The large tubular heat exchanger widely used in industrial fields of petroleum, chemical and steel. Its high technical requirements and manufacturing is difficult, so now only a few countries in the world can be successfully developed，The shell side of the tubular heat exchanger is 20000 mm, the shell side cylinder diameter is 4000 mm, tube bundle 6283 root, bundle length is 20003 mm, equipment total length is 43725 mm, heat exchanger area is 12325 m², and the weigh is about 370 tons. It's known as the "big brother" of tubular heat exchanger.