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Discuss Does it need purging? in the Gas Safe Register Forum - Public Forum area at

  1. fireman -Sam

    fireman -Sam New Member

    First off I'm not a gas engineer but a fire engineer. I've just had a bit of a problem on a job where the main incoming solenoid valve had been left off but the heaters on the site where then turned on or well where tried to be. They called in a Gas company who found the problem.
    But they are now saying that the hole system needs purging with nitrogen as there will be air in the system. Is this correct as I cant understand how air has got into the system? Surely the heaters/burners would just shut of if the pressure was to low and wouldn't let air into the system.

    Any advice would be appreciated thanks.
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    wont need purging with nitrogen unless they need to work on it

    but depending on volume yes it might need to be purged but not with nitrogen

    no they would try and fire till they locked out (eg fault)

    where are you located just for reference?
  3. fireman -Sam

    fireman -Sam New Member

    Thanks for the reply.
    That was my thoughts don't understand the nitrogen bit, I can understand the possible purging with gas bit and also pressure testing after.
    Its a big pipe around 12-18 inch and over 150+ meter long so will be a fair volume.
    Its around the Birmingham area.
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    yep air to gas purging unless there working on it doesnt matter on size they will have to be commercially gas safe to up1 spec

    whats it supplying just air heaters?
  5. fireman -Sam

    fireman -Sam New Member

    Yeah just air heaters all of which have a auto cut off from the fire alarm themselves sadly the main valve relay had a issue and remain closed.
    I will recommend to the customer to ask why the company are saying it needs purging with nitrogen and tell them to possibly get a second opinion. Thanks again.
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    yea best option if you dont mind me asking wheres the cutomer located / site location

    manchester ?
  7. fireman -Sam

    fireman -Sam New Member

    No I am based in the Manchester area but this site is in Coventry we look after a number of there sites most of which are in the north west area.
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Nice little patch

    Any other questions/ updates just post away :)
  9. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    The gas pipework will only need purging with nitrogen if work needs doing on the system ie decommissioning like changing the solenoid valve. If its a power failure and the heating was switched on then it will need testing and then air to gas purging and recommissioning. Cheers kop
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