Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:4:p39
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 4 (pt 39/42)
Character Range: 112659–115468

diesel and LPG fuelled engines, all these tests may be conducted with commercial fuel. However, at the manufacturer's request, the reference fuels described in Annex IV may be used. This implies tests, as described in Section 4 of this Annex, with at least two of the reference fuels for each gas engine.

              9.1.1.2.4.                For NG fuelled engines, all these tests may be conducted with commercial fuel in the following way:

                —    for H marked engines with a commercial fuel within the H-range (0,89 ≤ Sλ ≤ 1,00),

                —    for L marked engines with a commercial fuel within the L-range (1,00 ≤ Sλ ≤ 1,19),

                —    for HL marked engines with a commercial fuel within the extreme range of the λ-shift factor (0,89 ≤ Sλ ≤ 1,19).

              However, at the manufacturer's request, the reference fuels described in Annex IV may be used. This implies tests, as described in Section 4 of this Annex.

9.1.1.2.5.                In the case of dispute caused by the non-compliance of gas fuelled engines when using a commercial fuel, the tests shall be performed with a reference fuel on which the parent engine has been tested, or with the possible additional fuel 3 as referred to in paragraphs 4.1.3.1 and 4.2.1.1 on which the parent engine may have been tested. Then, the result has to be converted by a calculation applying the relevant factor(s) 'r', 'ra' or 'rb' as described in paragraphs 4.1.4, 4.1.5.1 and 4.2.1.2. If r, ra or rb are less than 1 no correction shall take place. The measured results and the calculated results must demonstrate that the engine meets the limit values with all relevant fuels (fuels 1, 2 and, if applicable, fuel 3 in the case of natural gas engines and fuels A and B in the case of LPG engines).

9.1.1.2.6.                Tests for conformity of production of a gas fuelled engine laid out for operation on one specific fuel composition shall be performed on the fuel for which the engine has been calibrated.
        Figure 2

        Schematic of production conformity testing

Appendix 1

         PROCEDURE FOR PRODUCTION CONFORMITY TESTING WHEN STANDARD DEVIATION IS SATISFACTORY

           1. This Appendix describes the procedure to be used to verify production conformity for the emissions of pollutants when the manufacturer's production standard deviation is satisfactory.

         2.      With a minimum sample size of three engines the sampling procedure is set so that the probability of a lot passing a     test with 40 % of the engines defective is 0,95 (producer's risk = 5 %) while the probability of a lot being accepted     with 65 % of the engines defective is 0,10 (consumer's risk = 10 %).

         3.      The following procedure is used for each of the pollutants given in Section