Health and safety in welding and allied processes. Equipment for capture and separation of welding fume - Determination of the minimum air volume flow rate of capture devices

Health and safety in welding and allied processes. Equipment for capture and separation of welding fume - Determination of the minimum air volume flow rate of capture devices

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What is ISO 21904-4 about? 

ISO 21904-4 is an international standard series that covers the health and safety in welding and allied processes.  

ISO 21904-4 is the fourth part of a multi-series standard that 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 to using on-gun extraction devices. 

Note: These methods provided by ISO 21904-4 are not applicable to down draught tables. 

Who is ISO 21904-4 for? 

ISO 21904-4 on health and safety in welding processes is applicable to: 

  • Machine manufacturers (small, medium, and large organizations) 
  • Health and safety bodies (regulators, accident prevention organizations, market surveillance, etc.) 
  • Machine users/employers (small, medium, and large organizations) 
  • Machine users/employees (e. g. trade unions, organizations for people with special needs) 
  • Service providers, e. g. for maintenance (small, medium, and large organizations) 

Why should you use ISO 21904-4? 

In the fabrication industry, it is important to control exposure to welding fume. For a particular capture device, the air velocity to capture welding fume can only be achieved by applying a minimum air volume flow rate. The capture devices need to be used with exhaust systems that provide, at least, the minimum air volume flow rate. 

ISO 21904-4 provides you guidelines and methods of control to capture the fumes and gases close to their source before they enter a worker’s breathing zone. It is important that welding equipment has high separation efficiency so that as little fume as possible is recirculated or exhausted.  

ISO 21904-4 gives you two options for determining the minimum air volume flow rate which helps you provide a suction field of given dimensions and air velocity at a measured distance perpendicular to the entry plane of the hood. This could help you in improving the efficiency of the welding process thus, contributing to health and safety in welding and allied processes.