Class 4 (4th Engineer) SC&S 📅 Sep 2023

Exam Question

A double bottom tank is 1.2 m deep and has a sounding pipe extending 11 m above the tank top. The tank is filled with oil (rd 0.89) to the top of the sounding pipe. The double bottom floors are spaced 750 mm apart and are connected to the tank top by riveted angles, the rivets having a pitch of 7 diameters. If the maximum allowable stress in the rivets is 30 MN/m2, calculate the pressure in kN/m on the outer bottom and the diameter of the rivets (16)

Reference Answer

This question is divided into two parts: calculating the hydrostatic pressure on the tank's outer bottom and determining the required rivet diameter based on shear stress limitations on the tank top.
### (i) Pressure on the Outer Bottom
**1. Principle:**
The hydrostatic pressure exerted by a fluid at a certain depth is directly proportional to the vertical height (head) of the fluid column above that point, the density of the fluid, and the acceleration due to gravity. The pressure acts equally in all directions at that depth.

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