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1st Edition, January 1977

Complete Document

Bulletin on Comparison of Marine Drilling Riser Analyses

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Product Details:

  • Revision: 1st Edition, January 1977
  • Published Date: January 1977
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: American Petroleum Institute (API)
  • Page Count: 13
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:


The physical layout of the cases described here is assumed to be two-dimensional-in a vertical plane with all forces and elements lying within the plane Figures 1 and 2 are a typical riser configuration and a cross section of the riser respectively These figures identify major components and define various measurements.

The sixteen-inch riser is assumed to contain mud only-with no drill pipe or other internal connections The riser is attached at its lower end to a pin connection referred to as a lower ball joint At its top, it is restrained by another pin connection, the support ring Both joints are frictionless, and for simplicity, the slip joint is assumed to have the same physical properties as the rest of the riser The riser has no upper, or intermediate, ball joint.

Furthermore it is assumed that all cases are for a semi-submersible drilling vessel with the upper end of the riser exposed to wave forces Wave and current forces are assumed to act in the same direction-this direction is defined as the direction of the positive offset Choke and kill lines are "broadside" to waves and current, as shown in Figure 2, and assumed to contribute no stiffness to the rise.