kSIST FprEN 12493:2020

SLOVENSKI STANDARD
oSIST prEN 12493:2019
01-oktober-2019

Oprema in pribor za utekočinjeni naftni plin (UNP) - Varjene tlačne posode cestnih

LPG equipment and accessories - Welded steel pressure vessels for LPG road tankers -

Équipements pour GPL et leurs accessoires - Réservoirs sous pression en acier soudés

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Équipements pour GPL et leurs accessoires - Flüssiggas-Geräte und Ausrüstungsteile - Geschweißte

Réservoirs sous pression en acier soudés des camions- Druckbehälter aus Stahl für Straßentankwagen für

citernes pour GPL - Conception et construction Flüssiggas (LPG) - Auslegung und Herstellung

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12493:2019 E

European foreword ....................................................................................................................................................... 6

Introduction .................................................................................................................................................................... 7

1 Scope .................................................................................................................................................................... 8

2 Normative references .................................................................................................................................... 8

3 Terms and definitions ................................................................................................................................ 10

4 Materials .......................................................................................................................................................... 11

4.1 Environmental............................................................................................................................................... 11

4.2 Suitability ........................................................................................................................................................ 11

4.3 Pressure retaining parts ............................................................................................................................ 11

4.4 Non-pressure retaining parts .................................................................................................................. 11

4.5 Welding consumables ................................................................................................................................. 11

4.6 Non-metallic materials (gaskets) ........................................................................................................... 12

4.7 Inspection documents for materials ..................................................................................................... 12

5 Pressure vessel design ............................................................................................................................... 12

5.1 Design conditions ......................................................................................................................................... 12

5.2 Minimum thickness ..................................................................................................................................... 12

5.3 Surge plates .................................................................................................................................................... 13

5.4 Doubler plates ............................................................................................................................................... 13

5.5 Stresses due to motion ............................................................................................................................... 13

5.6 Self-supporting pressure vessels............................................................................................................ 14

5.7 Vacuum conditions ...................................................................................................................................... 14

5.8 Pressure vessel mountings ....................................................................................................................... 14

5.9 Internal pipework ........................................................................................................................................ 14

6 Openings .......................................................................................................................................................... 14

6.1 General ............................................................................................................................................................. 14

6.2 Reinforcement of openings....................................................................................................................... 15

6.3 Threaded connections ................................................................................................................................ 15

6.4 Manhole ........................................................................................................................................................... 15

7 Non-pressure retaining parts .................................................................................................................. 15

7.1 Attachment welds ........................................................................................................................................ 15

7.2 Position of attachment welds .................................................................................................................. 15

8 Workmanship and construction ............................................................................................................. 15

8.1 General ............................................................................................................................................................. 15

8.2 Environment .................................................................................................................................................. 16

8.3 Control of materials..................................................................................................................................... 16

8.4 Acceptable weld details ............................................................................................................................. 16

8.5 Heat treatment and forming .................................................................................................................... 17

8.5.1 Cold forming ................................................................................................................................................... 17

8.5.2 Hot forming .................................................................................................................................................... 17

8.5.3 Testing of formed parts .............................................................................................................................. 17

8.5.4 Visual examination and control of dimensions ................................................................................. 18

8.5.5 Marking ............................................................................................................................................................ 18

8.6 Welding ............................................................................................................................................................ 18

8.6.1 General ............................................................................................................................................................. 18

8.6.2 Longitudinal welds ...................................................................................................................................... 18

8.6.3 Welding procedure specification (WPS) .............................................................................................. 19

8.6.4 Qualification of WPS .................................................................................................................................... 19

8.6.5 Qualification of welders and welding operators ............................................................................... 19

8.6.6 Preparation of edges ................................................................................................................................... 19

8.6.7 Attachments and fastenings ...................................................................................................................... 19

8.6.8 Preheat ............................................................................................................................................................. 19

8.7 Post-weld heat treatment .......................................................................................................................... 20

8.8 Manufacturing tolerances.......................................................................................................................... 20

8.9 Repairs to pressure envelope and direct attachment welds ........................................................ 20

8.9.1 General requirements ................................................................................................................................. 20

8.9.2 Repair of surface imperfections in the parent metal ....................................................................... 20

8.9.3 Repair of weld imperfections ................................................................................................................... 20

9 Construction and workmanship of internal pipework ................................................................... 21

10 Manufacturing tests and examinations ................................................................................................ 21

10.1 General ............................................................................................................................................................. 21

10.2 Mechanical testing ........................................................................................................................................ 21

10.2.1 Production test plates ................................................................................................................................. 21

10.2.2 Longitudinal welds ....................................................................................................................................... 21

10.2.3 Circumferential welds ................................................................................................................................. 21

10.2.4 Mechanical tests ............................................................................................................................................ 21

10.2.5 Test requirements ........................................................................................................................................ 21

10.3 Non-destructive testing .............................................................................................................................. 22

10.3.1 General ............................................................................................................................................................. 22

10.3.2 Internal imperfections ................................................................................................................................ 23

10.3.3 Surface imperfections ................................................................................................................................. 23

10.4 Non-destructive testing for welds .......................................................................................................... 23

10.4.1 Radiographic testing ................................................................................................................................... 23

10.4.2 Marking and identification of radiographs ......................................................................................... 23

10.4.3 Ultrasonic testing .......................................................................................................................................... 23

10.4.4 Magnetic particle testing............................................................................................................................ 23

10.4.5 Penetrant testing .......................................................................................................................................... 24

10.5 Qualification of non-destructive testing personnel ......................................................................... 24

10.6 Visual examination of welds ..................................................................................................................... 24

10.7 Acceptance criteria ...................................................................................................................................... 24

