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  1. tankSnvessels

    NACE MR0175 umbrella covers HIC for plate material

    Thank you very much J Stephen. Yes I had read all the clauses, checked Table 1 exclusions and Annex B. The question is if we do not mention to the plate vendor of any exclusions is he bound to give us plate material including HIC resistant?
  2. tankSnvessels

    NACE MR0175 umbrella covers HIC for plate material

    I have come again to that fork road where my Engineer mentions in Plate Material Spec "+NACE MR0175" when we expect the plate vendor to quote for sour service, i.e. HIC resistant. But the vendor says he quoted with NACE but without HIC? Scope of NACE MR0175 states it “…addresses all mechanisms...
  3. tankSnvessels

    SA-573 Gr.70 and SA-516 Gr.70 are they the same?

    A516 is far superior material than A573. A573 cannot be used in pressure vessels. A516 can be used for tanks and vessels both.
  4. tankSnvessels

    Size and definition of storage tank; API 650

    Dear eng471, I agree with bimr's three answers. "bimr" replied you to the point as I would. 1) HG.= High or Height (HT/HG) 2) Shell highest level stiffening angle 3) I support your understanding: 3 PSIg internal pressure and 2 PSIg Vacuum pressure
  5. tankSnvessels

    Nozzle sizes 2B, 3B on ASME Sec VIII Div 1 Vessel (16" Pipe Shell)

    Dear racookpe1978, Thanks for the advise. I was looking for some technical reference. It may be just the size, 2NPS and 3NPS and I am using those, but would like to know why people use this, on what basis? Thanks again.
  6. tankSnvessels

    Nozzle sizes 2B, 3B on ASME Sec VIII Div 1 Vessel (16" Pipe Shell)

    Dear Forum members, I came across a vessel Input data from client. Client has marked 2B and 3B as nozzle sizes. I believe these are 2NPS and 2NPS nozzles. But any references of these are most welcome please. I came across a mute thread also, but no one has posted what was the result later...
  7. tankSnvessels

    Sel fixed roof or fixed roof ?

    Dear Friend, your question I believe is self supported or supported roof. You are clear you need a fixed roof. So to add to your clarity, it can easily be self-supported cone roof tank. But as some members pointed out, I would like to clearly indicate, check if you are storing crude palm oil or...
  8. tankSnvessels

    Shell Plate Buckling

    First of all, I don't think it is buckling as you term it. Second as you've added stiffener, would you like to re check your top shell thickness? Third: Hope you do not have external pressure, applicable to App. V. If so , refer App. V and try to follow else you may have to use Sec VIII Div 1...
  9. tankSnvessels

    Requirement of Top Wind Girder

    To exactly answer your question, read 5.9.1 of API 650. So if you are designing an Open roof or floating roof tank per App. C, you need Wind Girder, this API 650 says, which means the committee feels there is a necessity to maintain the roundness under wind conditions. Beyond this if you may...
  10. tankSnvessels

    Emergency Venting as per API 2000

    If you would have noted, many foot notes in API 2000 refer as, "...by using the latent heat of vaporization of hexane...". So the code wants to clarify that they have considered at the max for hexane. If you have to design for something more severe than this, than you cannot just use the tables...
  11. tankSnvessels

    Severely deformed saddle

    Sounds as a very practical approach. Remove the base plate (lower most) and add gussets from vertical supports if required.

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