This International Standard specifies in situ test methods for high efficiency particulate air filters used to limit releases towards the environment (e.g. from nuclear facilities or facilities with aerosol toxic or biological releases). This applies where installations of these filters are used to clean effluent air before discharge to the environment from industrial (including nuclear) installations where toxic/radioactive/biological materials are handled or processed.
This International Standard excludes the application already covered by ISO 14644-3.
The scope of this International Standard includes detail of two methods, either of which applies to the periodic testing of high efficiency filters which are used in demanding applications aiming at protecting the environment, such as the nuclear industry.
In the case of nuclear applications, this International Standard is applicable to installations covered by ISO 17873 (applications other than nuclear reactors) and ISO 26802 (nuclear reactors).
The two reference methods specified in this International Standard are not equivalent, but related to, the requirements to be addressed by the test results. The choice of which of the two methods is adopted in any specific case depends on whether the outcome requires an integrity test or a statutory efficiency accountancy test.
For industries handling or processing radioactive or toxic materials giving rise to a risk of possible release, the main goal of the tests is to confirm that the filter installation is fit for purpose. In the case of integrity tests (Annex B), this is to confirm that no significant leakage of toxic aerosols through the filter installation is possible.
In the case of efficiency accountancy tests (Annex C), the test is designed to make an accurate measurement of decontamination factor with respect to the MPPS size range of particles.
The reference method described in Annex B (integrity test) requires a test aerosol of dispersed oil particles mainly submicrometre in size range, which is stable during the test procedure and compatible with other installation components. Particle concentrations are measured in real time by light scattering instrumentation (optical detectors).
The reference method described in Annex C (efficiency accountancy test) requires a test aerosol of particles having a narrow size range centred on MPPS size range for HEPA filter media. Their concentration both upstream and downstream the filters is measured by fluorimetric analysis of aqueous solution obtained by washing the membrane sampling filters.
It should be noted that the requirements for an efficiency accountancy test also cover the requirements of an integrity test, which is considered to be a minimum requirement.
Test methods developed in this International Standard do not cover the other in situ performance requirements, such as mechanical resistance, bursting resistance or humidity resistance. Specific systems operating at high temperature or with specific gaseous effluents might require specific test methods.
The engineering design of HEPA and ULPA filter installations does not fall within the scope of this International Standard.
Diese Norm ist für Nutzer von HEPA- und ULPA-Filtern anwendbar, die die Leistung dieser in ihren Anwendungen eingebauten Filter vor Ort steuern wollen, insbesondere in einigen technischen Bereichen, in denen die Aerosolfilter verwendet werden, um die Freisetzung in die Umwelt einzuschränken (z. B. nukleare Anlagen oder Anlagen, aus denen toxische Aerosole oder biologische Stoffe freigesetzt werden). Von dieser Norm ist die Anwendung ausgenommen, die bereits in ISO 14644-3 (Reinräume und zugehörige Reinraumbereiche - Teil 3: Prüfverfahren) behandelt wird.
Der Anwendungsbereich dieser Norm umfasst Einzelheiten des Verfahrens bzw. der Verfahren, die für die regelmäßige Prüfung von HEPA- und ULPA-Filtern angewendet werden müssen, welche in anspruchsvollen Anwendungen mit dem Ziel, die Umwelt zu schützen, verwendet werden, wie z. B. in der Atomwirtschaft. Das schließt Beispiele für die anwendbare und nicht anwendbare Verwendung von Filtern ein sowie die Festlegung des Prüfintervalls, des Aerosoltyps, der Aerosolmischung und der Messverfahren.