KPI030 | SOx efficiency V4.0

Key Performance Indicator

This KPI expresses the energy efficiency of a ship by comparing emitted mass of SOx emitted relative to the transport work performed.

Interpretation	The expression gives the emitted mass of SOx per ton cargo transported per mile. As the PI value "Emitted mass SOx" is to be given in kg, the figure is multiplied by 1 thousand to get the KPI value in g/transport work (tonmile, passengermile, TEUmile, etc).
Notes	The issue of SOx efficiency is complicated by the fact that there are several influencing factors. The commercial operator is responsible for utilization of the ship’s capacity hereby affecting the transport work. The other main factor regarding transport work is the market itself. Ship’s attributes such as hull design, engine type (and to some extent age) as well as the load factor for each voyage are all influencing the quantity of emitted mass of SOx through the amount of fuel burned.
Unit	g/[Cargo Unit] mile
Scope	Ship level
Calculation period	Quarterly

Formula

[formula]KPI030 = \frac {PI009} {PI064} \times 10^3[/formula]

PI009	Emitted mass of SOx
PI064	Transport work

Example

PI009	Emitted mass of SOx	= 2000000 kg
PI064	Transport work	= 20,710,647,000 ton mile
KPI Value	SOx efficiency	= 0.097

Ranking calculation example

Step 1: Calculate KPI value

PI009 Emitted mass of SOx = 2000000 kg

PI064 Transport work = 20710647000 [cargo unit] mile

Step 2: Calculate percentile rank by comparing KPI value against other ships with the same criteria. We assume that another 99 (100 in total) participate in the ranking with the same criteria and our ship has position 33 and you are the only ship in that rank.

Step 3: Calculate the percentile rank by capturing the count of all participant below your rank (cl). The frequency of ships in your same rank (fi). The total number of ships in the ranking segment (N).

[formula] KPI030_{Percentile Ranking} = \frac{cl+05*fi}{N} * 100 = \frac{67+0.5*1}{100} * 100 = 67.5 [/formula]

Interpretation: Based on the above example, we could say that, when it comes to KPI030 SOx efficiency, this ship belongs in the 67.50th percentile of the ships that are being compared with based on its ranking criteria in the respective quarter.

External references

SEEMP, MEPC.1/Circ.684, GUIDELINES FOR VOLUNTARY USE OF THE SHIP ENERGY EFFICIENCY OPERATIONAL INDICATOR (EEOI), and EU MRV