Ask Your Mates Open Forum

Condition Assessment for Water Mains and Appurtenances

  • 1.  Condition Assessment for Water Mains and Appurtenances

    Posted 25 days ago

    Good day

    Is anyone aware of a consistent condition scoring system for water mains similar to the WRc scoring you see with storm and sanitary mains?

    As well, is anyone aware of a consistent scoring system for chambers/valves/ etc...preferably one that provides picture examples.

    BlogPageSpacerBlank


  • 2.  RE: Condition Assessment for Water Mains and Appurtenances

    Posted 25 days ago

    Hi Lucas,

    I would have hoped WSAA would have progressed on this document:

    Condition Assessment Guidelines Stage 1 & 2 for Pressure Mains
    https://www.wsaa.asn.au/sites/default/files/publication/download/PPS1%20Condition%20Assessment%20Guidelines%20Stage%201%20and%202.pdf

    If starting a system might be an idea to have look at failure modes of pipe from:
    https://www.wsaa.asn.au/sites/default/files/codes/downloads/Failure%20Mode%20Table%202012%20V8_0.pdf

    WSAA has a Condition Assessment Guidelines for Mechanical and Electrical Assets that uses a 1-5 where 1 is Good and 5 is imminent failure. Criteria and valves are included in Condition Assessment Guidelines but not concrete structures.

    Hope the above info helps:

    Ian Lee - Reliability / Maintenance Engineer
    www.covaris.com.au
    i.lee@covaris.com.au
    +61 457 657 057


     


    BlogPageSpacerBlank


  • 3.  RE: Condition Assessment for Water Mains and Appurtenances

    Posted 24 days ago
    Also, I have been searching the website...do you know where i can find this

    WSAA has a Condition Assessment Guidelines for Mechanical and Electrical Assets
    BlogPageSpacerBlank


  • 4.  RE: Condition Assessment for Water Mains and Appurtenances

    Posted 23 days ago
    Hi Lucas,

    The Kiwis have a pretty good guide for condition grading of pressurized mains (including a data confidence scale which is rather important). We are adopting it as a framework for developing more detailed guidelines for our field staff and contractors to grade condition. I have attached their guidelines to this post for your reference.

    An important concept to understand with condition is that there are various levels of condition assessment based on confidence in the scoring. An example is provided below for reference
    Level 1​ Condition Assessment: Physical assessment at a specific location supported by reliable data and or photos gathered on site. A UT test, or physical sample removal/analysis or similar would be a good example.

    Level 2 Condition Assessment: An inference of condition, such as a Monte Carlo statistical analysis, from the results of a Level 1 assessment.  This could also relate to a broadbrush inline assessments results such as Smartball.

    Level 3 Condition Assessment: This one is purely theoretical based on the best information at hand and a desk top analysis. useful life,  age, environment (i.e., Conductive soils, high groundwater, etc.), failure history, O&M costs, customer complaints, etc.   All of these would be viable asset attributes that  contribute to condition.

    Level 4 Condition Assessment: This one is also purely theoretical but is far less informed than Level 3. Considerate only of the manufacturer specified useful life and the age of the main. Every main in your asset register should at a minimum have this information available.

    The above is just an example but the concept is quite important when considering the creation of a condition grading standard.

    I hope all of this information is helpful for you.

    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


    BlogPageSpacerBlank


  • 5.  RE: Condition Assessment for Water Mains and Appurtenances

    Posted 22 days ago
    Thanks for this Earl, truly appreciate it
    BlogPageSpacerBlank


  • 6.  RE: Condition Assessment for Water Mains and Appurtenances

    Posted 8 days ago
    Hi Lucus, sorry for not responding earlier as I have been on a family holiday for the last 2 weeks.
    As it a "Condition Assessment Guidelines for Mechanical and Electrical Assets" is WSAA Document, it not my IP share in an open forum.

    Regards,

    Ian Lee - Reliability / Maintenance Engineer
    www.covaris.com.au
    i.lee@covaris.com.au
    +61 457 657 057

    BlogPageSpacerBlank


  • 7.  RE: Condition Assessment for Water Mains and Appurtenances

    Posted 24 days ago
    Thanks for the links Ian

    Truly appreciate it
    BlogPageSpacerBlank