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Pressure Vessel SafetyCase study regarding pressure vessel safety covering causes of failure, safety factors , design consideration, types of stresses & their impacts.

Group MembersAamin Fahad AzizAli HamzaMuhammad Mubtasim Bin TariqSyed Usama MutahirHadia MadniMuhammad Bilal AnjumContentsIntroduction to case studyThe Great Molasses Flood of 1919Volume of Molasses (CSP 2.1)Why vessels are spherical & cylindrical?Mating of spherical and cylindrical partsPressure to Elasticity ratio (CSP 2.7, CSP 2.8)Causes of FailureMethods of manufacturing pressure vesselsResults and recommendations.

Introduction of Case StudyNumerable accidents occurred in past because of pressure vessels failure.Rupture of Apollo oxygen tank in 1970Implosion of USS thresher in 1963Explosion of Russian submarine Kursk in 2001.

The great molasses flood of 191915 January 1919, 6 story tall molasses tank exploded in Boston.Streets swamped with 12000 tons of molasses. 21 causalities and 150 injuries

The Great Molasses Flood of 1919Bostons North End

Volume of Molasses(CSP-1)Molasses is 44 % heavier than waterDensity of molasses in 1441 kg/m312000 tons of molasses are given. We have to calculate the volume of molasses .

AnalysisPressure Vessels Pressure Vessels are structures that are designed to contain or preclude a significant pressure.Types Generally Used

SphericalCylindricalWhy Spherical/Cylindrical?

Spherical/cylindricalLess crack propagation.Presence of membrane stresses.Axial StressHoop StressesRadial Stresses.

FLAT/SQUAREMore Crack Propagation. Re-entrant corners are present. Cracks propagate from Stress concentrations which are present at these corners.Absence of membrane stresses.Other than spherical/Cylindrical flat vessels are possible. Lets compare them

Mating Analysis Cylinders SpheresMating Analysis (Contd)

CS2.8 Radial Deflection per Thickness VS. Pressure to Modulus RatioNow if we were to determine the relationship between radial deflections per unit thickness

and =

Internal Radius = = 108.55 mmThickness = t = 3mmSo = (1309.23)

With 1309.23 as a constant value for this case, we plot radial deflections per thickness against varying pressure to modulus ratio.

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