ISO 21562:2020

Ships and marine technology - Bunker fuel mass flow meters on receiving vessel - Requirements

This document specifies requirements for Coriolis mass flow meter (MFM) systems installed on and used by vessels for the accurate measurement of bunker fuels received. It defines metrology and security requirements as well as testing requirements of the MFM system for the receiving vessel. This document complements ISO 8217, ISO 22192 and OIML R117. This document does not cover mass flow meters used for custody transfer, nor does it address overall bunker delivery procedural issues, such as delivery system integrity and transfer operations. It is not applicable to cryogenic fuels such as LNG. For bunker delivery using a Coriolis mass flow meter system in a custody transfer role, refer to ISO 22192.

Navires et technologie maritime — Appareils de mesure du débit massique des soutes sur le navire de réception — Exigences

General Information

• Status: Published
• Publication Date: 19-Jul-2020
• ICS: 47.020.30 - Piping systems
• Technical Committee: ISO/TC 8/SC 3 - Piping and machinery
• Drafting Committee: ISO/TC 8/SC 3 - Piping and machinery
• Current Stage: 9060 - Close of review
• Completion Date: 04-Mar-2031

Overview

ISO 21562:2020 - Ships and marine technology - Bunker fuel mass flow meters on receiving vessel - Requirements - defines technical, metrological and security requirements for Coriolis mass flow meter (MFM) systems installed on ships to measure bunker fuels received. The standard focuses on accurate onboard measurement for bunker receipt (non-custody-transfer), specifying design, testing, calibration and verification practices to achieve reliable mass measurement and reduce bunkering disputes.

Key topics and technical requirements

• Scope and exclusions
  • Applies to Coriolis MFM systems on receiving vessels for bunker fuels (Class F).
  • Does not cover custody-transfer meters or cryogenic fuels (LNG). For custody transfer see ISO 22192.
• Design and materials
  • Metallic casings and pressure-retaining parts; corrosion-resistant fasteners for fluid-contacting components.
  • Threaded fittings not used for pipe sizes > DN 50.
• Environmental and mechanical tests
  • Prototype environmental testing: vibration, temperature and weather tightness (IACS-acceptable).
  • Hydrostatic test at 1.5× MAWP (maximum allowable working pressure).
  • Operating ambient temperature range: −40 °C to +60 °C.
  • Minimum pressure rating: ≥ 1 MPa.
• Metrology and calibration
  • MFM must be calibrated prior to installation; calibration fluid may be water or hydrocarbon equivalent.
  • Calibration traceable to SI mass units by an ISO/IEC 17025 laboratory or OIML issuing authority.
  • Device-level calibration requirement: maximum measurement uncertainty ≤ 0.2% (device); system guideline: ≈ 0.5% expanded uncertainty for bunker fuel applications, accounting for product and process influences.
  • Verification on board by a qualified independent party.
• Security and data
  • Requirements for equipment security, software integrity and measurement data recording to ensure tamper-evident, auditable records.
• Marking and documentation
  • Mandatory markings (manufacturer, serial, MAWP, flow direction, transmitter info, year).
  • Procedural guidance for commissioning, verification, start/end of receipt and record keeping.

Applications and users

ISO 21562:2020 is practical for:

• Shipowners, operators and chief engineers implementing onboard metering for bunker receipts
• Naval architects and shipbuilders specifying MFM installations
• Fuel metrology laboratories and calibration houses (ISO/IEC 17025)
• Classification societies, port authorities and marine surveyors performing verification and acceptance
• MFM manufacturers and system integrators developing shipboard Coriolis measurement systems

Benefits include improved accuracy of bunker quantity records, fewer disputes with suppliers, and standardized commissioning and verification procedures.

Related standards

• ISO 8217 (bunker fuel specification)
• ISO 22192 (Coriolis MFM for custody transfer)
• OIML R117 (flow meter recommendations)
• ISO/IEC 17025 (calibration laboratory competence)

