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Failure History

Hi

What is difference between 'Duration of Pipe Failure History' and 'Duration of Pipe Group Failure History' in Pipe Break program? (In fact I do not know what 'Pipe Group' is here exactly. Please explain it more that Help). 

Thanx

  • A pipe group is created either by a selection set or by individually selecting pipes from the model. Pipes in a group should have similar properties with respect to pipe breakage such as age, material, laying condition, loading and period of break records. There is a help section on pipe break groups call "Pipe Break Group Dialog Box".

    Duration of Pipe Group Failure History would be based on the Pipe Groups is you had selected groups. Otherwise, you would be looking at the Duration of Pipe Failure History.

    Terry Foster
    Technical Support
    Hydraulics and Hydrology product line
    Bentley Systems, Inc.


  • Here is a support solution that you may find helpful on Break Analysis:  communities.bentley.com/.../running-pipe-break-analysis

    Terry Foster
    Technical Support
    Hydraulics and Hydrology product line
    Bentley Systems, Inc.


  • Dear
    Let me sort my questions:

    1- What does 'Duration' mean here? If 'Number of Breaks' for a Pipe be 3, and 'Duration of Pipe Failure History' be 2, then it means this Pipe fails 3 times in 2 years?
    2- If 'Number of Breaks' for a Pipe Group be 5, and 'Duration of Pipe Group Failure History' be 4, then it means this the pipes of the Pipe Group fails 5 times in 4 years?
    3- If answers of two above are YES, then what does it mean if 'Number of Breaks' for a Pipe be 1, and 'Duration of Pipe Failure History' for that Pipe be 4, AND a Pipe Group (which consists this Pipe) has 'Number of Breaks' equal 5 and 'Duration of Pipe Group Failure History' equal 2. What will it mean then?

    By the way, the numbers which were used above are not actual and just for example.

    Thanx for your attention.
  • The probability of a pipe breaking can be estimated based on the historical break rate of that pipe and the group it belongs to.

    Break rate is expressed by number of breaks per time per length (e.g. breaks/yr/mile).

    So if a pipe (or group) is 400 ft long and has had 2 breaks over a 20 year period (duration of history), then the break rate is 1.3 breaks/yr/mi.
  • When do we use Pipe Group in Break Analyze? What is Pipe Group good for? My conjecture says when we know a break has occurred in the network, but do not know in which pipe, then we define a Pipe Group in which we know the break has occurred. Am I right? When do we use Pipe Group else?

    Meanwhile assigning each Pipe to a Pipe Group is compulsory and computing the analyze needs it to be done. Why does not it (defining a pipe group for all pipes) optional?

    Thanx in advance for your response.