For other substances which have a WEL but are not carcinogens or can cause asthma, adequate control of exposure will involve controlling exposure to below the WEL.Īny revised WEL, which might be implemented, will require improved fume control measures for many welding processes.Potentially explosive atmospheres exist in locations where work activities create or release flammable gases or vapours, such as petrochemicals, VOCs from paint spraying, or in workplaces handling fine organic dusts such as grain flour or wood.Īpplications for this new intrinsically safe personal dust monitor therefore include a wide variety of workplaces within the oil and gas, petrochemical, manufacturing, processing, aerospace, and bulk material handling sectors, as well as those with confined spaces such as mining and wastewater.Įmployers are responsible for the classification into zones of areas where hazardous explosive atmospheres may occur. This means that there is a requirement to reduce exposure to these constituents to a concentration which is as low as is reasonably practicable (ALARP). Hexavalent chromium and nickel in welding fume are both defined occupational carcinogens. Therefore, exposure measurements should be compared to the appropriate limits for the different constituents in the welding fume, such as: iron oxide, hexavalent chromium, nickel and manganese. Personal air monitoring results can be compared with the relevant set workplace exposure limits (WELs) which are published in the HSE book EH40/2005: Workplace Exposure Limits In-house limits can also be set and used to compare with results for task-specific exposures. These things will influence the personal results of the survey for exposure to welding fume. The investigation will also need to look at other factors that can influence exposure on the day, such as the production rate setting the amount of welding work needed. The results will then influence the assessment of how well control measures for the welding fume are working. Under the Control of Substances Hazardous to Health (COSHH) system, an initial exploratory exposure monitoring exercise may be needed to reach an accurate judgement about the risk to health. Monitoring may also be needed to help confirm that the control measures in use are working correctly, as a deterioration or failure of engineering controls could result in welders being exposed to high levels of fume. Personal breathing zone monitoring manual#during the manual metal arc (MMA) welding of stainless steel. Air monitoring and measurement may be needed where there is a serious risk to health from the inhalation of welding fume and the likely exposure level of the welders to the fume is not known, e.g.
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