The Ministry of Road Transport and Highways on 4th May 2021 has published the Central Motor Vehicles (Eighth Amendment) Rules, 2021 in which it has notified the mass emission standards for CNG, Bio-CNG, LNG driven agriculture tractors, power tillers, construction equipment vehicles and combine harvesters.
In case of construction equipment vehicles, agriculture tractors, power tillers and combine harvesters, Type approval for diesel engine retrofitted for dedicated CNG/ Bio-CNG/LNG operation shall be given for specific make and model of the vehicle, and shall be approved as per the prevailing mass emission standards applicable for diesel engines of agriculture tractors, power tillers, construction equipment vehicles and combine harvesters, with the exception that the HC (Hydrocarbon) shall be replaced by NMHC (Non-Methane Hydrocarbon) on measurement basis.
Test for particulate matter and emission of visible pollutants (smoke) under these rules shall not applicable.
Further Separate type approval is required for mechanically controlled and electronically controlled diesel Fuel injected vehicles when retrofitted for CNG /Bio-CNG/LNG operation.
The type approval certificate of CNG or Bio-CNG or LNG for replacement engine shall be valid for three years from the date of the issue of type approval certificate and shall be renewable for three years at a time.
