PIPE DIAMETER MEASUREMENT

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Can anyone suggest technology for underground laid pipeline diameter measurement system or any software ?

Much appreciated!

 

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8 Answers

  1. Agree with Muhammad below, GPR is a good option.

  2. Hi Pashwan,

    If you have money to spend you can use ground penetrating radar or other remote sensing method.

    But if you want cheaper solution, you can use inverse hydraulics modeling (e.g. by using EPANET/WaterGem) but you need to have flowrate and presure data for several points of measurement. You can also use analytic approach (calculate pipe diameter based on pressure and flow variabales (e.g. simplfied bernoulli or Darcy Weisbach equation).

    Another approach is by looking for flowmeter installed. You can find the diamater of the flowmeter or if you know the permanent/average flowrate, you can determine diameter based on flowmeter specs. An example is for 40 m3/h flowrate, the diameter of flowmeter would be around 50-65mm and the pipe would be most likely around 50-65mm as well.

     

    Best Regards,

    Alfa

     

     

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    1. GPR cant give diameter , it is only for depth , you have providing me theoretical process which is not possible , Watergems also required pipelie diameter for modelling.

       

      Thanks for your suggestion. 

  3. The technology of passing an intelligent or callipar pig through the pipeline will reveal many other aspects as well like Corrosion, Erosion, Ovality, Thinning, profile of change in diameter across, location of changes etc. The agencies who are specialized in this will help you.

    This technique is extensively used in Oil & Gas sector for Crude Oil & Product pipelines. There is need for pig launching & receiving  faclity. In oil & Gas sector its a permanent feature. In your case it can temporarily done by the party engaged for the purpose.

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  5. You could try ground penetrating radar for an outside diameter or inserting a measurement pig for inside diameter. The pig will be able to give you various types of condition assessment (cracks, wall thickness etc) as well.

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  6. If you want a good estimate, slowly turn a gate valve and count the number of turns between fully open and fully closed.  Pipe diameter in inches (sorry about that) is roughly (turns - 3) /3

    Or, ask someone who operates the pipeline. Valves should be turned twice annually or they will not work when you need them.

    Be aware of water hammer. Return valve to normal position.

  7. If you can excavate the pipe and insert a tap, you can use a pipe caliper to determine the inside diameter.

    If you don't want to tap the pipe, you measure the circumference, divide by Pi and subtract 2x wall thickness.

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  8. If you commission CCTV survey then they will be able to provide you with both diameter and condition of the pipe.

    Regards

    Rania Gideon Hill  

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