Riser Coupling Testing

5.1 Purpose of 5.2 Recommended Design Qualification Tests 14 5.3 Optional Qualification NOTE This is the first edition of this recommended practice. It was authorized for publication at the 1983 Standardization Conference and later ratified by letter ballot as detailed in Circ PS 1708. Requests for permission to reproduce or translate all or any part of the material published herein should be addressed to the Director, Production Department, 211 N. Ervay, Suite 1700, Dallas TX 75201.

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RP 2R Design, Rating, and Testing of Marine Drilling Riser Couplings_ the primary member's being joined (interface load). The reaction to this compressive load is tension in another structural member, such as the box or a set of fasteners. 2. Behavior of a Preloaded Coupling The behavior of a preloaded coupling is similar to that of other preloaded mechanical connections this behavior is illustrated in Figure 1 which shows the relationship between coupling internal tensile load and external...

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67 of the material yield stress in accordance with Section 3.8. Note that this maximum stress is the same as that recommended for the riser pipe in RP 2Q for the suspended and hangoff modes. Thus, the riser coupling design load relates to the maximum riser analysis load. While the coupling design load provides a means of grouping coupling models independent of manufacturer or method of makeup, it does not include all loads affecting coupling design. Appropriate auxiliary loads as defined in...

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RP 2R Design, Rating, and Testing of Marine Drilling Riser Couplings ing these properties. Higher quality steels offer the potential to provide improved riser structural integrity. All welds that are in load carrying members of the coupling, including the welds attaching the coupling to the pipe, should be treated as critical. Therefore, proper welding procedures that have been qualified per an established standard such as ASME Section IX should be followed. This assures that important factors...

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The coupling weight for each particular coupling size should be specified. For purposes of comparison, the specified weight of a particular riser coupling is to include the sum of the in-air weights of the structural components (box, pin, etc.) of the coupling, lock mechanisms, auxiliary-line and C& K line support brackets or clamps that support the end extremities. The coupling weight includes the in-air weight of any and all parts that contribute to the submerged, inservice weight of the...

Riser Coupling Rating

The load capacity ratings listed in Table 1 provide a means of general classification of coupling models based on stress magnitude caused by applied load. To qualify for a particular classification, neither calculated nor measured stresses in a coupling may exceed the allowable stress limits of the coupling material when subjected to the design load. The allowable material stresses are established in Section 3.8. Different sizes of the same coupling are to be rated independently. Riser...

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RP 2R Design, Rating-, and Testing of Marine Drilling Riser Couplings require analysis of a 30 sector one-twelfth . The axial loading on such a 30 sector can be considered to be that caused by the design tension, uniformly distributed around the pipe. Determination of the equivalent load for bending is discussed in Section 3.7. The use of finite element analysis permits determination of stresses in complex structures, but accuracy of the analysis is very sensitive to the skill of the analyst....

Nomenclature

The following technical terms which pertain to the description of marine drilling riser couplings generally are defined for clarity. A comprehensive list of definitions pertaining to marine drilling riser systems is contained in RP2Q. Marine Drilling Riser A tubular conduit serving as an extension of the well bore from the equipment on the wellhead at the seafloor to a floating drilling rig. Coupling A mechanical means for joining two sections of riser pipe in end-to-end engagement. Riser Box...

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Buoyancy Buoyancy devices or floatation added to the riser joints to reduce their submerged weight. Coupling design types include, but are not limited to, the following Breech-Block Coupling A coupling which is engaged by partial rotation of one member into an interlock with another. Collet-Type Coupling A coupling having a slotted cylindrical element joining mating coupling members. Dog-Type Coupling A coupling having dogs which act as wedges mechanically driven between the box and pin for...

Riser Coupling Design

The marine riser coupling is in the primary load path of the riser and must be designed to the same loads as the riser pipe. Procedures for determination of those loads are described in API RP 2Q. Riser couplings should also be designed to facilitate use, maintenance and inspection. Guidelines for care and operation are given in API RP 2K. Because of its large slenderness ratio L r , a drilling riser's ability to resist environmental loading depends primarily on tension. The environment...

Figure Combined Net Section And Local Bending Stress Linear Interaction Curve

RP 2R Design, Rating, and Testing of Marine Drilling Riser Couplings crx, tryi crz normal stress in the direction of the indicated subscript rxy, txz, ry2 shear stress in the plane of the indicated subscripts The combined stress, uc, should not exceed the maximum allowable stress, such that, The net section and local bending stresses are not output directly by typical finite element computer programs, but can be readily derived from the stress output that is provided. The stress output provided...