Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:9:p38
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 9 (pt 38/71)
Character Range: 317508–320461

it is required to calculate the thermal efficiency of an engine or vehicle, the calorific value of the fuel can be calculated from:
      Specific energy (calorific value)(net) in MJ/kg = (46,423 - 8,792d2 + 3,170d)(1 - (x + y + s)) + 9,420s - 2,499x where,
      d = the density at 15 °C
      x = the proportion by mass of water (% divided by 100) y = the proportion by mass of ash (% divided by 100)
      s = the proportion by mass of sulphur (% divided by 100).
      (2)   The values quoted in the specification are 'true values'. In establishment of their limit values the terms of ISO 4259, Petroleums products — Determination and application of precision data in relation to methods of test, have been applied and in fixing a minimum value, a minimum difference of 2R above zero has         been taken into account; in fixing a maximum and minimum value, the minimum difference is 4R (R = reproducibility). Notwithstanding this measure, which        is necessary for statistical reasons, the manufacturer of  a fuel should nevertheless aim  at a zero  value where the stipulated  maximum value is 2R and at the   mean value in the case of quotations of maximum and minimum limits. Should it be necessary to clarify the question as to whether a fuel meets the       requirements of the specification, the terms of ISO 4259 should be applied.
      (3)   The range for cetane number is not in accordance with the requirement of a minimum range of 4R. However, in the case of dispute between fuel supplier and
      fuel user, the terms in ISO 4259 can be used to resolve such disputes provided replicate measurements, of sufficient number to achieve the necessary precision, are made in preference to single determinations.
      (4)   The month of publication will be completed in due course.
      (5)   The actual sulphur content of the fuel used for the test shall be reported. In addition, the sulphur content of the reference fuel used to approve a vehicle or       engine against the limit values set out in row B of the Table in Section 6.2.1. of Annex I to this Directive shall have a maximum sulphur content of 50 ppm.       The Commission will as soon as possible bring forward a modification to this Annex reflecting the market average for fuel sulphur content in respect of the        fuel defined in Annex IV to Directive 98/70/EC.
      (6)   Even though oxidation stability is controlled, it is likely that shelf life will be limited. Advice should be sought from the supplier as to storage conditions and life.

    1.2.         Ethanol for diesel engines (1)

                                                                            Limits (2)
        Parameter                               Unit                                      Test method (3)
 Minimum                                        Maximum
Alcohol, mass                                   % m/m                92,4               —                  ASTM D