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  1. iTools

    Factors in NC-3658.3

    I need to do some verification of flanges according to NC-3658.3 but I am a bit confused about the constants used in the expressions. Now, the ASME-III, Division 1, section NC states the following in eq. (12): Mfx < 21437.5 *(Sy/246960)*C*Ab (SI version) Could anyone tell me what this...
  2. iTools

    Article on calculation on friction factor

    Dear all, thank you all for you replies. I eventually got the article from Danish Technical University here in Copenhagen.
  3. iTools

    Article on calculation on friction factor

    To 'katmar': I allready have the formulas, but my scientific background tells me to read an article before I refer to it in calculations, reports etc. in case someone starts asking questions. To MortenA: I have mailed to DTU asking them for a copy of the article.
  4. iTools

    Article on calculation on friction factor

    On several occasions I have come across a reference to an article written by S.W. Churchill regarding calculation of friction factors. I have the complete reference here: Churchill, S.W. Friction-factor equation spans all fluid flow regimes. Chem. Eng. (New York) 84 (24), pp. 91–92. 1977. I...
  5. iTools

    Revision clouds in CATIA Drawing

    Thank you, Azrael, for your explanation. You are right about the need to be able to scale and stretch the ditto so even though your description sounds reasonable it does not quite fulfíll my needs. To everybody: We experimented with using a spline and a newly created linetype consisting of...
  6. iTools

    Revision clouds in CATIA Drawing

    There is apparently a lot of ways to indicate alterations on drawings. Users of AutoCad must know the revision since it has been a part of the drawing tools here for some years. To Azrael: Now, you must explain to me what 'a ditto' is. I have considered to make a linetype made of...
  7. iTools

    Revision clouds in CATIA Drawing

    Hi jackk A revision cloud is used on drawings to show the alterations that have been made since last issue of the drawing. It looks like a cloud, actually. See the attached sketch. It shows that a dimension has been...
  8. iTools

    Revision clouds in CATIA Drawing

    Can anyone tell me how to make a revison cloud on a drawing made in CATIA? Regards, iTools
  9. iTools

    EN 13445 (A weird clause for Lifting lugs)

    Recently I have started working with EN 13445 for the design of pressure vessels and I have come across a clause in the section regarding lifting lugs, sec 16.7.3, which I do not quite understand. The clause is: 0.001 < en/Deq < 0.05, where en is nominal thickness and Deq in my case is the...

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