
PVC IS NOT THE SAME PLASTIC AS CPVC
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Measure twice, cut once.
Retired Plumbers Local Union #1
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Author:
LemonPlumber (FL)
HJ.the manufacturer of the cpvc is very important.and this and only his point limits any code from being the best use.Where rain or shine is the only tubing pvc cement used you are dead wrong.???not me the manufacturer and of, tubing and cement?I am the higher limit !!!no code super seeds my use !!
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