How to deal with a clogged gate valve?
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In the ethylene plant, the gate valve before the emergency cooling oil pump filter cannot close properly due to clogging by coke; only about two centimeters of clearance remains. Methods such as electric heating have shown little effect. Since the coke is blocking the slide path, it is not possible to remove the emergency cooling oil filter. Is there any way to carry out repairs while the plant is still in operation, aside from shutting it down for maintenance? I would appreciate your advice: Is it possible to clearly identify the clogged material using ultrasound? Are there any other solutions? Plugging the leak under pressure is not feasible due to the medium’s temperature, which reaches 180 degrees Celsius.
It’s best to study the physical and chemical properties of this material. What are the valve port diameter, pressure, and the physical and chemical properties of the material? There is a type of knife-plate valve; it’s not sure whether it can be used (you can find it by looking at images on Baidu by entering the relevant term)
I’m sorry; I meant to handle it online, not replace the valve. I’m not sure if there are any good ways to deal with blocked valve passages online