BigInch I agree with you that stress pattern changes with branch to header ratio and when the ratio approaches 1 it is most unfavourable. But this is true for material working in creep range and below as well.
So European standards tell us that equal diameter tee is unacceptable when creep...
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...
Hi
You can refer to European Boiler standard EN 12952-3. You can find there so called temperature allowances. They set different temperature allowance for different boiler component and
heating mechanism. For example for tubes with superheated steam heated mainly by radiation temperature...
Hello Everyone,
There is very important difference between European and American approach to reinforcement calculation of openings working in creep range. Some European standards limit ratio of branch to shell inner diameter d/D ≤ 0.8. This nonexistent in American standards limitation could be...
Thanks for for info.
I have no access to AASHTO Specifications.
IRstuff
Engineering ToolBox lists strange coefficients.
For example steel on steel - 0.8
Also here http://hypertextbook.com/facts/2005/steel.shtml
I can't find familiar value of 0.3.
Am I in a parallel Universe???
Recently I came across a couple of pipe stress calculations with very low friction coefficient used for SS on PTFE pad.
Those coefficients varied from 0.05 to even 0.01. I started to look what teflon sliding pads vendors reccomend in their specifications.
I found one German producer who gives...
XL83NL
I do not know Becht's paper.
My approach is based on European standard for piping EN 13480 which says:
This in my opinion literally excludes girth welds.
Considering bolts. Is there any chance to assume the lower temperature for bolts?
I expect that whole flange joint is insulated...
Regarding WSRF
I think that you may need not use any weld strength reduction factor.
As the piping is intended for short operation max. one year you are below 10 000h.
If do not assume continuous operation you may come to 5000h or even less.
On the other hand if your stresses are not to close...
