BS EN 1442:2017 download free.LPG equipment and accessories Transportable refillable welded steel cylinders for LPG Design and construction.
BS EN 1442 calls for the use of substances and procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage.
It has been assumed in the drafting of BS EN 1442 that the execution of its provisions is entrusted to appropriately qualified and experienced people.
All pressures are gauge pressures unless otherwise stated.
NOTE BS EN 1442 requires measurement of material properties, dimensions and pressures. All such measurements are subject to a degree of uncertainty due to tolerances in measuring equipment. etc. It may be beneficial to refer to the leaflet measurement uncertainty leaflet (SP INFO 2000 27 uncertainty pdt)” 171.
1 Scope
This European Standard specifies the minimum requirements for the design, construction and testing during manufacture of transportable refillable welded steel Liquefied Petroleum Gas (LPG) cylinders, of water capacity from 0,5 1 up to and including 150 1.
BS EN 1442 applies only to cylinders having a circular cross-section.
Cylinders designed and constructed to the requirements of BS EN 1442 may be overmoulded; additional requirements for these cylinders are set out in Annex B.
2 Normative references
The following documents, in whole or in part, are normatively referenced in BS EN 1442 and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 10120, Steel sheet and strip for welded gas cylinders
EN 10204, Metallic products – Types of inspection documents
EN 14784-1, Non-destructive testing – Industrial computed radiography with storage phosphor imaging plates – Part 1: Classification of systems
EN 14784-2, Non-destructive testing – Industrial computed radiography with storage phosphor imaging plates- Part 2: General principles for testing of metallic materials using X-rays and gamma rays
EN 14894, LPG equipment and accessories – Cylinder and drum marking
EN ISO 14245, Gas cylinders – Specifications and testing of LPG cylinder valves – Self-closing (ISO 14245)
EN ISO 15995, Gas cylinders – Specifications and testing of LPG cylinder valves- Manually operated (ISO 15995)
6.5 Tolerances
6.5.1 Out-of-roundness
The out-of-roundness of the cylindrical shell shall be limited so that the difference between the maximum and the minimum outside diameter in the same cross-section is not more than 1 % of the mean of these diameters for two piece cylinders and 1,5 % for three piece cylinders. The measurement shall not be taken over any circumferential welds.
6.5.2 Straightness
The maximum deviation of the cylindrical part of the shell from a straight line shall not exceed 0,3 % of the cylindrical length.
6.5.3 Verticality
When the cylinder is standing on its base, the cylindrical shell and the axis of the top opening shall be vertical to within 1,50 (approximately 26 mm per metre of height).
6.6 Closure of openings
To protect the thread from damage and to prevent entry of moisture into the cylinder, openings in finished cylinders shall be either:
a) fitted with a plug of suitable non-absorbent material; or
b) fItted with the appropriate valve or fitting.
All valve or fittings threads shall be compatible with the threads in the opening.
6.7 Heat treatment
6.7.1 Cylinders shall be heat-treated (normalized or stress relieved), unless the requirements of 6.7.4 have been satisfied.
6.7.2 The cylinder manufacturer shall maintain records of heat treatment carried out.
6.7.3 Localized heat treatment shall not be permitted.
7.3.4 Valve boss welds
The welding of the valve boss shall be checked by radiographic or macro examination In accordance with 7.8 or 7.9.
7.4 TensIle test
7.4.1 Parent metal
7.4.1.1 Procedure
The preparation of test specimens and procedure [or carrying out the tensile test shall be in accordance with EN ISO 6892-1 and EN ISO 4136.
The two faces of the test specimen representing the inside and outside walls of the cylinder respectively shall not be machined.
7.4.1.2 Requirements
The values obtained for yield strength (ReH or Ro,2). tensile strength (Rm) and elongation (A) shall be not less than those guaranteed by the cylinder manufacturer in the finished cylinder (R0, Rg and A).
7.4.2 Welds
7.4.2.1 Procedure
The tensile test perpendicular to the weld shall be carried out in accordance with EN ISO 4136 on a test specimen having a reduced cross section of 25 mm in width for a length extending up to 15 mm beyond the edges of the weld (see Figure 7). Beyond this central part the width of the test specimen shall increase progressively.
7.4.2.2 Requirements
The tensile strength value obtained, R,,1, shall not be less than that guaranteed by the cylinder manufacturer R,, irrespective of where the fracture occurs in the cross section of the central part of the test specimen.
7.10 Visual examination of the surface of the weld
7.10.1 Procedure
The completed weld shall be examined in accordance with EN ISO 17637. The welded surface to be examined shall be well illuminated, and shall be free from grease, dust, scale residue and protective coating of any kind.
7.10.2 Requirements
The welds shall comply with 6.4.6 and 6.4.7.
Following the tests; all parts and cylinders that are not being retained (for record purposes) should be processed for recycling.
7.11 Fatigue test
7.11.1 Procedure
7.11.1.1 The cylinders shall be filled with a non-corrosive liquid. e.g. water with a corrosion inhibitor, and subjected to successive applications of hydraulic pressure.
7.11.1.2 The test shall be carried out at an upper cyclic pressure either:
a) equal to two thirds of the test pressure, in which case the cylinder shall be subjected to 80 000 cycles; or
b) equal to the test pressure, In which case the cylinder shall be subjected to 12 000 cycles.
7.11.1.3 The value of the lower cyclic pressure shall not exceed 10 % of the upper cyclic pressure.
7.11.1.4 The frequency of pressure cycling shall not exceed 0,25 Hz (15 cycles/mm). The temperature measured on the outside surface of the cylinder shall not exceed 50 °C during the test.
7.11.2 Requirements
There shall he no leakage from the cylinder.
10 Marking
10.1 Each cylinder shall be marked clearly and legibly with certification, manufacturing and operational information in accordance with EN 14894. together with those standard specific marks required by Annex A.
10.2 Where the marking is directly on the surface of the steel cylinder. It shall be demonstrated by the fatigue and burst tests that failure does not initiate in the markings and the markings remain legible.
NOTE The marking of cylinders is regulated by RID 141/ADR [51 which takes precedence over any clause in this European Standard. The European Directive on Transportable Pressure Equipment 2010/35/EU [61 includes additional marking requirements (n-marking).
Any packaging and protection used during storage/transport of the finished products should be selected to have the minimum environmental impact, i.e. use of recyclable or biodegradable materials. minimum use of energy.
11 Documentation
All testing and approvals shall be documented.
12 Certificate
Each production batch of cylinders shall be covered by a certificate stating that the cylinders meet the requirements of this European Standard in all respects.