The reasoning for Appendix 2-2(d)(1) I believe is more on avoiding opening up the laminations as a result of plate manufacturing (this is discussed in ASME BPVC Companion Guide). It is not really about the grain direction (metallic grain structure) as it is kind of scattered and random...
Some specifications can still allow thermal cutting for Q&T material if you apply preheating during cutting operation and you perform subsequent heat treatment.
Elliptical ≠ Ellipsoidal
Also, the interpretation you quoted acknowledges there is a knuckle on an ellipsoidal head.
You haven't answered where it is required to measure actual strains even.
In addition, if you're dishing and spinning a head, you'll need to have a crown radius and a knuckle...
I agree, the formula should be based on the radius of the curve of the head, not the before and after diameters of the plate. I checked with Compress and they still use the 3rd formula in Table 6.1. instead of the first one which is the same as UG-79.
The extreme fiber elongation limit will...
You should mention where exactly strain measurement is required and how do you measure the strain. I have reviewed hundreds of inspection and tests plans of fabricators and strains are not measured directly. Only the shape, radius, and thickness are measured after forming. The strain is...
Are you consistently operating at 850°C or just occasionally? You can still operate some materials at that temperature if just in short durations but will have to consider creep damage. Or you can just apply a refractory lining to isolate the metal to the high temperatures which is what is...
The radius you use in the formula in Table UG-79-1 or Table 6.1 for an ellipsoidal head is the mean radius of the knuckle (Rf), not the radius of the head measured in the straight flange or cylindrical part (Dm/2). The radius you use in the formula for a spherical head would be the mean radius...
Both NACE MR0103 Sec. 16.2 and NACE MR0175 Part A.2.2.4 specifically require it only for "exposed to sour service" bolting which are "denied direct atmospheric exposure". If your specs refer to NACE, then you can take that exception if the flange bolting is not insulated. Client specs like Shell...
Is your flange insulated? Cold service? Is it high severity wet H2S service? Maybe you still can use Gr. B7 if it is an external bolting with unrestricted air circulation.
Some Owners will still require basic requirements on the base metal (e.g. Max CE/C/S/V+Nb, UT Lamination Check, Normalized Condition, Hardness Limits per NACE MR0175, etc.) even with weld overlay or cladding applied. But other requirements such as PWHT, WFMT, HIC Testing, etc. can be excluded...
You have no information on my background and experience. Better be professional on this forum.
I helped by disputing your claim that you failed to justify technically. No one uses vernier calipers during fabrication and on-site for flanges. We've used UT measurements alongside hydraulic...
Who uses vernier caliper to measure elongation of the bolt? Ultrasonic measurement is typically used, but for large bolting only.
No, testing is not more demanding during manufacturing compared to the Site. They are both subjected to the same requirements.
No, only target stress or torque...
