Page 268 - The Central Motor Vehicles Rules, 1989

240 THE CENTRAL MOTOR VEHICLES RULES, 1989 RULE 115B
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[115B. [Mass emission standards for Compressed Natural Gas (CNG) or
Bio-Compressed Natural Gas (Bio-CNG) or Liquefied Natural Gas (LNG) Driven
Vehicles]
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115B
[(1)] [Mass emission standards for vehicles when operating on Compressed
Natural Gas (hereinafter in this rule referred to as "CNG") shall be the same as are
applicable for gasoline vehicles with the exception that HC shall be replaced by
Non-Methane Hydrocarbon (NMHC), where NMHC = 0.3 x HC:]
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[PROVIDED that bio-compressed natural gas (bio-CNG) shall be permitted for
motor vehicles as an alternate composition of the compressed natural gas (CNG):
PROVIDED FURTHER that the mass emission standards applicable to compressed
natural gas (CNG) vehicles under these rules shall be applicable to respective vehicles
when they use bio-compressed natural gas (bio-CNG):
PROVIDED ALSO that the bio-compressed natural gas (bio-CNG) composition
meets the fuel specification for bio-compressed natural gas (bio-CNG) as per IS 16087
and meets the requirement of Siloxanes max 0.1 ppm (calculated as Si).]
A. ORIGINAL EQUIPMENT/CONVERTED GASOLINE VEHICLES:
(I) For Gasoline Vehicles with Original Equipment (hereinafter in this rule referred to
as O.E.) Fitment:
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[(a) In case of CNG fitments by vehicle manufacturers on new petrol vehicles,
each model manufactured by vehicle manufacturers shall be type approved
as per the prevailing mass emission norms as applicable for the category of
new vehicles in respect of the place of its use;]
(b) Base model and variants of such vehicle shall conform to these rules as
applicable and type approval emission norms in petrol mode as specified
in these rules. In the case of CNG mode, it shall meet mass emission norms
as specified in rule 115, excluding crankcase and evaporative emission
norms;
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[(c) vehicle models and variants having option for bi-fuel operation and fitted
with limp-home Gasoline tank of capacity not exceeding two litres, three
litres and five litres respectively on two-wheeler, three-wheeler and
four-wheeler shall be exempted from mass emission tests including all tests
specified under sub-rule (2), Notes 6 and 7 mentioned below clause (c) of
sub-rule (14) and Notes 6, 7, 15 and 16 of sub-clause (i) of clause (b) of
sub-rule (15) of rule 115 in Gasoline mode;
(d) prevalent conformity of production procedure shall also be applicable.]
(II) For in-use Gasoline Vehicles:
(a) The in-use vehicles fitted with CNG kits shall meet the type approval
emission norms on CNG operation, as specified in these rules for gasoline
vehicles as applicable to the corresponding year of manufacture of such
vehicles, subject to a minimum norms as under:

1 Substituted vide GSR 853(E), dt. 19-11-2001, w.e.f. 19-5-2002.
2 Substituted for “Mass emission standards for compressed natural gas driven vehicles” vide GSR 1151(E),
dt. 29-11-2018, w.e.f. 29-11-2018.
3 Rule 115B renumbered as sub-rule (1) thereof vide GSR 643(E), dt. 27-6-2017, w.e.f. 27-6-2017.
4 Substituted by CMV (Amdt.) Rules, 2004 vide GSR 111(E), dt. 10-2-2004, w.e.f. 10-8-2004.
5 Inserted vide GSR 498(E), dt. 16-6-2015, w.e.f. 16-6-2015.
6 Substituted vide GSR 589(E), dt. 16-9-2005, w.e.f. 16-9-2006.
7 Substituted for existing clauses (c), (d) and (e) vide GSR 84(E), dt. 9-2-2009, w.e.f. 9-2-2009.