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2.1. Wall thickness

Directive 2014/29/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of simple pressure vessels (recast) Text with EEA relevance · European Union

If the product of PS × V is not more than 3000 bar.L, the manufacturer shall select one of the methods described in points 2.1.1 and 2.1.2 for determining vessel wall thickness; if the product of PS × V is more than 3000 bar.L, or if the maximum working temperature exceeds 100 °C, such thickness shall be determined by the method described in point 2.1.1. The actual wall thickness of the cylindrical section and ends shall, however, be not less than 2 mm in the case of steel vessels and not less than 3 mm in the case of aluminium or aluminium alloy vessels. The minimum thickness of pressurised parts shall be calculated having regard to the intensity of the stresses and to the following provisions: the calculation pressure to be taken into account shall not be less than the maximum working pressure PS selected; the permissible general membrane stress shall not exceed the lower of the values 0,6 R_(eT) or 0,3 R_(m). The manufacturer shall use the R_(eT) and R_(m) minimum values guaranteed by the producer of the material in order to determine the permissible stress. However, where the cylindrical portion of the vessel has one or more longitudinal welds made using a non-automatic welding process, the thickness calculated as referred to in the first paragraph shall be multiplied by the coefficient 1,15. Wall thickness shall be so determined as to enable the vessels to resist at ambient temperature a pressure equal to at least five times the maximum working pressure, with a permanent circumferential deformation factor of no more than 1 %.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-03 · Text as adopted (Official Journal); later amendments are not incorporated in this text.