Abstract: A method of manufacturing a plate heat exchanger. The method of manufacturing a plate heat exchanger includes the steps of: electroplating a surface of a mold having a groove pattern formed on a surface thereof to form a plate; separating the plate from the mold; electroplating both sides of the separated plate with a brazing binder to form a plate unit; stacking the plate units such that grooves formed on the plate units intersect each other; and heating and pressing the stacked plate units to bind them each other.

Abstract: A method of joining tubes that are regularly arranged in a shell & tube heat exchanger to tube sheets placed at opposite ends of the tubes and a shell & tube heat exchanger produced by the method. The method of joining the tubes to the tube sheets includes: forming a tube sheet groove in a surface of the tube sheet at a location spaced apart from a tube insert hole of the tube sheet by a predetermined distance, and forming a tube holding groove in an inner surface of the tube insert hole; inserting the tube into the tube insert hole of the tube sheet and expanding the tube; and performing both tube side welding and shell side welding so as to join the tube to the tube sheet.

Abstract: A method of joining tubes that are regularly arranged in a shell & tube heat exchanger to tube sheets placed at opposite ends of the tubes and a shell & tube heat exchanger produced by the method. The method of joining the tubes to the tube sheets includes: forming a tube sheet groove in a surface of the tube sheet at a location spaced apart from a tube insert hole of the tube sheet by a predetermined distance, and forming a tube holding groove in an inner surface of the tube insert hole; inserting the tube into the tube insert hole of the tube sheet and expanding the tube; and performing both tube side welding and shell side welding so as to join the tube to the tube sheet, wherein the shell side welding is performed by inserting a welding torch into the tube.

Abstract: Disclosed are a dimethyl ether (DME)-floating, production, storage and offloading (FPSO) system that can be used in offshore oil fields or stranded gas fields and a method for producing dimethyl ether using the same. More particularly, the disclosure relates to a DME-FPSO system capable of producing dimethyl ether from gas extracted from stranded gas fields or from associated gas extracted from oil fields, which includes a reforming reactor and a dimethyl ether reactor equipped offshore, and a method for producing the same.