Japanese classification society Nippon Kaiji Kyokai (ClassNK) in late December released its Guideline for Survey and Facilities/Equipment of liquified natural gas (LNG) Bunkering Ships, which outline the additional safety requirements of liquefied gas carriers that supply LNG fuel at sea.
The number of LNG-fueled ships has been increasing in recent years as their CO2, SOx, and NOx emissions have a lower environmental load compared to ships that use conventional oil fuels, noted ClassNK.
On the other hand, the facilities that supply LNG as fuel from quay facilities to general ships are still limited.
Liquefied gas carriers supplying LNG fuel at sea are considered candidates for ensuring variations in fuel supply, and more liquefied gas carriers (LNG bunkering ships) that supply LNG to ships are also being built and operated.
There are currently no established international conventions for the facilities/equipment of ships that transfer LNG to other ships at sea, and additional safety equipment has been considered individually.
Based on the examinations conducted so far, ClassNK has developed its guideline which compiles the requirements for additional equipment for the safe transfer of LNG, a cryogenic substance, between ships, and surveys.
The guideline stipulates the layout and system design of LNG bunkering ships, fuel transfer systems, and operation, as well as class notations according to the equipment to be installed.
The guide is available to download here for those who have registered for the ClassNK’s “My Page” service which is free of charge.
Photo credit: ClassNK
Published: 5 January, 2021
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