A cylindrical pressure vessel of 2.5m inside diameter, which is closed at both ends, having 12 mm wall thickness operates at 1.5 MPa intemal pressure. The plates are welded on a 30° helical spiral as shown in the figure. Detemine the stresses acting normal and tangential to the weld. Consider the element A drawn below. 30 da = 2.5mm t= 12mm p-1.5MPA

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.