Operation of the ship there are three kinds of commonly used the concept of economic speed: the minimum fuel consumption rate speed and low speed fuel cost, high profit speed. When used for assessment of energy conservation and emissions reduction effect usually adopts the minimum fuel consumption rate speed. Tug is generally recognized as it is not necessary to use economic speed, because the distance is short, time is tight, use the maneuverability of the economic speed is low. But most of the time it is necessary for tug, shuttle pilot can do the job is great in the article. The following conditions occur: 1) by the dock water for 15 to 30 minutes earlier than is the open ocean shipping, or dock no sail directly import ocean shipping, we often to Y515-30 minutes earlier than ocean shipping; 2) good after water diversion is not to rely on directly back to the dock to rest; 3) send good water diversion heel depend, fair tide, full speed is faster than to depend on ocean shipping, then you can adjust the speed to and ocean shipping almost in front of the collar, escort.
1 case require close attention to AIS ocean shipping information, control the speed, to ensure that arrive on pilot sites. 2 kind of situation is required to have a high level of saving consciousness, in the interests of the company to high sense of responsibility and sense of ownership. 3 kind of situation is relatively easy to perform, because to sail around the edge of the ocean shipping is very simple, need not and intersection collision avoidance between ships.
Here is to analyze the fuel consumption and the relationship between the speed of the ship.
The displacement D fuel consumption and speed V, ship and flight S on. Ship fuel consumption per unit time is Q (unit: t) and the ship's displacement D (unit: t) and the relation between the speed V (unit: Kn) for:
Fuel consumption per unit time is Q along with the change of speed V curve as shown in figure 1: