Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Both B & C
Wall thickness is > 30 mm
Material of construction is high alloy steel
Plain carbon steel and cast iron parts are used

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Process Equipment and Plant Design
Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.

Either A or B, whichever is larger
3 times the thickness
Either A or B, whichever is smaller
6% of I.D.

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