DNV GL issues LNG quality measurement guidance
Class society DNV GL has issued what it believes is the first industry guidance on how to perform quality measurements and quantity metering of LNG fuel supply.
The updated recommended practice (RP) document for the development and operation LNG bunkering facilities includes a section on determining LNG quantity and its properties. DNV GL said the objective is to assist operators in addressing the large spread in properties, density and calorific value among the LNG sources worldwide.
Martin Layfield, global segment leader of the gas value chain, DNV GL, said: “The specification of LNG as a marine fuel and required metering methodology has until now been a missing piece in the puzzle. This new RP completes the picture and will provide a level playing field for the billing process of LNG and documentation around gas quality.”
Gas from different sources with various compositions can result in substantial variation in energy content and burning properties. This may have implications for billing, the expected voyage distance and safe use in terms of operations.
The RP – which also contains sections on safe design and operation, safety management systems and risk assessments - is applicable to truck-to-ship, terminal-to-ship and ship-to-ship bunkering scenarios, as well as inland shipping and vessels not covered by the International Maritime Organization (IMO) regulations. It is in accordance with, and builds on, ISO/TS 18683 guidelines for systems and installations for supply of LNG as fuel to ships, with a focus on bridging the gap between the rules for the receiving ship and the bunker supplier.
“The updated RP also elaborates further on how to establish proper safety zones including guidance on techniques and risk methodologies,” added Layfield. Risk evaluations for planning an LNG bunkering facility project are also included.
The risk evaluation guidance follows the establishment of an ongoing joint industry project, launched last year, in which DNV GL is aiming to understand the risks in small-scale bunkering stations, with a view to more rigorous standards in the design, location, construction and operation of these facilities.
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