Fuel Flowmeter Installation: Schemes for Different Engines

Fuel flowmeter installation is not a one-size-fits-all job, and the layout that works on one vessel's fuel system will not necessarily suit another. Two configurations come up most often, and each carries its own engineering trade-offs.

Configuration A: a flowmeter on supply and return

One arrangement places a flowmeter on the line going into the engine and another on the line coming back, then works out consumption as the difference between the two. There is a separate article on this site that goes into how supply and return measurement actually works, including why two meters are needed and how temperature and density are handled, so it is not repeated here.

Configuration B: a single flowmeter with a reservoir

The other arrangement uses a single flowmeter placed between the daily tank and a reservoir, with the engine drawing from and returning to that reservoir rather than to the daily tank directly. Because the return flow stays within the reservoir loop rather than going back past the meter, one flowmeter on the supply side into the reservoir can represent net consumption without a second meter subtracting a return flow.

Why there is no universal installation scheme

Which configuration fits depends on the engine's fuel system design, how the fuel lines are already laid out, what needs to be measured, and what an engineering survey of the actual vessel finds. A scheme that suits one engine type does not automatically suit another, which is why the installation method is decided case by case rather than applied the same way across an entire fleet.

Deciding fuel flowmeter installation in MANTRAZ

In MANTRAZ, the instrumentation method for a vessel's fuel system is set based on the engine, the fuel system layout, the measurement that is actually needed, and an engineering survey of the vessel, not a single scheme applied to every installation.

To find out which fuel flowmeter installation scheme fits a vessel like yours, request a MANTRAZ demo.