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Supplement 1 April 1999 EFFECTIVE DATE APRIL 15,1999 Bulletin on Formulas and Calculations for Casing, Tubing, Drill Pipe, and Line Pipe Properties API BULLETIN 5C3 SIXTH EDITION, OCTOBER 1, 1994 American Petroleum Institute Helping You Get The Job Done Right.““ Supplement 1 to Formulas and Calculations for Casing, Tubing, Drill Pipe, and Line Pipe Properties Throughout document, delete C-75 and P-105, they are no longer API grades. Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Change 0.5666 to 0.5672 in equations 68 and 71. Change 0.5666 to 0.5672 in equation 78 Change 0.2833 to 0.2836 in equation 84 Change 0.2833 to 0.2836 in equations 89 and 96 Change 0.2833 to 0.2836 in equation 103 Change 0.2833 to 0.2836 in equations 108 and 113 Change 0.2833 to 0.2836 in equations 123 and 132 Page 39, delete Section 11, Metrication does not reflect current practice. 1 3M4I99 Additional copies available from API Publications and Distribution Information about API Publications, Programs and Services is available on the World Wide Web at http//www.api.org 202 682-8375 American 1220 L Street, Northwest Petroleum Washington, D.C. 20005-4070 Institute 202-682-8000 Order No. G5C3S1 API BULL*SC3 94 0732290 0538872 T3T Bulletin on Formulas and Calculations for Casing, Tubing, Drill Pipe, and Line Pipe Properties API BULLETIN 5C3 SIXTH EDITION, OCTOBER 1, 1994 Petroleum and natural gas industries-Formulae and calculations for casing, tubing, dritt pipe, and line pipe properties American Petroleum Institute 1220 L Street, Northwest 11 Washington, D.C. 20005 API BULL*SC3 94 0732290 0538873 976 Bulletin on Formulas and Calculations for Casing, Tubing, Drill Pipe, and Line Pipe Properties Exploration and Production Department API BULLETIN 5C3 SIXTH EDITION, OCTOBER 1, 1994 American Petroleum Institute API BULL*5C3 94 0732290 0538874 802 SPECIAL NOTES Note This section IS not part of IS0 10400 1993. API publications necessarily address problems of a general nature. With respect to par- ticular circumstances, local, state, and federal laws and regulations should be reviewed. APT 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 manufac- turer 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, or product covered by letters patent. Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent. Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. 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 five years after its publication date as an operative APT standard or, where an extension has been granted, upon republi- cation. Status of the publication can be ascertained from the API Authoring Department [telephone 214 953-1101]. A catalog of API publications and materials is published an- nually and updated quarterly by API, 1220 L Street, N.W., Washington, D.C. 20005. This document was produced under API standardization procedures that ensure appro- priate notification and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this standard or comments and questions concerning the procedures under which this standard was devel- oped should be directed in writing to the director of the Exploration and Production De- partment, American Petroleum Institute, 700 North Pearl, Suite 1840, Dallas, Texas 75201. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director. API publications may be used by anyone desiring to do so. 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 representation, warranty, or guarantee in connection with this pub- lication 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 conflict. API standards are published to facilitate the broad availability of proven, sound engineer- ing and operating practices. These standards are not intended to obviate the need for apply- ing sound engineering judgment regarding when and where these standards should be utilized. The formulation and publication of MI standards is not intended in any way to inhibit any- one from using any other practices. Any manufacturer marking equipment or materials in conformance with the marking requirements of an APT standard is solely responsible for complying with all the applica- ble requirements of that standard. API does not represent, warrant, or guarantee that such products do in fact conform to the applicable API standard. Copyright O 1994 American Petroleum Institute API BULLa5C3 74 O732290 0538875 747 lil CONTENTS FOREWORD . vii 1 SCOPE 1 2 COLLAPSE PRESSURE 1 2.1 Collapse Pressure Formulas . 1 2.2 2.4 Derivation of Collapse Pressure Formulas Application of Collapse Pressure Formulas to Line Pi 3 PIPE BODY YIELD STRENGTH 2.3 Collapse Testing Procedure . 11 3.1 3.2 Pipe Body Yield Strength . Application of Pipe Body Yield Strength Formula to 4 INTERNAL PRESSURE RESISTANCE . 