16.1.1 The whole inert gas installation is to be surveyed at intervals of 2½ years. For all ships having a Service extension notation, the survey is to be carried out concurrently with the examination in dry dock or on the slipway, see Pt 1, Ch 2, 3.5 Existing ships – Periodical Surveys 3.5.7, and at the Special Survey. For all other ships, the survey is to be carried out at every Intermediate and Special Survey.
16.2.1 The inert gas system, including alarms and safety devices, is to be examined and tested to demonstrate that it is in good working condition, to the satisfaction of the Surveyors.