The Maryland MTA LNG Refueling System

The Maryland Mass Transit Administration (MTA) is demonstrating the use of liquefied natural gas (LNG) as a cost-effective and low emission transit bus fuel. The potential advantages of LNG as a transit bus fuel relative to using compressed natural gas (CNG) include lower fuel system weight, smaller volume required for the fuel system components, shorter time required for refueling and lower refueling facility cost, more uniform and higher fuel quality, and less demand on utility gas line flow limits. The LNG storage and dispensing system must be engineered in conjunction with the LNG fuel system on the bus to achieve fast, reliable and safe refueling. This paper describes the LNG storage and dispensing system designed and built to support the Maryland MTA demonstration of LNG transit buses.