New PDF release: API RP 2A-LRFD Recommended Practice for Planning, Designing

By American Petroleum Institute

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Extra info for API RP 2A-LRFD Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms - Load and Resistance Factor Design

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Example:The lowest speed of a lathe is 20 rpm. The highest speed is 225 rpm. There are 18 speeds. Find the ratio between successive speeds. —A straight line is a line between two points with the minimum distance. Coordinate System: It is possible to locate any point on a plane by a pair of numbers called the coordinates of the point. If P is a point on a plane, and perpendiculars are drawn from P to the coordinate axes, one perpendicular meets the X–axis at the x– coordinate of P and the other meets the Y–axis at the y–coordinate of P.

The line passing through the focus perpendicular to the major axis is called the latus rectum. The line passing through the center, perpendicular to the major axis, is called the minor axis. The ellipse is the locus of points such that the sum of the distances from the two foci to a point on the ellipse is 2a, thus, PF1 + PF2 = 2a Y Minor axis P b V1 (h, k) F1 V2 Major axis F2 2 c 2= a 2 − b e=c/a c a Latus rectum Latus rectum X Ellipse 2 2 y – k) - = 1 ( x – h ) - + (----------------If (h, k) are the center, the general equation of an ellipse is -----------------2 2 a b 2 2 a – b , is always less than 1.

2388 inches. 3638 inches. 4231 inches. —The method of constructing an approximate ellipse by circular arcs, described on page 63, fails when the ratio of the major to minor diameter equals four or greater. Additionally, it is reported that the method always draws a somewhat larger minor axes than intended. The method described below presents an alternative. An oval that approximates an ellipse, illustrated in Fig. 38 r = -------  --- 2A  B (1) where A and B are dimensions of the major and minor axis, respectively, and r is the radius of the curve at the long ends.

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API RP 2A-LRFD Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms - Load and Resistance Factor Design by American Petroleum Institute

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