Which equipment needs passivation after the atmospheric and vacuum distillation unit is shut down
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Previously, the towers were steamed and cleaned after shutdowns, but now the company emphasizes safety – which parts need to be passivated?
Since we process a type of crude oil that is low in sulfur, we have not had any coking equipment throughout the more than ten years since the plant was built, nor have we experienced any incidents related to ferrous sulfide.
Bottom stream of atmospheric tower and vacuum tower.
Passivation – that’s too advanced. After shutting down the equipment, the main concern is ferrous sulfide. The manhole needs to be opened and left open for a week. Not to mention, if the interior of the tower doesn’t have a 304 lining; if there really is no such lining, then keep the reflux pump running at the top of the tower and fill the reflux tank with water. If a fire starts, simply turn on the pump. For passivation, you first need to clean the inside of the container before applying passivation, otherwise oil and rust on the surface will prevent it from being effective. But what’s the point of carrying out passivation after removing the oil? Ferrous sulfide has already been removed. I don’t understand the logic behind your production process; maybe I just lack experience