How to deal with this leak?
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During our unit’s recent production process, a leak was detected near the regeneration slide valve, on the regenerated inclined tube; catalyst was leaking out (not too severely). It is suspected that the lining has worn away and caused the leak. I would like to ask for advice on how to address this issue.
Weld a box to the outer wall, line it inside, and then seal it properly. We have done this before.
It can be determined whether the lining has come loose by checking whether the leakage area appeared red during inspections carried out by the operator on duty before the leak occurred； If the lining has not come off, it is sufficient to weld a thick sheet of steel in place to seal the leak. If the lining has come off and causing a leak, it depends on the size of the area where it has come off; in such cases, a box with a lining must be created and welded at the site where the lining is missing.
That’s great; my unit only has boxes welded on the outside without any lining. Thank you for your answer.
First, check for wear inside (use a temperature gun to measure the wall temperature; hot spots can also be checked at night). If a large area of the lining has come off, a box can be used for protection, but a lining is still necessary (apply the lining after the box is ready). One or two venting points should be provided depending on the size of the box. If it is only a small area, a reinforcement plate can be welded externally directly (along with a vent valve).
The box contains two DN25 valves, one for steam and one for venting.
At night, turn off the tower light and check; if the pipeline turns red, it indicates that the lining has worn through, and an iron plate can be added on the outside.
Seal the box and introduce steam to keep the wall temperature from rising too high, thereby preventing more severe leaks; however, this is only a temporary solution. It is necessary to conduct more thorough inspections depending on the situation, and if the leakage is severe, operations should be stopped for repairs.
Use a box-type patch; steam is introduced into this patch for cooling (two DN25 pipelines are used, one for supplying steam and the other for local venting, which yields good results).
A nut can be welded at the leak point, and then a bolt can be screwed on and welded there; if it’s not possible to repair it, just cover it with a box
It’s usually just handled by wrapping it in a box. First, assemble the lining and place it in a box, leaving a few small openings in the box, and then weld it. By the end, the lining is basically dry, and then the reserved opening is welded shut. Prevent the moisture in the box lining from vaporizing and causing an explosion.