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NEN EN 14015 : 2004
Current
The latest, up-to-date edition.
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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
12-01-2013
Foreword
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
3.2 Symbols
3.3 Abbreviations
4 Information and requirements to be documented
4.1 Information to be specified by the purchaser
4.2 Information to be agreed between the purchaser and
the tank manufacturer
4.3 Information to be supplied by the tank manufacturer
4.4 Information to be supplied by the steel manufacturer
4.5 Information to be agreed between the steel manufacturer
and the tank manufacturer
4.6 Information to be agreed between the purchaser and the
cover supplier
4.7 Information to be agreed between the tank manufacturer
and the cover supplier
4.8 Information to be supplied by the cover supplier
5 Requirements
5.1 Design pressure
5.2 Design metal temperature
5.3 Design density
5.4 Yield strength
6 Materials
6.1 Carbon and carbon manganese steels
6.2 Stainless steels
7 Design loads
7.1 Loads
7.2 Load values
7.3 Load combinations
8 Tank bottoms
8.1 General
8.2 Materials
8.3 Design
8.4 Fabrication
9 Shell design
9.1 Design and test stress
9.2 Internal loads
9.3 Wind and vacuum loads
9.4 Shell plate arrangement
9.5 Shell joints
10 Fixed roof design
10.1 Loads
10.2 Type of roof
10.3 Roof plating with supporting structure
10.4 Roof plating without supporting structure (membrane
roofs)
10.5 Compression area at the junction of the shell and
roof
10.6 Venting requirements
10.7 Floating covers
11 Floating roof design
12 Tank anchorage
12.1 General
12.2 Anchorage attachment
12.3 Holding down bolt or strap
12.4 Resistance to uplift during test
13 Mountings
13.1 Shell nozzles O/D 80 mm and above
13.2 Shell nozzles less than O/D 80 mm
13.3 Roof nozzles
13.4 Studded pad connections
13.5 Nozzle loads
13.6 Flush type clean-out doors and water draw-off sumps
13.7 Nozzle welding details
13.8 Flange drilling
13.9 Post-weld heat treatment of nozzles
13.10 Heating and/or cooling systems
13.11 Stairways and walkways
13.12 Handrailing
13.13 Ladders
13.14 Earthing connections
13.15 Permanent attachments
13.16 Temporary attachments
14 Insulation
15 Shop fabrication of tank components
15.1 General
15.2 Reception and identification of materials
15.3 Handling and storage of materials
15.4 Material markings
15.5 Plate preparation and tolerances
15.6 Preparation of nozzle components
15.7 Plate forming and tolerances
15.8 Openings
15.9 Welding
15.10 Surface condition
15.11 Marking for erection purposes
15.12 Packing, handling and transport to site
16 Site erection and tolerances
16.1 General
16.2 Foundations
16.3 Anchor points
16.4 Handling and storage
16.5 Rectification of parts damaged during transportation
and handling
16.6 Bottom plates
16.7 Shell to bottom, and shell
16.8 Fixed roofs
16.9 Nozzles
16.10 External attachments
16.11 Internal attachments
16.12 Temporary attachments
17 Approval of welding procedures and welders
17.1 General
17.2 Welding procedure approval
17.3 Welding Procedure Approval Record (WPAR)
17.4 Welders and welding operators approval
17.5 Production control test plates
18 Welding
18.1 General
18.2 Welding sequences
18.3 Welding of bottoms
18.4 Welding of shell to bottom
18.5 Welding of shell
18.6 Welding of roof
18.7 Temporary welds
18.8 Atmospheric conditions
18.9 Preheating
18.10 Post-weld heat treatment
18.11 Repair welding
19 Testing and inspection
19.1 General
19.2 Qualification of NDT personnel
19.3 Test procedures
19.4 Type of inspections and examinations
19.5 Vacuum box test
19.6 Penetrant test
19.7 Magnetic particle examination
19.8 Soap bubble examination
19.9 Radiographic examination
19.10 Ultrasonic examination
19.11 Acceptance criteria
19.12 Dimensional check
19.13 Hydrostatic and pneumatic tests
19.14 Empty checks
19.15 Accessories
20 Documentation and name-plate
20.1 Documentation
20.2 Name-plate
