NEN EN 12493 : 2013 C1 2015

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Materials
    4.1 Suitability
    4.2 Pressure retaining parts
    4.4 Welding consumables
    4.5 Non-metallic materials
5 Tank design
    5.1 Design conditions
    5.2 Surge plates
    5.3 Doubler plates
    5.4 Stresses due to motion
    5.5 Self-supporting tanks
    5.6 Vacuum conditions
    5.7 Tank mountings
    5.8 Internal pipework
6 Openings
    6.1 General
    6.2 Reinforcement of openings
    6.3 Threaded connections
    6.4 Manhole
7 Non-pressure retaining parts
    7.1 Attachment welds
    7.2 Position of attachment welds
8 Workmanship and construction
    8.1 General
    8.2 Control of materials
    8.3 Acceptable weld details
    8.4 Heat treatment and forming
    8.5 Welding
    8.6 Post-weld heat treatment
    8.7 Manufacturing tolerances
    8.8 Repairs to pressure envelope and direct
         attachment welds
9 Construction and workmanship of internal pipework
10 Inspection and testing
    10.1 General
    10.2 Mechanical testing
    10.3 Non-destructive testing
    10.4 Non-destructive testing techniques for welds
    10.5 Qualification of non-destructive testing
         personnel
    10.6 Visual examination of welds
    10.7 Acceptance test criteria
    10.8 Pressure test
    10.9 Capacity
11 External corrosion protection and finishing
    11.1 External protection and finishing
    11.2 Finishing operations
12 Marking
13 Records and documentation
    13.1 Documentation obtained by the manufacturer
    13.2 Records prepared by the manufacturer
    13.3 Retention and supply of documents
Annex A (normative) Guidance on selection of material
        grades
Annex B (normative) Reference temperatures for design
      B.1 Introduction
      B.2 General
      B.3 Developed pressure
      B.4 Filling
Annex C (informative) Alternative reference temperatures
        for design
      C.1 Introduction
      C.2 General
      C.3 Developed pressure
      C.4 Filling
Annex D (normative) Design
      D.1 Design stresses
      D.2 Design pressure
      D.3 Design formulae
      D.4 Nozzle reinforcement
      D.5 Nozzle reinforcement by pads of flanges
      D.6 Nozzle reinforcement by branches
Annex E (informative) Example of joints
Annex F (normative) Allowable tolerances
      F.1 Tanks
      F.2 Dished end tolerance
      F.3 Assembly tolerances
      F.4 Attachments, nozzles and fittings
      F.5 Overall length
Annex G (normative) Heat treatment
      G.1 Method of post-weld heat treatment
      G.2 Temperature control
      G.3 Temperature limit
      G.4 Temperature measurement
Annex H (informative) Typical method for measurement
        of shell peaking
      H.1 Profile gauge
      H.2 Peaking survey
Annex I (normative) Welding imperfections and test
        specimens
      I.1 Imperfections
      I.2 Test specimens
Annex J (informative) Choice of non-destructive test
        methods for welds
      J.1 Internal imperfections
      J.2 Surface imperfections
Annex K (normative) Hydraulic pressure test
      K.1 Temporary fittings
      K.2 Pressure gauges
      K.3 Pressurising agent
      K.4 Avoidance of shock
      K.5 Applied pressure
Annex L (normative) Name plate
Bibliography

Defines minimum requirements for materials, design, construction and workmanship procedures, and tests for welded LPG road tanker pressure vessels and their welded attachments manufactured from carbon, carbon/manganese and micro alloy steels.