+ Reply to Thread
Page 2 of 2 FirstFirst 1 2
Results 11 to 16 of 16

Thread: Oxygen cleaning

  1. #11
    Human Fuktup Engineering dave-diving is on a distinguished road dave-diving is on a distinguished road dave-diving's Avatar
    Join Date
    May 2005
    Location
    Britain....Cornwall
    Posts
    41

    Re: Oxygen cleaning

    As I am the person who wrote the recommendation for SITA it might be worth giving a little background as to why 15 months as a maximum was chosen.

    The cycle of visual and hydraulic test to a cylinder is 30 and 60 months. The yearly visual is out of line with that and increases the need to open a pressure vessel twice more than the new recommendation. There are very few recorded issues regarding oxygen problems with cylinders it was felt that given the cost of strip and clean opposed to the very low frequency of problem moving to 15 months maximum was logical.

    This was written then peer reviewed by Mike Harwood (now retired) of HSE and Mike Todd of IDEST.

    The specific extract is below….

    Where oxygen cleaning is mandatory, it is strongly suggested that it be performed on an annual basis or where it can fit into a regular service pattern of cylinder examination. This will prevent the insidious buildup of contaminants over a long period of time. The periods utilized must be viewed in all cases as absolute maximum.

    What is the minimum standard for when oxygen cleaning is required? NOAA, OSHA, and some technical and Nitrox training certification agencies have agreed that if the oxygen content of the breathing mixture entering the cylinder is 40% or less all scuba equipment may be used without the necessity of oxygen cleaning. However, manufacturer’s specifications and guidelines supersede this minimum standard and must be fully adhered to by the Oxygen Service Technician. If at any point, such as may be the case in partial pressure blending, oxygen is introduced into the system or a cylinder, then it must be oxygen cleaned and have oxygen compatible components. SITA strongly suggests that any scuba system or component used with oxygen percentages greater than 21% be oxygen cleaned in accordance with UK regulation.


    Any filling station has the RIGHT to ask to open your cylinder prior to filling if they have grounds to believe it is contaminated, just as you have the right to refuse but you will not get a fill. It is the cylinder filler who places themselves at risk and the company who has to mitigate the risk with their own codes of practise, not the cylinder owner. SITA published the document to offer guidance to the filling station and technicians.

    Please take heed of this and ensure you treat all elevated oxygen (22% and up) as oxygen clean as you might be the one putting someone else at risk. This is very pertinent with smaller re-breather cylinders where there is greater likelihood of ending up with an empty and partially flooded cylinder.

    There was nothing in Eu. Standards that actually state you MUST clean your cylinder at a given interval at the time of release, but people across Europe are working on that.

    Dave

  2. #12
    In search of Law breaking Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw is a glorious beacon of light Outlaw's Avatar
    Join Date
    Aug 2006
    Location
    Cyprus, Nicosia
    Posts
    1,455
    Meggy Meg...

    Got the best one from day 1...

    Re: Oxygen cleaning

    Quote Originally Posted by EBT  View Original Post
    all very interesting guys, but he didnt ask you to teach him to suck eggs, he asked about the uk "regulations".
    :D:D:D

  3. #13
    Tim Owens netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage has much to be proud of netmage's Avatar
    Join Date
    Dec 2005
    Location
    Coral Springs, FL
    Posts
    1,450

    Re: Oxygen cleaning

    Quote Originally Posted by EBT  View Original Post
    all very interesting guys, but he didnt ask you to teach him to suck eggs, he asked about the uk "regulations".
    Just for the record, might I suggest the film "Cool Hand Luke"....

  4. #14
    Steve C UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve is a splendid one to behold UKSteve's Avatar
    Join Date
    Jul 2005
    Location
    Weymouth, UK
    Posts
    642

    Re: Oxygen cleaning

    Just had a "discussion" with LDS.. who claim that they have not received anything official from SITA about the move to a 15 month interval. Having just put in 8 cylinders for a range of Hydro / visual / O2 cleaning I wonder if there is anything official in the public domain?

    Or could someone send me or post a copy of the new SITA recommendations?

    Cheers

    Steve

  5. #15
    RBW Member gwilson is an unknown quantity at this point gwilson's Avatar
    Join Date
    Nov 2007
    Location
    Glasgow ish
    Posts
    75

    Re: Oxygen cleaning

    Quote Originally Posted by UKSteve  View Original Post
    Just had a "discussion" with LDS.. who claim that they have not received anything official from SITA about the move to a 15 month interval. Having just put in 8 cylinders for a range of Hydro / visual / O2 cleaning I wonder if there is anything official in the public domain?

    Or could someone send me or post a copy of the new SITA recommendations?

    Cheers

    Steve
    I've had a similar conversation with the LDS I use, they are aware of the 15 month interval but are keeping it at 12 months for the time being. This is better than the other LDS that refuses to fill any o2 clean cylinder if they have not done the cleaning themselves.

  6. #16
    Duvet Diver Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A is a glorious beacon of light Simon A's Avatar
    Join Date
    Feb 2005
    Location
    Reading, UK
    Posts
    917

    Re: Oxygen cleaning

    Seeing as how this one seems to crop up every now and then
    Here's all the info for UK O2 cleaning including which IDEST buletin it's in and where:-

    SITA/IDEST

    Date of circulation 05.09.2007
    Page 21
    8:1
    Paragraph 5

    In the case of properly maintained cylinders where oxygen service
    has been maintained the frequency of cleaning shall fit with the
    cycle of visual and hydraulic inspections carried out on the cylinder.
    The acceptable maximum timeframe between cleaning for oxygen
    service is 15 calendar months.

    Hope that helps.
    If you need any further clarification Pat at Scuba Industries Trade Association is very helpfull.

    HTH
    Simon A

+ Reply to Thread
Page 2 of 2 FirstFirst 1 2

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts