4 Wheel Drive/SUVs: Multiple CNG Cylinders in Automobiles.

Question
Dear Carl

http://en.wikipedia.org/wiki/Automobile
http://en.wikipedia.org/wiki/Compressed_natural_gas‎

Is it possible to install Multiple (More than one) CNG Cylinders in Automobiles  viz Medium and Heavy Vehicles viz Cars, Jeeps, Trucks, Lorries etc?.

I Feel the advantages would be double the Fuel storage capacity
in a automobile where in case one CNG Cylinder gets exhausted then automatically switching to the other CNG Cylinder as input Fuel source for the automobile.

Limitations could be the space required to fix the other extra CNG cylinder in the automobile ?.

Can this Limitation could be overcome in making space available for installation of another CNG Cylinder in the vehicle ?.

In terms of safety purposes do you recommend to have multiple CNG Cylinders in a automobile ?.

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

Answer
Prashant,

There are some concerns about multiple cylinders for safety reasons.
Here are some articles that may be of interest.

http://tribune.com.pk/story/556548/ihc-orders-removal-of-multiple-cng-cylinders-

http://www.gonaturalcng.com/cng-parts/cng-cylinders/

http://www.pakwheels.com/forums/cng-lpg/184249-cng-vehicle-accidents-issues-caus

Limitations to multiple cylinders would be the type of cylinders and the connections.  If multiple cylinders were to be used, local regulations should be checked, and top grade components should be used to guarantee the safety of the installation.

Carl