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Recent content by JES1812

  1. JES1812

    Distance Between Intermediate Wind Girders

    I am designing a tank that requires multiple intermediate wind girders. API 650 merely states that "..a second intermediate girder shall be used to reduce the height of the unstiffened shell to a height less than the maximum". Is there a general rule of thumb as to how this is interpreted?
  2. JES1812

    Vacuum box testing

    An issue came up recently regarding vacuum box testing of repad welds to new tank floor plate. One view is that these should be treated like repair area patch plates and be vac box tested. 653 9.10.3.1 says that wear plates shall be installed per 9.10.1 and examined by 12.1.7 653 12.1.7.1 says...
  3. JES1812

    Repair of hot tap nozzles

    mk3223 The nozzle hot tap was completed per API-653 based on records kept at the time.
  4. JES1812

    Repair of hot tap nozzles

    Thanks IFR, and yes, the tank will be out of service. There is external piping attached to the nozzle in question. When you say "replace with API 650 nozzle" are you suggesting that we should cut out the existing hot tap nozzle and install a new nozzle? Is there a way that we can trim and weld...
  5. JES1812

    Repair of hot tap nozzles

    A tank we are working has a 6" hot tapped nozzle. Do we need to modify the internal shell to make this a full penetration weld? If so, what is the best way to do this?
  6. JES1812

    Bearing Plates for Tank Columns

    We are in the process of repairing a storage tank. We added a secondary floor and trimmed the columns to suit. So we have new floor plate and new column bearing plates. API 653 has rules regarding minimum overlap for patches on a tank floor. A question came up re: overlap of the bearing...
  7. JES1812

    Units of pressure in MathCad 15

    Hi I am working with an equation where the inputs are ft and lbf, but the equation has a constant so that the units of the answer are "WC (inches of water column). I can create a unit for "WC (equating it to psi or psf) but how can I work with the conversion constant in the equation so that...
  8. JES1812

    API 650 Appendix F - max design pressure

    JStephen, IFRs, Thanks for the responses. Another question, in F.4.2 when calculating the weight of shell and structural attachments (for evaluating WDL), do you include the floor plate as well? I assume the intent is the total weight of the tank, minus the roof and any roof structure.
  9. JES1812

    API 650 Appendix F - max design pressure

    I am checking the allowable internal pressure for a tank designed to API 650. The plant wants to add a nitrogen blanket and the process engineer wants this information in order to design the pressure-vacuum relief valve. I was using the equation in F.4.1, which includes the tank diameter, but...
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