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    Hyrogen generated from use of incinerator bottom ash suspected

    Barhale has issued a Safety Alert concerning the use of foam concrete containing incinerator bottom ash (IBA) on their projects following an explosion. 

    The alert suggests the foam concrete was placed into a dry well extending beneath a metal floor. It is believed that hydrogen generated built up beneath the floor and that the gas/air mixture was ignited by sparks from a grinder used the following morning.

    HSE is investigating the incident.

    Comment: This short video gives a good account of foam concrete.

    First principles suggest that where hyrogen can be generated from a product the user assessment should consider: (a) avoiding the risk by subsitution with non-hydrogen generating substances (b) avoiding confined spaces (c) effective ventilation and (d) avoidance of work producing ignition sources, unless the area has been certified gas free.

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    1. CONCRETE EXPLOSION HSE POSITION | PP Construction Safety News Desk Says:

      […] The explosion in August 2009 injured two workmen after a pit had been filled with foamed concrete. Whilst the concrete was setting work started with angle grinders and the explosion occurred. […]