The spherical gas tank is fabricated by bolting together two hemispherical thin shells. If the 1 m inner radius tank, and 15 mm of thickness, is to be designed to withstand a gauge pressure of 10 Mpa, determine the minimum number of 20 mm diameter bolts that must be used to seal it. The bolts are made from a material having allowable stress of 200 Mpa. Select one:

The pressure tank is fabricated from spirally wrapped metal plates that are welded at the seams in the orientation shown. The tank has an inside diameter of 700 mm and a wall thickness of 8.9 mm. For a gage pressure of 1.27 MPa, determine (a) the normal stress perpendicular to the weld (use positive for tension, negative for compression) and (b) the shear stress (absolute value) parallel to the weld. Assume = 51. s Answers: (a) Normal stress= (b) Shear stress - MPa MPa

A cylindrical pressure vessel is fabricated from steel plating that has a thickness of 20 mm. The diameter of the pressure vessel is 450 mm and its length is 2.0 m. Determine the maximum internal pressure that can be applied if the longitudinal stress is limited to 140 МРа, and the circumferential stress is limited to 60 МРа. A spherical shell with 70-in. outer diameter and 67-in. inner diameter contains helium at a pressure of 1200 psi. Compute the stress in the shell.

The pressure tank shown is fabricated from spirally wrapped metal plates that are welded at the seams at an orientation of Assume B = 62.5. The tank has an inside diameter of d- 1800 mm and a wall thickness of t-7 mm. For a gage pressure of p-0.8 MPa, determine (a) the normal stress perpendicular to the weld and (b) the shear stress parallel to the weld. (a) on MPa (b) Tnt" MPa

A steel pipe 1.5m in diameter is required to carry an internal pressure of 750kPa. If the allowable tensile stress of steel is 140 MPa, determine the required thickness of the pipe in mm.

45° -1.25 m

Deep sea pipelines are used to transport oil and gas across large distances, at depths greater than 2km. The pipes are typically made from high grade steel plate (X80), which is bent, then seam welded to produce a section of pipe. During installation, sections of this pipe are welded together. In deep water, installation is usually conducted using the J-lay system. In the J-lay system, a string of pipe is hung from a barge, and allowed to fall to the sea floor, forming a J-shaped string. As the pipe is lowered, new sections are welded to the end of the string, and the barge moves forward. This system enables a good degree of accuracy in placing the pipe, and requires a less powerful ship than other laying systems. It does, however, place significant loads upon the pipe itself. 2000m Tmin=400m Pipeline m

Mechanics of materials II

The piston-cylinder assembly above has a wall thickness of 0.125" and an outer radius ro= 2 in. If the internal gauge pressure is 1.2 ksi, determine the maximum normal stress in the piston wall. 18 ksl O9 ksi 36 ksi N/A (this does not meet the criteria of a "thin-walled" pressure vessel)

The pressure tank shown is fabricated from spirally-wrapped metal plates that are welded at the seams in the orientation shown. The tank has an inside diameter of 48 in. and a wall thickness of 0.375 in. Determine the largest allowable gage pressure if the allowable shear stress parallel to the weld is 3.10 ksi.