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The change from uts/4 to uts/3.5 was made to make asme viii-1 more in line with European codes. Due to uts/4 requirement asme vessels were much thicker than comparable European ones.

Indeed not a bit uncommon for a boiler. I would suggest to weld P22 studs to the P22 header and than weld the 347H tubes to the P22 studs using ERNiCr-3 filler.

For plates per ASTM A 240 the tolerances on wall thickness are found in ASTM A 480 table A2.17 ( or A3.17 if Si units are required). Tolerance depends on thickness {table goes up to 254 mm) and plate width.

For plates in stainless steel see ASTM A-240 for CS/LA see ASTM A-20

If you work per AD 2000 you have to use materials approved per AD 2000. So in your case if you have to use a SS type 304L than go to AD 2000 par. W2 and select the required material from the list of approved standards. In case of a plate this would mean that you have to use material per (DIN)...

For pressure equipment that have to comply with PED and are fabricated from ASTM carbon steel materials like A 106 B, a 234 WPB, A 105, it is quit normal to order these materials with a limit on the Carbon content (0.23% max) and to mention this also on your PMA.

A butt joint is a joint between members that are in line with each other (eg a pipe to a pipe) and a T joint is for instance a branch weld (e.g nozzle on a vessel) The text you refer to could mean that if you are qualified to weld a butt joint you are not qualified to de a branch weld and visa...

CL2 is not allowed to be used in ASME 1 or ASME VIII. ASME B31.3 however does allow CL2 , so you can find the allowable stress at temperature in the B31.3 stress table.

Since failure of lugs during lifting could lead to serious safety issues I would advise the following: Use lug material with impact test 27J at minus 20 or lower to assure that you have a shock resistant material. Perform UT testing on laminations at the area where you are going to weld the...

Sorry, I ment Appendix 1, of ASME IID

DIN 2559 specifies the type of weld bevel preparations, like ASME B16.25. Form 22 is for thickness below 16mm and specifies an angle of 30 Degrees.

See ASME IID appendix 10. Here you will find the basis of the allowable stress determination

ASME published a document about this topic. Pls google on ASME solar Code gap

Depending on the design pressure and the volume ( or pipe diameter in case of piping) and the medium inside the pipe the PED will show you which category you are in. With this category you have to select a module. The selected module tells you if design and/ or fabrication approval by a NoBo is...

Use API 530 Larson Miller curve for Carbon steel to calculate the estimated life time

You could do a 1000hrs creep test on a welded joint as allowed by ASME B31.3 par. 302.3.5 (f)(1)to get a higher factor than .77

The formula used by the eng. office is the same as mentioned under B31.3 par 304.1.2. Because they prabably use metric system the pressure is in Bar and the allowable stress in N/mm2 (same as MPa) so they need to devide the pressure by 10 to get N/mm2

metengr , Thanks for your reaction. The requirements are claer , but I do not see the difference between the text in the Code and the text in the Code case. In the latest index of Code Cases suppl. 10 based on last ASME commity meeting of May 2012, CC2626 is still valid. Where did you find that...

Code case 2626 (in short) states that the calculation of the required by thickness UG-16(b)(5(d) (which referes to UG-27 calculation method) may be waived provided that : the minimum thickness shall not be less than calculated per UG-27? Looks like i am in a loop here. Can anyone clarify?

You could determine the FATT 50/50 by doing impact tests at different low temperatures untill your impact testpieces show about 50 ductile appearnce . Note that X20CrMoV11-1 is actualy a material for high temperature , so why would you be interested in its low temperature behavior. Secondly...