1 General provisions
1.0.1 This code is formulated with a view to rationally designing the fire dikes and safety walls and ensuring the safety of storage tank farms.
1.0.2 This code is applicable to the design of fire dikes and safety walls in constructed, renovated and extended projects in above-ground liquid storage tank farm.
1.0.3 For the design of fire dikes and safety walls, measures shall be tailored to suit local conditions and models shall be reasonably selected based on meeting technical requirements, so as to achieve safe, durable, economical and reasonable results.
1.0.4 The design of fire dikes and safety walls in the storage tank farm shall not only comply with this code, but also meet the requirements of the current relevant standards of the nation.
2 Terms
2.0.1
tank group
storage tank unit consisting of one or several storage tanks surrounded by fire dikes or safety walls
2.0.2
storage tank farm
storage tank area consisting of one or several tank groups
2.0.3
fire dike
structure used to prevent liquid outflow and fire spread in case of leakage accidents of flammable and combustible liquid tank groups at normal pressure, tank groups that change gas into liquid at normal pressure by means of low temperature or other liquid dangerous goods tank groups
2.0.4
dividing dike
structure used to divide a tank group into several zones for the purpose of reducing the impact range of a small amount of liquid leakage of storage tanks in a fire dike, or reducing that of a small amount of frozen liquid leakage of a tank group which changes gas into liquid at normal pressure by means of low temperature
2.0.5
safety wall
structure used to prevent the sinking gas from overflowing in case of leakage accident of tank groups which change gas into liquid at normal temperature by means of pressurization
2.0.6
dividing wall
structure used to divide a tank group into several zones for the purpose of reducing the impact range of a small amount of liquid leakage of storage tanks in the safety walls before the liquid becomes gas
2.0.7
effective capacity surrounded by dikes
capacity that may be effectively utilized within the fire dike of a tank group
2.0.8
design height of liquid level
design height of liquid level in a fire dike in case of calculating the effective capacity of the fire dike
2.0.9
inboard toe line of dike
intersection line between the inner side of a fire dike or its side slope and the designed ground in the fire dike
2.0.10
outboard toe line of dike
intersection line between the outer side of a fire dike or its side slope and the designed ground outside the fire dike
Foreword i
1 General provisions
2 Terms
3 Arrangement of fire dikes and safety walls
3.1 General requirements
3.2 Tank group’s fire dike arrangement
3.3 Arrangement of fire dikes and safety walls for liquefied petroleum gas, natural gas liquids, liquefied natural gas and other tank groups
4 Selection and details of fire dikes
4.1 Selection
4.2 Details
5 Strength calculation and stability checking of fire dikes
5.1 Combination of load effects and seismic effect
5.2 Calculation of load, seismic action and internal forces
5.3 Strength calculation
5.4 Stability checking
Annex A Table of earth pressure coefficients
Annex B Friction coefficient of fire dike base
Explanation of wording in this code
List of quoted standards
