11. State requirements about economical norm of marine propulsion plant?

The economical norm in operating of marine propulsion plant is estimated by amount of fuel consumption of a main engine on one knot of itinerary:

gM=B/Vt   (kg/knot).

Where:

- V: Speed of the ship                                                      (knot/h).

- t: Working time of propulsion plant                      (h)

- B: The fuel consumption of main engine in the working time t (h). It can be determined:

B=ge.Ne.t   (kg).

With ge: Specific fuel consumption of main engine. (kg/hp.h).

And then:

gM =ge.Ne.t/Vt = ge.Ne/V  (kg/knot)