GTT inside

GTT Inside, the GTT newsletter

GTT Inside #18 - October 2020

 

Message from Anouar Kiassi, Digital & Information VP

IMO regulations regarding Greenhouse Gas (GHG) reduction have resulted in the development of technical and operational measures for ships energy efficiency management.

Under our new mission statement (“raison d’être”), we are committed, more than ever, to contribute to the international effort to reduce the global emissions. Significant reduction of the fuel consumption is possible by operational performance management.

Environmentally friendly measures are effective and widely adopted when aligned with economic performance. In this issue, we will discuss how our practical Smart Shipping solutions help the maritime players achieve these two goals by getting the best performance out of their assets.

 

Effective Ship Performance Management

Voyage Execution & Speed Optimisation

A vessel’s fuel consumption for propulsion is a result of energy required to push the vessel through the water at the given speed. This relationship, between fuel consumption and vessel speed, is typically an exponential one. A vessel sailing with variable speed will usually, for the same distance and duration, consume more fuel compared to sailing with constant speed. Improved planning, better use of vessel specific knowledge, weather forecasts and communication between charterer, port and vessel can improve the speed profile during a voyage and consequently reduce the fuel consumption.

An energy efficient voyage can bring significant savings in fuel costs and also lower emissions. Voyage Optimisation identifies and recommends speed profiles that minimise the voyage operational costs for given routes whilst respecting the given Estimate Time of Arrivals (ETAs).

Voyage Optimisation enables energy efficient voyage planning based on simulations, modelling and ocean forecasts that will maximize energy efficiency during sea passages. Fuel consumption and costs for the voyage are minimized, as are harmful emissions. The most efficient speed of the ship is continuously calculated during the sea passage.

Effective Ship Performance Management

With real time data and the voyage execution module, operators on shore can in real time monitor if the crew complies to instructions and be alerted automatically if not.

On a slow-steaming VLCC, accelerating by 1kn costs an extra 10 to 15 MT of fuel per day. On average bunker price of the past 3 years it costs between 3,000 and 5,000 USD per day. Based on experience, the crew adheres to instructions in a different way when the operation is monitored by operators.

Trim Advisory
Effective Ship Performance Management

The trim and/or draft of the ship influences the hull resistance and therefore the fuel consumption. Better trim and draft will reduce the resistance and therefore less engine power is required which leads to a lower fuel consumption.

Trim Advisory helps the bridge team reduce fuel consumption by providing recommendations on the optimal trim that will lead to minimized hull resistance. This energy saving measure requires a good understanding of the relationship between trim, load and propulsion energy consumption by providing an overview of these important operational parameters and their effects on performance.