Correlating Leak Rates for Helium, Air & R134a - Michael

  • Thread starter Thread starter djsnow
  • Start date Start date
  • Tags Tags
    Correlation Rate
AI Thread Summary
Michael seeks assistance in correlating leak rates for Helium, Air, and R134a to standardize testing methods. He aims to equate specific leak rates across different gases and pressures, preferably consolidating to air as the common standard. Challenges include understanding variables like compressibility factor and real gas density, particularly for R134a. Suggestions include exploring viscosity's role in leak rates and consulting resources on gas properties, with recommendations for specific websites for further information. The discussion emphasizes the importance of accurate data for effective leak testing across different gases.
djsnow
Messages
2
Reaction score
0
Hi
I am i new member, i hope i am posting in the correct forum. I require some help i with a problem i am trying to solve in my work. Currently we have 3 separate leak test methods specified for a part all with different working gases and pressures. If possible, i would like to correlate this data so that i can determine that a specified leak rate of "X" with Helium at 700kPa is equal to a leak of "y" with Air at 1.0MPa is equal to a leak of "Z" with R134a at 2.1MPa. The aim being to commonise to one spec (preferably air).
I have done some work on this to based on info in found around the web, in particular this site:
www.air-dispersion.com/msource.html
I am struggling with a few variables used in the formula, in particular compressability factor and real gas density and a few others of R134a.
My question, is there another way to go about solving this problem that anyone might be able to help me with? Does anyone know where i can get some properties tables on the web on R134a at different pressures and temps (and helium for that matter) that could also assist me.
Thanks in advance, any help you can offer will be greatly appreciated.

Michael
Australia
 
Physics news on Phys.org
I think that your are concerned about small leaks. If this is the case, the leak rate is determined by the pressure difference and the gas viscosity. And this is the main word: viscosity. It depends on the gas and on the temperature. You can learn about this in wikipedia.
The reference that you give if for "big" holes.
 
Thankyou, i will look into this but i still think that i will need some information that i do not have, any oher suggestiong would be helpful.
 

Thread 'Need help understanding particle physics and quantum physics'

So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
View full post »

Thread 'The Physics of unloading sand from a barge'

I think it's easist first to watch a short vidio clip I find these videos very relaxing to watch .. I got to thinking is this being done in the most efficient way? The sand has to be suspended in the water to move it to the outlet ... The faster the water , the more turbulance and the sand stays suspended, so it seems to me the rule of thumb is the hose be aimed towards the outlet at all times .. Many times the workers hit the sand directly which will greatly reduce the water...
View full post »

Similar threads

I Was the recent ISS leak imminently dangerous?
Replies
14
Views
2K
Good valve for really small flow rates?
Replies
10
Views
2K
How can I calculate the volume of leaked gas in a leak testing project?
Replies
1
Views
2K
Gas in a semi permeable membrane - one for the gas experts
Replies
4
Views
2K
B Why Does My Vacuum Leak Rate Change at 25 Microns of Mercury?
Replies
14
Views
2K
How Do Helium Leak Detectors Work?
Replies
4
Views
4K
I How to protect liquid filled pods from leaking on a plane
Replies
11
Views
7K
Calculating Compressed air leaks within a system
Replies
3
Views
17K
How to calculate the leak rate based on pressure drop
Replies
4
Views
5K
Problem with Ansys Maxwell "current leak to the air"
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top