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ISO FDIS 16170 2016 Edition, February 4, 2016 IN SITU TEST METHODS FOR VERY HIGH EFFICIENCY FILTER SYSTEMS IN INDUSTRIAL FACILITIES
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Description / Abstract:
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 to be 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.
NOTE In the field of filters for general ventilation
applications, ISO 29462 is a detailed and comprehensive description
of a method which uses scanning and particle counting methods to
evaluate the performance of a filter in terms of particle grade
efficiency, as well as pressure drop. Such a method and procedure
would not be applicable in those nuclear installations where
quantification of the decontamination factor at MPPS size is
needed