To test the piping correctly, where should the probe be positioned?

Positioning the probe 6 inches above the pipe is crucial for accurately testing the piping. This height allows the probe to effectively measure concentrations of gas in the area around the pipe, ensuring that any potential leaks are detected. The 6-inch height is a standard practice that balances the need to assess the potential for gas accumulation with the practicalities of avoiding interference from the pipe itself or any surrounding structures.

At this distance, the probe can successfully capture gas that may escape from the joints or fittings of the pipe while minimizing the impact of other environmental factors. This method enhances safety by providing clear, actionable data about the condition of the piping system and identifying any immediate concerns that require attention.