Reasons for frequent cavitation in the bottom pump of the vacuum tower in the lubricating oil hydrogenation unit
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As the title suggests, recently the bottom pump of our lubricant hydrogenation unit has been experiencing unexpected vacuum conditions; the problem is resolved as soon as the outlet valve is closed. The operating pressure in the vacuum tower is 11 KPa, the temperature at the bottom of the tower is around 280 degrees Celsius. The oil in question is a lubricant component with a viscosity of 6 CST, while the temperature of the stripping steam is 180 degrees Celsius. The designed flow rate of the pump is 20 cubic meters per hour, but the actual flow rate is around 5 tons per hour. Help analyze it.
The inlet filter is clogged, or the inlet pipeline is designed to be too narrow
The inlet filter is not clogged; if the filter or the pipes upstream of it are blocked, it won’t return to normal right after the air is removed.
Water in the steam has been removed; the drain valve before the steam control valve is open, and no water is coming out.
Check whether there is water in the filter screen and oil samples through testing, and you can switch to the backup pump for testing as well~~~