ONORM EN 12542 : 2010

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
   4.1 Shells and ends
   4.2 Pressure parts other than shells and ends
   4.3 Parts welded to the tank
   4.4 Welding consumables
   4.5 Certificates
   4.6 Non metallic materials (gaskets)
5 Design
   5.1 General
   5.2 Temperature
   5.3 Pressure
   5.4 Vacuum conditions
   5.5 Support loadings
   5.6 Lifting lugs loadings
   5.7 Text deleted
6 Openings
   6.1 General
   6.2 Reinforcement
   6.3 Position of welds and openings
7 Workmanship and manufacture
   7.1 General
   7.2 Control and traceability of materials
   7.3 Manufacturing tolerances
   7.4 Acceptable weld details
        7.4.1 Longitudinal welds
        7.4.2 Joggle joints
   7.5 Formed pressure parts
        7.5.1 General
        7.5.2 Heat treatment after forming
        7.5.3 Testing of formed parts
        7.5.4 Repeated tests
        7.5.5 Visual examination and dimensional check
        7.5.6 Marking
        7.5.7 Test certificate
   7.6 Welding
        7.6.1 General
        7.6.2 Welding procedure specification (WPS)
        7.6.3 Qualification of WPS
        7.6.4 Qualification of welders and welding personnel
        7.6.5 Preparation of edges to be welded
        7.6.6 Execution of welded joints
        7.6.7 Attachments and supports
        7.6.8 Preheating
   7.7 Post weld heat treatment
   7.8 Repairs
        7.8.1 Repairs of surface imperfections in the parent metal
        7.8.2 Repair of weld Imperfections
8 Non-pressure attachments
   8.1 Attachment
   8.2 Position
   8.3 Vent hole
9 Inspection and testing
   9.1 Visual examination of welds
   9.2 Non-destructive testing (NDT)
   9.3 Non-destructive testing techniques
        9.3.1 General
        9.3.2 Radiographic techniques
        9.3.3 Ultrasonic techniques
        9.3.4 Magnetic particle techniques
        9.3.5 Penetrant techniques
   9.4 Marking, all non-destructive testing techniques
   9.5 Qualification of personnel
   9.6 Acceptance criteria
   9.7 Production test plates (coupon plates)
   9.8 Final assessment
        9.8.1 Pressure test
        9.8.2 Final examination
10 Surface treatment and finishing
   10.1 General
   10.2 Reflectivity
   10.3 Finishing operations
11 Marking and certification
12 Records and documentation
   12.1 Records to be obtained by the manufacturer
   12.2 Documents to be prepared by the manufacturer
Annex A (normative) Design pressure and filling conditions
      A.1 Design pressure (p)
      A.2 Filling conditions
      A.3 Calculation of maximum fill
Annex B (normative) Tolerances on tanks
      B.1 Mean external diameter
      B.2 Out of roundness
      B.3 Deviation from the straight line
      B.4 Irregularities in circular profile
      B.5 Dished end tolerance
      B.6 Profile
      B.7 Surface alignment
      B.8 Attachments, nozzles and fittings
Annex C (normative) Hydraulic pressure test
      C.1 Temporary fittings
      C.2 Pressure gauges
      C.3 Pressurising agent
      C.4 Avoidance of shocks
      C.5 Test procedure
Annex D (normative) Imperfections
Annex E (normative) Design formulae for tanks
      E.1 Allowable stresses
      E.2 Design formulae
          E.2.1 General
          E.2.2 Cylindrical shell calculation
          E.2.3 Torispherical end calculation
          E.2.4 Ellipsoidal end calculation
          E.2.5 Hemispherical ends
          E.2.6 Equations for calculating C
      E.3 Nozzle re-enforcement
          E.3.1 General
          E.3.2 Size of openings
          E.3.3 Distance between openings or branches
          E.3.4 Openings and branches
          E.3.5 Cylindrical shells and dished ends with openings
          E.3.6 Shell reinforcement
          E.3.7 Extent of reinforcement
          E.3.8 Elliptical openings
          E.3.9 Welded branches
          E.3.10 Compensating plates
          E.3.11 Reinforcement-General
          E.3.12 Reinforcement by pads
          E.3.13 Reinforcement by branches
          E.3.14 Branch connections normal to the tank wall
Annex F (informative) Measurement of shell peaking
      F.1 Profile gauge
      F.2 Peaking survey
Annex G (informative) Examples of joints
Annex H (informative) Method for determining reflectivity
        indices
      H.1 Method
Annex ZA (informative) Clauses of this European Standard
         addressing essential requirements or other provisions
         of EU Directives
Bibliography

Specifies requirements for the design and manufacture of static welded steel cylindrical tanks, serially produced for the storage of liquefied petroleum gas (LPG) with a volume not greater than 13 m[3] and for installation above ground.