ISO 16170:2016 pdf free download.In situ test methods for high efficiency filter systems in industrial facilities Méthodes d’essai in situ pour les systèmesfiltrants a très haute efficacité dans les installations industrielles. B.2 Test procedure considerations All internal upstream surfaces of the filter installation shall be subjected to an even, fully mixed (i.e. uniform) concentration of challenge aerosol. The extent to which this is achieved will determine the accuracy with which any aerosol leakage can be detected or measured. Extracted upstream aerosol samples shall be demonstrably representative of the aerosol particle concentration of the airflow. The extent to which this requirement shall be met depends on — accuracy required to meet the safety requirement for the plant or facility, and — inherent error in the measuring instruments, generation rate of the challenge, etc. Under ideal conditions (good mixing of the test aerosol, relative deviation of 10 % to the mean value), the filter penetration measured by a single test should be within 40 %. Non-ideal geometry likely to be encountered in real situations can result in considerably large errors unless appropriate countermeasures are adopted. A uniform concentration profile for the challenge aerosol is achieved by allowing an adequate mixing length between…