Refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels — Dimethylether (DME) — Measurement and calculation on board ships

ISO 16384:2012 provides guidance on the practices for custody transfer of dimethylether (DME) on board ships, at both the loading and the discharging ports. It covers such aspects of volumetric calculation on board as measurement of liquid volume, vapour volume, temperature and pressure; and accounting for the total quantity of DME on board before and after loading/discharging, regardless of the type of ship's tank.

Hydrocarbures réfrigérés et combustibles gazeux liquéfiés à base non pétrolière — Diméthyléther (DME) — Mesurage et calculs à bord des navires

General Information

Status
Published
Publication Date
04-Nov-2012
Current Stage
9093 - International Standard confirmed
Start Date
27-Mar-2018
Completion Date
27-Mar-2018
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ISO 16384:2012 - Refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels -- Dimethylether (DME) -- Measurement and calculation on board ships
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INTERNATIONAL ISO
STANDARD 16384
First edition
2012-11-01
Refrigerated hydrocarbon and non-
petroleum based liquefied gaseous
fuels — Dimethylether (DME) —
Measurement and calculation on
board ships
Hydrocarbures réfrigérés et combustibles gazeux liquéfiés à base
non pétrolière — Diméthyléther (DME) — Mesurage et calculs à
bord des navires
Reference number
ISO 16384:2012(E)
ISO 2012
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ISO 16384:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any

means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the

address below or ISO’s member body in the country of the requester.
ISO copyright office
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Published in Switzerland
ii © ISO 2012 – All rights reserved
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ISO 16384:2012(E)
Contents Page

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

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

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

2 Terms and definitions ..................................................................................................................................................................................... 1

3 Characteristics and properties of DME ......................................................................................................................................... 2

3.1 General ........................................................................................................................................................................................................... 2

3.2 General characteristics ..................................................................................................................................................................... 2

3.3 Chemical and physical properties .......................................................................................................................................... 2

4 General precautions .......................................................................................................................................................................................... 3

4.1 General ........................................................................................................................................................................................................... 3

4.2 Equipment precautions ................................................................................................................................................................... 3

5 Tank capacity table ............................................................................................................................................................................................ 4

5.1 General ........................................................................................................................................................................................................... 4

5.2 Contents of tank capacity table ................................................................................................................................................. 4

6 Level gauges ............................................................................................................................................................................................................... 4

6.1 Type of level gauges ............................................................................................................................................................................ 4

6.2 Accuracy of level gauge .................................................................................................................................................................... 4

6.3 Use of designated level gauge..................................................................................................................................................... 5

7 Temperature measuring equipment ............................................................................................................................................... 5

7.1 Type of temperature sensor ........................................................................................................................................................ 5

7.2 Accuracy of temperature measuring equipment ....................................................................................................... 5

7.3 Number and position of temperature sensors ............................................................................................................ 5

8 Pressure gauge ....................................................................................................................................................................................................... 5

8.1 Type and number of pressure gauges ................................................................................................................................. 5

8.2 Accuracy of pressure gauge ......................................................................................................................................................... 5

9 Preparation for custody transfer ......................................................................................................................................................... 6

9.1 Facilities for cargo operation ...................................................................................................................................................... 6

9.2 Pipelines ....................................................................................................................................................................................................... 6

9.3 Ship/shore meeting ............................................................................................................................................................................ 6

10 Custody transfer measurement ............................................................................................................................................................. 7

10.1 General ........................................................................................................................................................................................................... 7

10.2 Measurement of liquid level ........................................................................................................................................................ 7

10.3 Measurement of temperature .................................................................................................................................................... 7

10.4 Measurement of vapour pressure .......................................................................................................................................... 7

11 Quantitative calculation ................................................................................................................................................................................ 8

11.1 General ........................................................................................................................................................................................................... 8

11.2 Concept of quantitative calculation ....................................................................................................................................... 8

12 Preparation for sailing ................................................................................................................................................................................... 9

12.1 Pipelines and other facilities ....................................................................................................................................................... 9

12.2 Ship/shore meeting ............................................................................................................................................................................ 9

12.3 Information to cargo receiver .................................................................................................................................................... 9

Annex A (informative) Estimation of density of DME .......................................................................................................................10

Bibliography .............................................................................................................................................................................................................................11

© ISO 2012 – All rights reserved iii
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ISO 16384:2012(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International

Standards adopted by the technical committees are circulated to the member bodies for voting.

Publication as an International Standard requires approval by at least 75 % of the member bodies

casting a vote.

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.

ISO 16384 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants,

Subcommittee SC 5, Measurement of refrigerated hydrocarbon and non-petroleum based liquefied gaseous fuels.

iv © ISO 2012 – All rights reserved
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ISO 16384:2012(E)
Introduction

Measures for environmental protection are required on a global scale. In this connection, various

methods of achieving these aims have been independently studied or undertaken in many countries.

One such project, the development of the use of dimethylether (DME) as a new form of energy has been

undertaken in several countries. Use of DME generates neither sulfur-oxide nor any other particulate

matter known to cause environmental pollution at the time of combustion.

Another benefit of the use of DME as a petroleum alternative is that it can be produced easily from

natural gases, coals and biomasses with only slight additional development of the existing techniques of

production, transportation, storage and consumption.

