What does a Pressure Test verify?

A pressure test is primarily used to verify the gastight integrity of gas piping systems. This ensures that there are no leaks in the pipes that could allow gas to escape, which is crucial for safety and proper operation within an LP-gas system. Conducting a pressure test involves applying a specific pressure to the system and monitoring it over a designated period to see if the pressure holds steady. A drop in pressure would indicate a leak, which must be addressed to prevent hazards such as explosions or fire.

In contrast, the other choices focus on aspects not directly related to the primary purpose of a pressure test. For instance, measuring gas pressure in the storage container pertains more to operational pressures rather than leak detection, while temperature and chemical composition evaluations are typically conducted through separate tests and do not assess the physical integrity of the piping. Thus, focusing on the gastight integrity of gas piping captures the essential intent of what a pressure test verifies within the context of LP-gas safety practices.