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  1. grandnobi

    Elbow Standard

    Maybe the elbow is from Russia and was built to GOST dimensions.
  2. grandnobi

    Article on calculation on friction factor

    Hans Hendrik, Chemical Engineering Magazine has published a book on piping engineering containing numerous interesting articles from the 70-ties. You will find your requested article on pages 94 and 95 of this book: Process Piping Systems (Chemical Engineering) Hardcover: 482 pages Publisher...
  3. grandnobi

    Pressure Rating for Dual Cert. Flange (304/304L)?

    jproj See also Interpretation 2-40 to ASME B16.5: http://cstools.asme.org/csconnect/pdf/CommitteeFiles/28086.pdf
  4. grandnobi

    Piping Materials Guide

    "Piping Materials Guide" by Peter Smith 1st Edition, 2005 The back cover calls it "the only book of its kind on the market." Well..., I was not impressed, though. Ever since I have read the book open-eyed for the first time I have wanted start a thread compiling the surprisingly high number...
  5. grandnobi

    Welding of slip-on flanges

    I am neither questioning that double-welding of slip-on flanges is a good and recommended practice, nor is it my intention to encourage anybody to single-weld slip-on flanges. However, mbc2009 is wrong in stating that double-welding was a general mandatory requirement by all piping codes. e.g...
  6. grandnobi

    Water weight of elbow

    guys, do we really need fancy computer programs to determine the volume of a quarter donut? http://en.wikipedia.org/wiki/Torus ... o tempora, o mores... ;-)
  7. grandnobi

    model review

    Hi essenwood, check this link for further inspiration on items to be reviewed: http://www.red-bag.com/jcms/index.php/design-guides/46-design-guides/356-bn-dg-c12-checking-a-3d-pds-piping-model-and-definition-of-percentage-completion
  8. grandnobi

    Total pipe length in a piping isometric drawing

    More wild guesses: The material listed in the BOM might include same extra straight pipe length to fabricate - wear pads for sliding supports, - reinforcing pads for branches, - trunnions for pipe supports, - dummy supports, - mitered elbows, - field bends (small bore piping), - spool...
  9. grandnobi

    Welding of tread joints

    BJaffa, provided the work you are going to perform is to seal weld a threaded joint on a piping system the code provision you are looking for is: ASME B31.3 (2006) Par. 328.5.3 Seal welds shall cover all exposed threads or respectively ASME B31.1 (2004) Par. 127.4.5 Where seal welding of...
  10. grandnobi

    boiler commissioning publication

    VinW, your description sound like Guideline VBG-R 513 e "Internal Cleaning of Water-Tube Steam Generating Plants and Associated Pipework" published by VGB PowerTech e.V. www.vgb.org obtainable from http://www.vgb.org/shop/product_info.php/products_id/70
  11. grandnobi

    weldolet and hot tapping

    Reading this thread I had a feeling that it may just not be good enough to ask whether the branch connection will be adequately designed once the tie-in is done. You also have to find a safe way to get there. Is everybody in this forum really convinced that a welder assigned to the job of...
  12. grandnobi

    Tilting Disc Check vs Swing Check Valve

    What I hate most about tilting disc check valves is the restricted accessibility for maintentance. The body of a swing check valve typically is equipped with a separate flanged cover plate. This allows you to access the flapper for maintenance or to remove the flapper for line testing and...
  13. grandnobi

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

    ...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*.
  14. grandnobi

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

    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.
  15. grandnobi

    WOG valves

    Degas, I agree with Ashereng, there is no relation between ANSI and WOG. See also MSS-SP 25 "Standard Marking Systems for Valves, Fittings, Flanges and Unions", which is one of the few standards explaining the meaning of "WOG". Quote from Par. 4.1.3. ( in my 1998 ed.): The Rating Designation...
  16. grandnobi

    Small size fitting and wrought steel

    1969grad, A234 are not castings. See ASTM A 234 - Par.1.3: "This specification does not cover cast welding fittings or fittings machined from castings. Cast steel welding fittings are governed by Specifications A 216/A 216M and A 217/A 217M."
  17. grandnobi

    WOG valves

    leojose, Reference to the abreviation "WOG" is made in MSS SP-25 (in my 1998 Ed. it's a note to Par. 4.1.3). "WOG" (water, oil, gas pressure) is said to correspond to "CWP" (Cold Working Pressure). CWP is the maximum pressure rating allowed under normal "anbient" temperature conditions, which...
  18. grandnobi

    Chemical Plant Design

    Hi doogtop, Am I right in assuming, that you are looking for ANY information on equipment designation, just to give you a rough idea what could be current practice in the industry? If -in addition- you are looking for FREE information, "the usual suspects" probably are: NORSOK...
  19. grandnobi

    Symbol on side of Globe Valve

    jeni333, IMHO this symbol does not represent the flow through the seat as mentioned by zdas04, but the internals of the valve in a cross-sectional view. The horizontal line represents the disc. Thus the normal flow (up through the seat) would be from left to right. See also the pictures shown...
  20. grandnobi

    Ansi b16.5 tabela 3

    Table 3 of ASME B16.5 is not a stand-alone document. You first have to fully understand the pertaining paragraph ("Flange Facing Finish Imperfections") of ASME B16.5 before you can successfully use Table 3. The paragraph reads as follows: "Imperfections in the flange facing finish shall not...

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