Keywords: ISO 21562:2020, bunker fuel mass flow meters, Coriolis MFM, metrology, calibration, bunker receipt, marine measurement standards.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 21562
First edition
2020-07
Ships and marine technology —
Bunker fuel mass flow meters on
receiving vessel — Requirements
Navires et technologie maritime — Appareils de mesure du débit
massique des soutes sur le navire de réception — Exigences
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Design and environment testing . 2
5.1 Materials and equipment . 2
5.2 Environmental tests . 2
5.3 Hydrostatic test . 3
5.4 Temperature . 3
5.5 Pressure rating . 3
5.6 Non-metallic materials . 3
5.7 Marking . 3
6 Metrological requirements . 3
6.1 General . 3
6.2 MFM requirements . 4
6.3 MFM system requirements . 4
7 Security requirements . 4
7.1 General . 4
7.2 Security features . 5
7.2.1 Equipment security . 5
7.2.2 Software security . 5
7.2.3 Measurement data recording . 5
8 MFM selection and installation requirements . 5
8.1 General . 5
8.2 MFM selection . 5
8.3 MFM system installation and commissioning . 6
9 MFM system verification . 6
10 Metering procedures . 6
10.1 General . 6
10.2 Documentation . 7
10.3 Bunker fuel receipt . 7
10.3.1 Custody transfer pre-delivery conference . 7
10.3.2 Preparation of MFM system for bunker receipt . 7
10.3.3 Start of bunker receipt . 7
10.3.4 End of receipt . 8
Annex A (informative) Example set-up of a laboratory calibration facility for a Coriolis
MFM — Gravimetric (weighing) method . 9
Annex B (informative) Schematic diagram of MFM system on receiving vessel .10
Annex C (informative) Information required — Checklist .11
Bibliography .13
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
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
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
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
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constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 3, Piping and machinery.
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.
iv © ISO 2020 – All rights reserved

Introduction
Accurate measurement of large quantities of bunker fuels received by ships around the world has
historically been difficult, with many ships relying on outdated methods of verification, such as before-
and-after manual measurement of fuel tank levels. The potential for inaccuracies is significant and can
result in disputes between the fuel supplier and the ship.
This document addresses the need for standardization of meters used to accurately measure the
quantity of fuel received. Traditionally, volumetric flow meters have raised accuracy concerns because
of the potential for air and other gases to affect the measurement of the fluid. Also, entrained air can
cause inaccurate shipboard tank readings during and immediately after bunkering.
Accurate measurement of bunker fuel receipt quantities using mass flow meters will result in greater
efficiencies in the ship bunkering process and reduce disputes.
INTERNATIONAL STANDARD ISO 21562:2020(E)
Ships and marine technology — Bunker fuel mass flow
meters on receiving vessel — Requirements
1 Scope
This document specifies requirements for Coriolis mass flow meter (MFM) systems installed on and
used by vessels for the accurate measurement of bunker fuels received. It defines metrology and
security requirements as well as testing requirements of the MFM system for the receiving vessel. This
document complements ISO 8217, ISO 22192 and OIML R117.
This document does not cover mass flow meters used for custody transfer, nor does it address overall
bunker delivery procedural issues, such as delivery system integrity and transfer operations. It is not
applicable to cryogenic fuels such as LNG.
For bunker delivery using a Coriolis mass flow meter system in a custody transfer role, refer to
ISO 22192.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bunker
bunker fuel
fuel (Class F) supplied to a vessel for its propulsion and/or operation
Note 1 to entry: Class F fuels are specified in ISO 8217.
3.2
mass flow meter
MFM
equipment designed to directly measure and indicate the mass of bunker fuel (3.1) received by a ship
3.3
maximum allowable working pressure
MAWP
highest stress to which a piping system component can be subjected, based on materials and design
calculations
3.4
maximum mass flow rate
Q
max
maximum flow rate up to which the MFM system (3.5) has been qualified to operate in compliance with
the required accuracy
Note 1 to entry: The maximum value is normally determined by the application.
3.5
MFM system
bunker fuel (3.1) receiving system, comprising the mass flow meter (3.2) and its ancillary devices,
pipelines and seals between the vessel’s bunker manifold and the mass flow meter
3.6
minimum mass flow rate
Q
min
minimum flow rate to which the metering system has been qualified to operate, in compliance with the
required accuracy
Note 1 to entry: The minimum value is normally determined by the flow metering system.
3.7
minimum measured quantity
MMQ
smallest quantity of liquid for which the measurement is metrologically acceptable for a given system
or element
4 Symbols and abbreviated terms
AC alternating current
DC direct current
DN nominal diameter
IEC International Electrotechnical Commission
LFC low flow cut-off
Q maximum flow rate
max
Q minimum flow rate
min
P pressure
MAWP maximum allowable working pressure
MFM mass flow meter
MMQ minimum measured quantity
OIML International Organization of Legal Metrology
5 Design and environment testing
5.1 Materials and equipment
MFM casings, as well as any pressure-retaining parts, shall be of metallic construction. Materials
rendered ineffective by heat shall not be used in the construction of the meter casing or any pressure-
retaining parts. All other parts shall be constructed of materials suitable for the service intended.
Fasteners in contact with interior fluid shall be of corrosion-resistant materials.
Threaded fittings shall not be used in pipe sizes greater than DN 50.
5.2 Environmental tests
Unless otherwise specified, environmental tests shall be conducted on a prototype of each meter model.
2 © ISO 2020 – All rights reserved

MFM for marine applications should have documentation of completion of the following tests:
a) vibration,
b) temperature,
c) weather tightness.
The tests abo
...