1、Juli 2005DEUTSCHE NORM Normenausschuss Erdl- und Erdgasgewinnung (NG) im DINPreisgruppe 14DIN Deutsches Institut fr Normung e.V. Jede Art der Vervielfltigung, auch auszugsweise, nur mit Genehmigung des DIN Deutsches Institut fr Normung e. V., Berlin, gestattet.ICS 75.180.10G4G15G45G62G105G59395698ww
2、w.din.deG88DIN EN ISO 13625Erdl- und Erdgasindustrie Bohr- und Frderausrstungen Kupplungen fr Bohrfrderleitungen auf See (ISO 13625:2002);Englische Fassung EN ISO 13625:2002Petroleum and natural gas industries Drilling and production equipment Marine drilling riser couplings (ISO 13625:2002);English
3、 version EN ISO 13625:2002Industries du ptrole et du gaz naturel Equipement de forage et de production Connecteurs de tubes prolongateurs pour forages en mer (ISO 13625:2002);Version anglaise EN ISO 13625:2002Alleinverkauf der Normen durch Beuth Verlag GmbH, 10772 Berlinwww.beuth.deGesamtumfang 31 S
4、eitenB55EB1B3E14C22109E918E8EA43EDB30F09CC9B7EF8DD9NormCD - Stand 2007-03 ,1(1,6221DWLRQDOHV9RUZRUWLHVH (XURSlLVFKH 1RUP ZXUGH YRP 7HFKQLVFKHQ .RPLWHH this is accomplished by elastic deformation induced during make-up of the coupling 3.1.12 rated load nominal applied loading condition used during co
5、upling design, analysis and testing, based on a maximum anticipated service loading NOTE Under the rated working load, no average section stress in the riser coupling exceeds allowable limits established in this International Standard. 3.1.13 riser coupling box female coupling member 3.1.14 riser jo
6、int section of riser pipe having ends fitted with a box and a pin, typically including integral choke and kill and auxiliary lines 3.1.15 riser main tube basic pipe from which riser joints are fabricated 3.1.16 riser coupling pin male coupling member 3.1.17 stress amplification factor SAF KSAFfactor
7、 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 NOTE This factor is used to account for the increase in the stresses caused by geometric stress amplifiers which occur in riser com
8、ponents. 3.1.18 threaded coupling coupling having matching threaded members to form engagement EN ISO 13625:2002 (E) 7B55EB1B3E14C22109E918E8EA43EDB30F09CC9B7EF8DD9NormCD - Stand 2007-03 3.2 Abbreviations The following abbreviations are used in this International Standard. BOP Blowout preventer C b)
9、 4 450 kN (1 000 000 lbf); c) 5 560 kN (1 250 000 lbf); d) 6 670 kN (1 500 000 lbf); e) 8 900 kN (2 000 000 lbf); f) 11 120 kN (2 500 000 lbf); g) 13 350 kN (3 000 000 lbf); h) 15 570 kN (3 500 000 lbf). EN ISO 13625:2002 (E) 8B55EB1B3E14C22109E918E8EA43EDB30F09CC9B7EF8DD9NormCD - Stand 2007-03 4.1.
