3 replies to this topic

[black friday]

Hi all,
I'm just starting some new work testing some valves on site to ascertain their leak rates. I see a lot of leak rates specified in units such as mbar.L/s or pa.L/s etc. I was wondering how this is applied to liquids. For a compressible fluid I understand that these units are effectively a mass flow rate assuming ideality, but for a liquid do they still apply or should I just use L/s or a mass flow rate?
I don't understand why for a liquid the inclusion of the pressure is done.
Thanks.

[Zauberberg]

The higher the pressure is, the higher is the leakage rate - for the same open area, regardless of the fluid phase. Correct?

[Shivshankar]

HI BF,

Please find attached and below link,

¨Hope this gives some insight.

http://www.epa.gov/a...2/rate/rate.htm

http://www.adixen.co...n,358,ppar.html

http://www.atcinc.ne...ing-Methods.pdf


Regards
Shivshankar

Attached Files

•  gas_leak_rates.pdf   415.46K   13 downloads
•  leak-rate_definition.pdf   145.72K   11 downloads

Edited by Shivshankar, 16 May 2012 - 02:47 AM.

[black friday]

Thank you for the replies guys.

Zauberberg, if it were related to leakage rates being greater at higher pressures wouldn't the units be L/(sec.mbar) ? Or am i offbase here?

Edited by black friday, 16 May 2012 - 08:05 PM.