Ships and marine technology — General requirements for inclinometers used for the determination of trim and list of LNG carriers

This document provides general requirements for the accuracy, installation, calibration and verification of trim and list inclinometers used for the determination of trim and list of LNG carriers for the purpose of measuring on-board cargo level.

Navires et technologie maritime — Exigences générales relatives aux inclinomètres utilisés pour la détermination de l'assiette et la gîte des méthaniers

General Information

Status
Published
Publication Date
31-Jan-2019
Technical Committee
Drafting Committee
Current Stage
6060 - International Standard published
Start Date
01-Feb-2019
Completion Date
01-Feb-2019
Ref Project

Buy Standard

Standard
ISO 19636:2019 - Ships and marine technology -- General requirements for inclinometers used for the determination of trim and list of LNG carriers
English language
13 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO
STANDARD 19636
First edition
2019-02
Ships and marine technology —
General requirements for
inclinometers used for the
determination of trim and list of LNG
carriers
Navires et technologie maritime — Exigences générales relatives aux
inclinomètres utilisés pour la détermination de l'assiette et liste des
méthaniers
Reference number
ISO 19636:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO 19636:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 19636:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Safety precautions .............................................................................................................................................................................................. 2

4.1 Existing safety regulations, standards and classification societies rules ............................................. 2

4.2 Equipment precautions ................................................................................................................................................................... 2

5 Design requirements ........................................................................................................................................................................................ 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 A Trim and list inclinometer’s axes and range ............................................................................................................ 3

5.3 Communication methods ............................................................................................................................................................... 3

5.3.1 Analogue current interface type ......................................................................................................................... 3

5.3.2 Digital interface type .................................................................................................................................................... 3

5.4 Levelling of a trim and list inclinometer ........................................................................................................................... 3

5.5 A trim and list inclinometer’s protection box .............................................................................................................. 4

5.6 Sealing, security and unsealing ................................................................................................................................................. 4

5.7 Marking serial number .................................................................................................................................................................... 4

6 Installation ................................................................................................................................................................................................................. 5

6.1 General ........................................................................................................................................................................................................... 5

6.2 Installation of a trim and list inclinometer ..................................................................................................................... 5

6.3 Alignment of a trim and list inclinometer ....................................................................................................................... 5

6.4 Alignment of a trim and list inclinometer — Ship at dry dock ...................................................................... 6

6.5 Installation of a trim and list inclinometer — Ship at floating dock ........................................................ 6

6.6 Installation of a trim and list inclinometer — Ship anchored or moored ............................................ 7

7 Accuracy ........................................................................................................................................................................................................................ 8

7.1 General ........................................................................................................................................................................................................... 8

7.2 Uncertainty of a Trim and List inclinometer's inherent error - Factory acceptance

test (FAT) ...................................................................................................................................................................................................... 8

7.3 Uncertainty of reference standard -Site acceptance test (SAT) .................................................................... 8

7.4 Integrated overall accuracy .......................................................................................................................................................... 9

8 Verification test and certification ....................................................................................................................................................... 9

8.1 General ........................................................................................................................................................................................................... 9

8.2 Visual examination .............................................................................................................................................................................. 9

8.3 Verification test ......... ...........................................................................................................................................................................10

8.4 Sealing .........................................................................................................................................................................................................10

8.5 Certificate .................................................................................................................................................................................................10

Annex A (informative) Verification of alignment for trim and list inclinometers ..............................................11

Bibliography .............................................................................................................................................................................................................................13

© ISO 2019 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 19636:2019(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

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. 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. www .iso .org/patents

Any trade name used in this document is information given for the convenience of users and does not

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 8, Ship design.

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 2019 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 19636:2019(E)
Introduction

Inclinometers are used to determine the trim and list of various types of ships floating on the water.

