Design and technology parameters influence on durability for heat exchangers tube to tubesheet joints

13th International Conference on Tribology

Ripeanu, R.G.^1

Petroleum-Gas University of Ploiesti, Mechanical Engineering Department, 39 Bucharest Blvd., Ploiesti

100680, Romania^1

关键词: Corrosion behavior;    Corrosion tests;    Critical zones;    Design and technology;    Industrial water;    Roughness parameters;    Tension and compression;    Welding parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/174/1/012043/pdf
DOI  :  10.1088/1757-899X/174/1/012043

来源: IOP

【 摘 要 】

The main failures of heat exchangers are: corrosion of tubes and jacket, tubes blockage and failures of tube to tubesheet joints also by corrosion. The most critical zone is tube to tubesheet joints. Depending on types of tube to tubesheet joints, in order to better respect conditions of tension and compression, this paper analyses the tubesheet holes shapes, smooth and with a grove, on corrosion behavior. In the case of welding tubes with tubesheet, welding parameters modify corrosion behavior. Were realized welded joints by three welding regimes and tested at corrosion in two media, tap water and industrial water. Were tested also samples made of smooth tubes, finned tubes and tubes coated with a passive product as applied by a heat exchanger manufacturer. For all samples, the roughness parameters were measured, before and after the corrosion tests. The obtained corrosion rates show that stress values and their distribution along the joint modify the corrosion behavior. The optimum welding parameters were established in order to increase the joint durability. The paper has shown that passive product used is not proper chosen and the technology of obtaining rolled thread pipes diminishes tubes' durability by increasing the corrosion rate.