Process Equipment and Plant Design
In the design of a shell and tube heat exchanger, the corrosion allowance

For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm
Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc
For internal cover and tube sheet is provided on both the sides
All of these

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Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Perferably flow outside the tube
Flow at a very slow velocity
Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Preferably flow inside the tube for its easier internal cleaning

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