Page 631 - The Central Motor Vehicles Rules, 1989

ANNEXURE IV-F THE CENTRAL MOTOR VEHICLES RULES, 1989 603

Ash content % m/m — 0.01 EN-ISO 6245
Water content % m/m — 0.05 EN-ISO 12937

Neutralization (strong acid) Mg — 0.02 ASTM D 974-95
number KOH/g
(4)
Oxidation stability mg/ml — 0.025 EN-ISO 12205
New and better method for % m/m — — EN 12916
polycyclic aromatics under
development
(1)
The values quoted in the specifications are "true values". In establishment 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 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 questions as to whether a fuel meets the requirements of the
specifications, the terms of ISO 4259 should be applied.
(2)
The range of 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 achive the necessary precision, are made in preference to single
determinations.
(3)
The actual sulphur content of the fuel used for the Type I test shall be reported.
(4)
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.