Gas Hot Tapping Procedures for 4" and Above
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Questions and Answers

What is the correct step for attaching the completion machine and alignment tool to the isolation valve?

  • Raise and lower the boring bar until contact is made with the pipe, then advance boring bar until pilot drill contacts the pipe
  • Attach completion machine assembled with alignment tool and completion plug to the isolation valve, then fully open isolation valve
  • Attach the proper size machine adapter to the body of the drilling machine, then attach the drilling machine with equipment and adapter onto the isolation valve
  • Advance shaft until completion plug contacts fitting threads, then rotate shaft until completion plug threads are engaged with fitting threads and securely bolt isolation valve to fitting (correct)

    • What is the purpose of performing a 'dry run' alignment of the completion plug?

  • To ensure the completion plug threads are aligned with the fitting threads before securing the isolation valve to the fitting (correct)
  • To check the condition of the completion plug before attaching it to the isolation valve
  • To determine the travel distance for the hot tap procedure
  • To coat the cutter and pilot bit with cutting grease before attaching the drilling machine

    • What is the correct step for withdrawing the shaft after completing the hot tap procedure?

  • Attach completion machine assembled with alignment tool and completion plug to the isolation valve, then fully open isolation valve
  • Rotate shaft in the opposite direction until completion plug is unscrewed from fitting and withdraw shaft to rearmost position (correct)
  • Attach the proper size machine adapter to the body of the drilling machine, then attach the drilling machine with equipment and adapter onto the isolation valve
  • Raise and lower the boring bar until contact is made with the pipe, then advance boring bar until pilot drill contacts the pipe

    • What should be done to the cutter and pilot bit before attaching the drilling machine to the isolation valve?

    <p>Thoroughly coat the cutter and pilot bit with cutting grease</p> Signup and view all the answers

    What should be done if the boring bar does not advance easily during the drilling operation?

    <p>Retract the boring bar and report to the supervisor</p> Signup and view all the answers

    What is the purpose of retracting the boring bar to its rearmost position?

    <p>To ensure the cutter and pilot bit clears the isolation valve</p> Signup and view all the answers

    What should be done if internal corrosion is found in the examined coupon?

    <p>Immediately report it to the supervisor</p> Signup and view all the answers

    What is the purpose of bleeding off pressure from the isolation valve?

    <p>To ensure completion plug is properly seated</p> Signup and view all the answers

    When should the completion plug be screwed into the fitting?

    <p>After attaching the completion machine assembled with inserting tool</p> Signup and view all the answers

    What is the purpose of operating the drilling machine until the pilot bit penetrates the pipe?

    <p>To measure the travel required to complete the drilling operation</p> Signup and view all the answers

    What should be done if the cut is not complete during the drilling operation?

    <p>Retract boring bar to its rearmost position</p> Signup and view all the answers

    When should the completion flange be bolted solidly to the fitting flange?

    <p>After attaching the completion machine assembled with inserting tool</p> Signup and view all the answers

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