Question

Asked Mar 19, 2019

A spherical tank has been fabricated by bolting together two hemispherical thin shells with a thickness of 30mm. The pressure in the tank is 1.7 MPa. The tank inner diameter is 8m and is sealed with 900 bolts, each with a diameter of 25mm.

What is the normal stress developed in the tank wall and in each bolt?

Step 1

Check for thin wall:

Determine the ratio of radius of the tank to the thickness of shell.

The thin-wall analysis is valid.

Step 2

Determine the normal stress for the spherical tank’s wall using the formula.

Step 3

Show the free body diagram of the spherical tank as in Figure 1.

The force in each bolt is denoted by Pb, acting downward. The force in 900 bolts is 9...

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