By Charles Sparks
The writer has written this definitive paintings at the basics of riser mechanics, with the purpose of accelerating knowing of many elements of riser static and dynamic habit. This booklet relies at the author’s 28 years of expertise with riser research and, particularly, on his earlier guides, a few of that have develop into classics of riser literature. easy ideas are in actual fact validated utilizing numerous various complementary techniques and the first parameters that effect riser habit are pointed out. This e-book is a must-own, for someone who offers with riser layout and research or with riser know-how, from the school room pupil to the offshore drilling platform engineer.
SI Unit Equivalents
desk of Contents
2. Pipe and Riser Deflections and worldwide balance: The powerful stress inspiration
three. software of powerful rigidity: widespread problems and specific circumstances
four. Pipe and Riser Stresses
five. Pipe and Riser traces
6. Tensioned-Beam habit
7. Statics of Near-Vertical Cables
eight. Near-Vertical Riser Static habit
nine. tension Joint layout
10. Riser Bundles: neighborhood Bending among courses
eleven. Near-Vertical Risers linked to Floating systems with Stiff Tensioners
12. metal Catenary Risers
thirteen. Axial Vibrations of fastened Risers
14. Axial Vibrations of Hung-off Risers
15. Transverse Modal Vibrations of Near-Vertical Risers
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Extra info for Fundamentals of Marine Riser Mechanics - Basic Principles and Simplified Analysis
The effective tension, at any point along a riser, can be obtained most simply by considering the equilibrium of the segment between the point and the riser top end, taking into account the riser top tension and the segment apparent weight. 6). Effective Tension—a Physical Interpretation/Deﬁnition The interpretation that can be given to the effective tension equation depends on how it is derived. 6). However, they will not immediately be able to deduce the effect of those pressures on tubes of other geometries, made of nonelastic materials, subject to large deflections.
50 3 – Application of Effective Tension: Frequent Difﬁculties and Particular Cases The only way the tube can increase in volume is by buckling, which allows the tube end to slide partially out of its housing at the expansion joint. Forces in connectors Figure 3–7a shows schematically a bolted connector, and figure 3–7b shows a lugged connector of the breechblock type in the closed position with the lugs engaged. The problem is to calculate the forces in the bolts and lugs, which in both cases depend on the dimensions of the connector seal.
Tt Tt Wt + Wi (We ight of riser plus internal fluid contents) We (We ight of displaced fluid) . - . = Tt w piAi Riser segment . Wa = Wt + Wi - We (Apparent weight) Te = Ttw - piAi + pe Ae (Effective tension) pe Ae Equivalent system Displaced fluid column Fig. 2–10. Forces and pressures acting on a long riser segment 35 Fundamentals of Marine Riser Mechanics Figure 2–10 is similar to figure 2–6 but drawn for the whole upper segment of riser above some section of interest. The left hand sketch of Figure 2–10 shows the forces that maintain the upper segment in equilibrium.