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BS EN 12493:2020

BS EN 12493:2020

$198.66

LPG equipment and accessories. Welded steel pressure vessels for LPG road tankers. Design and manufacture

Published By Publication Date Number of Pages
BSI 2020 62
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This document specifies 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.

There is no upper size limit as this is determined by the gross vehicle weight limitation.

This document does not cover pressure vessels for pressure vessel containers.

NOTE 1

In the context of this document, the term “road tanker” is understood to mean “fixed tanks” and “demountable tanks” as defined in ADR.

NOTE 2

The equipment for the pressure vessels and the inspection and testing after assembly is covered by EN 12252 and EN 14334 , respectively.

NOTE 3

The design type of the road tanker is subject to approval by the competent authority, as required by ADR.

NOTE 4

This document is intended for LPG only; however, for other liquefied gases see  EN 14025 .

PDF Catalog

PDF Pages PDF Title
2 undefined
8 1 Scope
2 Normative references
10 3 Terms and definitions
11 4 Materials
4.1 Environmental
4.2 Suitability
4.3 Pressure retaining parts
4.4 Non-pressure retaining parts
4.5 Welding consumables
12 4.6 Non-metallic materials (gaskets)
4.7 Inspection documents for materials
5 Pressure vessel design
5.1 Design conditions
5.2 Minimum thickness
13 5.3 Surge plates
14 5.4 Doubler plates
5.5 Stresses due to motion
5.6 Self-supporting pressure vessels
5.7 Vacuum conditions
5.8 Pressure vessel mountings
15 5.9 Internal pipework
6 Openings
6.1 General
6.2 Reinforcement of openings
6.3 Threaded connections
6.4 Manhole
16 7 Non-pressure retaining parts
7.1 Attachment welds
7.2 Position of attachment welds
8 Workmanship and construction
8.1 General
8.2 Environment
8.3 Control of materials
17 8.4 Acceptable weld details
8.5 Heat treatment and forming
8.5.1 Cold forming
18 8.5.2 Hot forming
8.5.3 Testing of formed parts
8.5.4 Visual examination and control of dimensions
19 8.5.5 Marking
8.6 Welding
8.6.1 General
8.6.2 Longitudinal welds
8.6.3 Welding procedure specification (WPS)
8.6.4 Qualification of WPS
8.6.5 Qualification of welders and welding operators
8.6.6 Preparation of edges
20 8.6.7 Attachments and fastenings
8.6.8 Preheat
8.6.9 Post-weld heat treatment
8.6.10 Manufacturing tolerances
21 8.7 Repairs to pressure envelope and direct attachment welds
8.7.1 General requirements
8.7.2 Repair of surface imperfections in the parent metal
8.7.3 Repair of weld imperfections
9 Construction and workmanship of internal pipework
10 Manufacturing tests and examinations
10.1 General
22 10.2 Mechanical testing
10.2.1 Production test plates
10.2.2 Longitudinal welds
10.2.3 Circumferential welds
10.2.4 Mechanical tests
10.2.5 Test requirements
10.2.5.1 General
10.2.5.2 Bend test
10.2.5.3 Tensile test
10.2.5.4 Macroscopic examination
10.2.5.5 Impact tests
23 10.2.5.6 Re-tests
10.3 Non-destructive testing
10.3.1 General
10.3.2 Internal imperfections
10.3.3 Surface imperfections
10.4 Non-destructive testing for welds
10.4.1 Radiographic testing
24 10.4.2 Marking and identification of radiographs
10.4.3 Ultrasonic testing
10.4.4 Magnetic particle testing
10.4.5 Penetrant testing
10.5 Qualification of non-destructive testing personnel
10.6 Visual examination of welds
25 10.7 Acceptance criteria
10.8 Safety precautions at the hydraulic test
11 External corrosion protection and finishing
11.1 External protection
11.2 Finishing operations
12 Marking
13 Records and documentation
13.1 Documentation obtained by the manufacturer
13.2 Records prepared by the manufacturer
26 13.3 Retention and supply of documents
27 Annex A (normative)Guidance on selection of materials grades
28 Annex B (normative)Reference temperatures for design
B.1 Introduction
B.2 General
B.3 Developed pressure
B.4 Filling
29 Annex C (informative)Alternative reference temperatures for design
C.1 Introduction
C.2 General
C.3 Developed pressure
C.4 Filling
30 Annex D (normative)Design
D.1 Design stresses
D.2 Design pressure
D.3 Design formulae
D.3.1 Cylindrical shell calculation
31 D.3.2 Dished ends
D.3.2.1 Minimum thickness
D.3.2.2 Torispherical end calculation
32 D.3.2.3 Ellipsoidal end calculation
33 D.3.2.4 Hemispherical ends
D.3.2.5 Formulae for calculating β
34 D.3.3 Conical shell calculations
D.3.3.1 General requirements
35 D.3.3.2 Thickness of conical shell
D.3.3.3 Junction between large end of a cone and a cylinder without a knuckle
36 D.3.3.4 Junction between the small end of a cone and a cylinder
38 D.4 Nozzle reinforcement
40 D.5 Nozzle reinforcement by pads or flanges
41 D.6 Nozzle reinforcement by branches
45 Annex E (informative)Example of joints
49 Annex F (normative)Allowable tolerances
F.1 Pressure vessels
F.1.1 External diameter
F.1.2 Out of roundness
F.1.3 Deviation of straightness
50 F.1.4 Irregularities in profile
F.2 Dished end tolerance
F.2.1 Thickness of material
F.2.2 Profile
52 F.3 Assembly tolerances
F.3.1 Middle line alignment
53 F.3.2 Surface alignment
F.4 Attachments, nozzles and fittings
F.5 Overall length
54 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
55 Annex H (informative)Typical method for measurement of shell peaking
H.1 Profile gauge
H.2 Peaking survey
58 Annex I (informative)Choice of non-destructive test methods for welds
I.1 Internal imperfections
I.2 Surface imperfections
59 Annex J (normative)Hydraulic pressure test
J.1 Temporary fittings
J.2 Pressure gauges
J.3 Pressurizing agent
J.4 Avoidance of shock
J.5 Applied pressure

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BS EN 12493:2020
$198.66