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sklademVydáno: 2020-05-27
UNE EN ISO 21904-4:2020
Health and safety in welding and allied processes - Equipment for capture and separation of welding fume - Part 4: Determination of the minimum air volume flow rate of capture devices (ISO 21904-4:2020)
Seguridad e higiene en el soldeo y procesos afines. Equipo para la captura y filtración de humo de soldeo. Parte 4: Determinación del caudal volumétrico mínimo de los dispositivos de captura. (ISO 21904-4:2020).
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| Označení normy: | UNE EN ISO 21904-4:2020 |
| Počet stran: | 19 |
| Vydáno: | 2020-05-27 |
| Status: | Norma |
DESCRIPTION
UNE EN ISO 21904-4:2020
This part of ISO 21904 specifies two methods for establishing the minimum air volume flow rate. One method is dedicated for use with captor hoods, nozzles and slot nozzles with a ratio of slot length to hose diameter of 8:1 or less. The other method is dedicated for use with on-gun extraction devices. Neither method is applicable to down draught tables.
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