To ensure safe operation, soap tests should be conducted on what?

Soap tests are crucial for identifying leaks in gas piping systems, as they provide a simple and effective means to check for the presence of gas at connection points. Conducting soap tests on all connection points made to jurisdictional piping is essential because these are the areas where leaks can most commonly occur due to the potential for improper sealing or mechanical failure.

By testing all connection points, inspectors can ensure that each joint and fitting is secure and that no gas is escaping into the environment, which is a critical safety concern. This proactive approach helps prevent hazardous situations that could arise if a leak goes undetected, especially considering that gas leaks can lead to fire risks or toxic exposure.

The other options are limited in scope; for instance, focusing tests only on high-pressure systems or only on underground piping could leave other vulnerable areas unassessed. Likewise, restricting tests to only new installations might neglect older piping that could also pose safety risks if not maintained properly. Thus, a comprehensive approach involving all connection points to jurisdictional piping is the safest and most effective practice.