Testing of Breathing Gas

Many people will have seen the recent unfortunate incident where a number of school children have been hospitalised after a diving lesson and the subsequent urgent message from the HSE regarding breathing gas from Aqualogistics in Stockport.

The Diving Standards Team wish all service divers to be reminded about the importance of testing breathing gas in accordance with the standards in JSP319 and BRd2806(5).  Specifically the following should be complied with:

  • All breathing gas requires an annual laboratory test at a UKAS accredited lab to BS EN12021:2014.
  • Three monthly tests are also required to comply with¬† HSE DVIS No.9 (Rev. 1)
  • Non-service compressors need a before use test using the Factair F2235
  • Expeds and Branches should also remain vigilant and if any compressor maintenance is observed or divers report feeling ‘unwell’ then CNBA should be re-tested to confirm the quality of the gas before the start of any dive evolution

Recent expeds have also highlighted the following items in their PXRs which may help with transporting and using the Factair F2235:

  • Transport the FACTAIR F2235 as hand luggage and NOT hold luggage.
  • Print off a copy of the FACTAIR F2235 operating instructions from the FACTAIR website in case you are challenged on what the kit does
  • If you are transporting the FACTAIR F2235 through a ‘FRAGILE’ country and you feel the equipment might be challenged have the ‘purpose of the FACTAIR’ translated into the local language to ease security clearance.
  • When ‘testing’ CNBA in countries with high humidity remember to run the compressor for longer or have the owners change the filters if you are struggling to meet the ‘water content’ of the BS EN12021:2014.
  • Order enough DRAGER sampling tubes which are ‘in-date’ and keep them in a refrigerator if in hot climates.
  • The purpose of the 5 minute ‘run through’ at 2 bar prior to the test is to ensure all moisture has been removed.
  • You have more tolerance on ‘water vapour’ at a lower cylinder pressure (<200 bar 50mg/m3 or >200 bar 35mg/m3)

More information on gas testing is contained in BRd 2806(5) and Annex K has details of the Factair F2235