How is bubble point measured?
The bubble point method is based on the principle that the critical pressure of an airflow applied across the thickness of a fabric evacuates the fluid trapped in the pore with the largest pore-throat. Based on the Laplace equation of capillary pressure, the diameter of the largest pore-throat can then be calculated.
What is the bubble point of a filter?
The pressure at which air will pass through a wetted membrane filter. This pressure is correlated to the pore size of the membrane and thus this test can be used to confirm the pore size and integrity of a membrane or filter device.
What filter integrity test is performed at 80% of the filter bubble point?
Diffusion Test
Diffusion Test At a pressure approximately 80% of the minimum bubble point, the gas which diffuses through the membrane is measured to determine a filter’s integrity.
Is bubble point the same as vapor pressure?
The bubble-point pressure of a hydrocarbon liquid at a given temperature is the vapor pressure of that liquid at the same temperature. If the composition and temperature of a hydrocarbon liquid are known, its vapor pressure can be determined by calculating the bubble-point pressure.
What is bubble check?
Bubble testing is the simplest, least expensive method of detecting and assessing leaks. The procedure involves creation of a pressure differential across the package with air (or some other gas) on the high pressure side (inside package) and a water chamber on the low pressure side (outside package).
How does pressure affect bubble point?
When the reservoir is depleted and its pressure falls below the bubble-point pressure, free gas starts to form in the reservoir. Since gas has higher mobility than oil, the producing GOR is expected to increase when the reservoir pressure decreases below the bubble-point pressure.
What is the difference between bubble point and diffusion test?
The bubble point test addresses the issues associated with the diffusion test. This test applies an increasing pressure of air on the upstream side of the filter while monitoring the flow rate of air that is diffusing through the saturated filter membrane.
Why is filter integrity test required?
Incidences of post-use filter failure were detected and the filtered product either discarded or reprocessed. Such damage can cause a flaw, which may allow microbial penetration to the filtrate side. For this reason, post-use integrity testing is mandatory as it allows the detection of such flaws.
Is bubble point higher than dew point?
The limits in the case of gas-liquid phase changes are called the bubble point and the dew point. The names imply which one is which: The bubble point is the point at which the first drop of a liquid mixture begins to vaporize. The dew point is the point at which the first drop of a gaseous mixture begins to condense.
How does a bubble tester work?
The Bubble tester is a GAS leak detector and is intended for in-line installation, and should be connected into the gas system close to the outlet side of the regulator. If you get any bubbles after about 2 seconds you have a leak and should turn the gas off. No bubbles mean no leaks and it is safe to use the gas.