What is the maximum wall thickness for a cylinder to be considered thin-walled?

7% of the inner diameter

Fill in the blank: In a thin-walled cylinder subjected to internal pressure, the circumferential stress σθ can be calculated using the formula σθ = ______.

Pd/2t

True or False: In thin-walled pressure vessels, radial stresses can be significant and must be considered in stress analysis.

False. Radial stresses are generally neglected in thin-walled pressure vessel analysis.

Riddle: I am a type of stress that acts along the circumference of a thin-walled cylinder. What am I?

Hoop stress (σH)

What is the relationship between circumferential stress and longitudinal stress in a thin-walled cylindrical pressure vessel?

The longitudinal stress σL is half of the circumferential stress σH.

Which of the following stresses is constant in a thick-walled pressure vessel? A) Circumferential B) Longitudinal C) Radial D) None of the above

B) Longitudinal

Fill in the blank: The tensile yield stress for a mild steel pressure vessel must be at least ______ MPa to ensure safety.

385 MPa

True or False: The hoop stress in thick-walled cylinders is maximum at the outer surface.

False. The hoop stress is maximum at the inner surface.

Riddle: I am the stress found in a sphere subjected to internal pressure, equal in all directions. What am I?

Principal stress

In the context of pressure vessels, what does the term 'joint efficiency' refer to?

The effectiveness of a welded or riveted joint compared to the strength of the base material.