clad tbesheet composite tube sheet
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The clad TBSheet composite tube sheet can be made using surfacing welding of WOL or explosive welding of composite plates. When using explosive welding to combine plates, the requirements of grade B1 in NB/T47002.1~47002.4 shall be met ； When the heat exchange tubes are subjected to axial compressive stress, it is advisable to use WOL cladding on the composite tube sheet. Question 1: Under what conditions are the heat exchange tubes exposed to axial compressive stress? Question 2: When the heat exchange tube is under axial tensile stress, should a WOL cladded tube sheet be used, or a burst-clad plate?
This post was last edited by chenbinhuai2013 on 2015-6-25 15:24. Question 1: Under what conditions are heat exchange tubes subjected to axial compressive stress? It is generally in operating conditions where the vacuum in the tube side or the pressure on the shell side is greater than the pressure in the tube side. Question 2: When the heat exchange tube is under axial tensile stress, should a WOL cladded tube sheet be used, or a burst-clad plate? The pressure is high, usually above medium pressure; the medium is extremely hazardous or prone to intergranular corrosion. In addition, in high-temperature conditions, a surfacing structure is generally chosen. Please ask the expert to add more. Thank you.
It seems that the first answer is incorrect. When the pressure on the tube side is greater than that on the shell side, the channel boxes on both sides tend to compress toward the intermediate shell, and the tube bundle is subjected to compressive stress.
This post was last edited by gn_1984 on 2015-6-25 at 10:37. There are discussions in the forum regarding axial compressive stress on heat exchange tubes under shell-side pressure; you can search for them. Please ask experts to help analyze and solve this issue. Thank you @gjyzb