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Posted by CR on October 9, 2005, 2:26 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
The primer that I always use is blue, possibly the pro that installed yours
thought it was glue? My house had a system installed before I bought it. One
of the joints going to the backflow failed when the guy that tested it for
me dug up the box around the backflow valve and put pressure on the pipe
when he put the box back in the ground. When I dug it up it had no glue,
just the blue primer.
CR
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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