BS/EN 1442-2017 pdf download.LPG equipment and accessories — Transportable refillable welded steel cylinders for LPG — Design and construction.
NOTE Suitable specifications for 17E and 25E threads are Included In EN ISO 11363-1 (31.
5.7 Valve protection
The design of cylinders shall provide protection for the valves against damage in order to avoid the release of the contents, unless other means of valve protection has been provided.
When the valve protection Is Integral with the cylinder, this shall be demonstrated by drop testing in accordance with EN ISO 11117.
When the cylinder is not provided with integral valve protection, the manufacturer shall specify that cylinders containing LPG shall be conveyed in crates or cradles or shall be provided during transportation with some other effective valve protection. Otherwise, the cylinders shall be fitted with valves that have demonstrated, by impact tests in accordance with EN ISO 14245 or EN ISO 15995. that the valves can withstand damage without leakage of the contents.
5.8 Non-pressure containing attachments
5.8.1 Attachments shall be arranged so as not to impair the strength of, nor cause undue stresses in the cylinder and shall be so designed as to avoid trapping water and to permit external inspection of the attachment welds. They shall be clear of longitudinal and circumferential Joints.
5.8.2 Where a foot-ring is fitted, it shall be of adequate strength to provide stability and be attached so that It does not prevent inspection of any pressure containing welds. Any foot-ring shall be suitably drained and the space enclosed by the foot-ring suitably ventilated e.g. by means of openings.
5.9 Over-moulded cylinders
Cylinders complying with the requirements of Clause 5 may additionally be protected by over-moulding in accordance with the requirements of Annex B.
6 Construction and workmanship
6.1 General
Cylinder manufacturers shall have a documented quality system to ensure that the requirements of this standard are fulfilled and are correctly applied.
The manufacturer should endeavour to minimize wastage of materials by selecting appropriately sized materials related to the finished parts required for the manufacture. Unavoidable waste/scrap material should be recycled.
The manufacturer shall maintain records of such procedures, qualifications and approvals.
6.2.2 Welding procedure approval tests shall be on welds that are representative of those made In production.
6.2.3 Welders shall have passed the approval tests for the specific type of work and procedure to be
performed.
6.2.4 The manufacturer shall maintain the records of the above tests.
6.3 Plates and formed parts
6.3.1 The manufacturer shall ensure that the pressure parts of cylinders arc of uniform quality and free from visible defects that may ultimately affect the cylinder integrity.
6.3.2 Any hot lorming process should he designed to minimize energy consumption and ensure the environmentally friendly disposal of insulating material and other waste.
6.3.3 Material off-cuts should be processed for recycling.
6.4 Welded joints
6.4.1 The strength characteristics of the welds in the finished cylinder shall fulfil all requirements for the design and calculation of the cylinder. Where the valve boss is welded to the cylinder by a partial penetration weld, the strength of the joint shall be demonstrated by a prototype fatigue test in accordance with 7.11.
6.4.2 The welding of the longitudinal and circumferential loints shall be a fully mechanised or automatic process so as to provide consistent and reproducible welds.
6.4.3 There shall be no more than one longitudinal joint, which shall be butt-welded. Joggled butt- welds and permanent backing strips shall not be used for longitudinal welds.
6.4.4 There shall be no more than two circumferential joints, excluding the valve boss weld. These shall be butt-welded. Figure 4 shows an example of a typical joggled butt-weld I.e. with one member offset to form an integral backing strip. Other geometries than those shown in Figure 4 are permitted. provided satisfactory test results can be obtained in the finished cylinder.
6.4.5 Before the cylinders are closed, longitudinal welds shall be visually examined from both sides in accordance with EN ISO 17637.BS/EN 1442-2017 pdf download.
BS/EN 1442-2017 pdf download
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