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Chemical Engineering Basics

Q1:

Pick out the wrong statement.

A For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1.

B For calculating forces and efficiency of rivetted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work.

C Longitudinal joint is normally made butt joint to maintain the circularity of the vessel.

D Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm.

ANS:B - For calculating forces and efficiency of rivetted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work.

The incorrect statement is: "Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm." Typically, the maximum diameter of the opening in a pressure vessel that doesn't require compensation is governed by various standards and regulations, depending on factors such as vessel size, pressure, and application. There's no universal rule that specifies a maximum diameter of 200 mm for all cases.



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