Rajasthan State Gas Limited

(A Joint Venture Company of RSPCL & Gail Gas Limited)

Do's and Don’ts!

  • Always refer to the supplier’s kit manual for the trouble-shooting guide and do not do it yourself
  • In case of vehicles undergoing repairs involving welding, or heat application to any part (within 1.5 metre) of the cylinder, the cylinder should be emptied first
  • Do not install a LPG, Propane or any other cylinder in place of a CNG cylinder. It is illegal and unsafe
  • For emergency handling of any CNG leak, users must be aware of the location and operation of cylinder valve, master shut-off valve and burst disc in the CNG system. Study the system and ask your mechanic to identify these parts for you
  • Workshop doing the kit fitment should be able to demonstrate these operations to your satisfaction. It is advisable to operate the vehicle occasionally on petrol to ensure that the petrol system remains in good working conditions
  • The CNG kit installed in the vehicle shouldbe insured along with vehicle accessories. The motorist should notify theinsurance company to provide insurance on the CNG system, for which additionalpremium may be charged by the insurance company.Motorists should take theinsurance cover for the additional CNG kit system.
  • As per present government regulation thepollution check and a pollution certificate is mandatory even after convertingthe vehicle on CNG.
  • A pressurized gas cylinder is probably thestrongest component on the vehicle. Vehicles that were totally destroyed incollisions show the only discernible component being the intact gas cylinder. Itis unlikely that cylinders will rupture due to collision impact.
  • Regarding the danger of fire from leakingcylinders, all we have is the experience to date that indicates that such anevent is unlikely to occur. The risk of fire from leaking cylinders must be lowsince there are well over 03 million CNG vehicle installation worldwide thathave not experienced such problems.
  • It is worth pointing out that natural gas islighter than air and in the unlikely event of a leak from piping or containerthe gas will dissipate upwards quite quickly.In the case of petrol and LPG the vapour given off is heavier than air and will tend to pool near the ground.

All kinds of vehicles can run on CNG by installing CNG kit. Kit is anassembly of many components required to run existing vehicle on CNG. There arefew basic components which are common in all type of kits, irrespective of the vehicles; such as CNG storage cylinder,high pressure tube, pressure regulator,pressure gauge, change over switch,high pressure tube fittings, refuelling receptacle and air fuel mixer.

Major components of CNG kit for carburettor fitted petrol vehicle are illustrated below:

  1. Pressure Regulator
  2. Petrol Solenoid Valve with manual override switch. (Stops petrol flow when operating on CNG)
  3. On-Off valve and refuelling connector. (Opens or stops gas flow to the regulator and includes a refuelling device)
  4. Control Module/Change-over Switch (Electronic control component with fuel selection switch)
  5. CNG level Indicator(LED Indicator)
  6. Gas Air Mixer
  7. CNG cylinder with valve, vapour bag & bracket
  8. Petrol hose
  9. Low-pressure gas hose& Ignition advance processor
  10. High pressure gas tube&Wire harness &NRV in petrol return line Pressure gauge