PROCESS OF MANUFACTURE OF HEAT EXCHANGER TUBE FOR LNG VAPORIZER AND HEAT EXCHANGER TUBE FOR LNG VAPORIZER

摘要

PROBLEM TO BE SOLVED: To provide a process of manufacture of heat exchanger tube for LNG vaporizer and a heat exchanger tube for LNG vaporizer superior in peeling resistance in a sacrificial anode coating layer even in the case that a flow speed of dropped sea water is increased and a continuous long hour operation is carried out.SOLUTION: This invention relates to a process of manufacture of an open-rack type heat exchanger tube for LNG vaporizer with surface roughness of an interface between a base material 2 and a sacrificial anode coating layer 3 of Al alloy heat exchanger tube 1 being an average roughness Ra: 5 to 50 μm, maximum valley depth Rv: 30 to 400 μm characterized in that at least one grain size of grain size Nos.14 to 24 is selected, blast powder further adjusted to cause a configuration rate more than 1000 μm of grain diameter in the selected grain size to be 80% or higher is applied to cause the outer surface of the base material 2 of the heat exchanger tube 1 to be blasted.