10.8 Safety precautions at the hydraulic test ............................................................................................... 24

11 External corrosion protection and finishing ...................................................................................... 24

11.1 External protection ...................................................................................................................................... 24

11.2 Finishing operations .................................................................................................................................... 24

12 Marking ............................................................................................................................................................ 24

13 Records and documentation ..................................................................................................................... 25

13.1 Documentation obtained by the manufacturer ................................................................................. 25

13.2 Records prepared by the manufacturer ............................................................................................... 25

13.3 Retention and supply of documents ...................................................................................................... 25

Annex A (normative) Guidance on selection of material grades .............................................................. 26

Annex B (normative) Reference temperatures for design .......................................................................... 27

B.1 Introduction.................................................................................................................................................... 27

B.2 General ............................................................................................................................................................. 27

B.3 Developed pressure ..................................................................................................................................... 27

B.4 Filling ................................................................................................................................................................ 27

Annex C (informative) Alternative reference temperatures for design ................................................ 28

C.1 Introduction ................................................................................................................................................... 28

C.2 General ............................................................................................................................................................. 28

C.3 Developed pressure .................................................................................................................................... 28

C.4 Filling ................................................................................................................................................................ 28

Annex D (normative) Design ................................................................................................................................. 29

D.1 Design stresses .............................................................................................................................................. 29

D.1.1 D.1.1 .................................. The nominal design stress, f, shall be the lesser of Formula (D.1) or

Formula (D.2): ............................................................................................................................................... 29

D.1.2 D.1.2 ......................................................... The following units shall be used in the formulae in this

annex: ............................................................................................................................................................... 29

D.2 Design pressure ............................................................................................................................................ 29

D.3 Design formulae ............................................................................................................................................ 29

D.3.1 Cylindrical shell calculation ..................................................................................................................... 29

D.3.2 Dished ends .................................................................................................................................................... 30

D.3.2.1 Minimum thickness ..................................................................................................................................... 30

D.3.2.2 Torispherical end calculation .................................................................................................................. 30

D.3.2.3 Ellipsoidal end calculation ........................................................................................................................ 31

D.3.2.4 Hemispherical ends ..................................................................................................................................... 31

D.3.2.5 Formulae for calculating β ........................................................................................................................ 32

D.3.3 Conical shell calculations .......................................................................................................................... 33

D.3.3.1 General requirements ................................................................................................................................ 33

D.3.3.2 Thickness of conical shell .......................................................................................................................... 33

D.3.3.3 Junction between large end of a cone and a cylinder without a knuckle ................................. 34

D.3.3.4 Junction between the small end of a cone and a cylinder .............................................................. 35

D.4 Nozzle reinforcement ................................................................................................................................. 37

D.5 Nozzle reinforcement by pads or flanges ............................................................................................ 39

D.6 Nozzle reinforcement by branches ........................................................................................................ 40

Annex E (informative) Example of joints .......................................................................................................... 44

Annex F (normative) Allowable tolerances ..................................................................................................... 48

F.1 Pressure vessels ........................................................................................................................................... 48

F.1.1 External diameter ........................................................................................................................................ 48

F.1.2 Out of roundness .......................................................................................................................................... 48

F.1.3 Deviation of straightness........................................................................................................................... 48

F.1.4 Irregularities in profile .............................................................................................................................. 49

F.2 Dished end tolerance .................................................................................................................................. 49

F.2.1 Thickness of material ................................................................................................................................. 49

F.2.2 Profile................................................................................................................................................................ 49

F.3 Assembly tolerances .................................................................................................................................... 50

F.3.1 Middle line alignment ................................................................................................................................. 50

F.3.2 Surface alignment ......................................................................................................................................... 50

F.4 Attachments, nozzles and fittings ........................................................................................................... 51

F.5 Overall length ................................................................................................................................................. 51

Annex G (normative) Heat treatment ................................................................................................................. 52

G.1 Method of post-weld heat treatment ..................................................................................................... 52

G.2 Temperature control ................................................................................................................................... 52

G.3 Temperature limit ........................................................................................................................................ 52

G.4 Temperature measurement ..................................................................................................................... 52

Annex H (informative) Typical method for measurement of shell peaking ......................................... 53

H.1 Profile gauge ................................................................................................................................................... 53

H.2 Peaking survey .............................................................................................................................................. 53

Annex I (informative) Choice of non-destructive test methods for welds ............................................ 56

I.1 Internal imperfections ................................................................................................................................ 56

I.2 Surface imperfections ................................................................................................................................. 56

Annex J (normative) Hydraulic pressure test .................................................................................................. 57

J.1 Temporary fittings ....................................................................................................................................... 57

J.2 Pressure gauges ............................................................................................................................................ 57

J.3 Pressurizing agent ........................................................................................................................................ 57

J.4 Avoidance of shock ....................................................................................................................................... 57

J.5 Applied pressure ........................................................................................................................................... 57

Bibliography ................................................................................................................................................................. 58

This document (prEN 12493:2019) has been prepared by Technical Committee CEN/TC 286 “Liquefied

petroleum gas equipment and accessories”, the secretariat of which is held by NSAI.

This document supports the EU Directive 2008/68/EC and the associated Transport of Dangerous Goods

This document has been submitted for reference into the technical annexes of the ADR [15].

NOTE These regulations take precedence over any clause of this document. It is emphasized that

RID/ADR/ADN are being revised regularly at intervals of two years which could lead to temporary non-compliances

This document calls for the use of substances and procedures that could be injurious to health and/or the

environment if adequate precautions are not taken. It refers only to technical suitability: it does not

Protection of the environment is a key political issue in Europe and elsewhere. For CEN/TC 286 this is