Annex A (normative) Information and requirements to be
documented
A.1 Information to be supplied by the purchaser
A.2 Information agreed between the purchaser and the
manufacturer
A.3 Information to be supplied by the manufacturer
A.4 Information to be supplied by the steel manufacturer
A.5 Information to be agreed between the steel manufacturer
and the tank manufacturer
A.6 Information to be agreed between the purchaser and the
cover supplier
A.7 Information to be agreed between the tank manufacturer
and the cover supplier
A.8 Information to be supplied by the cover supplier
Annex B (informative) Operational and safety considerations for
storage tanks and storage installations
B.1 General
B.2 Tank type
B.3 Health, safety and environmental considerations
B.4 Attachments to tanks for safety or firefighting
facilities
Annex C (normative) Requirements for floating covers
C.1 General
C.2 Types of floating covers
C.3 Design and construction requirements
C.4 Installation
C.5 Documentation
Annex D (normative) Requirements for floating roofs
D.1 General
D.2 Roof types
D.3 Design
D.4 Prefabrication in the workshop
D.5 Marking, packing, handling, transport
D.6 Assembly
D.7 Welding
D.8 Inspection and testing
D.9 Documentation
Annex E (normative) Requirements for rim seals for floating
roofs
E.1 General
E.2 Design
E.3 Seal types
E.4 Weather shields
E.5 Application and technical details of rim seals
E.6 Installation
Annex F (normative) Selection of carbon and carbon manganese
steel plate to alternative specifications
to those in 6.1
F.1 Alternative national standards
F.2 General
F.3 Chemical composition
F.4 Mechanical properties
F.5 Impact testing
Annex G (informative) Recommendations for seismic provisions for
storage tanks
G.1 General
G.2 Design loads
G.3 Resistance to overturning
G.4 Shell compression
G.5 Anchorage of tanks
G.6 Piping
G.7 Sloshing height
Annex H (informative) Recommendations for other types of tank
bottoms (double bottoms, elevated bottoms
etc.)
H.1 Non-fully supported bottoms
H.2 Double bottoms
H.3 Elevated or beam supported tanks
H.4 Leak test
Annex I (informative) Recommendations for tank foundations
I.1 General
I.2 Soil Investigation
I.3 Foundation design
I.4 Types of foundations
Annex J (informative) Example calculations of stiffening rings
(wind girders)
J.1 General
J.2 Section moduli
J.3 Worked examples of design of secondary stiffening rings
(wind girders)
J.4 Example 1
J.5 Example 2
Annex K (normative) Design rules for tanks with frangible roof to
shell joints
K.1 General
K.2 Construction
K.3 Materials
K.4 Design rules
Annex L (normative) Requirements for venting systems
L.1 General
L.2 Types of vents and valves
L.3 Calculation of maximum flow rates for normal outbreathing
and inbreathing
L.4 Calculation of maximum flow rates for emergency pressure
venting
L.5 Emergency vacuum venting
L.6 Testing venting devices
L.7 Manufacturers documentation and marking of venting devices
Annex M (informative) Tank anchorages
M.1 General
M.2 Holding down strap
M.3 Holding down bolt with individual chair
M.4 Holding down bolt with continuous support ring
Annex N (informative) Weld details for the connection of mounting
N.1 Set-through mountings
N.2 Set-on mountings
N.3 Studded pad connections
Annex O (informative) Flush-type clean-out doors and water
draw-off sumps
O.1 Flush-type clean-out doors
O.2 Water-draw-off sumps
O.3 Combined water draw-off and clean-out sump
Annex P (informative) Heating and/or cooling systems
P.1 General
P.2 Heat transfer fluid
P.3 Type of heating or cooling devices
P.4 Installation
Annex Q (informative) Recommendations for the design and
application of insulation
Q.1 General
Q.2 Design considerations
Q.3 Mechanical support arrangement
Q.4 Design details
Q.5 Corrosion protection
Q.6 Insulation
Q.7 Cladding
Q.8 Securing insulation materials
Q.9 Fire hazard
Annex R (normative) Surface finish
R.1 Internal surfaces in contact with the product
R.2 External surfaces
Bibliography
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