10、4 Stress amplification factor The calculated SAF values for the coupling shall be documented at the pipe-to-coupling weld and at the locations of highest stress in the pin and box. SAF is a function of pipe size, and wall thickness. It is calculated as follows: LPASAFNASKVV where VLPAis local peak a
11、lternating stress; VNASis nominal alternating stress in pipe. 4.1.5 Rated working pressure Riser couplings shall be designed to provide a pressure seal between joints. The manufacturer shall document the rated internal working pressure for the coupling design. 4.2 Riser loading 4.2.1 General A drill
12、ing risers ability to resist environmental loading depends primarily on tension. Environmental loading includes the hydrodynamic forces of current and waves and the motions induced by the floating vessels dynamic response to waves and wind. The determination of a risers response to the environmental
13、 loading and determination of the mechanical loads acting upon, and developed within, the riser require specialized computer modelling and analysis. (For the general procedure used to determine riser system design loads and responses, see API RP 16Q2. Additional sources of applied load that are not
14、included in the rated load may significantly affect the coupling design and shall be included in design calculations. 4.2.2 Loads induced by choke and kill and auxiliary lines Riser couplings typically provide support for choke and kill and auxiliary lines. This support constrains the lines to appro
15、ximate the curvature of the riser pipe. Loads can be induced on the coupling from pressure in the lines, imposed deflections on the lines and the weight of the lines. The manufacturer shall document those loads induced by choke and kill and auxiliary lines for which the coupling has been designed. 4
16、.2.3 Loads induced by buoyancy Riser couplings may provide support for buoyancy, which induces loads on the couplings. The manufacturer shall document the buoyancy thrust loads for which the coupling has been designed. 4.2.4 Loads induced during handling Temporary loads are induced by suspending the
17、 riser from the handling tool or spider or both. The manufacturer shall document the riser handling loads for which the coupling is designed and how these loads are applied. 4.3 Determination of stresses by analysis Design of riser couplings for static loading (see 4.6) and determination of the stre
18、ss amplification factors (see 4.7) require detailed knowledge of the stress distribution in the coupling. This information is acquired by finite element analysis and subsequently validated by prototype strain gauge testing. A finite element analysis of the EN ISO 13625:2002 (E) 9B55EB1B3E14C22109E91
19、8E8EA43EDB30F09CC9B7EF8DD9NormCD - Stand 2007-03 riser coupling shall be performed and documented. The analysis shall 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 ana
20、lysis can be found in Annex A. The following shall be documented and included in the analysis: a) hardware and software used to perform the analysis; b) grid size; c) applied loads; d) preload losses; e) material considerations. 4.4 Stress distribution verification test After completion of the desig
21、n studies, a prototype (or multiple prototypes) of the riser coupling shall be tested to verify the stress analysis. The testing has two primary objectives: to verify any assumptions which were made about preloading, separation behaviour and friction coefficients, and to substantiate the analytical
22、stress predictions. Strain gauge data shall be used to measure preload stresses as they relate to make-up load or displacement. Friction coefficients shall be varied (including at least two values) in order to establish sensitivity. The coupling design load shall be applied in order to verify any as
23、sumption made in the analysis regarding separation. Strain gauges shall be placed as near as physically possible to at least five of the most highly stressed regions, as predicted by the finite element analyses performed in accordance with 4.3, and in five locations away from stress concentrations.
24、Rosettes shall be used. All strain gauge readings and the associated loading conditions shall be recorded such that they may be retained as part of the coupling design documentation. Normal design qualification tests may be performed simultaneously with this stress distribution verification testing
25、(see 8.2). NOTE It is often difficult to acquire sufficient strain data to totally correlate with the analytical results. 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 serves to verify the pattern of stra
26、in in regions surrounding the critical points. 4.5 Coupling design load The coupling design load represents the maximum load-carrying capacity of the coupling. The manufacturer shall establish the design load for each coupling design, based on the methods and criteria given in this International Sta
27、ndard. Neither calculated nor measured stresses in a coupling shall exceed the allowable stress limits of the coupling material when subjected to the design load. The allowable material stresses are established in 4.6. The couplings rated load (see 4.1.3) shall be less than or equal to the couplings
28、 design load. For simplicity, the design loading condition is taken to be axisymmetric tension. In using this simplification, riser bending moment is converted to equivalent tension, TEQ. The coupling design load can be specified either as an axisymmetric tension of magnitude, Tdesign, or it may be
