4 replies to this topic

[fallah]

Dear all

What is the main reason(s) considering all internals(removable or unremovable) of the some Drums in Stainless Steel, while its shell is from Carbon Steel?

Regards

[djack77494]

What is the main reason(s) considering all internals(removable or unremovable) of the some Drums in Stainless Steel, while its shell is from Carbon Steel?

fallah,
A common situation would be to have a realtively thick shell and heads, which are the pressure containing portions of the vessel, and thin internals. Despite the lack of "bulk metal", the functioning of the internals is often critical. A vessel demister is an excellent example. While small amounts of corrosion on the vessel walls are probably quite tolerable, such would not be the case with some internal components. The solution is to build them of an alloy material, thereby dodging this problem.
Doug

[mishra.anand72@gmail.com]

Cost effective measure. Process fluid, temperature and pressure decides a lot as far as MOC is concerned. Are you interested in getting straight answer or reading lectures given by people who are good at it.

March.

[fallah]

Dear Doug

Thanks a lot.How about the material of the internal welded parts such as baffles?

Thanks

[djack77494]

Thanks a lot.How about the material of the internal welded parts such as baffles?

fallah,
There are no general answers to your question. Non-pressure bearing components are often thin and offer a high surface area relative to their volume/mass. Corrosion and erosion are therefore much bigger issues; strength is a much lesser issue. Those factors push in the direction of alloy materials, but ultimately the vessel and its internals should be built for low cost AND suitability for purpose.
Doug