ISO 23765:2021
(Main)Ships and marine technology — Marine environment protection — Specification for collecting data on ship's fuel oil consumption
Ships and marine technology — Marine environment protection — Specification for collecting data on ship's fuel oil consumption
This document provides a method for ships of 5 000 gross tonnage (GT) and above to collect data on fuel oil consumption, as required by regulation 22A of MARPOL, Annex VI. It specifies practical methods to measure the fuel oil consumption, the distance travelled and the hours underway. Annex A provides an example of a ship fuel oil consumption data collection plan.
Navires et technologie maritime — Protection de l'environnement marin — Spécifications relatives à la collecte de données sur la consommation de mazout des navires
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 23765
First edition
Ships and marine technology —
Marine environment protection —
Specification for collecting data on
ship's fuel oil consumption
PROOF/ÉPREUVE
Reference number
ISO 23765:2021(E)
© ISO 2021
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ISO 23765:2021(E)
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ISO 23765:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Information on the ship and fuel oil consumers . 2
4.1 Ship particulars . 2
4.2 Ship fuel oil consumers . 3
5 Methods to measure the fuel oil consumption . 3
5.1 General . 3
5.2 Use of bunker delivery notes (BDNs) . 3
5.2.1 Annual fuel oil consumption . 3
5.2.2 Information from the bunker delivery note . 4
5.3 Use of flow meters . 5
5.4 Use of fuel oil tank monitoring . 5
5.4.1 Remote sounding gauge . 5
5.4.2 Manual sounding measurement . 5
6 Method to measure the distance travelled . 5
7 Method to measure the hours underway. 5
8 Aggregated data report . 6
9 Data quality control . 6
9.1 Bunker delivery notes (BDN) . 6
9.2 Flow meter . 6
9.3 Fuel oil tank monitoring. 7
9.3.1 Remote sounding gauge . 7
9.3.2 Manual sounding measurement . 7
9.4 Distance travelled . 7
9.5 Hours underway . . 7
10 Direct CO emissions measurement . 8
2
Annex A (informative) Example of a ship fuel oil consumption data collection plan .9
Annex B (informative) Guidance on technical specifications and test requirements for
automatic data collection systems using fuel flow rate measuring devices for fuel
consumption .12
Annex C (normative) Standardized data reporting format for the data collection system .15
Bibliography .16
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ISO 23765:2021(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 2, Marine environment protection.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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ISO 23765:2021(E)
Introduction
The International Maritime Organization (IMO) Marine Environment Protection Committee, at its
seventieth session (MEPC 70), adopted resolution MEPC.278(70) on Amendments to MARPOL, Annex VI,
on data collection systems for fuel oil consumption of ships, which entered into force on 1 March 2018.
In accordance with regulation 22.2 of MARPOL, Annex VI, on or before 31 December 2018, the ship
energy efficiency management plan (SEEMP) for ships of 5 000 gross tonnage (GT) and above is
required to include a description of the methodology used to collect the data required by regulation
22A of MARPOL, Annex VI, including the process used to report the data to the ship's administration.
In addition, in accordance with regulation 5.4.5 of MARPOL, Annex VI, administrations are required to
ensure that for each ship to which regulation 22A applies, the SEEMP complies with regulation 22.2.
This is required to be done prior to collection of data under regulation 22A to ensure the methodology
and the process are in place prior to the beginning of the ship's first reporting period.
Resolution IMO MEPC.282(70) 2016, Guidelines for the development of a ship energy efficiency management
[3]
plan (SEEMP) , already provides detailed guidelines for the IMO data collection system. Additionally,
Part 2 of the SEEMP, Ship fuel oil consumption data collection plan, is expected to be verified by the
administrations or recognized organizations (RO). However, some portions needed to be clarified to
prevent controversy between the administrations to improve data quality. This especially pertains to
the methods to measure fuel oil consumption. Three methods for measuring fuel oil consumption (by
bunker delivery note [BDN], flow meter, and sounding) are needed to specify the density calculation
and calibration of each of the measuring devices.
