... , bubble caps, tubing, reaction vessels, distillation columns, heat exchangers, transfer piping, and valves.Nuclear - reactor-core and control- ... rod components. Environmental control system - heat-exchanger tubing.Available ... ASTM B 366/ASME SB 366 (Fittings), ISO 4955A (Heat Resisting Steels & Alloys), DIN 17744 (Chemical composition of ...