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VE RS I ON D O CU MEN T TI TLE RE LEAS E DAT E
03 EL – Owner’s Manual 2022-04-29
EL – Owner’s Manual – Rev.04 – April 2022 44
This is a draft manual, technical specifications are subject to change
8. APPENDIX
Appendix I. Hydrogen Leak Testing
As part of a hydrogen device, it is of vital importance to check every connection made for leaks. For
more information on this matter, please refer to the appendix of ASME B31.12.
There are three main ways recommended to check for leaks:
1. Surface hydrogen detection
2. Soap bubble testing
3. Pressure drops testing
Surface hydrogen testing
Using a calibrated hydrogen sniffer, slowly check for leaks around each connection.
PROS CONS

Precise, it can pinpoint even small leakages

Can grade leakages according to leakage
rates

Does not work when there are elevated
levels of hydrogen in the atmosphere
Soap bubble testing
Using a mixture of soap and water (please ensure the soap used is compatible with the device and the
materials used), the solution is dropped on individual connections using a small pipette. If the
connection bubbles, a leak is present.
PROS CONS

Can be fast for larger leaks on small parts
when testing multiple at one time

Low-cost

Best method for detecting exact leak
location detection

Accurate, it works even with elevated
background H
2
levels

Cannot detect tiny leakages

No leak rate or test result information

Slow: Detecting small bubbles on typical
parts can take much longer than other
methods.

Risky: An extremely operator dependent
technique with a high possibility of passing
actual failures.
Pressure drop testing
This test is performed by isolating individual sections of a pipe while monitoring the pressure contained
within over time and should be performed at the maximum operating pressure of the device. If a drop
in pressure is observed, which cannot be attributed to changes in temperature, a leak exists.
PROS CONS

Useful for final verification during device
commissioning

Can verify several connections at the same
time

Cannot detect exact leakage source

Cannot grade leakage rates accurately