The issue of corrosion margin in jacketed vessels
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For vessels with jackets, the inner cylinder is subject to corrosion from both the medium inside the vessel and the medium in the jacket. In the specification sheet, the corrosion margin value for the inner cylinder is 1: only the corrosion margin due to the medium inside the vessel is taken into account, while when entering the corrosion margin values in the calculation documents, the corrosion margin caused by the medium in the jacket is also added； 2: It is the sum of the corrosion margins of the internal and external media. How do fellow sailors represent this?
In the pattern data sheet, the corrosion margin for the inner cylinder is taken as that of the medium inside the tank only; whereas when entering the corrosion margin in the calculation documents, the corrosion margin of the medium inside the jacket is added as well
I hope more sea friends will join the discussion
We include the corrosion margin on both the inside and outside of the inner cylinder of the jacketed pressure vessel.
In the parameter table, the respective corrosion margins are indicated, while their sum is used in the calculations. But if it is made of stainless steel, the jacket is filled with water. Just write an inner tube.
You can consult the equipment center station to find out how SW6 is taken into account during calculations, in order to avoid excessive consideration of it
The corrosion margin of the inner tube should be included on both the inner and outer surfaces, just as is the case with the tube sheet of a heat exchanger. A zero corrosion margin is another matter.
It is necessary to consider double-sided corrosion when determining the corrosion margin of the inner cylinder