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Remarks before made a Hot Tap

Source: 未知 Posted:2014-02-24 16:33 Views:

  • A hot tap shall not be considered a routine procedure, but shall be used only when there is no practical alternative.

 

  • Hot Taps shall be installed by trained and experienced crews.

 

  • It should be noted that hot tapping of sour gas lines presents special health and metallurgical concerns and shall be done only to written operating company approved plans.

 

  • For each hottap shall be ensured that the pipe that is drilled or sawed has sufficient wall thickness, which can be measured with ultrasonic thickness gauges. The existing pipe wall thickness (actual) needs to be at least equal to the required thickness for pressure plus a reasonable thickness allowance for welding. If the actual thickness is barely more than that required for pressure, then loss of containment at the weld pool is a risk.

 

  • Welding on in-service pipelines requires weld procedure development and qualification, as well as a highly trained workforce to ensure integrity of welds when pipelines are operating at full pressure and under full flow conditions.


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