What does distortion affect when locating a pipeline?

• A. The electromagnetic field, not the pipe
• B. The pipe coating
• C. Depth measurement accuracy only
• D. The gas pressure

Answer: (A)

Distortion in this context refers to changes in the electromagnetic field that the locator relies on to find a buried pipe. When you transmit a signal and the pipe responds, the readings depend on a clean, predictable field. Soil conditions, moisture, minerals, nearby metals, or other conductors can alter that field’s shape and strength. Those distortions affect what the receiver detects, which can shift the indicated location or depth. The pipe coating and gas pressure don’t change the electromagnetic field in the way that distorts locating readings, so they aren’t the primary factor here. The key idea is that distortion affects the electromagnetic field, not the pipe itself.