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The cistern is

18 m long

3 m in diameter (inner).

It is made of steel with the yield strength of SY= 240MPa.

Safety factor of FY= 1.9;

Total corrosion allowance, c= 3.0 mm;

Welded joint efficiency = 0.85

**Shell thickness, t - 32mm**

Check whether this thickness is sufficient to withstand combined action of the internal pressure, t

he weight of liquid, and the action of longitudinal external forces (tensile or compressive) .

Assume the mass of the train as m= 12 x 10^6kg, deceleration during braking of a = 3m/sec

, and during climbing uphill assume the inclination angle of 10 degrees

I assume there will be 3 design cases for this problem:

Case 1 Internal Pressure+ Weight of Liquid

Case 2Internal Pressure+ Weight of Liquid + Inertia during breaking of the railway cistern

Case 3 Forces acting on the pressure vessel: Internal Pressure + Weight of liquid+ inertia of breaking + inclination angle (locomotive applied to the first cistern in the train)

Wondering if I am going about this correctly?