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Recent content by AK8824

  1. AK8824

    Seismic Design of Columns using NBC 2015

    I am working on design of a column using NBC 2015. Base Shear calculations performed by Compress calculates the Base Shear using NBC 2015 and reduces it be multiply 2/3 to it. The argument is that NBC 2015 is based on Limit State Design whereas ASME is based on Allowable Stress Design. Has...
  2. AK8824

    Removal of Lifting Lugs and Trunnions

    Hi r6155, Thanks for quoting the reference from Pressure Vessel Design Manual, by D. Moss. 4th Ed. In fact, I am in agreement with you and others. What is noteworthy is that the requirement of lifting lug removal was not there in Shell DEP in Version 20. But it was added in Version 32. Your...
  3. AK8824

    Removal of Lifting Lugs and Trunnions

    MJCronin, I learnt from some friends that Ear-type lifting lugs typically suffer from the problem of corrosion due to trapped water between the lug and the vessel. There are more chances of corrosion under insulation in the trunnion region. As the trunnion projects like a fin on the vessel...
  4. AK8824

    Removal of Lifting Lugs and Trunnions

    Thanks all of you for your valuable input. MJCronin, This requirement comes from Shell DEP 31.22.20.31, Pressure Vessels (Amendments/supplements to ASME Section VIII Division 1 and Division 2), para 4.15.6 of Version 32, which reads: Lifting lugs and trunnions shall be removed after erection...
  5. AK8824

    Removal of Lifting Lugs and Trunnions

    In a middle-eastern refinery project, client specification calls for removal of Lifting Lugs and Trunnions after erection. As would be expected of contractors, they are seeking Waiver against this requirement. The reason put forth is that there is no value in removing them. What is industry...
  6. AK8824

    Internal Coating of Storage Tank

    Thank you IFRs. I am discussing with the client and will most probably allow cutting a door-sheet. AKumar
  7. AK8824

    Internal Coating of Storage Tank

    Thank you, MJCronin and JStephen for your prompt replies. Really appreciate it. Thanks again. AKumar
  8. AK8824

    Internal Coating of Storage Tank

    I am working on a new refinery project in the middle-east where for internal coating application contractor is seeking to cut open the shell approximately 3.5 m x 3 m to allow easy entry of coating application equipment such as a man-lift. The tank has already been hydro-tested. Contractor...
  9. AK8824

    API 12F tank: Minimum Temperature Limit

    Dear Forum Members, Up to what minimum design metal temperature an API 12F tank can be used? I have a vendor offering API 12F tank to be used in Alberta (-45°C). Any help would be appreciated. Thanks. AK
  10. AK8824

    Air Testing of Storage Tanks to Annex F.4.4

    Duwe6, Anchors are not required in my case. The question is about the practice. How do you comply with API 650 F.4.4 in terms of testing the vents. API states- Tank vents shall be tested during or after this test. Do you test the vets? Do you test them during the Air Test Do you test them...
  11. AK8824

    Air Testing of Roof

    JStephen, Thank you for your advice. I agree with you. The tank in my case is to be blanketed using fuel gas. Therefore, we must make sure there is no leakage whatsoever. Ashok
  12. AK8824

    Air Testing of Roof

    Thank you for your replies. I am sorry, I should have converted 1.45 kPa to water column. Well, the stand-pipe would be about 150 mm tall. My feeling is that testing with water may not be able to reveal the leak for a gas-tight roof. But, in the past I have heard from some fabricators they...
  13. AK8824

    Air Testing of Roof

    Air Testing of roof is required as per the following clause in API 650: F.4.4 When the entire tank is completed, it shall be filled with water to the top angle or the design liquid level, and the design internal air pressure shall be applied to the enclosed space above the water level and held...
  14. AK8824

    Geodesic Dome Roof Literature

    I got an opportunity of ordering Geodesic Dome roof for a tank in UAE. That was for water service. I got in touch with couple companies and then ordered on a German company named - Vacono, website www.vacono.com. Hope this helps.
  15. AK8824

    Air Testing of Storage Tanks to Annex F.4.4

    I have a question about Air Testing of storage tanks. API 650 Annex F.4.4 calls for testing of vents during or after the Air Test. See extract below: F.4.4 When the entire tank is completed, it shall be filled with water to the top angle or the design liquid level, and the design internal...
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