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Posted by MG on October 8, 2005, 8:55 pm
A month ago I found a leak in the sprinkler.
No problem, you dig, splice and repair.
Apply the pressure and another elbow nearby blows open.
At this point I get a little suspicious and stress mildly all other joints
in the dig and got 2 more to fail nice an clean, you can tell that there was
no good bonding.
Also note that the cement used was a deep blue, not the usual transparent
stuff with the tell tale of the purple primer.
The blue cement appears to be like a thick paint, the failed joints can be
easily cleaned with steel wool and the cement residue does not seem to be
fused with the rest of the fitting as I would expect.
Same story, I stressed the stub and I got the entire valve assembly out. I
was able to break out the pipe stubs from the valve. All pretty poor joint,
little sign of cement.
Other notes. The water utility started adding free chlorine for the annual
flushing, this is a temporary thing. Could this be a factor?
I never had any problem with the transparent type of cement applied over the
purple primer.
Is this blue cement different? Incompatible with PVC?
I do not believe movement or stresses are a factor here.
Anyone can shed some insight?
Thanks MG
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Posted by George on October 8, 2005, 5:35 pm
MG wrote:
> A month ago I found a leak in the sprinkler.
> No problem, you dig, splice and repair.
> Apply the pressure and another elbow nearby blows open.
> At this point I get a little suspicious and stress mildly all other joints
> in the dig and got 2 more to fail nice an clean, you can tell that there was
> no good bonding.
>
> Also note that the cement used was a deep blue, not the usual transparent
> stuff with the tell tale of the purple primer.
>
> The blue cement appears to be like a thick paint, the failed joints can be
> easily cleaned with steel wool and the cement residue does not seem to be
> fused with the rest of the fitting as I would expect.
>
> Same story, I stressed the stub and I got the entire valve assembly out. I
> was able to break out the pipe stubs from the valve. All pretty poor joint,
> little sign of cement.
>
> Other notes. The water utility started adding free chlorine for the annual
> flushing, this is a temporary thing. Could this be a factor?
>
> I never had any problem with the transparent type of cement applied over the
> purple primer.
>
> Is this blue cement different? Incompatible with PVC?
>
> I do not believe movement or stresses are a factor here.
>
> Anyone can shed some insight?
>
> Thanks MG
>
>
You pretty much described the problem. Whatever the blue cement was it
is clearly not compatible with the plastic pipe because it never
dissolved the plastic (what a solvent cement does) to form a bond.
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Posted by Sacramento Dave on October 8, 2005, 9:50 pm
> A month ago I found a leak in the sprinkler.
> No problem, you dig, splice and repair.
> Apply the pressure and another elbow nearby blows open.
> At this point I get a little suspicious and stress mildly all other joints
> in the dig and got 2 more to fail nice an clean, you can tell that there
was
> no good bonding.
> Also note that the cement used was a deep blue, not the usual transparent
> stuff with the tell tale of the purple primer.
> The blue cement appears to be like a thick paint, the failed joints can be
> easily cleaned with steel wool and the cement residue does not seem to be
> fused with the rest of the fitting as I would expect.
> Same story, I stressed the stub and I got the entire valve assembly out. I
> was able to break out the pipe stubs from the valve. All pretty poor
joint,
> little sign of cement.
> Other notes. The water utility started adding free chlorine for the
annual
> flushing, this is a temporary thing. Could this be a factor?
> I never had any problem with the transparent type of cement applied over
the
> purple primer.
> Is this blue cement different? Incompatible with PVC?
> I do not believe movement or stresses are a factor here.
> Anyone can shed some insight?
> Thanks MG
> I believe the blue glue is for wet situations. It sounds like whoever did
the install did not use primer or let it sit to long primed without gluing.
A common practice is to prime a bunch of fittings and grab as you need
them.The primer softens the pipe so the glue holds better if you let it sit
to long the primer dose no good. Some people think you don't even have to
primer the pipe, see how long that holds.
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Posted by BobK207 on October 8, 2005, 4:14 pm
The BEST joints (strongest, longestest lasting, problem free) are made
with primer followed by light bodied clear cement.
In 35 years of experience I've never had a joint problem using primer
followed by clear cement. Prime just prior to cement.
The only joint failures I've had was when I switched to blue (Red Hot)
cement. I thought it would be better since all the "pros" use it.
It's just faster not better. I was wrong, I'll never use or suggest
the use of the blue stuff.
cheers
Bob
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Posted by Stretch on October 8, 2005, 4:54 pm
Sounds like they did not use primer. I see it all the time.
Stretch
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> No problem, you dig, splice and repair.
> Apply the pressure and another elbow nearby blows open.
> At this point I get a little suspicious and stress mildly all other joints
> in the dig and got 2 more to fail nice an clean, you can tell that there was
> no good bonding.
>
> Also note that the cement used was a deep blue, not the usual transparent
> stuff with the tell tale of the purple primer.
>
> The blue cement appears to be like a thick paint, the failed joints can be
> easily cleaned with steel wool and the cement residue does not seem to be
> fused with the rest of the fitting as I would expect.
>
> Same story, I stressed the stub and I got the entire valve assembly out. I
> was able to break out the pipe stubs from the valve. All pretty poor joint,
> little sign of cement.
>
> Other notes. The water utility started adding free chlorine for the annual
> flushing, this is a temporary thing. Could this be a factor?
>
> I never had any problem with the transparent type of cement applied over the
> purple primer.
>
> Is this blue cement different? Incompatible with PVC?
>
> I do not believe movement or stresses are a factor here.
>
> Anyone can shed some insight?
>
> Thanks MG
>
>