Can corrosion leaks at the manhole on top of the HPF desulfurization tower be welded?
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Our coking plant uses HPF desulfurization towers, and there is a small leakage caused by corrosion and perforation in the manhole of the mist capture layer at the top of the desulfurization tower. Since explosive gases such as gas and NH3 are present in the fog capture layer (in the positive pressure zone), may I ask whether the manhole here can be welded directly? Is there a possibility of an explosion?
Welding a corroded and perforated manhole directly onto a desulfurization tower is risky, especially when flammable or explosive gases (such as coal gas, NH3, etc.) are present inside the tower. Emergency welding operations can cause gases to ignite or explode, potentially causing serious harm to workers and equipment. Before carrying out welding, you need to ensure that the gases inside the desulfurization tower have been completely removed or reduced to safe concentrations. This can be achieved by filling the inside of the desulfurization tower with air, or even using an inert gas (such as nitrogen) as a flushing medium. After welding, it is also very important to check for integrity and conduct pressure tests to ensure the sealing quality and durability of the welded area. Additionally, before carrying out any welding operations, all safety procedures must be carefully considered and followed. This includes, but is not limited to, using the correct equipment, having appropriate training and knowledge, and ensuring that all safety measures are properly implemented and adhered to. Of course, the best course of action should be provided by professional engineers or consulting firms, who can directly assess the condition of the equipment and offer the most suitable solution. .
Can it be welded directly online?
No!! If the stress is low, metal anti-corrosion repair is recommended.