BS 7777-2:1993

Committees responsible
Foreword
Specification
1 Scope
2 References
2.1 Normative references
2.2 Informative references
3 Definitions
4 Design conditions
5 Information to be exchanged between the purchaser
       and the contractor
5.1 Information to be supplied by the purchaser
5.2 Optional and alternative information to be
       supplied by the purchaser
5.3 Information to be agreed between the purchaser
       and the contractor
6 Materials
6.1 Materials for inner or outer tank designed to
       contain refrigerated liquid
6.2 Steel for outer tanks and outer containers
7 Design of components for single containment tank
7.1 Steel outer container of double shell single
       containment tank
7.2 Inner tank of double shell single containment
       tank
7.3 Steel single shell single containment tank for
       temperatures down to - 50 deg C
8 Design of components for double containment tanks
8.1 Inner tank of double containment tank
8.2 Steel outer tank of double containment tank
9 Design of components for full containment tank
9.1 Inner tank of full containment tank
9.2 Steel outer tank of full containment tank
10 Shop fabrication of tank containment tank
10.1 Workmanship
10.2 Flattening
10.3 Hard stamping
10.4 Plate edge preparation
10.5 Rolling and pressing
10.6 Shell nozzles and manholes
10.7 Bolt holes
10.8 Shop painting
10.9 Erection marks
10.10 Packaging and identification
10.11 Handling and transport
11 Site erection of tank components
11.1 General
11.2 Workmanship
11.3 Foundations
11.4 Rectification of materials damaged prior to
       erection
11.5 Erection of plates
11.6 Inner tank and outer tank or container erection
       tolerances
11.7 Manual cutting of plates
11.8 Protection of shell during erection
11.9 Erection of tank roof
11.10 Erection holes
11.11 Welding
11.12 Welding procedure approval and welder approval
11.13 Non-destructive testing
12 Pressure testing of both inner and outer tank
12.1 Hydrostatic testing
12.2 Pneumatic testing
13 Insulation
14 Foundations
15 Internal positive and internal negative pressure
       relief
16 Commissioning and decommissioning
17 Name plate
Annexes
A (informative) Guidance for the determination of
       delta T-shift for the impact testing of steels
B (informative) Guidance for the tensile testing of
       9 % nickel steel weld metal using strain-gauged
       tensile specimens
C (informative) Guidance for the use of aluminium
       and aluminium alloys for liquid containing tanks
D (informative) Worked example of stiffener design
       for a fixed-roof container
Tables
1 References list of metal components for single,
       double and full containment tanks
2 Material types for tank shell and bottom
3 Longitudinal Charpy V-notch impact testing
4 Maximum shell plate thickness
5 Weld metal Charpy V-notch impact testing
6 Steels for outer tank compression area, roof and
       roof structure where the minimum design
       temperature is based on ambient temperature
7 Steel for outer containers for single containment
       tanks
8 Container nominal shell plate thickness
9 Manhole and nozzle body thickness
10 Minimum thickness of annular plate
11 Determination of the maximum allowable design
       stress
12 Minimum shell plate thickness
13 Manhole and nozzle body thickness
14 Tank radius erection tolerances
15 Tank shell profile tolerances
A.1 Test plate welding characteristics
C.1 Aluminium alloy bolting materials
C.2 Manhole and shell nozzle thickness
Figures
1 Typical bottom layout for tank or container
2 Typical cross joints in bottom plates where three
       thicknesses coincide
3 Typical sketch plate joint under shell plates for
       tank of container without annular plates
4 Typical annular plate joint under shell plates
       for tank or container with annular plates
5 Shell stiffeners
6 Shell-roof compression areas
7 Shell-insert-type reinforcement
8 Barrel-type nozzle reinforcement
9 Graph for the determination of the thickness of a
       barrel-type nozzle reinforcement
10 Flanged roof nozzles
11 Weld details for connection of mountings: set-
       through type when t = 20 mm maximum and tp = 12.5
       mm maximum (preferred details)
12 Weld details for connection of mountings: set-
       through type when t = 20 mm maximum and tp = 12.5
       mm maximum (preferred details)
13 Weld details for connection of mountings: set-
       through type when 20 mm < or = t < or = 40 mm
       (preferred details)
14 Weld details for connection of mountings: set-
       through type when ti > 40 mm (preferred details)
15 Weld details for connection of mountings: set-
       through type (alternative details)
16 Weld details for connection of mountings:
       compensated set-through type (preferred details)
17 Weld details for connection of mountings:
       compensated set-through type (alternative
       details)
18 Weld details for connection of mountings: set-on
       type
19 Standard weld details for connection of mountings
20 Reinforcement details for low-type nozzles
21 Details of weld overlay for nozzles
22 Treads welded to roof plates
23 Typical detail of earthing boss site-welded to
       shell plates
24 Detail of stiffening ring radial joint
25 Typical shell and roof opening with expansion/
       contraction device
26 Typical shell and roof opening with flexible loop
27 Location of Charpy V-notch impact energy test
       specimen
A.1 Details of test plate
A.2 Typical multi-run weld
A.3 Location of Charpy V-notch impact energy test
       specimens
A.4 Temperature shift (delta T) at the 27 J toughness
       level
B.1 Dimensions of tensile test specimen
B.2 Method of attaching strain gauges
B.3 Test circuit
List of references

Specifies requirements for the materials, design, fabrication inspection testing of metal components of single, double and full containment storage tanks.