Lubrication oil circulation tanks shall be confirmed cleaned during the 15 months prior to the renewal survey. This may be credited based on relevant documentation provided. Opening up of tanks may be required as found necessary by the surveyor. Requirement of internal examination for lube oil tanks by class surveyor starts after the vessel age is above 15 years. The minimum requirement is one tank. //DNV-RU-SHIP Pt.7 Ch.1. Sec.4.2.3, Pt.7 Ch.1. Sec.4.2
Structural testing of lube oil tanks is part of the renewal scope. I.e. head of liquid shall be at the highest point where the liquid will rise under service conditions and the tank boundaries will be inspected externally for leakage and deformations. A pressure test confirmed by master may be accepted as well. //DNV-RU-SHIP Pt.7 Ch.1 Sec.4.2.1

Heat exchangers are subject to visual inspection by opening up fully or partly as deemed necessary by attending surveyor. Visual external examination with performance test and verification of last overhaul is accepted for pipes, valves, filters, pumps and pump drivers is sufficient. Opening up can be required by attending surveyor if any deemed necessary. //DNV-RU-SHIP Pt.7 Ch.1 Sec.4.5

Last modified: Thursday, 4 May 2023, 4:19 PM