Enersol Whitepapers

Subatmospheric pressure air leakage testing (ISO 80369 and ISO 18250) in laboratories located at high elevations.

The ISO 80369 and ISO 18250 series of standards include a leakage test that requires the application of a subatmospheric pressure to a connection between a small bore connector or reservoir connector and a reference connector.

Enersol's Automated Subatmospheric Pressure Air Leakage Tester has been designed specifically for this test. These models are automated test systems designed for use by any testing laboratory where this test needs to be carried out. The equipment is simple to use and has a touch-screen interface. It also automatically calculates the leakage rate, which is used to determine whether the sample under test conforms with the performance requirements of the standard.

Some of the standards in the series such as ISO 18250-8, ISO 80369-6 and ISO 80369-7 require a pressure to be applied in the range of 80 kPa to 88 kPa below atmospheric pressure. These pressures are achievable at most locations on Earth though it is difficult to achieve from about 1200 m above sea level, and it is not directly achievable from an elevation of about 1900 m above sea level.

Enersol has written a whitepaper on this issue and developed specialised equipment to suit higher elevations. The Enersol Automated Subatmospheric Pressure Air Leakage tester for high elevations is known as S78BH. It is similar to the normal models, though it also includes a pressurised chamber to create an atmosphere where 80 kPa to 88 kPa below that atmosphere, is achievable. The S78BH is recommended for laboratories located from about 900 m above sea level.

The full whitepaper can be accessed here: Subatmospheric pressure and location above sea level

Determining the volume under test for the pressure decay and subatmospheric pressure air leakage tests in the ISO 80369 series and ISO 18250 series.

The ISO 80369 and ISO 18250 series of standards include leakage tests that require the application of a positive or subatmospheric pressure to a connection between a small bore connector or reservoir connector and a reference connector. The test methods include formulas that are used to calculate the leakage rate. At the end of the test the leakage rate is assessed to determine whether the sample under test conforms with the performance requirements of the standard.

Enersol's Automated Subatmospheric Pressure Air Leakage Tester has been designed for the subatmospheric pressure air leakage test, and similarly the Automated Pressure Decay Tester has been designed for the pressure decay test. Both systems are automated, easy to use, have a touch-screen interface, and, calculate the leakage rate at the end of the test.

The leakage rate formulas contain a number of components of which one is an internal volume (v). This internal volume must be determined and the standard does not provide any guidance on how to do this.

The definition of the volume differs slightly between the pressure decay and subatmospheric pressure air leakage methods, and the definition is also ambiguous. Enersol's interpretation of the internal volume is that it includes all the parts of the test system that are pressurised (or evacuated). Enersol has written a whitepaper about this issue to provide laboratories with some guidance as to how to determine the internal volume under test.

The full whitepaper can be accessed here: Determining volume under test (ISO 80369 / ISO 18250)

Last updated: June 2021

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