Library / GUIDE FOR THE ESTABLISHMENT AND OPERATIONS OF DOWNSTREAM GAS FACILITIES IN NIGERIA (LPG, CNG, LNG) ISSUED BY

GUIDE FOR THE ESTABLISHMENT AND OPERATIONS OF DOWNSTREAM GAS FACILITIES IN NIGERIA (LPG, CNG, LNG) ISSUED BY

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Applicable to all Oil & Gas Operators
GUIDELINES FOR THE ESTABLISHMENT AND OPERATIONS OF GAS
STORAGE AND UTILISATION FACILITIES IN NIGERIA
Code: DPR Guide 0020 - 2020

Revision Date: 1st September 2020

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3.4.5 Requirements for LNG tanks
In addition to the requirements for tanks listed in Section 3.4, the following are applicable
to LNG tanks:
i. All tanks for the storage of LNG shall be designed for a working pressure
corresponding to the vapour pressure and at the maximum ambient/ minimum
temperature that the tanks are likely to reach.
ii. All LNG tank systems shall be designed for both top and bottom filling.
iii. The tank must possess devices for measuring the liquid content and its
temperature. The maximum quantity of LNG filled into any tank shall be such that
the maximum operating volume it would occupy should not be more than 95% of
the capacity of the storage.
iv. Remote controlled hydraulically operated shut-off valves shall be fitted to each
storage tank system.
v. Excess flow valve shall be fitted to prevent the loss of LNG from storage tanks,
transport tanks and points where flexible hoses are used.
vi. Vacuum insulated storage tanks shall be considered for use for LNG facilities.
vii. Storage vessels shall be installed aboveground only and on stable, non-combustible
foundations outdoors in the open air in a position that will not allow accumulation
of LNG vapour at ground level. They should never be installed in or on buildings or
in open pits.
viii. Fuel degradation in storage shall be considered when determining the size of
storage containment. Design shall, where practical, include measures to promote
a longer storage life, for example, the reduction of heat gain and boil-off.
ix. There shall be some means of isolation in the pipework between the fuel storage
vessel and the fuel delivery point.
x. Exposed insulation shall be non-combustible, shall contain or inherently be a