Patent ID: 6254930
Filing Date: 2001-07-03
Classification: F28F

Abstract:
A heat exchanger comprising a tube sheet and heat exchanger coolant tubes extending from the tube sheet, the tube sheet and the coolant tubes comprising a coating based on hardening plastic mixtures, the coating obtained by a method comprising:cleaning surfaces provided for the coating using an abrasive; closing coolant tubes inlets with removable plugs; applying at least one layer of a hardening plastic mixture on the tube sheet to form a coating of the tube sheet; allowing the coating of the tube sheet to harden so that additional mechanical processing can ensue, and processing the coated surface of the tube sheet; removing the removable plugs from the coolant tubes inlets; applying at least one layer of a hardening plastic mixture at least in the inlet area of the coolant tubes to form a coating of the coolant tubes, and allowing it to harden; providing that coating of the coolant tubes is being carried out so that the coating of the coolant tubes is bonded chemically to the coating of the tube sheet, and the coating of the coolant tubes in comparison to the coating of the tube sheet exhibits greater elasticity having at least 2% greater elongation at break relative to the elongation at break of the coating of the tube sheet.