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The piping system shall withstand the test pressure specified without showing any evidence of leakage or other defects. Any reduction of test pressures as indicated by pressure gauges shall be deemed to indicate the presence of a leak unless such reduction can be readily attributed to some other cause.
G2417.5.1 (406.5.1) Detection Methods
The leakage shall be located by means of an approved gas detector, a noncorrosive leak detection fluid or other approved leak detection methods.
G2417.5.2 (406.5.2) Corrections
Where leakage or other defects are located, the affected portion of the piping system shall be repaired or replaced and retested.

Related Code Sections

705.4 Gaseous Hydrogen Systems, Detection of Leaks and Defects
defects. Any reduction of test pressures as indicated by pressure gauges shall indicate a leak within the system. Piping systems shall not be approved ...