All About CNG Tanks
There are four different kinds of CNG Tanks in widespread use today. The right tank for you will depend on your specific application and needs.
Type 1: All Metal
All metal tanks (Steel or Aluminum) are proven and inexpensive but they are also the heaviest of the options. A tank can easily weigh 350 lbs or more which reduces mileage and puts additional strain on the suspension. As with any steel product it is subject to corrosion.
Type 2: Metal With Wire or Hoop Wrapped
Type 2 cylinders have a thinner metal liner and a composite and wire or metal hoop “wrap” that provides reinforcement for the cylinders. The Type 2 is lighter than the Type 1 but can still weigh in excess of 150 – 200 lbs. It is also subject to corrosion.
Type 3: Fully Wrapped Composite
Type 3 has a metal liner that is completely wrapped in a composite / fiber resin. They are much lighter than a Type 1 cylinders but they are more expensive. (A video that shows the manufacturing process for a Type 3 cylinder can be seen here.
Type 4: Full Composite
Type 4 cylinders have a polymer liner wrapped in fiber. These are the lightest types of cylinders and they do not corrode, but they are also the most expensive. However, prices on the composite tanks have been declining swiftly making them more cost effective than ever before.