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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

    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...
  3. iTools

    Revision clouds in CATIA Drawing

    Can anyone tell me how to make a revison cloud on a drawing made in CATIA? Regards, iTools
  4. 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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