{
  "url": "https://openlegislation.uk/eu-directive-2014-68/annex-I/division-1/division-n6/division-2.2/division-2.2.3/division-b",
  "json_url": "https://openlegislation.uk/eu-directive-2014-68/annex-I/division-1/division-n6/division-2.2/division-2.2.3/division-b.json",
  "legislation": "eudr/2014/68",
  "legislation_title": "Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment (recast) (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-directive-2014-68",
  "path": "annex/I/division/1/division/n6/division/2.2/division/2.2.3/division/b",
  "kind": "division",
  "number": "(b)",
  "heading": "Resistance",
  "text": "Appropriate design calculations shall be used to establish the resistance of the pressure equipment concerned.\nIn particular:\nthe calculation pressures shall not be less than the maximum allowable pressures and take into account static head and dynamic fluid pressures and the decomposition of unstable fluids. Where a vessel is separated into individual pressure-containing chambers, the partition wall shall be designed on the basis of the highest possible chamber pressure relative to the lowest pressure possible in the adjoining chamber,\nthe calculation temperatures shall allow for appropriate safety margins,\nthe design shall take appropriate account of all possible combinations of temperature and pressure which might arise under reasonably foreseeable operating conditions for the equipment,\nthe maximum stresses and peak stress concentrations shall be kept within safe limits,\nthe calculation for pressure containment shall utilise the values appropriate to the properties of the material, based on documented data, having regard to the provisions set out in point 4 together with appropriate safety factors. Material characteristics to be considered, where applicable, include:\nyield strength, 0,2 % or 1,0 % proof strength as appropriate at calculation temperature,\ntensile strength,\ntime-dependent strength, i.e. creep strength,\nfatigue data,\nYoung’s modulus (modulus of elasticity),\nappropriate amount of plastic strain,\nbending rupture energy,\nfracture toughness.\nappropriate joint factors shall be applied to the material properties depending, for example, on the type of non-destructive testing, the materials joined and the operating conditions envisaged,\nthe design shall take appropriate account of all reasonably foreseeable degradation mechanisms (e.g. corrosion, creep, fatigue) commensurate with the intended use of the equipment. Attention shall be drawn, in the instructions referred to in point 3.4, to particular features of the design which are relevant to the life of the equipment, for example:\nfor creep: design hours of operation at specified temperatures,\nfor fatigue: design number of cycles at specified stress levels,\nfor corrosion: design corrosion allowance.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudr/2014/68/annex/I/division/1/division/n6/division/2.2/division/2.2.3/division/b",
    "retrieved_at": "2026-11-01T15:21:42.605150+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}