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You are correct. There was a special meeting in Dallas on May 7th where the issue was discussed. The push-back ASME got after publishing the interpretation didn't come from any owner-operators of the equipment. ASME Committee correspondence states that, “ASME received several letters from [3]...

Upstream oil and gas producers frequently utilize pieces of equipment known as heater treaters (API 12L emulsion treaters) which are vessels that contain liquids produced from wellheads. Heat is introduced to the liquids through the use of a natural gas or hydrocarbon liquid burner that is...

Fun fact...to the best that I've researched, the respective D2 fabrication tolerances are the same as those in D1, ironically.

MrPDes & TGS4, thanks for taking the time to entertain my question and reinforce what I’ve picked up on recently about 1-10, D2, and the 2017 Edition. I’ve recently gotten back into the pressure vessel design scene after being pretty much hands-off over the period 1-9 and 1-10 evolved into...

For Division 1 Appendix 1-10 nozzle designs, does the use of Division 2 Part 4.5.14 to satisfy the U-2(g) weld strength requirements (in lieu of UG-41) trigger Code Case 2695, specifically its fabrication tolerance and Manufacturer’s Data Report requirements? I understand that the D1 1-10...

F.2.3 Step #3 versus Table F-1...huh? Am I missing something or are they poorly written? I get the 5 times corrosion rate calculated minimum thickness that are cited in the step 3 narrative and the table but I get derailed with the bottom critical annulus (Tb1) and both shell elements (Ts1 &...

Why not drill one big hole indeed. Their strategy is to avoid reinforcement by using two small holes that the Code doesn't require to be reinforced. A larger hole would start to resemble a real nozzle and kick in all the requirements thereof. I haven't found a Code basis for evaluating the...

I’ve been asked to review the design of a 500 psig MAWP separator having a NPS 12 liquid “sump” that is set on (abutted to) the exterior surface of the main, horizontal, 30” diameter shell. Liquids are communicated to the sump through two 2” diameter holes that are drilled through the main...

The same implications as in earlier editions...the dependency is there even though the new format doesn't necessarily make it as obvious as the earlier, nested format. Thanks for confirming what I'd hoped is the case.

Steve, The wording has been in B31.8 for some time so you must be referring to how that wording is now structured insofar as ASME joining the world of other pipeline codes. So in the context of how the Code is now written, not necessarily the mechanics of fracture theory, you are of the...

Prior to the 2010 edition, in at least the 2003 and 2007 editions, the Brittle Fracture Control and Ductile Fracture Arrest paragraphs were nested in/under paragraph (c) which implies their applicability only when the Fracture Toughness Criterion is triggered. Interpretation 15-5 would seem to...

Fortunately for my applications, formed heads, using the lower allowable stress values don’t force me to go with a thicker material. We don’t play with stainless much so I’m sure our QC department would freak out if they had Code calculation reports listing the head material as “SA-240 Gr...

Gotcha metengr. I'd previously read each of the notes but obviously didn't take G5 to heart. Having gone through it again (more slowly) I get the subtlety now. It's that 'they' chose to do it that way. Thanks.

ASME Section II, Part D, page 82…the materials listed in lines 38 and 39 are both identified as SA-240 304L plate with the same P-No., Group No., min. tensile and yield strengths, and external pressure chart no. Their applicability and max. temp. limits (page 83) are the same except for the...

Thanks all. I appreciate the shared knowledge and experience.

CodeJackal, I get the x2 multiplier now that you reiterated the “equivalent longitudinal efficiency” term. It relates to the (now) footnote 16 on page 19, “…circumferential joint efficiency is less than one-half the longitudinal joint efficiency…” All I can say is that’s one way to look at...

$hit happens...no blood, no foul.

I’m disappointed vesselfab. I had picked up my Pressure Vessel Handbook and it offers the following for a 2:1 ellipsoidal head in terms of outside dimensions t= PD 2SE+1.8P That equation is the same as what's derived from Appendix 1, 1-4(c) and IS NOT the first equation, as you...

vesselfab, thanks for the reference material. Still, the predominant topic in the examples (pages 3-5) involved efficiencies of seamless shell sections and seamless heads…not the welds joining them. The governing equations for thickness determination are UG-27(c)(1) for (circumferential...

Example L-1.6 in Appendix L (page 551) cites an equation for a 2:1 ellipsoidal head. t= PD 2SE+0.4P Is that equation correct? I only ask because I have not found it elsewhere in the Code. The equation resembles UG-32(d) t= PD 2SE-0.2P and UG-27(c)(2) applicable...