Ask Your Mates Open Forum

Valve Inspection Frequency

  • 1.  Valve Inspection Frequency

    Posted 18 March 2019 20:22
    ​At Coffs Harbour City Council we are evaluating our levels of service and have a question about the industry practice for the inspection of water and sewer valves (excluding treatment plants).  What is your current practice?  Never, once per year, once every 5 years, etc.  Your input will be appreciated.

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    Alison Ratliff, Asset Strategist - Sewer/Water
    02 6648 4423 (o)
    alison.ratliff@chcc.nsw.gov.au
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  • 2.  RE: Valve Inspection Frequency

    Posted 29 days ago
    Good afternoon Alison

    It will depend on the risk associated with each valve, and the ease it can be examined - although in most cases that's probably not needed. In my experience a better option is to have a program to fully operate each valve regularly to ensure that it will work when you need it. Older water main valves (say >30 years) that didn't have resilient seats may not seat properly, so this should be part of your test.

    FYI - Melbourne Water did have an issue about 20 years ago with a particular valve where the clip holding the spindle in place failed and the spindle rapidly shot up about 300mm. Not good for the person operating it...

    Regards

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    Ricky Luke
    Asset Management Coordinator
    Glenelg Shire Council
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  • 3.  RE: Valve Inspection Frequency

    Posted 29 days ago
    ​Hi Alison,

    Here at Charleston Water System we abide by the South Carolina Department of Health and Environmental Control (SCDHEC) guidelines. Those guidelines are for potable water systems and require mapping of all of the valves, a risk based valve exercising plan, an exercising frequency of every 3 years for distribution mains (<400mm), and every year for transmission mains (>400mm).

    The sewer is not as stringent but since there are typically far fewer valves on force mains (sewer rising mains) systems it makes since to simply replicate the same frequency for those valves. That's just my opinion though.

    We are currently in the process of developing a documented valve exercising work program to replace our traditionally ad-hoc approach. It sounds like Coffs may be doing something similar. I would be very interested to hear about your progress and experience (contact info is below if you are interested in discussing).

    Please tell the Coffs Harbour big banana I say hello.

    Regards,

    Earl DuPriest

    Asset Management Program Manager
    Charleston Water System
    103 St. Philip Street | Charleston, SC 29403
    Tel: 843-727-7202
    Mob: 843-214-4310
    E: dupriester@charlestoncpw.com




  • 4.  RE: Valve Inspection Frequency

    Posted 29 days ago
    Hi Alison,

    To determine frequencies of valve inspection / condition assessment, it would be great to have criticality information on each valve.
    Normally the criticality of valves follows the criticality of mains where they are installed on.

    In Waipa District Council, we carry out a valve inspection / condition assessment once every year for high criticality valves and once every 5 years for the rest of valves.

    Thanks

    Joong Lee
    Waipa District Council