ISO 16384:2012 冷蔵炭化水素および非石油ベースの液化ガス燃料—ジメチルエーテル（DME）—船上での測定と計算 | ページ 2

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.

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.

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.

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