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Figure 5-6 S-N nozzle note

Figure 5-6 S-N nozzle note

Figure 5-6 S-N nozzle note

(OP)
This question is regarding weld spacing to an S-N nozzle.

  The S-N note is: "Non-Reinforced Opening (manhole or nozzle inserted into the shell per the alternate neck detail of Figure 5-7B).  

  I guess I'm confused (not an unusal event).  

  The note says "non-reinforced" but then refers to a weld detail which shows reinforcing: (T+t) thickened shell plate.  

  What does API mean by "non-reinforced" in this particular case?

RE: Figure 5-6 S-N nozzle note

API has some really bad wording here.  Just because a nozzle doesn't have a separate repad does not mean it is not reinforced.  The "non-reinforced" wording is not helpful.

Joe Tank

RE: Figure 5-6 S-N nozzle note

(OP)
I mean no disrespect but do you have any history, documentation or backup for this interpretation?  IE that for this S-N note where API says "non-reinforced" they mean "has no separate reinforcing plate"?  Has API answered this question before?

RE: Figure 5-6 S-N nozzle note

IFRs,
Sorry.  I have no specific backup other than common usage within the inductry.  But, I believe that the S-N note has been changed or modified within last five years or so to the current wording.

Joe Tank

RE: Figure 5-6 S-N nozzle note

(OP)
Update:

API has addressed this issue and a ballot item was approved for publication in a yet to be published Addendum #1 of API 650 11th edition.  The new wording of the S-N note reflects the intent of "S-N" to mean self-reinforced or reinforced without a separate re-pad, inlcuding small nozzles and couplings that do not need a re-pad and manways or nozzles installed in a thickened insert plate.

RE: Figure 5-6 S-N nozzle note

IFRs,
Thanks for the update.  Does that mean I wasn't wrong?
Joe

Joe Tank

RE: Figure 5-6 S-N nozzle note

(OP)
Joe -
You are seldom if ever wrong.  In this case, your virtue is intact.

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