{
  "url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.5/division-2.5.1",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.5/division-2.5.1.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/2.5/division/2.5.1",
  "kind": "division",
  "number": "2.5.1",
  "heading": "Positive displacement pump (PDP)",
  "text": "All the parameters related to the pump shall be simultaneously measured along with the parameters related to a calibration venturi which is connected in series with the pump. The calculated flow rate (in m3/s at pump inlet, absolute pressure and temperature) shall be plotted versus a correlation function which is the value of a specific combination of pump parameters. The linear equation which relates the pump flow and the correlation function shall be determined. If a CVS has a multiple speed drive, the calibration shall be performed for each range used.\nTemperature stability shall be maintained during calibration.\nLeaks in all the connections and ducting between the calibration venturi and the CVS pump shall be maintained lower than 0,3 % of the lowest flow point (highest restriction and lowest PDP speed point).\nThe airflow rate (qV CVS) at each restriction setting (minimum 6 settings) shall be calculated in standard m3/s from the flowmeter data using the manufacturer's prescribed method. The airflow rate shall then be converted to pump flow (V 0) in m3/rev at absolute pump inlet temperature and pressure by means of equation (7-69):\nV 0 = q V CVS n × T 273,15 × 101,325 p p\n(7-69)\nwhere:\nqV CVS airflow rate at standard conditions (101,325 kPa, 273,15 K) [m3/s]\nT temperature at pump inlet [K]\np p absolute pressure at pump inlet [kPa]\nn pump speed [rev/s]\nTo account for the interaction of pressure variations at the pump and the pump slip rate, the correlation function (X 0) [s/rev] between pump speed, pressure differential from pump inlet to pump outlet and absolute pump outlet pressure shall be calculated by means of equation (7-70):\nX 0 = 1 n × Δ p p p p\n(7-70)\nWhere:\nΔp p pressure differential from pump inlet to pump outlet [kPa]\np p absolute outlet pressure at pump outlet [kPa]\nn pump speed [rev/s]\nA linear least-square fit shall be performed to generate the calibration by means of equation (7-71):\nV 0 = D 0 –m · X 0\n(7-71)\nwith D 0 [m3/rev] and m [m3/s], intercept and slope respectively, describing the regression line.\nFor a CVS system with multiple speeds, the calibration curves generated for the different pump flow ranges shall be approximately parallel, and the intercept values (D 0) shall increase as the pump flow range decreases.\nThe calculated values from the equation shall be within ± 0,5 % of the measured value of V 0. Values of m will vary from one pump to another. Particulate influx over time will cause the pump slip to decrease, as reflected by lower values for m. Therefore, calibration shall be performed at pump start-up, after major maintenance, and if the total system verification indicates a change of the slip rate.",
  "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/2017/654/annex/VII/division/2/division/2.5/division/2.5.1",
    "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."
}