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  1. jnleroux

    Help determining Stress values

    The allowable stress for temperatures between -20 °F to 650 °F up to 1998 for SA-283 Gr. C and SA-285 Gr. C was 13.8 ksi.
  2. jnleroux

    Effective Gasket Width width for self-energized gasket.

    In my opinion, the design you show with the gasket described would create no measureable moment between the gasket and the bolts. The closest Figure UG-34 design would be (p), which corresponds to a flat faced gasket that also has no edge moment loading. This this in mind, the design...
  3. jnleroux

    API 653 FFS Evaluation for Hydrotest

    We were recently considering a hydrostatic test exemption, following API-653. The repair of the annular plate was considered major and did not fall under the shell repair or minor shell jacking sections. This left the fitness for service evaluation for hydrotest exemption. Although the...
  4. jnleroux

    API 570 Temporary Repairs

    Good question. Good answer as well. It makes sense to base the life on the known corrosion rate and inspect on the half life.
  5. jnleroux

    API 570 Temporary Repairs

    API 570 states that “Temporary repairs may remain in place for a longer period of time only if approved and documented by the piping engineer.” Assuming a full encirclement sleeve has been designed for appropriate stress conditions, can “longer” be considered to be the life of the enclosed...
  6. jnleroux

    Davit Design

    Lee, You should be able to use the design for the 12" on the 8" & 10". The material lists 5/8" eye-bolt and plate. With this size, you will still have nearly 0.25" on both edges of the flange for a fillet weld (8" - 150#). The davit will be a little over designed, but shouldn't present a...
  7. jnleroux

    Davit Design

    Pressure Vessel Handbook by Eugene Megyesy has a page on horizontal and vertical opening manway davits. It does not go through calculations, but rather drawings with a table covering different cover sizes. These range from 150# to 900# and 12" to 24".
  8. jnleroux

    Atmospheric Iron Oxide Thickness

    Has anyone found a documented conversion for estimate wall loss when provided with a section of Iron Oxide taken from carbon steel? I have heard estimates ranging from 5:1 to 8:1, but have not found anything documented.
  9. jnleroux

    ASME VIII, Div 1: UG-135 PRV Inlet Size

    Follow up note: ASME Code Case 2211 allows for this situation, subject to jurisdictional approval.
  10. jnleroux

    Line blank material choice in 9Cr material specifications

    I agree, typically piping systems don't use 9 Chrome when 5 Chrome can be used. Since ASME B16.48, section 2.2.3 states that mixed material joints (including blanks) need to use the lower rating, make sure that the working pressure from B16.5 for the material is high enough for your application...
  11. jnleroux

    Line blank material choice in 9Cr material specifications

    ASME B16.48 states that blank materials shall be in accordance with ASME B16.5, Table 1A. 9 Chrome material is listed on Table 1A under A 182 Gr. F9. I would use 9 Chrome for most operating cases, but as pennpiper, would consider using another material if there would be no way that the blind...
  12. jnleroux

    Heat exchangers tubes retubing

    Luis, About 12 years ago, I spent several years working as a contractor performing IRIS inspections on heat exchangers. At the time, the majority of the refineries took action when they saw 50% wall loss. The action varied, based on time in service (corrosion rate), number of tubes that...
  13. jnleroux

    ASME VIII, Div 1: UG-135 PRV Inlet Size

    UG-125 states that all pressure vessels within the scope of this division, irrespective of size or pressure, shall be provided with pressure relief devices... UG-135(b)(1) states The opening through all pipe, fittings, and non reclosing pressure relief devices between a pressure vessel and its...
  14. jnleroux

    70/30 Cu-Ni Wall thickness calc.

    The standard wall thicknesses for seamless copper pipe can be found under ASME II, SB-42, "Specification for Seamless Copper Pipe, Standard Sizes". The ODs are the same as carbon steel, but the thicknesses are different. For example, standard wall for a 1" carbon steel pipe is 0.133", where...
  15. jnleroux

    Coke Drum External Cracking

    JJPellin, That type of information helps since I am looking for industry experience. Thanks, John
  16. jnleroux

    Coke Drum External Cracking

    Thanks for the information. My original post was lacking some information. We have two Cr-½Mo Coke drums that were installed in 1979. External cracking in the bottom section of the drums were removed by grinding/weld repair, however PWHT resulted in new cracks. These new cracks were removed...
  17. jnleroux

    Coke Drum External Cracking

    Does anyone have experience with external cracking in the lower third of their coke drums? Also, how did you address or plan to address the situation? Thanks, John Leroux

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