Cathodic Protection Tester Practice Exam

What type of pipe locator uses only radio frequency and does not connect to the pipe?

1. Inductive pipe locator

2. Conductive pipe locator

3. Active pipe locator

4. Passive pipe locator

The correct answer is: Inductive pipe locator

An inductive pipe locator uses radio frequency to detect the location of underground pipes without the need for direct connection to the pipe itself. This technology works by generating a radio frequency signal that induces a current in the pipe when the locator is placed above it. As a result, the locator can pick up the emitted signal and determine the pipe’s position. In contrast, a conductive pipe locator requires direct contact with the pipe for operation, often using a signal that travels through the pipe itself. Active pipe locators need a separate transmitter that connects to the pipe to send out a detectable signal. A passive pipe locator detects naturally occurring signals or electromagnetic frequencies without needing to attach to the pipe, but it doesn't specifically focus on the radio frequency method employed by inductive locators. Inductive pipe locators are particularly useful in scenarios where direct access to the pipe may be limited or impractical, making them valuable tools for professionals involved in excavation and underground utility detection. This capability to locate pipes using solely radio frequencies enables efficient and safe underground inspections.