We are surprised how many businesses seem to overlook the dangers of using compressed gases and the fire and explosion risks that are associated. Of course the risks are significantly higher when highly flammable gases such as Propane and Acetylene are involved.
In fact the dangers posed by acetylene has lead the HSE to issue updated guidance http://www.hse.gov.uk/fireandexplosion/acetylene.htm
This identifies the importance of carrying out a thorough risk assessment and that suitable controls are put into place. As the HSE points out acetylene gas poses an additional hazard to other flammable gases as it is also reactive. Under certain conditions, even in the absence of any air or oxygen, it can decompose explosively into its constituent elements, carbon and hydrogen.
What employers overlook in our experience is that suitable controls need to include:
Storage – restricted access and separated from other gases; Transportation – means to prevent the kits falling over and the ability to remove the kits if a fire was to occur; Staff training – to ensure they know of the dangers and the importance of following safe working methods; Inspection of kit by competent persons – should be undertaken at least annually; Maintaining the kit in good working order – replace out of date regulators (they have a 5 year life span) and damaged/perished hoses.
As the HSE identifies it is recommended that acetylene gas is only used by those trained to use it using suitably designed handling equipment. Have your staff been trained to use and inspect the kit? Most employees we see clearly have not been as very obviously the kits lack care and attention.
It’s a fact that all pressurised cylinders regardless of their contents are at greatest risk of failure whilst being subject to direct-flame contact.
If a cylinder filled with compressed acetylene gas is exposed to a flashback, or is involved in a fire, its contents may have begun to decompose. This process can become self-sustaining causing the cylinder to explode, in some cases hours after the initiating event. These cylinders would pose a risk to anyone in their vicinity and the Fire and Rescue Service (FRS) must be called straight away.
It is highly likely that an area of 200 meters around the heated cylinder will be evacuated by the FRS and for acetylene this can remain in place for up to 24 hours. This often means your business, the businesses around you and even roads and railway lines would need to be cleared for a prolonged period.
If you’re not sure then please ask for expert advice as compressed gases can be dangerous and need to be handled with care.
