Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:6600:p16
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 6600 (pt 16/28)
Character Range: 830492–836842

values'. In establishing of their limit values the terms of ISO 4259 Petroleum 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 technical reasons, the manufacturer of fuels shall 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 whether a fuel meets the requirements of the specifications, the terms of ISO 4259 shall be applied.
(b)  The range for cetane number is not in accordance with the requirements of a minimum range of 4R. However, in the case of a dispute between fuel supplier and fuel user, the terms of ISO 4259 may be used to resolve such disputes provided replicate measurements, of sufficient number to achieve the necessary precision, are made in preference to single determinations.
(c)  Even though oxidation stability is controlled, it is likely that shelf life will be limited. Advice shall be sought from the supplier as to storage conditions and life.
(d)  FAME content to meet the specification of EN 14214.

              6. Technical data on fuels for testing fuel cell vehicles

              6.1. Compressed hydrogen gas for fuel cell vehicles

Table A3/18
Hydrogen for fuel cell vehicles

Characteristics                                                                                                                                                                                                  Units            Limits  Test Method
Minimum                                                                                                                                                                                                          Maximum
Hydrogen fuel index                                                                                                                                                                                              % mole fraction  99.97                (a)
Total non-hydrogen gases                                                                                                                                                                                         μmol/mol                 300
Lists of non-hydrogen gases and the specification of each contaminant (f)
Water (H2O)                                                                                                                                                                                                      μmol/mol                 5            (e)
Total hydrocarbons (b) except methane (C1 equivalent)                                                                                                                                                            μmol/mol                 2            (e)
Methane (CH4)                                                                                                                                                                                                    μmol/mol                 100          (e)
Oxygen (O2)                                                                                                                                                                                                      μmol/mol                 5            (e)
Helium (He)                                                                                                                                                                                                      μmol/mol                 300          (e)
Total Nitrogen (N2) and Argon (Ar) (b)                                                                                                                                                                           μmol/mol                 300          (e)
Carbon dioxide (CO2)                                                                                                                                                                                             μmol/mol                 2            (e)
Carbon monoxide (CO) (c)                                                                                                                                                                                         μmol/mol                 0.2          (e)
Total sulfur compounds (d) (H2S basis)                                                                                                                                                                           μmol/mol                 0.004        (e)
Formaldehyde (HCHO)                                                                                                                                                                                              μmol/mol                 0.2          (e)
Formic acid (HCOOH)                                                                                                                                                                                              μmol/mol                 0.2          (e)
Ammonia (NH3)                                                                                                                                                                                                    μmol/mol                 0.1          (e)
Total halogenated compounds (e)                                                                                                                                                                                  μmol/mol                 0.05         (e)
(Halogenate ion basis)
(a)  The hydrogen fuel index is determined by subtracting the "total non-hydrogen gases" in this table, expressed in mole per cent, from 100 mole per cent.
(b)  Total hydrocarbons except methane include oxygenated organic species.
(c)  The sum of measured CO, HCHO and HCOOH shall not exceed 0.2 µmol/mol
(d)  As a minimum, total sulphur compounds include H2S, COS, CS2 and mercaptans, which are typically found in natural gas.
(e)  Test method shall be documented. Test methods