Auramarine helps to improve your fuel consumption measuring and reporting. To find the best fit for your ship or fleet, the easiest way is to contact Auramarine and let us review your fuel supply system's current measuring and reporting capabilities. Based on the review, we will recommend specific improvements to reach compliance with reporting regulations and to support your ship's optimised fuel profile.
Mass or volumetric flow meter?
Measuring and documenting the consumption of fuel on board a vessel has become increasingly necessary to improve efficiency and to keep the fuel costs in control. Also, compliance with the EU MRV and IMO data collection regulations requires accurate fuel consumption measuring.
Fuel consumption measuring can also bring benefits in fuel changeover situations.
Auramarine fuel handling systems incorporate numerous flow meters. If existing flow meters are becoming outdated and new flow meters are being considered to enable real-time measurements on board with higher degrees of accuracy, there are two main options:
Mass flow meters
If bunkers are purchased in metric tonnes, it is easier to measure fuel consumption in terms of mass weight. Most marine fuel oil-type mass flow meters use a laterally vibrating curved tube mass flow meter, which also measures the density of the fluid. Such a design provides excellent accuracy both for low and high fuel flows, which is a benefit especially if multiple fuels are in use. Mass flow meters always provide comparable results between fuels.
- not prone to sticking and also provide density reporting
- naturally sensitive to surrounding vibrations and pulsations - it must be ensured that the fuel handling system is not impacted by external disturbances from the main or auxiliary engines.
- precise mass volume flow and density measuring
- compact, drainable design
- built with advanced architecture
- a wide variety of I/O and application flexibility
- the top choice for compact, integral mounting
Volumetric flow meters
Most volumetric flow meters have moving parts, either wheels or screws. This may cause issues in operation and in worst case a volumetric flow meter needs to be bypassed. Volumetric flow meters generally cost less, but they only measure fuel volume and do not consider fuel density. Therefore, they are not considered the best option for multi-fuel systems.
- positive displacement principal
- electronic display of total and resettable volume and actual flow rates
- adjustable analog (mA) and pulse output signals
Most of the installed flow meters on board are of volumetric type and, if needed, there are certain upgrade options for receiving more accurate fuel consumption values:
1. Replacement of volumetric with mass flow meters
To replace a volumetric flow meter with a mass flow meter, usually some piping modifications are needed as the size of the mass flow meter is usually larger. Also a degree of integration is needed into the fuel handling system for effective operation.
2. Upgrade of existing volumetric flow meters
Another possibility is to combine the measured density information with the volumetric information. This can in certain cases be a more economical alternative and the indications are that it is equivalently accurate as mass flow meters under normal operating conditions. It is also suitable for low or high flows. The upgrade also requires certain re-cabling, engineering updates and integration within the fuel handling system to ensure effective operation.
3. Separate flow meters for each fuel type in use
Every ship is different from a technical, trading and operational perspective. However, for all retrofits some elements remain essential, namely cost-efficiency and short lead times from design to delivery.
Auramarine is at your service to help you navigate the complexities of class compliance, and find the safest and most cost-efficient retrofit solution for your fuel supply system. We also keep the future in mind, ensuring your system is as flexible as it can be to accommodate change. Contact us to find the best solution to meet your ship’s needs.
Tel.: +358 20 486 5030
Order our newsletters