ISO 21904-1:2020

ISO 21904-1:2020 pdf free.Health and safety in welding and allied processes一Equipment for capture and separation of welding fume一General requirements.
6 Instructions for use
6.1 General
The manufacturer shall provide information regarding the optimum use of extraction devices in an instruction manual.
The manufacturer of a component such as the capture device or suction equipment shall give technical data at the interface to connect components intended to be used. Technical data include, for example, characteristic curves for flow rate and depression as well as dimensions.
The manufacturer shall state that any additional hoses or ducts can add pressure drop and shall be considered by the installation designer or the user.
The manufacturer shall provide information regarding the inspection of hoses for damages affecting the extraction efficiency.
The manufacturer shall inform the user if and how channelling of the exhaust air can be done.
NOTE 1 In some countries, recirculation of air to the work place atmosphere is discouraged or prohibited. Channelling of the exhaust air can be necessary.
The instructions for use shall cover every life phase of the equipment (from assembling to placing out of operation).
a) the instructions for use of welding fume separation equipment, which shall include the following information:
1) the intended use of the equipment;
2) usability for welding fumes containing CMR (carcinogenic mutagenic reprotoxic) substances, e.g. generated by welding high alloyed steels or welding consumables with more than 5 % (Cr, Ni);
3) usability only for welding fumes not containing CMR substances, e.g. TIG-welding of aluminium;
b) the meaning of indicators and warning signals;
c) the maintenance procedures, e.g. cleaning and changing of the filter, waste handling, changing of expendable parts;
d) the temperature and atmosphere conditions for operation and storage.
In case of unavoidable residual risks, there shall be information in the manual with advice on how to handle it, particularly regarding the handling of hazardous substances.
NOTE 2 There can be different requirements in national legislation for carcinogenic substances in the exhaust air (e.g. in some countries, it is not allowed to bring back the cleaned air into the workshop, other countries allow to bring back the cleaned air if the welding fume separation equipment is tested according to ISO 21904-2:2020 and marked W3).
NOTE 3 Reaching 100 % efficiency is not possible because that would extract the shielding gas and each single spark spattering away, has its own wisp of smoke. It may be necessary to use additional equipment like ventilation or personal protection to reduce the hazardous substances.
Conformity shall be checked by visual inspection.
6.2 Extraction devices
6.2.1 Captor hoods and nozzles
Effective operation of a captor hood depends primarily on its positioning towards the source/the process where welding fume is emitted, and its capture zone depending on the air velocity and the design of the capture device. In order to ensure adequate capture, the user needs information about the use of the device and its optimal positioning, e.g. a captor hood, should be diametrically positioned so that the welding fume is drawn away from the welders’ breathing zone. This shall be given by the manufacturer in the instruction manual e.g. by a drawing like Figure 5. Requirements on the technical performance of capturing devices are given in 5J. and 52.
Conformity shall be checked by visual inspection.ISO 21904-1 pdf download.

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