Welding Tube to Tubesheet Joints for Corrosion Resisting Applications
The work in this paper relates to an improved tube to tubesheet joint in a shell and tube type heat exchanger that have dissimilar metallurgies of tube and tubesheet. This improved tube to tubesheet joint configuration will not only impart reliability and strength to the mechanical integrity of the joint but also reduce the costs of the manufacturing without compromising the functional performance of the exchanger. In a shell and tube heat exchanger, generally the material of tubes may be similar to the tubesheet or of a higher corrosion resistant grade in comparison to that of the tubesheet. Conventionally, shell and tube heat exchangers that involve dissimilar materials of tube and tubesheet are either:
i. Tubes welded directly to the tubesheet with matching grade weld metal
or
ii. The tubesheets are clad / weld overlaid with the higher corrosion resistant material or material similar to the tube material
For purpose of this study, we have considered the material of tube as stainless steel type 304L and that of tubesheet as carbon steel.
The above case 1 wherein the SS-304L tubes are directly welded to the CS tubesheet, may have the following advantages:
i. Manufacturing time is less.
ii. Tubes are attached to the base metal and hence free from defects of weld overlay or cladding, if any.
In case 2, wherein the SS-304L tubes are welded to the SS-304L clad / weld overlaid portion of tubesheet, the advantages are:
i. Welding takes place between two austenitic stainless steel grades, hence PWHT is not required.
ii. The tube to tubesheet joint and adjacent material is of austenitic stainless steel grade, hence has better corrosion resistance.
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The main objective of the work done and reported in this paper is to combine the advantages of the above two cases thereby:
i. Reducing the cost of manufacturing
ii. Increasing the mechanical reliability of the tube to tubesheet joint.
Extensive trials were carried out on sample tube to tube sheet joints, the results and conclusions of which are reported in this paper.
Copyright ? 2021 by ASME
广东嘉盛合金材料有限公司 - 外贸销售经理
1 年Hello, I'm Anna from Guangdong Jiasheng Alloy Material Co., LTD. Our company is a professional beryllium alloy manufacturer with many years of experience. Therefore, we would like to take this opportunity to establish business relations with you. Please link to our website :beryllium-alloy.com? If you would like to know more about our products.
Retired Sr.General manager from Jacobs engineering India Pvt Ltd
1 年In high temperature applications in tube side tube sheet and entire channel is refractory lined , ( waste heat boilers ). tube to tube sheet joints make use of thermal sleeves in the form of suitable ferrules. This type of tube to tube sheet joints have their own challenges and there are not many players who are confident enough. Have you also made such type of heat exchangers.
director at tema india ltd
1 年A constant stream of innovation that continues till this day in a life still dedicated to the array of shell and tube exchangers by Mr Sippy. GOD BLESS
Germánico en organización, pragmático en soluciones, perseverante en las metas y latino en la vida personal.
1 年Great job. Congrats