Intermediate Survey

An intermediate survey is a classification society survey conducted between the second and third annual surveys within the five-year special survey cycle — typically at the vessel's two-and-a-half-year point. Its scope is more detailed than an annual survey but less comprehensive than the special survey: for most vessel types it includes an in-water examination of the hull, internal examination of selected cargo holds or tanks, testing of steering gear, anchor equipment, and firefighting systems, and a thorough review of the planned maintenance system records. For tankers and bulk carriers subject to the enhanced programme of inspections (ESP) under IMO Resolution A.744(18), the intermediate survey requirements are more demanding, including close-up surveys of structural members in specified cargo tanks or holds, thickness gauging, and testing of high-level alarms and overpressure/vacuum protection. The chief officer and chief engineer must prepare detailed maintenance records and ensure that all identified defects from previous surveys have been rectified before the surveyor's attendance. Satisfactory completion of the intermediate survey results in an endorsement on the classification certificate confirming continued class without conditions.