Why equal diameter tees are forbidden in the creep range according to EN standards?
Why equal diameter tees are forbidden in the creep range according to EN standards?
(OP)
Hi All,
One month ago I put similar question on Boiler and Pressure Vessel forum with no result. Maybe here someone knows.
Some European piping and boiler standards set limit on the ratio of branch to shell inner diameter. This Limit d/D ≤ 0.8 (for extruded outlets 0.7) could be found in EN 13480, EN 12952 and German Boiler Standard TRD 301. ASME standards (B31.1, B31.3, Section I) do not have such limitation.
My questions are:
- what is rationale for that limitation.
- where it originated from (research paper, monograph, book, etc)
- is it pertinent only to pressure-area method of reinforcement calculation
Regards
Patafian
One month ago I put similar question on Boiler and Pressure Vessel forum with no result. Maybe here someone knows.
Some European piping and boiler standards set limit on the ratio of branch to shell inner diameter. This Limit d/D ≤ 0.8 (for extruded outlets 0.7) could be found in EN 13480, EN 12952 and German Boiler Standard TRD 301. ASME standards (B31.1, B31.3, Section I) do not have such limitation.
My questions are:
- what is rationale for that limitation.
- where it originated from (research paper, monograph, book, etc)
- is it pertinent only to pressure-area method of reinforcement calculation
Regards
Patafian





RE: Why equal diameter tees are forbidden in the creep range according to EN standards?
RE: Why equal diameter tees are forbidden in the creep range according to EN standards?
Technology is stealing American jobs. Stop H1-Bs for robots.
RE: Why equal diameter tees are forbidden in the creep range according to EN standards?
So European standards tell us that equal diameter tee is unacceptable when creep governs material behavior. One could draw conclusion that equal diameter tee in creep is too dangerous, but American standards ASME B31.1, B31.3 or Section I do not recognize that. It is a little bit strange for me.
RE: Why equal diameter tees are forbidden in the creep range according to EN standards?
Technology is stealing American jobs. Stop H1-Bs for robots.