ISO 16170:2016 産業施設における高効率フィルターシステムの現場試験方法 | ページ 6

3.1

aerosol

system of solid or liquid particles suspended in gas

Note 1 to entry: In general, one divides the atmospheric aerosol into three size categories: the ultrafine range x ≤ 0,1 μm, the fine range 0,1 μm < x ≤ 1 μm, and the coarse range x > 1 μm, where x is the particle diameter.

[SOURCE: ISO 29464:2011, 3.1.1]

3.1.1

monodisperse aerosol

aerosol (3.1) , the width of whose distribution function, described by the geometric standard deviation σ_g, is less than 1,15 μm

[SOURCE: ISO 29464:2011, 3.1.2]

3.1.2

polydisperse aerosol

aerosol (3.1) , the width of whose distribution function, described by the geometric standard deviation σ_g, exceeds 1,5 μm

[SOURCE: ISO 29464:2011, 3.1.3]

3.1.3

quasi-monodisperse aerosol

aerosol (3.1) , the width of whose distribution function, described by the geometric standard deviation σ_g, is between 1,15 μm and 1,5 μm

[SOURCE: ISO 29464:2011, 3.1.4]

3.1.4

test aerosol

aerosol (3.1) used for determining filter efficiency

3.2

decontamination factor

ratio between the concentration or particles number upstream the filter and the concentration or particles number contamination downstream the filter

Note 1 to entry: This ratio is also defined by 1/(1- overall efficiency (3.13) ).

3.3

effective filter media area

area of the media contained in the filter (without adhesive spaces or ligament) and passed by air during operation

[SOURCE: ISO 29464:2011, 3.1.11]

3.4

efficiency

E

fraction of contaminant entering the filter which is retained

[SOURCE: ISO 29464:2011, 3.1.55]

3.5

efficiency accountancy test

in-situ test procedure meeting a requirement for an accurate system overall efficiency (3.13) determination at MPPS (3.11)

3.6

integrity test

in-situ test procedure meeting the requirement for confirming the absence of unfiltered leakage of the system

3.7

filter element

filtering material in a preformed shape being a part of a complete filter

[SOURCE: ISO 29464:2011, 3.1.67]

3.8

filter face area

frontal face area of the filter including the header frame

[SOURCE: ISO 29464:2011, 3.1.83]

3.9

HEPA filter

filter with performance complying with requirements of filter class ISO 35 – ISO 45 as per ISO 29463-1

[SOURCE: ISO 29464:2011, 3.1.88]

3.10

filter medium

material used for filtering

[SOURCE: ISO 29464:2011, 3.1.90]

3.11

most penetrating particle size

MPPS

particle size at which the minimum of the particle size efficiency (3.14) curve occurs under test conditions

Note 1 to entry: This MPPS is media and ventilation conditions dependent. This MPPS is in the 0,1 µm to 0,2 µm medium aerodynamic size range for fibreglass type filters commonly used in nuclear applications.

[SOURCE: ISO 29464:2011, 3.1.129]

3.12

user nominal air volume flow rate

q_v,nom

air volume flow rate specified by the user, at which the filter element (3.7) is tested in situ

Note 1 to entry: This flow rate may be different from the one specified by the manufacturer.

3.13

overall efficiency

efficiency averaged over the whole superficial face area (3.15) of a filter element (3.7) under given operating conditions of the filter

Note 1 to entry: It is expressed in percentage (%).

3.14

particle size efficiency

efficiency for a specific particle diameter

Note 1 to entry: The efficiency plotted as a function of the particle diameter gives the fractional efficiency curve.

Note 2 to entry: It is expressed in percentage (%).

3.15

superficial face area

cross-sectional area of the filter element (3.7) through which the air flow passes

3.16

ULPA filter

filters with performance complying with requirements of filter class ISO 55 – ISO 75 as per ISO 29463-1

[SOURCE: ISO 29464:2011, 3.1.100]

3.17

user nominal filter medium face velocity

nominal air volume flow rate divided by the effective filter medium (3.10) area