Regarding the late-stage maintenance of heat exchangers.
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The heat exchangers in our factory are at an advanced stage of wear. Out of 100 tubes, 60 have leaks, so they can no longer be cleaned. Do anyone have any good suggestions for maintaining them? The procurement cycle for new heat exchangers is 4 months; how can this period be maintained? Is there any good way? Are there any corrosion and scale inhibition agents available for later stages?
If the operating pressure is ≤6 kilograms, a tubular graphite heat exchanger can be considered
Consider carrying out technical upgrades – what material for the heat exchanger? Will it take 4 months to procure it?
What I want to ask is: if 60 out of 100 heat exchangers are damaged, can it still meet the process requirements? All 60 leaks have been sealed! It is recommended not to continue maintaining such a device; it’s better to replace it right away. If one wants to maintain it, the water flow should be controlled and reduced, and efforts should be made to ensure that the water quality does not become too poor. I can think of no other solutions. What’s the material on the other side?
Out of 100 heat exchangers, 60 of them had leaks, and it wasn’t until then that someone thought to address this issue. It was too late by then; those heat exchangers should have stopped meeting the process requirements long ago. In the chemical industry, when managing equipment, it’s important to pay attention to maintenance records and logs, so as to effectively monitor the condition of the equipment and prevent such situations from occurring. :)
What I want is a solution to the problem, not the reasons. Everyone is off-topic.
Our factory’s approach is to use a reamer to remove the ends of the tubes, then use a sleeve or special tool to drive something from one end to the other. After that, a new tube is installed, and the ends of the tube are connected to the tube sheet either using a tube coupling device or by expansion welding, depending on the required strength. Relevant pressure tests are then conducted on the tube ends; if they pass these tests, it’s fine. In cases where it’s not possible to remove the damaged tube, the end of the tube that is exposed in the tube sheet is trimmed flat, and a tube of a smaller diameter is inserted into the damaged tube, which is then connected using expansion welding. I have discussed these methods in another post; you can refer to it at http://bbs.hcbbs.com/viewthread.php?tid=429077&page=1#pid2360241
It can be cleaned using some specialized solutions, or through other maintenance measures.
Out of 100 tubes, 60 have developed leaks; at this point, you should reduce production to the minimum level required. Specifically, it is necessary to control the pH value of the medium, taking into account your pressure requirements as well as the material of the equipment.
Thank you to the person on floor 7; I’m not able to assign a score. Thank you!!! Are there any corrosion and scale inhibition agents that don’t work through film-forming mechanisms? For example, those that work by reducing the cathodic corrosion current
If 60% of it is lost, it’s better to discard it and replace it with a new one. The heat exchanger has already served its purpose well enough; what’s the point of maintaining it any further?
The method on the 7th floor is great; quickly prepare a few of them so they can be put on right away when needed. Purchase new ones at the same time; it’s best to choose copper tubes for the new ones
Over 10% is basically already planned for an update, while yours has 60% of them perforated... It seems there’s no other option but to update them
If it is a metal tube, why can’t it be cleaned? Weld the ends of the 60 pipes that have leaked shut, and then clean them using a descaling solution through circulation