29、considered to be any combination of tension (T) and bending moment (M) so that 2oEQ design44oo32 ( )c(2)td tMTATM TTTIddt (2) EN ISO 13625:2002 (E) 10B55EB1B3E14C22109E918E8EA43EDB30F09CC9B7EF8DD9NormCD - Stand 2007-03 where c is the mean radius of riser pipe; I is the moment of inertia of riser pip
30、e; A is the cross-sectional area of riser pipe; dois the outside diameter of riser pipe; t is the wall thickness of riser pipe. Using this relationship, the maximum calculated riser pipe stress at the middle of the pipe wall caused by pure bending is treated in the same manner as that caused by pure
31、 tension. To classify a particular coupling design, only the axisymmetric tensile load (Tdesign) case need be considered. While the coupling design load provides a means of grouping coupling models regardless of manufacturer or method of make-up, it does not include all loads affecting coupling desi
32、gn. Additional loads (see 4.2) shall also be included in the evaluation of coupling designs. 4.6 Design for static loading 4.6.1 General The design of a riser coupling for static loading requires that it support the design load and preload, if any, while keeping the maximum cross-sectional stresses
33、within specified allowable limits. 4.6.2 Riser coupling stresses For all riser coupling components except bolts, stress levels shall be kept below the values provided in Annex C. For load-carrying bolts in bolted-flange couplings, the manufacturer shall document the design-allowable stress levels in
34、 the bolts. Acceptance criteria for these bolt stresses shall be based on recognized codes and standards. 4.7 Stress amplification factor Field experience suggests that the most likely cause of a riser coupling failure is propagation of a fatigue crack that has been initiated at a point of stress co
35、ncentration. It is, therefore, incumbent upon the designer to endeavour to minimize the conditions leading to the initiation and propagation of fatigue cracks. The SAF is intended to provide the coupling user with information needed to estimate fatigue damage for a particular application, without ex
36、tensive fatigue testing of the coupling. The SAF is a function of the double amplitude range of alternating stress. It is important to note that the SAF value depends largely on the exhaustiveness of the finite element analysis and the validity of assumptions in the analysis. Assumptions such as loa
37、d distribution, the correctness of preloading in field service and finite element size at critically stressed points necessitate individual evaluation for each design case. The following procedure shall be used for an individual coupling design: a) select the rated load from 4.1.3; b) perform finite
38、 element analysis in accordance with 4.3 to determine maximum equivalent combined stresses for the loads 1) L1= nominal preload plus 0,2 u rated load, 2) L2= nominal preload plus 0,4 u rated load, EN ISO 13625:2002 (E) 11B55EB1B3E14C22109E918E8EA43EDB30F09CC9B7EF8DD9NormCD - Stand 2007-03 3) L3= nom
39、inal preload plus 0,6 u rated load, 4) L4= nominal preload plus 0,8 u rated load, 5) L5= minimum preload plus 0,2 u rated load, 6) L6= minimum preload plus 0,4 u rated load, 7) L7= minimum preload plus 0,6 u rated load, and 8) L8= minimum preload plus 0,8 u rated load; c) verify the finite element a
40、nalysis by strain gauge test of prototype in accordance with 4.4; d) identify high-stress points in the structure and the pipetocoupling weld. For each, record the local peak stresses L1to L8(using von Mises theory, explained in more detail in Annex C) for loading conditions L1to L8; e) calculate th
41、e SAFs for the pin and for the box of the coupling. If SAF varies with load or preload, document this variation. 4.8 Design documentation For each size, model and service classification, the following documentation shall be retained by the manufacturer for a period of at least ten years after the ma
42、nufacture of the last unit of that size, model and service classification: a) design loads (tensile, bending, loads from auxiliary lines and others) in accordance with 4.2; b) finite element analysis performed in accordance with 4.3; c) results of tests performed in accordance with 4.4 and 8.2; d) r
43、esults of SAF and peak stress calculations in accordance with 4.7. 5 Material selection and welding 5.1 Material selection 5.1.1 General Material selection for each component of the riser coupling shall include consideration of the type of loading, the temperature range, the corrosive conditions, st
44、rength requirements, durability, toughness and the consequences of failure. Documentation of these design parameters shall be retained by the riser system manufacturer throughout the design life of the riser system. All materials used shall conform to a written specification covering chemical compos
45、ition, physical and mechanical properties, method and process of manufacture, heat treatment, weldability, and quality control. Such written specification may be either a published or manufacturers proprietary document. All materials for primary load-carrying components, including weld metals, shall
46、 be low alloy steels having properties as represented by test coupons conforming to the specifications of 5.1.5. Test coupons shall be cut from a separate or attached block, taken from the same heat and, when applicable, formed similarly and given the same heat treatment as the product material they represent. EN ISO 13625:2002 (E) 12B55EB1B3E14C22109E918E8EA
