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  1. ZGZtanker

    Whats dif fired and unfired pressure vessel? construction and inservice code for this .

    There is always some discussion when you have a pressure vessel which has a flame inside, but the vessel is equipped with refractory. In that case the vessel is considered unfired as there is no risk of flame impingement on the pressure retaining parts. I have not found this properly explained...
  2. ZGZtanker

    Hydrostatic Test

    In my experience with transport tanks, that can have two goals: 1.- Check that no permanent deformation takes place during the hydrostatic test 2.- Control a cold stretching procedure on austenitic stainless steel during hydrostatic test
  3. ZGZtanker

    Austenitizing heat treatment required for forgings UG-6

    Thank you very much for your confirmation!
  4. ZGZtanker

    Austenitizing heat treatment required for forgings UG-6

    In UG-6 ASME VIII, Div. 1, Edition 2013 some extra requirements have been included for SA-105 forgings to be used as pressure vessel shells. These requirements include an austenitizing heat treatment. According to what I have read, those treatments were the metal temperature is taken above...
  5. ZGZtanker

    Elastomer compatible with methylamines

    Hi btrueblood, Your information about Parker handbook has been very useful. We are finally going to EPR as Parker recomends. Thank you very much. P.D.: difference between EPDM and EPR www.darcoid.com/images/uploads/pdfs/EPRvsEPDM.doc
  6. ZGZtanker

    Elastomer compatible with methylamines

    Thank you both for your help. In fact is from air liquide where I obtained this information. It is very helpful to see that Parker fully agrees with EPDM suitability. Anyway if anybody has field experience with these methylamines I would highly appreciate to confirm EPDM suitability.
  7. ZGZtanker

    Elastomer compatible with methylamines

    Hello, I am having problems with some valves on tank containers transporting anhydrous methylamines (MMA, DMA and TMA). These valves have internally some encapsulated o-rings (silicon inside, FEP outside). After some months seems the methylamines have permeated the FEP envelope reacting with...
  8. ZGZtanker

    Material for Trifluoroacetic acid (TFA) transport tank

    We are quoting a tank for transport of Trifluoroacetic acid (TFA)(UN 2699)at ambient temperature. I have not been able to find much information about recommended steel grades for the transport of this product, just a brief information in a Halocarbon MSDS. Does anybody have some information...
  9. ZGZtanker

    Non circular section tanks

    First of all, thank you for your answers. I have been reading Appendix 13 and it seems it provides formulas for some specific tank shapes. For different shapes it points to U-2 and UG-101. I understand the tank could be calculated using FEA and then tested according to UG-101 to validate the...
  10. ZGZtanker

    Non circular section tanks

    Good morning, We are working on a tank container prototype. The MAWP would be below 0.5 bar (7.35 psi). The section of the tank is not circular, it is "more squared". Does ASME code give any formula or criteria for calculation of these kind of tanks? I attach a sketch just to show the tank...
  11. ZGZtanker

    Liquid Nitrogen Storage and Distribution

    Another possible supplier: http://www.oxymat.dk/ Best regards

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