Question

How to work out "Leak-Before-Break" on a pressure vessel.
This will be used to help identify a suitable material/ materials hence the material is currently not chosen nor is the wall thickness.
Constraints:-
Internal working pressure 10,000 PSI or 6.8948e+7pa but will need to also have a safety factor of 2.25 = 22,500PSI or 1.55132e+8pa.
Volume=0.8619m^3.
Internal radius is 0.4m.
Free Variables:-
Material (must be composite)
Wall thickness

Answer 1

Other working out for the same question

Answer 2

What do you mean, it's all given?

Answer 3

sorry where have I put its all given?

Answer 4

I don't understand your question

Answer 5

Can you explain what exactly you need help with

Answer 6

I need to have a complete equation that gives an answer for a leak before break scenario on a pressure vessel.

Answer 7

What is this then..

Answer 8

Wasn't sure that was correct hence why I put it in the word document attached. Question is though how can I put my data in this question to get an answer

Answer 9

Ah gotcha

Answer 10

From your equation I get you need the toughness of the material and the standard deviation, but I've never done this, it seems @Michele_Laino will know :)

Answer 11

hint:
we can apply this formula:
\[\huge t = \frac{{pD}}{{200\sigma Z}}\]
where \(p\) is the interior pressure, \(\sigma\) is the unit tension of safety, it depends on material, and \(Z\) is a coefficient which depends on the welding type

Answer 12

Ah so that's what it is!

Answer 13

yes! it is the formula of \(Amburgo\)

Answer 14

Interesting :P

Answer 15

quick question @Michele_Laino if my material is a composite with no welding what do I put for z

Answer 16

more precisely:
\(p\) is measured in \(kPa\)
\(D\) is the diameter, which is measured in \(mm\)
\(\sigma\) is measured in \(N/mm^2\)

Answer 17

I don't know, the value of \(Z\) in the case of composite material, nevertheless, from my textbook, I read that the range of value for \(Z\), can be from \(0.5\) to \(0.8\). Such range refers to the welding case

Answer 18

I have an old textbook, and there, it speaks still of welding

Answer 19

would this be due to composite pressure vessels being relatively new.

Answer 20

yes! I think so!

Answer 21

oops.. of course, \(t\) stands for thickness

Answer 22

What if we were to make up a requirement for thickness to be **.

Answer 23

In that case , I think that we can ask for the material type needed for making such vessel

Answer 24

the problem is I shall be researching into possible materials. this is why I need some values first so when I use CES edupack it helps reduce the materials available.