Question

True or False ( t or f) In regards to DCVG: the interrupter is set to cycle at a very fast rate with the ON period less than the OFF period, such as a 1/3 second ON and 2/3 second OFF

Answer 1

The statement is true. In DCVG surveys, an interrupter cycles a direct current in a pipeline at a quick rate, with the 'On' period being typically shorter than the 'Off' period (e.g., 1/3 second 'On' and 2/3 second 'Off'). This technique helps identify coating defects.

Step-by-step explanation:

The statement is True. In Direct Current Voltage Gradient (DCVG) surveys, the procedure involves using an interrupter to cycle between an 'On' and 'Off' state at a quick rate. This disrupts the flow of the direct current (DC) in the pipeline being examined. The 'On' period is typically shorter than the 'Off' period. For example, it could be a 1/3 second 'On' followed by a 2/3 second 'Off'. This technique is commonly used in the identification of coating defects in buried pipelines.

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