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INTERNATIONAL STANDARD ISO 23765:2021(E)
Ships and marine technology — Marine environment
protection — Specification for collecting data on ship's fuel
oil consumption
1 Scope
This document provides a method for ships of 5 000 gross tonnage (GT) and above to collect data on fuel
oil consumption, as required by regulation 22A of MARPOL, Annex VI. It specifies practical methods to
measure the fuel oil consumption, the distance travelled and the hours underway. Annex A provides an
example of a ship fuel oil consumption data collection plan.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
IMO MARPOL Convention Annex VI, Regulations for the prevention of air pollution from ships
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
ship fuel oil consumption data
data required to be collected on an annual basis and reported as specified in Appendix IX of MARPOL,
Annex VI
3.2
emission
release of substances, subject to control by MARPOL, Annex VI, from ships into the atmosphere or sea
3.3
fuel oil
fuel delivered to and intended for combustion purposes for propulsion or operation on board a ship,
including distillate and residual fuels
3.4
conversion factor
non-dimensional conversion factor between fuel oil (3.3) consumption and CO emission (3.2)
2
Note 1 to entry: It is defined in the 2014 Guidelines on the method of calculation of the attained Energy Efficiency
[4]
Design Index (EEDI) for new ships (resolution MEPC.245(66)), as amended .
3.5
voyage
movement of a ship between a departure from a berth (3.6) to the arrival at the next berth (3.7)
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ISO 23765:2021(E)
3.6
departure from a berth
departure
starting point when a ship leaves a berth (3.11) at one single port boundary (3.12)
3.7
arrival at the next berth
arrival
starting point when a ship is berthed (moored, anchored and/or adrift) at one single port boundary
(3.12)
3.8
calendar year
period from 1 January until 31 December of a year
3.9
hours underway
duration while the ship is in operation under its own propulsion
3.10
distance travelled
actual distance travelled over the ground, in nautical miles
3.11
berth
named or numbered place where a vessel is moored at a wharf
3.12
port boundary
geographic area defined by the designated authority of the states, encompassing the individual port
facilities within a port
4 Information on the ship and fuel oil consumers
4.1 Ship particulars
The following basic vessel information shall be collected:
a) name of the ship;
b) IMO number;
c) company;
d) flag;
e) ship type;
f) gross tonnage;
g) net tonnage (NT);
h) deadweight tonnage (DWT);
i) energy efficiency design index (EEDI) (if applicable);
j) ice class (if applicable).
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ISO 23765:2021(E)
4.2 Ship fuel oil consumers
For collecting fuel oil consumption data, the following information shall be obtained (see Table 1):
a) fuel oil consumers;
b) type/model;
c) number (in ship has two or more machineries in one fuel oil consumer);
d) power (kW);
e) fuel oil type (conversion factor, C ).
F
Table 1 — Example of fuel oil consumer data information format
Fuel oil Type/model Number Power (kW) Fuel oil types (C )
F
consumers Primary/secondary
1 Main engine
2 Auxiliary engine
3 Boilers
4 Inert gas generator
5 Gas turbines
5 Methods to measure the fuel oil consumption
5.1 General
The fuel oil consumption should include all the fuel oil consumed on board including, but not limited
to, the fuel oil consumed by the main engines, auxiliary engines, gas turbines, boilers and inert gas
generator, for each type of fuel oil consumed, regardless of whether a ship is underway or not. The
method for collecting data for annual fuel oil consumption used on a ship can be chosen from three
methods as described in 5.2, 5.3 and 5.4. Except for the case of using a mass flow meter (see 5.3), when
using an annual fuel oil consumption measurement method, the density shall be obtained by one of
the following methods to calculate the volume correction factor and the weight correction factor for
converting the measured fuel oil consumption value into metric tonnes units:
a) on board measurement systems;
b) bunker delivery notes (BDNs) from fuel supplier at bunkering port;
c) laboratory testing.
