How is evidence of leakage determined during a pressure test?

During a pressure test, evidence of leakage is primarily determined by monitoring the pressure gauges. If there is a reduction in the test pressure displayed on the gauges, it indicates that there is a leak within the system, as the pressure should remain stable if there are no leaks. This drop in pressure is a clear and quantifiable indication of a breach in the integrity of the pipes or connections, making it a reliable method for assessing system integrity during maintenance or installation.

Visual inspection of the piping, while helpful in identifying obvious issues or damages, does not provide conclusive evidence of small or hidden leaks. Similarly, while the presence of a gas odor is a strong indicator of a leak, it is not a method used during a pressure test to quantitatively measure leakage. Temperature changes in the system may occur for various reasons but do not directly indicate the presence of a leak and are not a standard method for determining leakage during these tests.