On my offshore vessel when two fore diesel generators are working the crew observes uncomfortable noise and vibration in accommodation. Can you help me?

In march 2015 we confront similar situation. On this vessel our Service Engineers found out that these two diesel engines, that were powering generators, were also powered by hydraulic clutch two FiFi pumps.

Cross-check of alignment FiFi pumps - diesel engines and diesel engines – generators was performed. Additionally vibrations were measured for whole sets during their operation.

Results from vibration measurement did not show any abnormalities in their operation. All measured values were within ISO and makers limits. There was also no significant frequency component indicating source of the problem. However alignment between one of the generator and diesel engine and between both FiFi pumps clutches – diesel engines was over makers limits.

The recommendation was to perform the alignment of this machines and additionally install a rubber compensator on delivery side of pumps to reduce spreading of vibration on ship’s superstructure.