Profile: Applied Fabrication & Field Services is a manufacturer of ASME coded pressure vessels, API STD tanks, heat exchanger's and exchanger component as well as general structural and piping fabrication & field installation. The model 504 units are designed to be self-supporting by use of a diesel engine with spark arrestor, or by an 18 H.P. piston type air motor. The air motor requires simple air source such as plant air or a portable air compressor.