Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:11:p8
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 11 (pt 8/45)
Character Range: 431573–442734

7941
C3-content                                                                                                                                                                                                                                                                                                                     per cent vol  30 ± 2          85 ± 2
C4-content                                                                                                                                                                                                                                                                                                                     per cent vol  balance         balance
< C3 , >C4                                                                                                                                                                                                                                                                                                                     per cent vol  max. 2          max. 2
Olefins                                                                                                                                                                                                                                                                                                                        per cent vol  max. 12         max. 15
Evaporation residue                                                                                                                                                                                                                                                                                                            mg/kg         max. 50         max. 50         ISO 13757
Water at 0C                                                                                                                                                                                                                                                                                                                                 free            free            visual inspection
Total sulphur content                                                                                                                                                                                                                                                                                                          mg/kg         max. 50         max. 50         EN 24260
Hydrogen sulphide                                                                                                                                                                                                                                                                                                                            none            none            ISO 8819
Copper strip corrosion                                                                                                                                                                                                                                                                                                         rating        Class 1         class 1         ISO 6251 1/
Odour                                                                                                                                                                                                                                                                                                                                        characteristic  characteristic
Motor octane number                                                                                                                                                                                                                                                                                                                          min. 89         min. 89         EN 589 Annex B

   1/ This method may not accurately determine the presence of corrosive materials if the sample contains corrosion inhibitors or other chemicals which diminish the corrosivity of the sample to the copper strip.  Therefore, the addition of such compounds for the sole purpose of biasing the test method is prohibited.

        1.1.2. Technical  data  of  the  LPG  reference  fuels  used  for testing  vehicles  to  the  emission  limits  given  in  row  B  of the  table  in  PARAGRAPH  5.3.1.4.  of  Annex  I - Type  I  test

Parameter                                                                                                                                                                                                                                                                                                                     Unit          Fuel A          Fuel B          Test method
Composition:                                                                                                                                                                                                                                                                                                                                                                ISO 7941
C3-content                                                                                                                                                                                                                                                                                                                    per cent vol  30 ± 2          85 ± 2
C4-content                                                                                                                                                                                                                                                                                                                    per cent vol  balance         balance
< C3 , >C4                                                                                                                                                                                                                                                                                                                    per cent vol  max. 2          max. 2
Olefins                                                                                                                                                                                                                                                                                                                       per cent vol  max. 12         max. 15
Evaporation residue                                                                                                                                                                                                                                                                                                           mg/kg         max. 50         max. 50         ISO 13757
Water at 0 C                                                                                                                                                                                                                                                                                                                               free            free            Visual inspection
Total sulphur content                                                                                                                                                                                                                                                                                                         mg/kg         max. 10         max. 10         EN 24260
Hydrogen sulphide                                                                                                                                                                                                                                                                                                                           none            none            ISO 8819
Copper strip corrosion                                                                                                                                                                                                                                                                                                        Rating        class 1         class 1         ISO 6251 1/
Odour                                                                                                                                                                                                                                                                                                                                       characteristic  characteristic
Motor octane number                                                                                                                                                                                                                                                                                                                         min. 89         min. 89         EN 589 Annex B

  1/ This method may not accurately determine the presence of corrosive materials if the sample contains corrosion inhibitors or other chemicals which diminish the corrosivity of the sample to the copper strip.  Therefore, the addition of such compounds for the sole purpose of biasing the test method is prohibited.

        1.2. TECHNICAL DATA OF THE NG REFERENCE FUELS

Characteristics                                               Units          Basis  Limits  Test Method
minimum                                                       maximum
Reference fuel G20
Composition:
Methane                                                       per cent mole  100    99      100          ISO 6974
Balance 1/                                                    per cent mole  -      -       1            ISO 6974
N2                                                            per cent mole                              ISO 6974
Sulphur content                                               mg/m3  2/      -      -       10           ISO 6326-5
Wobbe Index (net)                                             MJ/m3  3/      48.2   47.2    49.2
Reference fuel G25
Composition:
Methane                                                       per cent mole  86     84      88           ISO 6974
Balance 1/                                                    per cent mole  -      -       1            ISO 6974
N2                                                            per cent mole  14     12      16           ISO 6974
Sulphur content                                               mg/m3  2/      -      -       10           ISO 6326-5
Wobbe Index (net)                                             MJ/m3  3/      39.4   38.2    40.6

  1/ Inerts (different from N2) + C2 +C2+

  2/ Value to