{
  "url": "https://openlegislation.uk/eu-regulation-2018-989/annex-XVII",
  "json_url": "https://openlegislation.uk/eu-regulation-2018-989/annex-XVII.json",
  "legislation": "eur/2018/989",
  "legislation_title": "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)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2018-989",
  "path": "annex/XVII",
  "kind": "annex",
  "number": "XVII",
  "heading": null,
  "text": "Annex VII to Delegated Regulation (EU) 2017/654 is corrected as follows:\n(1) point 2.4.1.1 is corrected as follows:\n(a) equation (7-59) is replaced by the following:\n‘\nW act = ∑ i = 1 N P i × Δ t i = 1 f × 1 3600 × 1 10 3 × 2 × π 60 × ∑ i = 1 N n i × T i\n(7-59)\n’;\n(2) point 3.9.5 is replaced by the following:\n‘3.9.5.\nCFV calibration\nSome CFV flow meters consist of a single venturi and some consist of multiple venturis, where different combinations of venturis are used to meter different flow rates. For CFV flow meters that consist of multiple venturis, either calibration of each venturi independently to determine a separate discharge coefficient, C d, for each venturi, or calibration of each combination of venturis as one venturi may be performed. In the case where a combination of venturis is calibrated, the sum of the active venturi throat areas is used as A t, the square root of the sum of the squares of the active venturi throat diameters as d t, and the ratio of the venturi throat to inlet diameters is the ratio of the square root of the sum of the active venturi throat diameters (d t) to the diameter of the common entrance to all of the venturis (D). To determine the C d for a single venturi or a single combination of venturis, the following steps shall be performed:\n(a) With the data collected at each calibration set point an individual C d for each point shall be calculated using equation (7-140);\n(b) The mean and standard deviation of all the C d values shall be calculated in accordance with equations (7-155) and (7-156);\n(c) If the standard deviation of all the C d values is less than or equal to 0,3 % of the mean C d, then the mean C d shall be used in equation (7-120), and the CFV shall be used only down to the lowest r measured during calibration;\nr = 1 – (Δp/pin )\n(7-148)\n(d) If the standard deviation of all the C d values exceeds 0,3 % of the mean C d, the C d values corresponding to the data point collected at the lowest r measured during calibration shall be omitted;\n(e) If the number of remaining data points is less than seven, corrective action shall be taken by checking calibration data or repeating the calibration process. If the calibration process is repeated, checking for leaks, applying tighter tolerances to measurements and allowing more time for flows to stabilize, is recommended;\n(f) If the number of remaining C d values is seven or greater, the mean and standard deviation of the remaining C d values shall be recalculated;\n(g) If the standard deviation of the remaining C d values is less than or equal to 0,3 % of the mean of the remaining C d, that mean C d shall be used in equation (7-120) and the CFV values only down to the lowest r associated with the remaining C d shall be used;\n(h) If the standard deviation of the remaining C d still exceeds 0,3 % of the mean of the remaining C d values, the steps set out in points (d) to (g) shall be repeated.’;\n(3) in Appendix 6, equation (7-180) is replaced by the following:\n‘\ncNH3 = (0,1 × cNH3,cold) + (0,9 × cNH3,hot)\n(7-180)\n’.",
  "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/eur/2018/989/annex/XVII",
    "retrieved_at": "2026-11-01T14:44:02.434888+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."
}