If no minimum pressurization time is specified or it is impractical, maintain pressure for at least how many minutes before inspecting joints?

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The main idea is to allow the system to reach a stable state so leaks can reveal themselves. When you pressurize a joint, seals may need a moment to set and small leaks might not show up right away. Waiting about five minutes gives enough time for the pressure to stabilize and for any seepage to become detectable, reducing the chance of missing leaks. If you go too short, a marginal leak could be missed; going much longer isn’t typically necessary unless the procedure calls for it. So, maintain pressure for at least five minutes before inspecting the joints, then check for leaks using the usual methods (visible seepage, sounds, or a soap solution).