Modular Production Systems and Skid Mounted Process Units by EN-FAB Inc EN-FAB Inc delivers modular production systems and skid mounted process units with complete engineering, fabrication, and testing for flexible, efficient, and fast deployment in oil and gas operations. Modular systems can be comprised of many unit operations contained on a single skid or multiple skids that are connected on site to form a large process system. They are delivered as complete turnkey structures, that include all process equipment - pressure vessels, reactors, heat exchangers, pumps, instrumentation, wiring, valves and piping, mounted within structural steel frame. This frame serves as a support during shipping and also provides access to the equipment for operation and maintenance purposes..