Design and manufacture of site built, vertical, cylindrical flat-bottomed steel tanks for the storage of liquefied nature gases - Part 2: Metallic components
Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of liquefied natural gases - Part 2: Metallic components
1 Scope
This standard specifies general requirements for the materials, design, manufacture and installation of the metallic components of tanks for the storage of liquefied natural gases (LNG).
This standard deals with the design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of liquefied natural gases with operating temperatures between 0℃ and -165℃.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 193-2003 General purpose metric screw threads - General plan
GB/T 9145-2003 General purpose metric screw threads - Limits of sizes for the screw threads of medium quality and preferable plan
GB/T 26978.1-2011 Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of liquefied natural gases - Part 1: General
SY/T 0608-2006 Design and construction of large, welded, low-pressure storage tanks
EN ISO 5817: 2003 Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections
EN ISO 15607: 2003 Specification and qualification of welding procedures for metallic materials - Part 1 :General rules
EN ISO 15609-1: 2004 Specification and qualification of welding procedures for metallic materials - Welding procedure specification - Part 1: Arc welding
EN ISO 15614-1: 2004 Specification and qualification of welding procedures for metallic materials - Welding procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
EN 287-1 Qualification test of welders - Fusion welding - Part 1: Steels
EN 462-1 Non-destructive testing - Image quality of radiographs - Part 1: Image quality indicators (wire type) - Determination of image quality value
EN 462-2 Non-destructive testing - Image quality of radiographs - Part 2: Image quality indicators (step/hole type) - Determination of image quality value
EN 473 Non-destructive testing - Qualification and certification of NDT personnel - General principles
EN 571-1 Non-destructive testing - Penetrant testing - Part 1: General principles
EN 584-1 Non-destructive testing - Industrial radiographic film - Part 1: Classification of film systems for industrial radiography
EN 584-2 Non-destructive testing - Industrial radiographic film - Part 2: Control of film processing by means of reference values
EN 875 Destructive tests on welds in metallic materials - Impact tests - Test specimen location, notch orientation and examination
EN 970 Non-destructive examination of fusion welds - Visual examination
EN 1011-2 Welding - Recommendations for welding of metallic materials- Part 2: Arc welding of ferritic steels
EN 1092-1: 2001 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges
EN 1290 Non-destructive testing of welds - Magnetic particle testing of welds
EN 1418 Welding personnel - Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials
EN 1435: 1997 Non-destructive examination of welds - Radiographic examination of welded joints
EN 1515-1: 1999 Flanges and their joints - Bolting - Part 1: Selection of bolting
EN 1593 Non-destructive testing - Leak testing - Bubble emission techniques
EN 1712: 1997 Non-destructive testing of - welds - Ultrasonic testing of welded joints - Acceptance levels
EN 1714: 1997 Non-destructive testing of welds - Ultrasonic testing of welded joints
EN 1759-1: 2004 Flanges and their joint - Circular flanges for pipes, valves, fittings and accessories, Class designated - Part 1: Steel flanges, NPS 1/2 to 24
EN 1993-1-1 Eurocode 3: Design of steel structures - Part 1-1: General rules and rules for buildings
ENV 1993-1-6 Eurocode 3: Design of steel structures - Part 1-6: General rules - Supplementary rules for the strength and stability of shell structures
ENV 1993-4-2: 1999 Eurocode 3: Design of steel structures - Part 4-2: Silos, tanks and pipelines - Tanks
EN 1994-1-1 Eurocode 4: Design of composite steel and concrete structures - Part 1-1: General rules and rules for buildings
EN 10025: 2004 Hot rolled products of non-alloy structural steels
EN 10029: 1991 Hot rolled steel plates 3mm thick or above - Tolerances on dimensions, shape and mass
EN 10045-1 Metallic materials - Charpy impact test - Part 1: Test method
EN 10160: 1999 Ultrasonic testing of steel flat product of thickness equal or greater than 6mm
EN 10204: 2004 Metallic products - Types of inspection documents
EN 10216-1 Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 1: Non-alloy steel tubes with specified room temperature properties
EN 10216-2 Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10216-3 Seamless steel tubes for pressure purposes - Technical delivery conditions Part 3: Alloy fine grain steel tubes
EN 10216-4 Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 4: Non-alloy and allow steel tubes with specified low temperature properties
EN10217-1 Welded steel tubes for pressure purposes - Technical delivery conditions - Part 1: Non-alloy steel tubes with specified room temperature properties
EN 10217-2 Welded steel tubes for pressure purposes - Technical delivery conditions - Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-3 Welded steel tubes for pressure purposes - Technical delivery conditions - Part 3: Alloy fine grain steel tubes
EN 10217-4 Welded steel tubes for pressure purposes - Technical delivery conditions - Part 4: Electric welded non-alloy steel tubes with specified low temperature properties
EN 10217-5 Welded steel tubes for pressure purposes - Technical delivery conditions - Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-6 Welded steel tubes for pressure purposes - Technical delivery conditions - Part 6: Submerged arc welded non-alloy steel tubes with specified low temperature properties
EN 10220 Seamless and welded steel tubes - Dimensions and masses per unit length
EN 12062: 1997 Non-destructive examination of welds - General rules for metallic materials
EN 14015: 2004 Specification for the design and manufacture of site built, vertical, cylindrical, flat-bottomed, above ground, welded, steel tanks for the storage of liquids at ambient temperature and above
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 26978.1-2011 and the following apply.
