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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
