Do you Know anyone the Uni EN 13480- part three?

[Airman23]

Dear Sirs,
is there in this forum anyone that know This Uni EN?
If there is, you will want know the meaning of the term "k" presented in the page 209; in particular, I want know the meaning of the term "B" because in agreement of this I obtain the term "k".
Many thanks in advance.


Eng. Antonino Nicosia
Aeronautical Engineer specialized in Fluid Power field.

my website: web.tiscali.it/aeronavigandosulweb
(in the future there will be many programs about fluid power problems, thermal and structural problems)

 

[grandnobi]

Airman23

Probably it would be helpful to quote the Section No. or Equation No. you are having trouble with. My german version of EN 13480-3 does not mention term "k" on its page 209, although contents generally should be equal.

 

[Airman23]

Dear grandnobi,
but are you an hero of most famous "Stars wars"?
However, thanks for your answer; I tell you that my doubt is contained in the paragraph D.5.4.2 of the Annex D (EN 13480-3). This paragraph says:
<<The assembly condition and operating condition are both normal design conditions for the purpose of determining nominal design stresses...fh shall be the nominal design stress of the shell except for welding neck or slip-on hubbed construction where it is the nominal design stress of the flange.
If B=1000 mm then k=1,0
If B=2000 mm then k=1,333
...>>
Now, I don't understand how I can compute this "B" and what is the meaning of "B" and then of "k", can you help me?
Thanks in advance.


Eng. Antonino Nicosia
Aeronautical Engineer specialized in Fluid Power field.

my website: web.tiscali.it/aeronavigandosulweb
(in the future there will be many programs about fluid power problems, thermal and structural problems)

 

[Airman23]

Annex D gives requirements for the design of circular bolted flange connections.

Eng. Antonino Nicosia
Aeronautical Engineer specialized in Fluid Power field.

my website: web.tiscali.it/aeronavigandosulweb
(in the future there will be many programs about fluid power problems, thermal and structural problems)

 

[grandnobi]

Airman23,

According to the glossary of Appendix D (see section D.3 of EN 13480-3) "B" represents the inner diameter of the flange. This interpretation fits both to the illustrations in Appendix D and also to the unit given (i.e. mm).

"k" appears to be an empirical factor to consider the flange diameter when applying formulas D.5-39 thru D.5-43.

Thus - depending on the specific task - "B" normally should not be a value to be computed, but a choice to be made by the designer, which later has to be verified by the evaluation of stresses.

However, I have no explanation why the value of "B" is limited to the range between 1000mm and 2000mm. I would have expected EN 13480-3 to give some indication on how to proceed in case "B" exceeds 2000mm, or is less than 1000mm respectively.

Regards,
grandnobi

P.S. "grandnobi" has Hip-Hop-roots rather than StarTrek-roots *g*.

 

[Airman23]

O.k.
if B represents the inner diameter of the flange, as I supposed but I don't believe this, in the normal use are there flanges with inner diameter of 1000 mm or 2000 mm or flanges with inner diameter exceeds 2000 mm?
Thanks

P.S.:
So I have, in my piping system, two flanges with inner diameter less 1000 mm, what's the value for "k"?

Eng. Antonino Nicosia
Aeronautical Engineer specialized in Fluid Power field.

my website: web.tiscali.it/aeronavigandosulweb
(in the future there will be many programs about fluid power problems, thermal and structural problems)