Reducer Coupling - Dimensional Standard Help

[UW1981]

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?

 

[JLSeagull]

The standard that you need is ASME B16.9.

 

[UW1981]

Well....I thought of that. First, 16.9 deals with welded fittings and the fitting in questions is threaded. Second, all reducers in 16.9 have a "shoulder" on them...this fitting has no shoulder. It appears to simply be a threaded cap, with a hole cut/tapped in the top. I have also checked MSS SP-95 which deals with swages...again, this does not a swage (male-large end, male-small end), this fitting is a female-large end, female-small end).

 

[deanc]

Is the material acceptable? Check marking/MTR.

Use it a "fab" part and do calcs. per the Code of construction.

 

[UW1981]

deanc, thanx for the response.

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.