Find hole size for allowable leak in pressure vessel

  • Thread starter bgaw
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  • #1
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Summary:
Need to find the hole size for an an allowable leak in a small, low pressure vessel.
Hello, all. I am completely new here so please be gentle.

I have a small, cylindrical, sealed ("no leak") pressure vessel with an approximate volume of 27 cm3. It has a constant supply of air pressure at 8"WC. I'm trying to figure out how big of a hole it can have if there is an allowable leak/flow rate of 1.00 sccm.

I feel like this isn't that hard of a problem and I should probably know how to do it, but alas I've been out or school for awhile and I do not. And I haven't been able to find anything in my internet searches that seem to tackle this problem. Most of what I can find deals with water and the Bernoulli equation, but I don't think that applies here. I'm pretty sure I'm missing some information/data. I'm not necessarily looking for an exact answer, but mostly just how to do this as I may need to do other versions of this in the future. Thank you in advance.
 

Answers and Replies

  • #2
Baluncore
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Welcome to PF.
How long is the hole, how thick is the cylinder wall ?
What shape is the hole ?
 
  • #3
BvU
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Haello @bgaw ,
:welcome: ##\qquad ##!​
.. to find anything in my internet searches
Funny, a search for 'orifice air flow' yields a lot of useful stuff ! Even a calculator, but perhaps it's more useful to look through the equations to see if they apply for your range of ##\Delta p##

##\ ##
 
  • #4
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Welcome to PF.
How long is the hole, how thick is the cylinder wall ?
What shape is the hole ?
The wall thickness is 0.06". And the hole will be round.
 
  • #5
BvU
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Expanding: google search for 'vapour leak flow' has this in fourth place, with some formulas on page 8/9.

Incidentally, the calculator gives me a worst case initial guess of 19 ##\mu\textsf {m}##:
1638484748727.png

1638484768150.png


Where I am assuming sccm is 10-6 Nm3/min

##\ ##
 
  • #6
BvU
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The wall thickness is 0.06". And the hole will be round.
So the 19 ##\mu##m is ##<<## 1500 ##\mu##m (0.06") and you want to include a pressure drop over the narrow channel ...

##\ ##
 

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