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Recent content by adamuk

  1. adamuk

    NFE 32-101, 102, 103 French Boiler Code: have a copy or know about it?

    Hi, I looked into EN12952 but it doesn't specify that it supersedes NF E 32-101, etc . Thanks to the boys at IHS I've managed to locate a copy and it'll be here next week! Many thanks for your comments. Adam. Adam Potter MEng CEng MIMechE www.ax-ea.co.uk
  2. adamuk

    NFE 32-101, 102, 103 French Boiler Code: have a copy or know about it?

    We have a boiler designed to a french boiler code: Code de construction des générateurs de vapeur We're particularly interested in part 103: NFE 32-103 Code de construction des générateurs de vapeur - Partie 3 : Calcul de résistance des éléments soumis à une pression intérieure as this is...
  3. adamuk

    Metal to metal flanges

    Good luck getting a seal. Slight variations in surface profile will require a high bolt load to seal up and this should form the basis for your calculations. Pressure sealing metal to metal joints usually use a softer metal ring with a small contact area so you don't need a massive contact...
  4. adamuk

    Requirement to pressure test process vessels during service life?

    Yes, overpressurising a component containing a crack can blunt the crack tip and provide a small zone of compression at that region thus retarding further growth. The pressure required to do this would depend on crack location and geometry. The PED primarily regards placing equipment onto...
  5. adamuk

    Requirement to pressure test process vessels during service life?

    I remember reading some work carried out by the British Gas research bods in Newcastle UK about 15 years ago. They were looking at the effects of hydrotesting underground piping with small, deep pits. One of the results was that piping undergoing hydrotesting failed at a subsequently lower...
  6. adamuk

    Ammonia MAWP Requirements

    The design pressure of vessels containing cryogenic or liquified gases will be based upon the vapour pressure at the maximum expected in service temperature. You would reach 265psig at at somewhere between 40 and 45degC. That's the "why" Adam Potter MEng CEng MIMechE www.ax-ea.co.uk
  7. adamuk

    API510 vs API570

    I'd go for API510 myself. There's quite a bit of overlap between the two when it comes to the exams. Adam Potter MEng CEng MIMechE www.ax-ea.co.uk
  8. adamuk

    stop leaking at methanol tank

    Before you go about killing someone ask yourself some questions: (1) Are you sure this is the only crack in your tank? (2) Is the length actually the total length? There may be a very large crack of which only a small part has become through wall. (3) Is the crack at such a length that...
  9. adamuk

    Internal Design Pressure Affecting Overturning Moment

    Flat, thin plates generate high membrane stresses under pressure which will cause them to deform as IFRs states, the net effect of this is that the edge of the plate will be raised upward. Adam Potter MEng CEng MIMechE www.ax-ea.co.uk
  10. adamuk

    Tank Earthing

    I think your 'consultant' should do gen up on some basic electics first. Any earth will be held at 'ground' potential which is 0 Volts so any charge developing anywhere near a conductor that was earthed would immediately cause a current to flow and the voltage to drop. Vessels and tanks are...
  11. adamuk

    What Code would 3 psi Chorine Tank fall under?

    So is this chlorine dissolved in water (aka hydrochloric acid)?? Rubber-lined/brick lined kit's often used in processing strong aqueous acids. Surely the designer would specify the code so I would ask him. If you get a blank stare then I would dig a bit deeper but API-620 or 650's probably a...
  12. adamuk

    Fracture face analysis

    Hi coreman73, IMHO, the site's useful for fellow engineers to obtain opinions from other engineers, to get maybe a bit of guidance on where they can get help or look more broadly at a problem, or even information on career development, or just some moral support. If you look on the pressure...
  13. adamuk

    Fracture face analysis

    You need to haul these parts off to a qualified professional METALLURGICAL failure analyst if you want better answers. This is obligatory if there are even remote safety implications to a repeat failure. As I read through some of the posts I grew increasingly annoyed by the uninformed...
  14. adamuk

    Using FE to determine residual stresses

    If the material remains below yield then it will behave elastically unless you are in the creep range. Beware that some components can potentially have residual stresses as high as yield if they are welded (see BS7910 appendix Q for example) Adam Potter MEng CEng MIMechE www.ax-ea.co.uk
  15. adamuk

    How to figure computing time into cost proposal

    You have to recover the cost of the original purchase of the software & hardware plus the ongoing licencing costs, so add up how many jobs you expect to do in a year and divide by the number of hours in the year you are having them working. Add a percentage and bob's your builder... Or anyway...
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