Auto LPG V/s CNG 
 
1.Technical Specifications for Auto LPG & CNG in India
 
CNG LPG
   Constituent Value Tolerance

   Characteristics Requirement

Wobbe Number 1350 +/- 20
Water, lbs/million ft 3 0.5 Maximum
Hydrogen Sulphide, grains/100 ft 3 0.1 Maximum
Other Soluble Sulphide, grains/100 ft 3 0.1 Maximum
Carbon Dioxide, vol. % 3.0 Maximum
Oxygen, vol. % 1.0 Maximum
Vapour pressure (gauge) @ 40°C, kPa
   
   
   
Min. 520
Max. 1050
   Constituent Value Tolerance
Hydrocarbons and heavier, mol-%, Max. 2.0
Methane 80 Minimum
Ethane 10 Maximum
C 3 and Higher HC 5.0 Maximum
C 6 and Higher HC 1.0 Maximum
Total Unsaturated HC 1.0 Maximum
Dienes (as 1,3 Butadiene), mol-%, Max. 0.5
Total volatile sulphur (after stanching) ppm, Max. 150
Copper strip corrosion @ 40°C for 1 hour, Max. Class 1
Hydrogen sulphide To Pass the test
Evaporation residue, mg/kg, Max. 100
Free water content Nil
   Other Specifications (mole %)    Other Specifications
Hydrogen 0.1 Maximum
Carbon Monoxide 0.1 Maximum
C 3 and Higher HC 5.0 Maximum
C 6 and Higher HC 1.0 Maximum
Total Unsaturated HC 1.0 Maximum
Motor octane number (MON), Min. 88
Odour Unpleasant and Distinctive down
   Other Requirements    Other Requirements
Free from liquids over the entire range of temperatures and pressures encountered in the engine and fuel system.
  Free from solid particulate matter
In winter, the gauge vapour pressure requirement shall be minimum 700 kPa at 40°C. Winter period shall be from 1 st November to 15 th February.
The water content shall be determined at the Refinery/First Dispatching Location.
Product shall contain 20 ppm, min. ethyl mercaptan at the first dispatching location to ensure the detection of leakage by odour
   
 
2. Competitive Edge of Auto LPG over CNG
 
Comparison Parameters

CNG

Auto LPG

Bulk Movements  ONLY by Cylinders / Pipelines Rail – Road Tankers
Automotive Tank    
Storage Capacity 2.5 times less Convenient
Weight Very Heavy Convenient
Working Pressure 200-250 bars 6-8 bars only
Conversion Kit Cost Rs. 22 – 38 thousand Rs. 13 – 18 thousand
Feasibility Only Commercial Vehicles All Vehicles including 2 wheelers
Dispensing Station    
Vehicle Filling Time ~ 10 Minutes ~ 3 Minutes
Capital Expenditure Rs. 225 – 250 Lacs Rs. 50 – 70 Lacs
Power Requirement 150-200 hp 10-15 hp
Pay-back Period 3 - 4 Years 2 – 3 Years
 
3. Conversion Economics : Auto LPG & CNG v/s Petrol
 
 
Figures are estimated & presented for calculation ease.
Mileage, Price & Cost vary from vehicle to vehicle and place to place w.r.t. different brands of Conversion Kits.
 
 
VSM Solicits ALDS & Cylinder testing facility inquiry for following towns of India on first come first served basis : Baroda , Delhi , Ahemdabad , Rajkot , Aagra , Pune , Mumbai , Hydrabad.
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