Thickness of coupling in calculation
Thickness of coupling in calculation
(OP)
Ref. to this thread:
thread794-377365: Threaded Coupling
my question is: what thickness should I use in calculation of threaded coupling acc to b16.11? The equivalent as per table 7 or (Outside diameter of coupling - Outside diameter of threaded pipe)/2?
Because they are different. My A.I. said the last one. thanks
thread794-377365: Threaded Coupling
my question is: what thickness should I use in calculation of threaded coupling acc to b16.11? The equivalent as per table 7 or (Outside diameter of coupling - Outside diameter of threaded pipe)/2?
Because they are different. My A.I. said the last one. thanks





RE: Thickness of coupling in calculation
General Blr. CA,USA
RE: Thickness of coupling in calculation
So what is the meaning of table 7? When do you apply it?
RE: Thickness of coupling in calculation
Regards.
RE: Thickness of coupling in calculation
I read it, but for me it's not clear.
Table 7 expresses a correlation between Fitting class and schedule No. What does it change in my calculation?
Moreover, does UG-45 apply for B16.11 couplings? Should I consider corrosion allowance in calcs? I know that these couplings are usually exempted in calcs, but If I would consider them? thanks
RE: Thickness of coupling in calculation
Interpretation: Vlll-1-83-217
Subject: Section Vlll-1, UG-11 and UG-45
Date Issued: February 22, 1984
Question: Are threaded couplings welded directly to a pressure vessel to be designed per ANSI B16.11 as stated in UG-11, footnote 5, Section VIII, Division 1, thus disregarding the requirements of UG-45 for nozzle neck thicknesses, since no neck exists?
Reply: Yes.
Is this still valid?
RE: Thickness of coupling in calculation
“Should I consider corrosion allowance in calcs?"
Mmmmm!!!!!!! . Please read ASME VIII Div 1 from page 1 to the end of Code up to the time to be clear for you.
Search "corrosion" and you can find 226 instances.
Regards
r6155
RE: Thickness of coupling in calculation
I was referring to B16.11! I'm not so noob...
RE: Thickness of coupling in calculation
Regards
r6155
RE: Thickness of coupling in calculation
Then you shall deduct the pipe mill tolerance, 12.5%
Then you shall deduct the applicable thread height.
Then you shall deduct the corrosion allowance.
Use the appropiate equation from ASME VIII-1. For couplings I normally use App. 1 equations for cylinders, using the allowable stress of coupling material.
As for the VIII-1-83-217 interpretation, I'm not sure if it is still valid. It would be good if you can search further and share you findings.
Hope this helps.
RE: Thickness of coupling in calculation
In table 7 for your example 0,75” threaded coupling class 3000 is pipe sch 160 , then in Table 1-4 thickness is 0,25”
(0,219” is after -12,5% pipe tolerance).
Regards
r6155
RE: Thickness of coupling in calculation
You still may have to supply calculations specially for welding sizing and reinforcing,
General Blr. CA,USA
RE: Thickness of coupling in calculation
Thanks GenB, but where do you exactly find this statement in ASME code? Is it clearly written that c.a. e w.u. need not to be considered?
RE: Thickness of coupling in calculation
General Blr. CA,USA
RE: Thickness of coupling in calculation
I know it, but for A 350 LF2 threaded coupling B16.11?
RE: Thickness of coupling in calculation
General Blr. CA,USA
RE: Thickness of coupling in calculation
Please answer me to this question: I have this A 350 LF2 threaded coupling B16.11. Do I have to consider corrosion allowance and wall undertolerance? If yes, where is it written in B16.11? Beacause I can't find any reference.
RE: Thickness of coupling in calculation
Similar to plate Specs.
General Blr. CA,USA