Reducer Coupling - Dimensional Standard Help
Reducer Coupling - Dimensional Standard Help
(OP)
I recently ran across a threaded fitting for which I cannot find a specific ASME standard relative to the dimensional tolerances....and would like to see if any of y'all could provide some guidance.
The fitting is a "reducing coupling", this specific fitting is 2" to 1". Basically, it is a 2" threaded cap, with a 1" threaded hole cut in the top of the cap. ASME B16.11 provides dimensions for a cap...and for a coupling...but I could not find anything in 16.11 that addresses this specific type of fitting.
I guess if the wall thickness (dimension G - which is the cap wall thickness from 16.11) of this fitting is 0.5" as indicated for 3000# fitting in 16.11, the fitting is OK....but since 16.11 does not specifically address the issue of cutitng a hole in the cap, I guess I am not sure.
Any thoughts or advice as to whether this is an ASME approved fitting?
The fitting is a "reducing coupling", this specific fitting is 2" to 1". Basically, it is a 2" threaded cap, with a 1" threaded hole cut in the top of the cap. ASME B16.11 provides dimensions for a cap...and for a coupling...but I could not find anything in 16.11 that addresses this specific type of fitting.
I guess if the wall thickness (dimension G - which is the cap wall thickness from 16.11) of this fitting is 0.5" as indicated for 3000# fitting in 16.11, the fitting is OK....but since 16.11 does not specifically address the issue of cutitng a hole in the cap, I guess I am not sure.
Any thoughts or advice as to whether this is an ASME approved fitting?





RE: Reducer Coupling - Dimensional Standard Help
RE: Reducer Coupling - Dimensional Standard Help
RE: Reducer Coupling - Dimensional Standard Help
Use it a "fab" part and do calcs. per the Code of construction.
RE: Reducer Coupling - Dimensional Standard Help
I believe the material is OK (still checking, but I believe this is a Bonney Forge fitting, and their's are made of A105).
As a last resort, I could do the calcs...but was hoping for an ASME spec for this type of fitting. I have had a brief conversation with Bonney Forge and they state it complies with B16.11, but I may need to press them for their engineering calcs for this fitting (beats me having to do it!). Their drawings show it to be constructed just like a coupling as outlined in 16.11, only with one end smaller than the other.