In international trade, liquefied gases in bulk are carried by specialized ships which are equipped with

fully refrigerated or semi-refrigerated type tanks, or pressurized type tanks. For assessing the quantity,

measurement on board these ships is preferable because shore tanks at loading/discharging ports usually

engage in transferring to/from tank cars by pipelines, etc. simultaneously with the delivery/receipt of

the cargo to/from the ships.

To prevent dispute over the delivered quantity of DME, uniform practice of volumetric measurement

and consequent calculation methods is called for.

Since detailed requirements on installation, calibration and verification of level gauges and thermometers

are standardized in their own respective International Standards, this International Standard focuses

on the practice of custody transfer and subsequent calculation of DME.
© ISO 2012 – All rights reserved v
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INTERNATIONAL STANDARD ISO 16384:2012(E)
Refrigerated hydrocarbon and non-petroleum based
liquefied gaseous fuels — Dimethylether (DME) —
Measurement and calculation on board ships
1 Scope

This International Standard provides guidance on the practices for custody transfer of dimethylether

(DME) on board ships, at both the loading and the discharging ports. It covers such aspects of volumetric

calculation on board as measurement of liquid volume, vapour volume, temperature and pressure; and

accounting for the total quantity of DME on board before and after loading/discharging, regardless of

the type of ship’s tank.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
absolute pressure

pressure in excess of a perfect vacuum, equal to the algebraic sum of atmospheric pressure and

effective pressure
2.2
automatic tank gauge
ATG

instrument that continuously measures liquid height (dip or ullage) in storage tanks

[ISO 18132-1:2011, definition 2.1.1 and ISO 18132-3:2011, definition 2.1.1]

NOTE 1 An automatic tank gauge usually includes a level sensor, a gauge head and associated mounting

hardware, and in some cases local display.
NOTE 2 Automatic tank gauges are also known as automatic level gauges (ALGs).
2.2.1
float-type ATG
ATG that uses a float to detect the liquid level
[ISO 18132-1:2011, definition 2.1.5 and ISO 18132-3:2011, definition 2.1.4]

NOTE The float is guided by a tape or wire that is connected to a drum or a ratchet in the gauge head, where

the level measured is displayed locally and/or remotely.
2.2.2
magnetic-type ATG

ATG that measures the liquid level by magnetic reed switches with a float sensor including magnets, or

by magneto-strictive principle
[ISO 18132-3:2011, definition 2.1.7]
© ISO 2012 – All rights reserved 1
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ISO 16384:2012(E)
2.2.3
radar-type ATG
microwave-type ATG

ATG that utilizes an antenna to transmit electromagnetic continuous waves toward the liquid in a tank,

and to receive electromagnetic waves which are reflected at the surface of the liquid

[ISO 18132-1:2011, definition 2.1.7 and ISO 18132-3:2011, definition 2.1.8]
2.3
custody transfer

measurement of liquid level, liquid and vapour temperature, and vapour pressure of the DME to be

delivered to/from a tank, by which volume and other data are determined as the basis of payment or the

assessment of duty
2.3.1
closing custody transfer
custody transfer implemented after loading or discharging cargo from the tank(s)
2.3.2
opening custody transfer

custody transfer implemented before loading or discharging cargo from the tank(s)

2.4
heel
amount of cargo retained in a cargo tank prior to loading or after discharge
[ISO 10976:2012, definition 3.1.16]
2.5
saturated vapour pressure
vapour pressure

pressure exerted by the vapour above the liquid in equilibrium at a given temperature

3 Characteristics and properties of DME
3.1 General

DME has the following typical characteristics and properties (see ISO 29945), in consideration of which,

safety precautions should be taken.
3.2 General characteristics

DME has the following general characteristics, which should be considered with respect to personal

safety precautions:
a) non-corrosive;
b) relatively small temperature coefficient of volume expansion;
c) acts as an effective solvent of many materials;
d) hydrophilic.
3.3 Chemical and physical properties
DME has the following general chemical and physical characteristics:
a) boiling point: −25,1 °C at atmospheric pressure;
b) saturated vapour pressure: 0,61 MPa at 25 °C;
2 © ISO 2012 – All rights reserved
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ISO 16384:2012(E)
c) explosive range: 3,4 volume % to 27,0 volume %;
d) relative gas density: 1,59 relative to air;
e) liquid density: 677 kg/m at 15 °C.
4 General precautions
4.1 General

Nothing contained in this International Standard is intended to supersede any regulatory requirements

or recommended operating practices issued by organizations such as the International Maritime

Organization (IMO), International Chamber of Shipping (ICS), Oil Companies International Marine

Forum (OCIMF), International Association of Classification Societies (IACS) and individual operating

companies, nor is this International Standard intended to conflict with any safety or environmental

considerations, local regulations, or the specific provisions of any contract.
4.2 Equipment precautions
4.2.1 Accuracy inspection and verification of gauges

Level gauges, temperature measuring equipment and pressure gauges to be used for custody transfer

shall be subject to accuracy inspection at the time of installation on board and at subsequent periodic

inspections as required by regulation and/or the sales contract.

Certificates of these accuracy verifications shall document the inaccuracies of gauges and provide

statements with regard to their operational condition and suitability for use. They shall be dated and

indicate the person and company performing the verification. The most current cert

...

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