Sound is system-dependent
Pressure, pipe material, depth and the character of the leak affect what can be heard. Background activity can mask a useful signal.
Compare useful points
Accessible fittings and the suspected route help determine listening positions. A known layout improves interpretation.
Support the conclusion
Sound evidence needs to fit other observations before opening work is proposed. A quiet result does not guarantee there is no leak.
Explore the relevant service
General information for planning an investigation. The property, instruction and findings determine the appropriate work.