Hydrocracking maintenance – seeking help
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Dear seniors, the hydrocracking unit is scheduled for maintenance. Is it necessary to open and inspect the hot high-pressure section and the cold high-pressure section? What problems could arise? Additionally: Since high-temperature exchange is scheduled for maintenance, is it necessary to neutralize and wash with alkali first? Thanks first
We need to analyze each case individually; we are not planning to clean the components that undergo frequent replacements, only to provide nitrogen protection for them.
It is necessary to open it and check for any damage to the foam breaker screen, clean the bottom of the tank, and clear the outlets for various liquid levels and interfaces to prevent blockages that could lead to inaccurate measurements. Precautions: If possible, it is essential to carry out passivation cleaning using ferrous sulfide to prevent spontaneous combustion of ferrous sulfide after the manhole is opened.
The hydrocracking unit is scheduled for maintenance, and it is necessary to open and inspect the hot high-pressure separator and the cold high-pressure separator. The following issues may occur: 1. Damage to the foam breaker, as well as blockages of the foam breaker mesh by impurities such as carbon powder； ⒉Blockage at the inlet and outlet of the level gauge ； ⒊There are cracks on the inner wall ； ⒋There are debris and such at the bottom of the tank. : High-temperature conversion is scheduled for maintenance – is it necessary to neutralize and wash with alkali first? It is necessary, as there is ferrous sulfide inside the heat exchanger; if neutralization and alkaline cleaning are not carried out before maintenance, the passivation cleaning process will cause ferrous sulfide to react, resulting in damage to the heat exchanger. This post was last edited by Zhongyuanren on 2009-2-3 20:44]
I’m not sure whether it’s medium-pressure or high-pressure hydrocracking? Considering the high pressure, I agree with analyzing the specific situation on the 2nd floor on a case-by-case basis. If high-pressure areas require maintenance, such as inspections of pressure vessels, then they have to be opened; high-pressure areas may also need to be neutralized and cleaned. If conditions permit, clean it; if not, wait until the tube bundle is removed and then clean it immediately, as after all, corrosion by polysulfuric acid does not occur overnight. This post was last edited by johnhwa on 2009-2-3 20:42]