Creating great opportunities for American motorists
Natural gas presents a great opportunity for American motorists. It’s clean, it’s low cost, and it’s plentiful. Thanks to fracking and horizontal drilling technologies, America is now a global leader in natural gas production. Plus, it’s distributed to 60 million homes in America.
So, why isn’t it used as a vehicle fuel today?Natural gas isn’t used for two reasons: refueling and storage. There aren’t fueling stations serving natural gas, often delivered under high pressure as in compressed natural gas (CNG). While the infrastructure in CNG fuel stations grows, the fuel container still consumes too much space. Natural gas vehicles (NGV’s), are fairly common across the world with as many as 20 million in use today. The packaging of the cylindrical storage vessel isn’t pretty, nor is it practical, as shown in the photograph to the right.
Convenience is king in America, and many other developed countries. Americans won’t buy a vehicle with so many compromises, on trunk space, range, or places to fill up. Until these issues are solved, CNG will not be a mainstream fuel for the USA.
REL’s Efforts to Solve the Problem
REL is tackling the issue of CNG tank packaging. Nature’s shape for high pressure storage is a sphere, or more practically, a cylinder. However, the enclosed volume around a cylinder is wasted seeing as it is unable to be utilized for gas storage. The non-cylindrical tank is called a “conformable” tank. The conformable tank stores high pressure compressed natural gas in the same place on a vehicle where gasoline is stored today, yet still has enough gas to meet the desired driving range of the vehicle.
Studies have shown an increase from 20-35% more CNG in the same package envelope. Our compressed natural gas tank will meet the needs for storage and driving distance!
A Foseco MDU-300 portable degassing unit has been added to the equipment used in the manufacturing of the tanks. This unit allows for the efficient removal of hydrogen gas in the melt. Along with the vacuum test REL now has complete confidence in the quality of the metal prior to the casting process.
Tank Testing Capabilities
Cycle testing is a key factor in determining the service life of a tank. REL designed and built a servo controlled cycle tester capable of cycling pressures between ambient and 8000 psi. NGV-2 specifications require the tank to be pressurized from less than 360 psi to 4500 psi 33,750 times for a 15-year life tank and 45,000 times for a 20-year life tank. The rate should be 10 cycles per minute.
The next application is for smaller vehicles, the airport shuttle buses, snow plows and other delivery vehicles. Next are the contractor pickups, a heavy duty pickup that gets 10-13 mpg and is driven regularly. To these contractors, the cargo bed space is premium space, and to use as much as 40% of it for fuel is not acceptable, and is a significant hurdle to mass market acceptance of CNG.
REL’s initial target application is the pick-up truck, to replace the cylinder in the bed, to allow contractors to use the cargo space for cargo.
REL is seeking financial and commercial partners to bring resources and investment for future product development, manufacturing scale-up, sales, marketing and distribution. If you are interested, please contact REL today.