Oil and Gas Metering and Measurement Systems EN-FAB Inc offers accurate oil and gas metering and measurement systems designed for compliance, precision, and operational efficiency across facilities. EN-FAB, Inc. designs, engineers, and fabricates gas measurement, gas gathering and compression stations to industry standards and the exact design specifications supplied by the customers. The basic criteria for the design of gas measurement system consists of properties and conditions of flowing gas with rate, type and location of the station, and the code to which it is designed and built.