Which procedure should NOT be used to check the integrity of a propane piping system?

Using a flame to check for leaks in a propane piping system is highly dangerous and should never be done. The presence of propane, which is highly flammable, combined with an open flame poses an immediate risk of explosion or fire. Safety standards clearly advise against using any form of ignition to detect leaks, as even a small spark can lead to catastrophic consequences.

Monitoring pressure changes, performing visual inspections, and using a soapy water solution are all established and safe methods for detecting leaks. Visual inspections allow the handler to identify any obvious signs of damage or wear in the piping system. Testing with a soapy water solution provides a simple way to see if bubbles form in the presence of escaping gas, indicating a leak. Monitoring pressure changes can help identify if there's a drop in the system, which can signal a potential leak somewhere along the piping. Each of these methods contributes to ensuring the system's safety without introducing additional risks associated with flammable materials.