Status: Alert Withdrawn. Norwegian title: Marine Drilling Riser Couplings. English title: Marine Drilling Riser Couplings. Item type: Standard (Kun elektronisk). Tensile test, performed in accordance with the API Spec. 16R standard, is used to verify whether the design of key load bearing parts of the marine riser, such as. As recommended by API Spec 16R, the stress linearization and classification in one of the key steps to design a riser connector. The designers are encountering .
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API Product Specification
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API Spec 16R (R)
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Coupling capacity ratings are established to enable the grouping of coupling models according to their maximum stresses developed under speci?
E Rockwell Hardness and Rockwell Super? Section 3 contains a description of the function of marine riser couplings, along with the de?
Section 4 includes service classi? Spc and welding requirements are included in Section 5 and dimensions in Section 6. Section 7 covers quality control. Appendixes A, B, and C provide analysis, testing, spsc design, information.
API Product Specification
The coupling box or pin zpi on design type provides a support to transmit the weight of the suspended riser string to the riser handling spider while running or retrieving the riser. Additionally, the coupling may provide support for choke, kill and auxiliary lines, and load reaction for buoyancy devices. A comprehensive list of de? An external conduit excluding choke and kill lines arranged parallel to the riser main tube for enabling? Examples of these lines include a control system?
Devices added to the riser 116r to reduce their submerged weight. External conduits, arranged parallel to the main tube, used for circulation of? Choke apk kill lines are primary pressure-containing members. A mechanical means for appi two joints of riser pipe end-to-end. A tubular conduit serving as an extension of the wellbore from the well control equipment on the wellhead at the sea?
The latest edition of these standards shall be used unless otherwise noted. Compressive bearing load developed between box and pin members at their interface; this is accomplished by elastic deformation induced during makeup of the coupling.
A nominal applied loading condition used during coupling design, analysis, and testing based on a maximum anticipated service loading. Under the rated working load, no average section stress in the riser coupling shall exceed allowable limits established in this speci?
The female coupling apo. A section of riser pipe having ends? The basic pipe from which riser joints are fabricated. The male coupling member.
Equal to the local peak alternating stress in a component including welds divided by the nominal alternating stress in the pipe apec at the location of the component. This factor is used to account for the increase in the stresses caused by geometric stress ampli?
Riser pipe outer diameter and wall thickness or wall thickness range for which the coupling is designed shall be documented. To qualify for a particular rated load, neither calculated nor measured stresses in a coupling shall exceed the allowable stress limits of the coupling material when subjected to the rated load.
The allowable material stresses are established in 4. The rated loads are 1r6 follows: SAF is a function of pipe size, and wall thickness.
It is calculated as follows: The manufacturer shall document the rated internal working pressure for each coupling design. Coupling design types include, but are not limited to, the types de? A coupling which is engaged by partial rotation of one member into an interlock with another. A coupling having a slotted cylindrical element joining mating coupling members. A coupling having dogs which act as wedges mechanically driven between the box and pin for engagement.
A coupling having two? A coupling having matching threaded members to form engagement. Environmental zpi includes the 166r forces of current and waves and the motions induced by the? The determination of a riser’s response to the environmental loading and determination of the mechanical loads acting upon and developed within the riser require specialized computer modeling and analysis. The general procedure used to xpi riser system design loads and responses is described in API Recommended Practice 16Q.
Additional sources of applied load that are not included in the rated load may signi? These data are to be based on design load de? This support constrains the lines to approximate the curvature of the riser pipe.
Loads can be induced on the coupling from pressure in the lines, imposed de? The manufacturer shall document those loads induced by choke, kill, 16 auxiliary lines for which the coupling has been designed.
The manufacturer shall document the buoyancy thrust loads for which the coupling has been designed. The manufacturer shall document the riser handling loads for which the coupling is designed and how these loads are applied. The coupling design load shall be applied to verify any assumption made in the analysis regarding separation. Strain gauges shall be placed as near as physically possible to at least?
Rosettes shall be used. All strain gauge readings and the associated loading conditions shall be recorded in a manner that they may be retained as part of the coupling design documentation. It is often dif? High stress areas may be inaccessible and are sometimes so small that a xpi gauge gives an average rather than the peak value.
The testing should serve to verify the pattern of strain in regions surrounding the critical points. The manufacturer shall establish the design load for each coupling design based on the methods and criteria given in this speci? Neither calculated nor measured stresses in a coupling shall exceed the allowable stress limits of the coupling material when subjected to the design load. For simplicity, the design loading condition is taken to be axisymmetric tension.
In using this simpli? The coupling design load can be speci? This information shall be acquired by? The analysis must provide accurate or conservative peak stresses, and shall include any deleterious effects of spfc of preload from wear, friction, and manufacturing tolerances. Suggestions for the analysis can be found in Appendix A. The following shall be documented and included in the analysis: Hardware and software used to perform the analysis.
The testing has two primary objectives: Strain gauge data shall be used to measure preload stresses as they relate to make-up load or displacement. Aapi this relationship, the calculated riser pipe stress at the middle of the pipe wall caused by pure bending is treated the same as that caused by pure tension.
API Spec 16R (R2010)
Auxiliary loads as de? For load-carrying bolts in bolted-? Acceptance criteria for these bolt stresses shall be based on recognized codes and standards. Identify sppec stress points speec the structure and the pipe-tocoupling weld. For each, record the local peak stresses L1 through L8 using von Mises theory, explained in more detail in Appendix C for loading conditions L1 through L8.
Calculate the SAFs for the pin and for the box of the coupling. If SAF varies with load or preload, document this variation. Design loads tensile, bending, loads from auxiliary lines, and others as de?
Finite Element Analysis performed in accordance with 4.