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English Translations » 【换热设备】 » What should be done if the heat exchange tubes are welded th

What should be done if the heat exchange tubes are welded through during welding to the tube sheet? l

2017-09-07 View Original

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Have you ever encountered the situation where, when welding the tube sheet to the heat exchange tubes, those tubes get welded through? How should this be dealt with? Since the standard does not allow for welding repairs to the heat exchange tubes, the first approach is to replace them. The problem is that due to the special material of the heat exchange tubes, the procurement period is long, and the delivery deadline for the equipment is tight; as a result, some people proposed to carry out patch welding on these tubes. After the patch welding, the joints passed the non-destructive testing, and the heat exchanger also passed the hydraulic testing without any leaks. Is such a treatment acceptable? Is there any evidence? Or what kind of procedure is needed to ensure it? Thank you to all the sea friends for their valuable suggestions.
Reply #2 2017-09-07
When purchasing materials, it is necessary to consider a certain margin; at least two additional heat exchange tubes should be ordered. If the number of damaged tubes is small, it is possible to remove some tube ends and splice together sections of tube. Besides, welders should first take exams or undergo mock training; how can they start working on actual products right away when it comes to special materials?
Reply #3 2017-09-07
This post was last edited by zdl1966 on 2017-9-7 19:59. What I saw was: replacing the heat exchange tubes. There are cases where it was directly blocked within the design margin.
Reply #4 2017-09-07
See if the tube end can be melted directly; it’s a type of welding that involves melting the tube end
Reply #5 2017-09-07
If the amount is small, it gets blocked right away; the design includes a margin for safety.
Reply #6 2017-09-08
Self-fluxing welding is not suitable for duplex steel.
Reply #7 2017-09-08
We have carried out patch welding; of course, replacing the pipe would be the best option if conditions permit
Reply #8 2017-09-08
It has been replaced once; the material is of the S31803 grade, which is a foreign-made grade and difficult to obtain, with a long procurement time.

Translated at 2026-07-21 04:29:08

Original: https://bbs.hcbbs.com/thread-1840758-1-1.html

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