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Recent content by bmoorthy

  1. bmoorthy

    Template types

    Not necessarily. Most of the time ID template is prepared. Most vessels and heat exchangers are ID matched with the adjacent shells and hence ID templates are widely used. OD template is used only when there is a pronounced concaving dimple on the surface.
  2. bmoorthy

    Template types

    The template that is used by the bending machine operator and the template used for checking the profile of the skelp after bending and the template used for checking the shell course in tacked condition and after welding has the same curvature profile. While the chordal length of the template...
  3. bmoorthy

    Nondestructive Examination of ASME B16.5 Flange (Standard)

    For SA-105 flanges, in ASME Sec Viii Div 1, there is no explicit requirement for NDE other than thee need to conduct Visual Examination, this requirement comes from UG 93 (d). Flange face finish shall be assessed as per ASME/ANSI B46.1 (This is from B16.5 clause 6.4.5). In addition to the...
  4. bmoorthy

    Template types

    UG 80 (a1), UG (a2) and UG 80 (b) and Figure UG-29.2 of ASME Sec Viii Div 1. This is for checking the profile of the generally used shapes in a pressure vessel when external pressure is present, in addition UG 81 is also applicable. For items under internal pressure, UG 80 (a1) UG (a2), UG 81
  5. bmoorthy

    Elongation in plate rolling process

    ASME Sec VIII Div 1 Table UG 79-1 and clause UG 79 may help. Let us assume the thickness is 25 mm and the shell diameter is 2500 ID then the % strain as per UG 79-1 for a cylindrical shell (Being formed from a flat plate)= 50 * 25/2500 % = 0.5% (Strain). While you may use the above to find the...
  6. bmoorthy

    Tolerance

    Q: May i know if there is a chart for Tolerance in Vessel Tank Fabrication. A: In ASME Sec VIII Div 1 there is no such chart. Q: May i know the tolerance of a dished Bottom head plate 6mmt with a height of 294 mm and what is the curvature tolerance circumference is 10711. I am using ASME VIII...
  7. bmoorthy

    Corrosion Allowance & Corrosion Rates for various chemicals

    Dear experts, In the mechanical datasheet of equipment, one can see the value for corrosion allowance. When one enquires the mechanical engineer who prepared the datasheet on the basis of providing certain value, reference is made to process datasheet, if you ask the process guys, they refer...
  8. bmoorthy

    Who decides whether a service is a lethal service and what is the basis of such decision.

    Dear experts, I am conversant with the ASME UW 2 requirements and the definitions given therein including the details in various footnotes (general notes, inside ASME Sec VIII Div 1). Mechanical discipline engineers get the information on the service from the process data sheet, which is...
  9. bmoorthy

    ISO 15848-1 Selection of Temperature Class and target temperature

    6A Valves or 6D Valves or API 600 Valves or ISO 17292 or etc etc If API 6A, the data sheet will show you the temp classs and this is given in alphabet such as "K", "L" etc K signifies -60, L signifies -46 and so on.
  10. bmoorthy

    CATHODIC PROTECTION CABLE

    From ISO 15589-2 Cables should be copper-cored, and shall be insulated and sheathed to withstand the prevailing chemical and mechanical conditions. The minimum conductor size for measurement cables shall be 4 mm2. Cables shall be sized such that no excessive voltage drops occur which reduce the...
  11. bmoorthy

    NACE SP0403 and Fittings

    NACE RP 0403 (SP0403) is for Avoiding Caustic Stress Corrosion Cracking of Carbon Steel Refinery Equipment and Piping Does SP0403 apply to fittings? If the fitting is going to be used in Caustic service and if the contract that you entered says that NACE RP/SP 0403 is applicable for a given...
  12. bmoorthy

    A240 vs A276/A479

    1) Comparing Heat treatment conditions A) An item (SS 304) procured under A276 can be Condition A—Annealed Condition S—Strain Hardened—Relatively light cold work Condition B—Relatively severe cold work B) An item (SS 304) procured under A 479 can be Annealed Strain Hardened Level 1 C) An item...
  13. bmoorthy

    Parts of Valve 4" and below from A 479 Bar

    While what fshnvce says may be true in some cases, one should not generalize. Inclusion of a particular product form for valves is not done without knowing the consequences. Some times it is better to have cast or Forged product form as compared to items made from rolled product.While the cast...
  14. bmoorthy

    Choke Valve:: Tungsten Carbide Tip Broken

    gerhardl Thanks, your input reinforces my thoughts.
  15. bmoorthy

    Choke Valve:: Tungsten Carbide Tip Broken

    Photograph of broken Tip attached. http://files.engineering.com/getfile.aspx?folder=3186490b-54aa-47c2-bae5-7c4b1c90f614&file=Chock_valve_WC_Failure.pdf
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