{
  "url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.2/division-2.2.3",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.2/division-2.2.3.json",
  "legislation": "eur/2017/654",
  "legislation_title": "Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-654",
  "path": "annex/VII/division/2/division/2.2/division/2.2.3",
  "kind": "division",
  "number": "2.2.3",
  "heading": "Component specific factor u",
  "text": "The component specific factor u gas of diluted gas can either be calculated by means of equation (7-34) or be taken from Table 7.2; in Table 7.2 the density of the diluted exhaust gas has been assumed equal to air density.\nu = M gas M d,w × 1000 = M gas M da,w × 1 − 1 D + M r,w × 1 D × 1000\n(7-34)\nWhere:\nM gas molar mass of the gas component [g/mol]\nM d,w molar mass of diluted exhaust gas [g/mol]\nM da,w molar mass of dilution air [g/mol] (see equation (7-144) of point 3.9.3)\nM r,w molar mass of raw exhaust gas [g/mol] (see Appendix 2 point (5)\nD dilution factor [see equation (7-28) of point 2.2.2.2] [-]\nTable 7.2\nDiluted exhaust gas u values (for emission concentration expressed in ppm) and component densities\nDepending on fuel.\nAt λ = 2, dry air, 273 K, 101,3 kPa.\nu accurate within 0,2 % for mass composition of: C = 66 – 76 %; H = 22 – 25 %; N = 0 – 12 %.\nNMHC on the basis of CH2,93 (for total HC the u gas coefficient of CH4 shall be used).\nu accurate within 0,2 % for mass composition of: C3 = 70 – 90 %; C4 = 10 – 30 %.\nFuel\nρe\nGas\nNOx\nCO\nHC\nCO2\nO2\nCH4\nρgas [kg/m3]\n2,053\n1,250\n1,9636\n1,4277\n0,716\nugas\nDiesel (non-road gas-oil)\n1,2943\n0,001586\n0,000966\n0,000482\n0,001517\n0,001103\n0,000553\nEthanol for dedicated compression ignition engines (ED95)\n1,2768\n0,001609\n0,000980\n0,000780\n0,001539\n0,001119\n0,000561\nNatural gas / bio-methane\n1,2661\n0,001621\n0,000987\n0,000528\n0,001551\n0,001128\n0,000565\nPropane\n1,2805\n0,001603\n0,000976\n0,000512\n0,001533\n0,001115\n0,000559\nButane\n1,2832\n0,001600\n0,000974\n0,000505\n0,001530\n0,001113\n0,000558\nLPG\n1,2811\n0,001602\n0,000976\n0,000510\n0,001533\n0,001115\n0,000559\nPetrol (E10)\n1,2931\n0,001587\n0,000966\n0,000499\n0,001518\n0,001104\n0,000553\nEthanol (E85)\n1,2797\n0,001604\n0,000977\n0,000730\n0,001534\n0,001116\n0,000559",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Delegated Regulation (EU) 2018/989 of 18 May 2018 amending and correcting Delegated Regulation (EU) 2017/654 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery (Text with EEA relevance)."
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "Depending on fuel."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "At λ = 2, dry air, 273 K, 101,3 kPa."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "u accurate within 0,2 % for mass composition of: C = 66 – 76 %; H = 22 – 25 %; N = 0 – 12 %."
    },
    {
      "type": "footnote",
      "label": "f4",
      "text": "NMHC on the basis of CH2,93 (for total HC the u gas coefficient of CH4 shall be used)."
    },
    {
      "type": "footnote",
      "label": "f5",
      "text": "u accurate within 0,2 % for mass composition of: C3 = 70 – 90 %; C4 = 10 – 30 %."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/2/division/2.2/division/2.2.3",
    "retrieved_at": "2026-11-01T14:45:01.864924+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."
}