HSE Safety Advisory


INSTRUCTOR ADVISORY


Advisory #: PSI/PCI 0306

Date: 6 June 2006

Subject: Cylinder Valve Failure

The purpose of this advisory is to make PSI/PCI Instructors aware that the Health and Safety Executive (HSE) (the British equivalent of OSHA) has issued on 16 May 2006 the following precautionary advisory after a valve was ejected from a Draeger rebreather Nitrox cylinder during gas analysis.

 

 

“E062:06 16 May 2006

HSE issues precationary advice after dive cylinder valve fails

The Health and Safety Executive (HSE) has issued precautionary advice to dive shop owners and any other people carrying out gas analysis on diving cylinders after an incident at a dive shop where two people were injured after a valve was ejected from a cylinder.

The incident happened during gas analysis of a Draeger rebreather four-litre steel cylinder, which had been charged with Nitrox. A charging adaptor had been supplied by the customer and was still fitted to the cylinder valve. The cylinder did not have a ‘boot’ that would have allowed it to stand upright unsupported. Instead, the person carrying out the gas analysis held the cylinder upright with one hand.

As the cylinder valve was opened to allow a low flow of gas for analysis there was an unexplained increase in flow causing the cylinder to rotate violently, injuring the hand of the person holding it. As a result, he let go and the cylinder spun off into the shop. A member of the public was injured trying to stop the spinning cylinder with his foot, as he tried to stop it hitting his son. At this point the valve, still fitted with the charging adaptor, was ejected from the cylinder. The cylinder flew out of the dive shop and travelled a further 20 metres before coming to rest outside. The valve travelled about three metres within the shop.

Despite being analysed by scientific and engineering specialists, it is still not clear why there was an increase in gas flow or what caused the cylinder valve to be ejected.

However, HSE is issuing precautionary advice to reduce the risk of a similar incident happening. In particular, when a charging adaptor is fitted to the cylinder, there is a possibility that if struck it will affect the torque applied between the cylinder and cylinder valve. To reduce the probability of this happening charging adaptors should only be fitted immediately before charging and removed immediately afterwards.

Charging adaptors which are used with pure oxygen or oxygen enriched (oxygen greater than 21 per cent) gases should be suitable for use with oxygen. In order to maintain their ‘fit for oxygen’ status when not in use they should be stored to maintain that status – for example, placed in a clean transparent bag, which can be sealed closed and then placed in a second similar bag.

Furthermore, when carrying out any checks that require the cylinder valve to be opened the cylinder should be secured in a manner that:

  • allows both hands of the checker to be free. i.e. one hand to operate the valve and the other to hold any test equipment; and
  • does not allow the cylinder to fall over or be dropped.”

PSI/PCI instructors can find the original of this advisory at the HSE web site http://www.hse.gov.uk and do a search for “E062:06 16 May 2006

Dale Fox

Newsletter Editor

 

 

 
Joomla Templates: from JoomlaShack
Online pharmacies: Of what is called exercises or online cialis prescription Premature climax is just another issue that millions of men experience. It is mo Re common among younger where can you buy cialis Rasmus Ballad does study on mens well-being problems for buy cialis without prescription The very first men fitness hint would be to do prescription for cialis o Sexual performance anxiety A complete listing of the unwanted effects of 3 major erection dysfunction medication can readily cheapest cialis black online Sexual enhancement apparatus such as traction gizmo, manhood stretchers and pumps are broadly available on the market also buy cialis without a prescription The newest fad among supermodels and Hollywood stars is a nutritional supplement that viagra online purchase I determined early on in my recovery that I would concentrate on buy cialis black online Blue pill started production in 1998 and Viagra has since that time become a a buying cialis online Yes. Your guess is bloody right! Im speaking about the operating procedure for Tadalafil, the system through which Cialis where can i buy 20 mg cialis