NOTE Data relating to boil-off gas (BOG) consumed on board the ship for propulsion or operation is collected
[1]
and reported as fuel as part of the data collection system for fuel oil consumption of ships .
5.2 Use of bunker delivery notes (BDNs)
5.2.1 Annual fuel oil consumption
This method determines the annual total amount of fuel oil used based on BDNs, which are required for
fuel oil for combustion purposes, delivered to and used on board a ship in accordance with regulation
18 of MARPOL, Annex VI. Annual fuel oil consumption (Q) should be calculated as follows:
Q = T + R – S – T
1 2
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ISO 23765:2021(E)
where
Q is the annual fuel oil consumption;
T is the remaining fuel oil in tank at the beginning of the year;
1
R is the total fuel oil of bunkered for the calendar year;
S is the total fuel oil offloaded for the calendar year;
T is the remaining fuel oil in tank at the end of the year.
2
Each value should be rounded off to two decimal places.
The amount of any fuel oil loaded or offloaded should be based on the records from the ship's oil record
book. Any supplemental data used for closing identified differences in bunker quantity should be
supported with documented evidence. In the case of a voyage that extends over a data reporting period,
the tank reading should occur by tank monitoring at the ports of departure and arrival of the voyage
and by statistical methods such as rolling average using voyage days.
5.2.2 Information from the bunker delivery note
The BDN includes at least the following information in accordance with Appendix V of MARPOL,
Annex VI:
a) name and IMO number of receiving ship;
b) port of bunkering;
c) date of commencement of delivery;
d) name, address and telephone number of fuel oil supplier;
e) delivered product name;
f) quantity in metric tonnes;
3
g) density at 15 °C, kg/m ;
h) sulfur content, % mass fraction;
i) a declaration signed and certified by the fuel oil supplier's representative that the fuel oil supplied
is in conformity with regulation 18.3 of MARPOL, Annex VI and that the sulfur content of the fuel
oil supplied does not exceed:
— ⧠ the limit value given by regulation 14.1 of MARPOL, Annex VI;
— ⧠ the limit value given by regulation 14.4 of MARPOL, Annex VI;
— ⧠ the purchaser's specified limit value (% mass fraction), as completed by the fuel oil supplier's
representative and on the basis of the purchaser's notification that the fuel oil is intended to be
used:
.1 ⧠ in combination with an equivalent means of compliance in accordance with regulation 4 of
MARPOL, Annex VI; or
.2 ⧠ is subjected to a relevant exemption for a ship to conduct trials for sulfur oxides emission
reduction and control technology research in accordance with regulation 3.2 of MARPOL,
Annex VI.
The declaration shall be completed by the fuel oil supplier's representative by marking the applicable
box(es) with a cross (x).
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ISO 23765:2021(E)
5.3 Use of flow meters
This method determines the total annual amount of fuel oil consumption by measuring fuel oil flow
on board with flow meters. The annual fuel oil consumption is the sum of daily fuel oil consumption
data of all relevant fuel oil consuming processes on board measured by flow meters. The flow meters
applied to monitoring should be located so as to measure all fuel oil consumption on board and should
be identified in this plan. In case of flow meter malfunction, manual tank readings or other alternative
methods shall be conducted instead. It should not be necessary to correct this fuel oil measurement
method for sludge if the flow meter is installed after the daily tank, as sludge is removed from the fuel
oil prior to the daily tank. Annex B gives, for information, a guidance on an automatic data collection
system using fuel flow meters.
5.4 Use of fuel oil tank monitoring
5.4.1 Remote sounding gauge
This method determines the total annual fuel consumption by measuring the remaining amount in
the fuel oil tank through direct reading using an automatic system (remote reading). The total annual
consumption is calculated by summing up the measured daily fuel consumption. The remaining amount
of fuel in the tank is normally measured daily and every time the ship receives or discharges fuel oil
...
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