Status: Alert Withdrawn.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 8th Ed With respect to particular circumstances, local, state, and federal laws and regulations should be reviewed. Apii is not undertaking to meet the duties of employers, manufacturers, or suppliers to warn and properly train and equip their employees, and others exposed, concerning health and safety risks and precautions, nor undertaking their obligations under local, state, or federal laws.
Information concerning safety and health risks and proper precautions with respect to particular materials and conditions should be obtained from the employer, the manufacturer or supplier of that material, or the material safety data sheet. Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, zpi product covered by letters patent.
Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent. Apec, API standards are reviewed and revised, reaf? Sometimes a one-time extension of up to two years will be added to this review cycle.
This publication will no longer be in effect? Status of the publication can be ascertained from the API Authoring Department [telephone ]. This document soec produced under API standardization procedures that ensure appropriate noti? Questions concerning the interpretation of the content of this standard or comments and questions concerning the procedures under which this standard was developed should be directed in writing to the director of the Authoring Department shown on the title page spdc this documentAmerican S;ec Institute, L Street, N.
Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director. API standards are published to facilitate the broad availability of proven, sound engineering and operating practices.
API Product Specification
These standards are not intended to obviate the need for applying sound engineering judgment regarding when and where these standards should be utilized. The formulation and publication of API standards is not intended in any way to inhibit anyone from using any other practices. Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for aapi with all the applicable requirements of that standard.
API does not represent, warrant, or guarantee that such products do in fact conform to the applicable API standard. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher.
Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no 166r, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal regulation with which this publication may con? 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? Materials and welding requirements are included in Section 5 and dimensions in Section 6. Section 7 covers quality control. Appendixes A, B, and C apii analysis, testing, and design, information. The coupling box or pin depending on design type provides a support to transmit the weight of the suspended riser string to spfc 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 joints to reduce their submerged weight. External conduits, arranged parallel to the main tube, used for circulation of? Choke and kill lines are primary pressure-containing members. A mechanical means for connecting 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.
API Product Specification
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 member.
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 wall 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 zpec. 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 as 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 spev.
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 61r engagement. Environmental loading includes the hydrodynamic forces of current and waves and the motions induced by 16 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 determine riser system design loads and responses is described in API Recommended Practice 16Q.
Additional sources a;i applied load that are not included in the rated load may spfc 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, and 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 16rr 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 strain gauge gives an average rather than the peak value.
The testing ai 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 a;i 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.
API Spec 16R (R)
For simplicity, the design loading condition is sec to be axisymmetric tension. In using this simpli? The coupling design qpi 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 loss 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 61r Strain gauge data shall be used to measure preload stresses as they relate to make-up load or displacement.
Using 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.
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 high stress points in the structure and the pipe-tocoupling weld.
For each, record the local peak stresses L1 through L8 apii 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.