2.99 See Answer

Question: A steel riser pipe hangs from a

A steel riser pipe hangs from a drill rig located offshore in deep water (see figure). Separate segments are joined using bolted flange plages (see figure part b and photo). Assume that there are six bolts at each pipe segment connection. Assume that the total length of the riser pipe is L = 5000 ft; outer and inner diameters are d2 =16 in. and d1 = 15 in; flange plate thickness tf = 1.75 in; and bolt and washer diameters are db = 1.125 in, and dw = 1.875 in, respectively. (a) If the entire length of the riser pipe is suspended in air, find the average normal stress s in each bolt, the average bearing stress sb beneath each washer, and the average shear stress t through the flange plate at each bolt location for the topmost bolted connection. (b) If the same riser pipe hangs from a drill rig at sea, what are the normal, bearing, and shear stresses in the connection? Obtain the weight densities of steel and sea water, Appendix I. Neglect the effect of buoyant foam casings on the riser pipe.
A steel riser pipe hangs from a drill rig located offshore in deep water (see figure). Separate segments are joined using bolted flange plages (see figure part b and photo). Assume that there are six bolts at each pipe segment connection. Assume that the total length of the riser pipe is L = 5000 ft; outer and inner diameters are d2 =16 in. and d1 = 15 in; flange plate thickness tf = 1.75 in; and bolt and washer diameters are db = 1.125 in, and dw = 1.875 in, respectively.
(a) If the entire length of the riser pipe is suspended in air, find the average normal stress s in each bolt, the average bearing stress sb beneath each washer, and the average shear stress t through the flange plate at each bolt location for the topmost bolted connection.
(b) If the same riser pipe hangs from a drill rig at sea, what are the normal, bearing, and shear stresses in the connection? Obtain the weight densities of steel and sea water, Appendix I. Neglect the effect of buoyant foam casings on the riser pipe.


A steel riser pipe hangs from a drill rig located offshore in deep water (see figure). Separate segments are joined using bolted flange plages (see figure part b and photo). Assume that there are six bolts at each pipe segment connection. Assume that the total length of the riser pipe is L = 5000 ft; outer and inner diameters are d2 =16 in. and d1 = 15 in; flange plate thickness tf = 1.75 in; and bolt and washer diameters are db = 1.125 in, and dw = 1.875 in, respectively.
(a) If the entire length of the riser pipe is suspended in air, find the average normal stress s in each bolt, the average bearing stress sb beneath each washer, and the average shear stress t through the flange plate at each bolt location for the topmost bolted connection.
(b) If the same riser pipe hangs from a drill rig at sea, what are the normal, bearing, and shear stresses in the connection? Obtain the weight densities of steel and sea water, Appendix I. Neglect the effect of buoyant foam casings on the riser pipe.





Transcribed Image Text:

Flange plate (t), typical bolt (de), and washer (d) Flange plate on riser pipe dw L 60° Flange plate on riser pipe- plan view (n= 6 bolts shown) Riser pipe (dz, di. L) (a) (b) am70/Shutterstock.com


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2.99

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