3.1
amplitude of strain
one half of the range of strains
3.2
progressive deformation
phenomenon in which the deformations in each part of the membrane increase progressively under the cyclic loads
3.3
range of strain
difference between the maximum and minimum values in the cyclic strain curves
3.4
ratcheting
progressive incremental inelastic deformation or strain, which can occur in a component that is subject to variation of mechanical stress
3.5
unstable collapse
phenomenon in which the assessment of the process of deformation under static load becomes ambiguous
4 Materials
4.1 General
The temperature to which the steel may be exposed under all conditions is important, and shall be determined.
4.2 Temperatures
4.2.1 Minimum design temperature
The minimum design temperature shall be used as the design metal temperature for material selection of the primary and secondary liquid container.
4.2.2 Meteorological data
The purchaser shall specify the meteorological data (lodmat, daily, monthly and annual temperature records).
4.2.3 Design metal temperature
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
4.1 General
4.2 Temperatures
4.2.1 Minimum design temperature
4.2.2 Meteorological data
4.2.3 Design metal temperature
4.3 Primary and secondary liquid container
4.3.1 Steel selection
4.3.2 Charpy V-notch impact test requirements
4.3.3 Certification
4.4 Vapor container/outer tank
4.4.1 Material for plate and structural sections
4.2.2 Certification
4.5 Other components
4.5.1 Bolting
4.5.2 Mountings
4.5.3 Piping components
5 Design
5.1 Design theory
5.1.1 General
5.1.2 Allowable stresses
5.1.3 Limit state theory
5.2 Primary and secondary liquid container
5.2.1 Single, double and full containment tanks
5.2.2 Membrane tanks
5.3 Vapor container (outer tank)
5.3.1 Single, double and full containment tanks
5.3.2 Membrane tank
5.4 Suspended roof
5.5 Nozzles
5.5.1 General
5.5.2 Nozzle loads
5.5.3 Shell nozzles
5.5.4 Shell nozzle welding details
5.5.5 Roof nozzles
5.5.6 Flange drilling
5.5.7 Post-weld heat treatment of nozzles
5.6 Primary and secondary containers, bottom connections
5.7 Connections between containers
5.8 Other details
5.8.1 Tank anchorage
5.8.2 Name-plate
6 Fabrication
6.1 Handling of materials
6.2 Plate preparation and tolerances
6.2.1 Shell plates
6.2.2 Annular plates
6.2.3 Nozzles
6.2.4 Reinforcement plates
6.3 Tolerances
6.3.1 Foundation peripheral tolerances
6.3.2 Other foundation surface tolerances
6.3.3 Bottom plate tolerances
6.3.4 Shell to bottom connection
6.3.5 Ovality
6.3.6 Local deformation in plates
6.3.7 Local deformation at welds
6.3.8 Vertical tolerance
6.3.9 Tolerances on alignment of plates
6.3.10 Tolerance for membrane system
6.4 Roof
6.5 Temporary attachments
7 Welding procedures
7.1 General
7.2 WPAR requirements
7.3 Impact testing
7.4 9% nickel steel
7.5 Welders and welding operators
7.5.1 Single, double and full container tanks
7.5.2 Membrane tanks
7.6 Production test plates
7.6.1 Single, double and full containment tanks
7.6.2 Membrane tanks
8 Welding
8.1 Tack and temporary welds
8.2 Atmospheric conditions
8.3 Preheating
8.4 Post-weld heat treatment
9 Inspection
9.1 Qualification of NDE personnel
9.2 Inspection procedures
9.3 Type of inspections
9.3.1 Inspection of materials
9.3.2 Extent of weld inspections
9.4 Visual inspection
9.5 Dye penetrant examination
9.6 Magnetic particle examination
9.7 Vacuum box examination
9.8 Ammonia tightness test
9.9 Soap bubble examination
9.9.1 General
9.9.2 Shell to bottom with double fillet weld
9.9.3 Reinforcement plates
9.9.4 Roof
9.10 Radiographic examination
9.11 Ultrasonic examination
9.12 Acceptance criteria
9.12.1 Radiographic examination
9.12.2 Ultrasonic inspection
9.13 Unacceptable defects in horizontal welds
9.13.1 General
9.13.2 Automatic welding
9.13.3 Manual welding
9.14 Acceptable thinning after grinding
Annex A (Informative) Loads on membrane
Annex B (Informative) Determination of the load and fatigue curves for membrane
Annex NA (Informative) Technical differences between this part and EN 14620-2:2006 and their causes
Bibliography
