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  1. VPbris

    Top head lifting lug as per MOSS 4th ed - Problem with units

    No problems!, Yes, weld leg is w3
  2. VPbris

    Top head lifting lug as per MOSS 4th ed - Problem with units

    If Fs is N*mm^-2 w3 would be mm^3
  3. VPbris

    Top head lifting lug as per MOSS 4th ed - Problem with units

    Hi guys, I'm building a Mathcad sheet for designing top head lifting lugs using the method on Pressure Vessel Design Manual - Moss 4th ed. I am having some trouble with the units. On page Procedure 10-6 (page 693), when calculating the Pad Eye Weld, i'm getting strange units. the formulas...
  4. VPbris

    Allowable bends and formings in piping

    Thank you for the clarification of the name of the piece in english, thats an exactly it. @LittleInch Could you elaborate on why you think this is not a good idea? On Cryogenic vessels all connections are usually welded for two reasons one is that the inner tank is not acessible once fully...
  5. VPbris

    Allowable bends and formings in piping

    Hi, Thank you for your replys, Answering some general questions: Yes it is a pressure vessel, operates at 17 barg, temperature of inner vessel ranges about -140 to -180 degrees celsius. Material of piping and vessel is Austenitic SS. I also agree most bends are to allow expansion/contraction...
  6. VPbris

    Allowable bends and formings in piping

    Hi Not trying to reverse engineer this. I actually have all the drawings and full acess to manufacturing site during production. I am trying to have some code reference, as these piping are made that way by 'experience' and the is no documented paper on the company, so I'm trying to evaluate...
  7. VPbris

    Allowable bends and formings in piping

    Hi, I was looking at the internal piping of a Liquid Oxygen truck (picture in annex). I noticed these formings and bends of the piping and some questions came to my mind. (https://files.engineering.com/getfile.aspx?folder=b0aa845c-dbbe-4aff-b4cc-b9a18f9c9785&file=20181009_084626.jpg) 1- What...
  8. VPbris

    Ambient Vaporizer - Capacity flow Estimation

    Hi, Ambient Vaporizers are equipment used to vaporize liquified gases. (Figure: https://www.praxairdirect.com/Industrial-Gas-and-Welding-Information-Center/_images/_cylinders-tanks-and-gas-systems/Ambient-Vaporizers.png). (Input temperature is about -180C) I have some design examples and am...
  9. VPbris

    Cold Stretching in Practice

    Hi, Sorry for the long time to reply, 1-I agree with you that excess material thickness would prevent shell from stretching enough, but as you said P is design pressure, shouldn't it be MAWP? Can anyone clarify on that? 2- Seems like a good interval, i agree with you. However I'm still on...
  10. VPbris

    Cold Stretching in Practice

    Hi, I'd like some advice on performing cold stretching for a vessel intended for cryogenic storage (ASME VIII-1 Mand App 44). I will list some items for discussion. 1- Pc (cold stretching pressure) is said to be between 1.5P and 1.6P(inclusive). Do I need to keep this value constant during the...
  11. VPbris

    R717 (ammonia) refrigerant storage vessel

    Hi, I'm designing a storage vessel for R717 refrigerant. Usually when I design those I specify normalized carbon steel (usually 516gr70N)and PWHT, and also recommend that if possible the addition of 0.2% of water, all that to avoid stress corrosion cracking. All vessels I've designed for...
  12. VPbris

    Load Combination - Cargo Tank

    Hi, I'm studying ASME XII which is very similar in many aspects to ASME VIII-1. During my studies I came up with some questions hope you could provide me some help. There is a picture of the load combinations attached from (1-1.4). 1st. I'll treat the vessel as a beam, so in order to account...
  13. VPbris

    Saddle design per MOSS

    Hi, I`m trying to figure out two steps on the design of support saddles using MOSS`s Pressure Vessel Design Manual, I`m using the 4th edition, On Procedure 4-11, pages 270 and 271 (Page 181 on 3rd edition), in order to determine the baseplate thickness it first determines the bending moment...
  14. VPbris

    Small Leg Supported Alcohol Tank

    Hi, I've been asked by a customer to design an atomspheric tank for process use. The tank is vented to the atmosphere on the top part so it is atmospheric pressure. Only load to be considered than is hydrostatic pressure due to the fluid. The dimensions are Diameter 3800 mm T/T Height 6000 mm...
  15. VPbris

    Pressure after Needle Valve and Rotameter

    The way I see is the following If there is a flow, then there is a pressure difference. At the end of the piping (at the burner) the pressure will be atm, and until it reaches there, there will be a gradient in pressure along the piping. So depending on the distance from the pressure source...
  16. VPbris

    Help understanding diagram for differential pressure measurement n

    Hi Compositepro Yes you guessed correctly, this is a refrigerated unit. Thanks for the reply, makes sense to me now. Just one more question, just to check, it appears to me that the reference height for my DP gauge will be at the tip of the inverted U (gas trap) inside the tank, hence in...
  17. VPbris

    Help understanding diagram for differential pressure measurement n

    Hi Guys, I'm a junior engineer I need some help understanding some principles on the aplication of a differential pressure gauge to measure liquid level on a CO2 tank. (the tanks operates at 16 - 24 bar for co2 storage). Probably is a very easy question, but I could not figure out myself...
  18. VPbris

    Local Loads on Heads , help with Possible WRC Application

    Hi guys, sorry for the late reply, @TGS4 I really appreciate your advice. Unfortunately I do not have access to these professionals and mentoring at the moment, so I have to go the harder way. I'm studying more about FEA on vessels and getting more familiar with div 2. Hopefully someday I can...
  19. VPbris

    Local Loads on Heads , help with Possible WRC Application

    Hi, Thank you for your replies. @TGS4 I agree with you. When you say I'd have to do something much further, could you please point me into the right direction? Any inputs or references would be greatly appreciated. (PS: As I said I`m not familiar with the WRC procedures, are they applicable...
  20. VPbris

    Local Loads on Heads , help with Possible WRC Application

    Hi, I need some guidance on assessing some local loads on a torispheric head. It is a vessel for cryogenic Argon storage, for those who are not familiarized with it, it consists of an stainless steel vessel inside of a carbon steel vessel. The space between the vessels is filled with a powder...

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