NF EN ISO 29461-1
Air intake filter systems for rotary machinery - Test methods - Part 1 : static filter elements
ISO 29461 specifies methods and procedures for determining the performance of particulate air filters used in air intake filter systems for rotary machinery such as stationary gas turbines, compressors and other stationary internal combustion engines. It applies to air filters having an initial particle efficiency up to 99,9 % with respect to 0,4 µm particles. Filters with higher initial particle efficiencies are tested and classified according to other standards (e.g. EN 1822). These procedures are intended for filters which operating at flow rates within the range 0,25 m3/s (900 m3/h) up to 1,67 m3/s (6000 m3/h). ISO 29461-1:2013 refers to static (barrier) filter systems but can be applied to other filter types and systems in appropriate circumstances. Two methods of determining the efficiency are used in ISO 29461-1:2013: particulate efficiency (measured with respect to particle number and size); gravimetric efficiency (percentage weighted mass removal of loading dust. Also a flat sheet media sample or media pack sample from an identical filter is conditioned (discharged) to provide information about the intensity of the electrostatic removal mechanism. After determination of its initial particle efficiency, the untreated filter is loaded with dust in steps until its final test pressure drop is reached. Information on the loaded performance of the filter is then obtained. The performance results obtained in accordance with ISO 29461-1:2013 cannot be quantitatively applied (by themselves) to predict performance in service with regard to efficiency and lifetime. Other factors influencing performance to be taken into account are described in the annexes.
ISO 29461 specifies methods and procedures for determining the performance of particulate air filters used in air intake filter systems for rotary machinery such as stationary gas turbines, compressors and other stationary internal combustion engines. It applies to air filters having an initial particle efficiency up to 99,9 % with respect to 0,4 µm particles. Filters with higher initial particle efficiencies are tested and classified according to other standards (e.g. EN 1822). These procedures are intended for filters which operating at flow rates within the range 0,25 m3/s (900 m3/h) up to 1,67 m3/s (6000 m3/h).
ISO 29461-1:2013 refers to static (barrier) filter systems but can be applied to other filter types and systems in appropriate circumstances.
Two methods of determining the efficiency are used in ISO 29461-1:2013:
- particulate efficiency (measured with respect to particle number and size);
- gravimetric efficiency (percentage weighted mass removal of loading dust.
Also a flat sheet media sample or media pack sample from an identical filter is conditioned (discharged) to provide information about the intensity of the electrostatic removal mechanism.
After determination of its initial particle efficiency, the untreated filter is loaded with dust in steps until its final test pressure drop is reached. Information on the loaded performance of the filter is then obtained.
The performance results obtained in accordance with ISO 29461-1:2013 cannot be quantitatively applied (by themselves) to predict performance in service with regard to efficiency and lifetime. Other factors influencing performance to be taken into account are described in the annexes.
<p>This document specifies methods and procedures for determining the static performance of particulate air filters used in air intake filter systems for rotary machinery such as stationary gas turbines, compressors and other stationary internal combustion engines. It applies to air filters with an efficiency of 85 % or more for the MPPS (EPA and HEPA filters) which are tested according to ISO 29463 (all parts) and filters with a lower efficiency which are tested according to ISO 16890 (all parts). The procedures described in both ISO 16890 (all parts) and ISO 29463 (all parts) are applied and extended by this document to air filters which operate at flow rates within the range 0,24 m<sup>3</sup>/s (850 m<sup>3</sup>/h) up to 2,36 m<sup>3</sup>/s (8 500 m<sup>3</sup>/h).</p> <p>Static filter systems normally use multiple stages of coarse, fine and optional EPA or HEPA filter elements to protect the machinery. The scope of this document includes methods for performance testing of individual filter elements. It does not include methods for the direct measurement of the performance of entire systems as installed in service except in cases where they can meet the qualification criteria for the test assembly. Nevertheless, cumulative filter efficiencies of multistage systems of fine filters can be calculated by using the methods described in ISO 16890-1.</p> <p>This document refers to static (barrier) filter systems but can also be applied to other filter types and systems in appropriate circumstances, for example to evaluate the initial efficiency of cleanable and surface loading filters.</p> <p>The performance results obtained in accordance with this document cannot be quantitatively applied (by themselves) to predict performance in service with regard to efficiency and lifetime.</p>
- Avant-proposv
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0 Introductionvi
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1 Domaine d'application1
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2 Références normatives1
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3 Termes et définitions2
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3.2 Vitesse2
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3.3 Efficacité2
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3.5 Perte de charge (pression différentielle)3
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3.6 Surface du filtre3
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3.7 Filtres3
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3.8 Aérosol d'essai4
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3.9 Poussière d'essai5
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3.10 Prélèvement des particules5
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3.11 Relargage de particules5
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4 Symboles et abréviations6
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5 Exigences générales8
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6 Equipement et banc d'essai8
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6.1 Conditions d'essai8
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6.2 Banc d'essai8
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6.3 Génération de l'aérosol d'essai de DEHS12
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6.4 Système de prélèvement d'aérosol13
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6.5 Mesurage du débit14
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6.6 Compteur de particules14
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6.7 Équipement de mesure de pression différentielle15
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6.8 Générateur de poussière15
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6.9 Equipement de dilution17
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7 Qualification de l'appareillage et du banc d'essai18
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7.1 Généralités18
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7.2 Uniformité de la vitesse de l'air dans le conduit d'essai18
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7.3 Uniformité de l'aérosol dans le conduit d'essai19
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7.4 Précision de calibrage du compteur de particules20
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7.5 Essai à zéro du compteur de particules20
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7.6 Essai de surcharge du compteur de particules20
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7.7 Essai d'efficacité à 100%21
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7.8 Essai d'efficacité à zéro%21
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7.9 Temps de réponse du générateur d'aérosol21
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7.10 Rapport de dilution22
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7.11 Rapport de corrélation22
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7.12 Vérification de la perte de charge23
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7.13 Débit d'air du générateur de poussière23
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7.14 Vérification du filtre de référence24
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7.15 Récapitulatif des exigences de qualification25
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7.16 Maintenance de l'appareillage26
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8 Matériaux d'essai26
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8.1 Air d'essai26
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8.2 Aérosol d'essai27
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8.3 Poussière de chargement27
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8.4 Filtre final28
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9 Mode opératoire d'essai28
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9.1 Préparation du filtre soumis à essai28
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9.2 Perte de charge initiale28
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9.3 Mesurage de l'efficacité initiale29
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9.4 Essai de conditionnement32
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9.5 Chargement de poussière33
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10 Calcul de l'incertitude des résultats d'essai35
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10.1 Efficacité particulaire pour filtres à efficacité moyenne (efficacité initiale: 35 < ou = E < ou = 85% à 0,4 micromètres)35
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10.2 Efficacité particulaire pour filtres à haute efficacité (efficacité initiale
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10.3 Efficacité gravimétrique37
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11 Rapport d'essai37
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11.1 Généralités37
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11.2 Interprétation des rapports d'essai38
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11.3 Récapitulatif39
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11.4 Efficacité40
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11.5 Perte de charge et débit d'air40
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11.6 Marquage41
- Annexe A (normative) Mode opératoire d'essai de conditionnement48
- Annexe B (informative) Relargage par les éléments filtrants53
- Annexe C (informative) Commentaires55
- Annexe D (normative) Calcul de la perte de charge59
- Annexe E (normative) Calcul de la surface nette61
- Bibliographie69
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