M/E operation in adverse weather conditions

Technical Management Main Engine
,
1

Hello!
Do you have any tips or recommendations for the protection of the M/E (especially liners and piston rings) when sailing in adverse weather conditions?

2

Although you will get guidance from makers manual. Still it’s better to reduce RPM in Rough weather condition. Also pls if ship is ME/Bor C Running mode of engine to be changed from RPM to Torque mode. On older MC engine manual need to activate rough sea mode .

3

Hi , dear ALL .
Will be glad to find info regarding this mode change , as in manual no so full description available. IN fact , when System change mode from RPM to Torque we can observe some changes on MOP panel . Thanks and Brgds

4

image

5

MAN B&W ME-C engines have a torque mode that allows the engine speed to drift within a specified range, which stabilizes the torque and reduces fuel consumption:

  • Torque mode

The default governor setting for MAN Torque, which is activated when operating maneuver FULL and above. This mode allows the engine speed to drift within a specified range, which stabilizes the torque and reduces fuel consumption.

  • RPM mode

The previous default governor setting for ME engines, which focuses on keeping a steady RPM. This mode requires the engine to increase and decrease the load to follow the ordered RPM, which triggers a fluctuating fuel index.

1 Like
6

@Sankpat12 Thank you for this insight!

7

MAN ME-B/C Engines have been designed to run constantly in torque mode. Torque governor mode provides the lowest SFOC.
When operating in Torque or Index control mode, the effect is same.T he fuel index is limited from the system with a minimum allowable deviation.
Meaning that in rough weather conditions the rpm will greatly fluctuate increasing the risk of overspeed.
Having this in mind, the software will auto change to RPM Control (from torque/index control) when the engine’s rpm are fluctuating.
In addition and as a rule of thumb torque/index control mode shall be selected when logging Performance Reports, in order the Pi to be kept as steady as possible.

Furthermore and based on service experience conflicts between vessel’s C/E and Master arise when torque/index control is selected.
The usual practice during sea passage is the agreement of the rpm that the engine will operate.
Keeping the system in index/torque control alters constantly the Engine’s RPM.

BR
Dimitris Diamantis

2 Likes