Utrustning för petroleum- och naturgasindustri

This document describes the metrological and technical requirements for flowmeters intended to be used in

the dynamic measurement of Liquefied Natural Gas (LNG) and other refrigerated hydrocarbon fluids.

This document sets the best practice for the proper selection and installation of flowmeters in cryogenic

applications and identifies the specific issues that can affect the performance of the flowmeter in use.

Moreover, it offers a calibration guideline for laboratory and on-site conditions (mass or volume) by either

using LNG or other reference fluids. The choice of calibration fluid will depend on the capabilities of available

flow calibration facilities and the ability to achieve the overall uncertainty demanded by the intended

application.

It is applicable, but is not limited to, the usage of Coriolis and ultrasonic flowmeters for dynamic measurements

of LNG.

In principle, LNG and other refrigerated liquid hydrocarbons are considered in the standard. Recommendations

in this standard are based on available test results with LNG. These results are probably applicable to other

cryogenic fluids.

This International Standard specifies procedures and requirements for the transfer of bunkers to vessels involving bunker tankers, road tankers and shore pipelines. It applies to pre-delivery, delivery and post-delivery checks and documentation.

This International Standard neither governs the legal rights of the parties involved nor supersedes applicable international conventions and/or local port legislation(s).

Local and international regulations, such as International Maritime Organization (IMO) regulation: International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978 relating thereto (MARPOL), Annex VI: Prevention of Air Pollution from Ships (hereinafter MARPOL 73/78), apply to all parties involved in the transfer of bunkers.