We’ve seen our first pieces of Sch. 10 fail from MIC recently, but that’s a
different ballgame and NONE of the parent steel alloys factor that in their CRR
ratings. I’d like offer another angle if I may, because this thread has been
in the context of contractor and product practices only so
Only that the owner is worried about pipe failures using schedule 10. I don’t
know where is information is coming from. In my 34 years in this industry I
have never heard or seen Schedule 10 pipe failures on water filled sprinkler
systems unless they freeze. The only other scenario is the use
For information purposes only, I have done many projects whose
specifications require schedule 40 black steel pipe for all systems.
Threaded or grooved ends are allowed. For dry pipe or preaction systems,
roll grooves are not allowed; only cut grooves.
I have great success with this approach.
Did the specifying engineer state why he/she wants only Sch 40?
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> On Nov 22, 2022 at 12:14 PM, (mailto:sbi...@wenteplumbing.com)> wrote:
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> I always use the Corrosion Resistance Ratio (CRR) argument.Basically, the
> thickness of
I always use the Corrosion Resistance Ratio (CRR) argument. Basically, the
thickness of schedule 10 piping is greater than or equal to the thickness
of the first exposed thread of threaded schedule 40. Using this argument,
schedule 10 should theoretically last at least as long as threaded
Go to the engineered corrosion solutions page, they have several studies on
corrosion of pipe, much better to install a nitrogen system with sch 10
then to install sch 40 pipe. The biggest problem with sch 40 is that it
still corrodes but instead of failing the pipe just ends up full of
corrosion
The only info that comes to mind is the comparison of thicknesses. If they are
the same material, same coating, same environment - as I understand it, the
rate of corrosion is linear through the 'meat' of the pipe. I believe that is
the basis for the corrosion resistance ratio concept. The old
Are there any studies comparing the failure rates of Schedule 10 steel pipe
versus schedule 40 steel pipe used on wet water filled sprinkler systems?
I have a client who is not allowing the use of schedule 10 Main piping 2 ½
and larger on their projects. All piping used has to be schedule 40.
