An ABS technical investigation identified occasional vibrations exceeding limits on a twin propeller LNG carrier during the second gas trial
An ABS technical investigation, conducted at the request of a prominent Greek-based operator of LNG carriers, identified occasional, but infrequent, vibrations exceeding limits on a twin propeller LNG carrier fitted with super-efficient three-bladed propellers.
The issue was resolved in conjunction with the vessel’s classification society, engine designer...
http://www.allaboutshipping.co.uk/2019/09/12/the-abs-solution-for-twin-screw-vibration/