In the case of liquefied natural gas carriers (LNG carriers), on which a large quantity of LNG is traded,

based on the results of static measurement, determination of trim and list, along with other elements, is

particularly important because the measurement of the liquid level of a cargo tank is inevitably affected

by the ship’s inclination.

This document provides general requirements for the accuracy, installation, calibration and

verification of inclinometers used for the determination of trim and list of LNG carriers, but is not

intended to preclude the use or development of any other technologies or methods or the revision of

the methods presented. Users of this document are encouraged to review, in detail, the latest editions

of the publications, standards and documents referenced in this document in order to gain a better

understanding of the methods described.

Users of this document should consider the applicable safety or operating practices recommended by

organizations, such as the International Maritime Organization (IMO), the International Chamber of

Shipping (ICS), the Oil Companies International Marine Forum (OCIMF), the International Group of

LNG Importers (GIIGNL) and the Society of International Gas Tanker and Terminal Operators (SIGTTO),

or individual operating companies, as well as any other safety or environmental considerations, local

regulations or the specific provisions of any contract.
© ISO 2019 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 19636:2019(E)
Ships and marine technology — General requirements for
inclinometers used for the determination of trim and list of
LNG carriers
1 Scope

This document provides general requirements for the accuracy, installation, calibration and verification

of trim and list inclinometers used for the determination of trim and list of LNG carriers for the purpose

of measuring on-board cargo level.
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.

IEC 60079-0, Explosive atmospheres —Part 0: Equipment — General requirements
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at http: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
custody transfer measurement system
CTMS

system that processes inputs from an ATG (automatic tank gauge) system, thermometers, pressure

gauges, etc., and provides custody transfer measurement information on board, generating documents

with regard to custody transfer of LNG
Note 1 to entry: CTMS components include:
a) automatic level gauge system (radar, microwave, capacitance and float types),
b) automatic temperature gauge,
c) automatic pressure gauge,
d) trim and list indication system

Note 2 to entry: A trim and List inclinometer system can be typically incorporated as part of a CTMS.

Note 3 to entry: See Figure 1.
© ISO 2019 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 19636:2019(E)
Key
1 trim and list inclinometer 4 connection/control box
2 sensor 5 custody transfer system (cts) unit
3 protection box 6 trim and list indicator
Figure 1 — Outline of trim and list inclinometer system
3.2
trim and list inclinometer
inclinometer used to determine the trim and list of LNG carriers
3.3
inherent error

error of a trim and list inclinometer when it is tested and verified against a reference standard under

controlled conditions as specified by the manufacturer
4 Safety precautions
4.1 Existing safety regulations, standards and classification societies rules

It is the responsibility of the user of this document to consider the applicable safety or operating

practices recommended by regulatory agencies and organizations, to establish appropriate health and

safety practices and to determine the applicability of regulatory limitations prior to use.

4.2 Equipment precautions

All electric components for the ship’s trim and list inclinometer installed in hazardous areas shall meet

the requirements of IEC 60079-0 applicable for the specific zone within the hazardous area. They shall

conform to the applicable sections of the national and/or international electrical safety standards

2 © ISO 2019 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 19636:2019(E)

and classification societies rules. Trim and list inclinometers shall be maintained in safe operating

conditions in accordance with the manufacturers’ instructions.
5 Design requirements
5.1 General

A trim and list inclinometer shall meet the design requirement specified in 5.2 to 5.7.

5.2 A Trim and list inclinometer’s axes and range
List axis (X) Trim axis (Y)
negative (-) angle list to port trim by stern (aft)
positive (+) angle list to starboard trim by head (forward)
typical range −5° to +5° −2° to +2°

An LNG carrier operates typically within a list of ±1° and a trim of ±3 m. A trim and list inclinometer

should be chosen to at least cover the normal operation range but preferably to also cover non-typical

situations.
5.3 Communication methods
5.3.1 Analogue current interface type

A trim and list inclinometer shall transmit its output signal as from 4 mA to 20 mA current.

5.3.2 Digital interface type
A tr
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.