Heat exchange tube extension length
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The maximum heat exchange tube in the GB151 list is φ57, but the heat exchange tube I am using now is φ89, so what is the minimum extension length of my heat exchange tube and the minimum groove depth of the tube plate? This post was last edited by jia717 on 2009-2-25 18:37 ]
What is the connection method between the tube plate and the heat exchange tube mentioned by the poster? The connection methods are different and the values are also different. If strength welding and expansion are used, I think the minimum extension length of the heat exchange tube should be the wall thickness of the heat exchange tube, and the groove depth should be 2.
We use expansion joints, the extension length of the heat exchange tube is 0-3mm, and the groove width is 1mm. The diameter of our heat exchange tubes is relatively small, the largest one is only 19mm.
You can refer to GB16508 "Calculation of Strength of Pressure Components of Shell Boilers". These data have detailed regulations according to different smoke temperatures.
I use strength welding. The size of your pipe is the bevel size from φ16 to φ25, which is very different from φ89. If the minimum extension length is determined by the wall thickness, it is still ok. This post was last edited by 0536dai on 2009-2-25 15:26 ]
You can refer to the requirements for heat exchange tube φ57 in the GB151 list. When the heat exchange tube is φ89, there is no harm in extending the heat exchange tube to a larger length. It is resistant to erosion and corrosion. Of course, in the case of a horizontal heat exchanger, there is no worry about liquid accumulation.
My current cooler is vertical, so there is a gap between the lower tube plate and the pipe. In order to prevent liquid accumulation, do fillet welds have to be used on both sides of the lower tube plate? There are also vertical ones. Is it feasible to use expansion joints? If possible, what is the tolerance fit between the tube sheet and the tube?
Our company usually only needs to protrude one millimeter for welding. If it is a copper pipe, after expansion, the pipe must be cut flat to the tube plate surface for better appearance.
It doesn't matter if it is vertical, as long as the extended length does not hinder the welding. If you are afraid of liquid accumulation, you can fill the gap between the upper tube plate with refractory cement or other suitable things after the welding pressure test. This can also play other roles in some cases. Of course, expansion joints can also be done this way. This post was last edited by xbxmys on 2009-3-1 21:44 ]
The pipe protrudes 1.5mm and the depth of the break is 2mm 45 degrees
For design, you can refer to the TEMA standard, but the TEMA standard is looser than GB151. The extension length of the pipe end depends on the connection method with the tube plate. Generally, the extension of the sealing weld is shorter than the strength welding, which is generally 1~3mm. You can refer to the corresponding data of 151. As for the overall design, refer to the TEMA standard and you should have a systematic answer. When I listened to the foreigner's lecture the day before yesterday, it seemed that TEMA's cooling pipe could reach a maximum of 89