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Quotes - Engineering - SalesChemical Processing
Aggressive Chemistry and Corrosion
Chemical processing covers interchangers, brine heating and cooling, acid duty, gas scrubber service, salt refining and process water isolation. What they share is that material selection is the design problem.
Select against the film. The first liquid to condense or the last to evaporate concentrates whatever is aggressive into a small volume at the surface. That film, not the bulk analysis, is what corrodes.
Alloys available. 304 and 316 stainless for general duty, titanium for chlorides, Hastelloy and Incoloy for acids and high temperature. Gasket compound is selected alongside, and it is frequently the binding constraint rather than the plate.
Tanks and reactors. Where the fluid cannot be pumped through an exchanger, Temp-Plate immersion and jacket assemblies put heat transfer into the vessel, fully welded with no elastomer to attack.
Typical Specification
- Typical duty: Interchangers, brine, acid, scrubbers, salt refining
- Plate materials: 304, 316, titanium, Hastelloy, Incoloy
- Gaskets: Compound selected against the process and cleaning chemistry
- Selection basis: Film chemistry at the surface, not bulk analysis
- Vessel duty: Temp-Plate immersion and jacket assemblies
- Solids: Free-Flow plate where particulates are present
- Pressure: Frame selected for the design pressure
- Cleaning: Frame opens for inspection and mechanical cleaning
- Containment: Interspace vented; double-wall where required
- Documentation: Material certificates supplied
Common FAQs
By the attacking species, its concentration at the surface and the temperature, rather than by general severity. Send the stream composition including trace species and the operating range.
More often the gasket. Plates have a wide alloy range; elastomers have narrow temperature and chemical windows. Where gaskets are the constraint, semi-welded or Temp-Plate construction removes them.
Yes, with a Temp-Plate immersion assembly. Fully welded with no gaskets, in whatever alloy the chemistry requires, which is why plating and pickling tanks use them widely.
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