4.1 Internal Yield Pressure 14 4.3 4.2 Internal Pressure Leak Res nce at E, or E, Plane 15 Application of Internal Pressure Resistance Formulas to Line Pipe 16 5 JOINT STRENGTH 5.1 Round Thread Casing Joint Strength . 5.2 Buttress Thread Casing Joint Strength . 5.3 Extreme-Line Casing 5.4 Tubing Joint Strength 5.5 Joint Strength of Rou Bending and Internal Pressure 5.6 Line Pipe Joint Strength . 6 WEIGHTS . 6.1 Nominal Weight 6.3 Calculated Threaded and Coupled Weight . 6.4 Calculated Upset and Threaded Weight for Integral Joint Tubing and Extreme-Line Casing 6.6 Weight Gain Due to End Finishing 6.7 Calculated Coupling Weight . 6.8 Calculated Weight Re 6.9 Calculated Weight of 6.10 Calculated Weight of 6.11 Calculated Weight of Externa 6.12 Calculated Weight of Extreme-Line Upsets 6.2 Calculated Plain-End Weight . 22 6.5 Calculated Upset Weight . 7 ELONGATION . 8 FLATTENING TESTS . 33 8.1 Flattening Tests for Casing an . 8.2 Flattening Tests for Line Pip 9 HYDROSTATIC TEST PRESSURES Hydrostatic Test Pressures for Plain-End Pipe, Extreme-Line Casing, and Integral-Joint Tubing 33 36 9.1 9.2 Hydrostatic Test Pressure for Threaded and Coupled Pipe 34 10 MAKEUP TORQUE FOR ROUND THREAD CASING AND TUBING API BULLW5C3 94 O732290 0538876 b85 E 11 GUIDED BEND TESTS FOR SUBMERGED ARC WELDED LINE PIPE 37 12 DETERMINATION OF MINIMUM IMPACT SPECIMEN SIZE FOR API COUPLINGS AND PIPE 38 12.1 Critical Thickness . 38 12.2 Calculated Coupling Blank Thickness 12.3 Calculated Wall Thickness for Transverse Specimens 38 12.4 Calculated Wall Thickness for Longitu 12.5 Minimum Specimen Size for API Coup 12.6 Impact Specimen Size for Pipe . 40 12.7 Larger Size Specimens 40 12.8 Reference Information . . 40 13 METRICATION . . 44 13.1 Metric Conversions and Calculations 44 13.2 Rounding of Metric Units 44 14 CALCULATION ACCURACY AND ROUNDING 45 14.1 Accuracy 45 14.2 Intermediate Rounding . 45 14.3 Final Rounding . 45 Figures 1-Grade N-80 Transition Collapse Formula Derivation 10 2-Ovality Gauge . 13 3-Coupled Pipe 22 4-Upset Pipe 23 5-Upset Pipe-Both Ends for example The Special Notes and Foreword are not part of IS0 10400 1993. Section 12 is not part of IS0 104001993. Language that is unique to the IS0 version is shown in bold oblique type in the text or, where extensive, is identified by a note under the title of the section. Language that is unique to the API version is identified by a note under the title of the section or is shaded. The bar notations identify parts of this publication that have been changed from the previ- ous API edition. This standard is under the jurisdiction of the Committee on Standardization of Tubular Goods. This standard shall become effective on the date printed on the cover but may be used voluntarily from the date of distribution. API BULL*rSC3 94 0732290 0538879 394 Bulletin on Formulas and Calculations for Casing, Tubing, Drill Pipe, and Line Pipe Properties 1 Scope The purpose of this bulletin is to show the formulas used in the calculation of the vari- ous pipe properties given in API standards, including background information regarding their development and use. This bulletin is under the jurisdiction of the Committee on Stan- dardization of Tubular Goods. 2 Collapse Pressure 2.1 COLLAPSE PRESSURE FORMULAS The minimum collapse pressures given in API Bulletin 5C2 are calculated by means of Formulas 1, 3, 5, and 7, adopted at the 1968 Standardization Conference and reported in API Circular PS-1360 dated September 1968. Formulas 2, 4, and 6 for the intersections between the four collapse pressure formulas have been determined algebraically and used for calculating the applicable D/t range for each collapse pressure formula. Factors A, B, C, F, and G have been calculated using For- mulas 21,22,23,26, and 27. When determining the appropriate formula to be used for cal- culating collapse resistance for a particular D/t ratio and minimum yield strength, the D/t ranges determined by Formulas 2, 4, and 6 govern, rather than the collapse formula that gives the lowest collapse pressure. The D/t ranges are given in Tables 1,2,3, and 4. The collapse pressures for API Bulletin 5C2 are calculated using the specified values for D and t, rounding D/t to two decimals carrying eight digits in all intermediate calcula- tions and rounding the collapse pressure to the nearest 10 pounds per square inch. Theoretical studies of the effect of ovality on tubular collapse resistance consistently in- dicate that an ovality of 1 to 2 percent can effect a reduction in collapse resistance on the order of 25 percent. However, experimental/empincal investigations indicate a much smaller effect. Test data indicate that ovdity is oniy one of many pipe parameters that in- fiuence collapse including residual stress, isotropy, shape of stress-strain curve/mi- crostructure, and yield strength. Thorough review of industry collapse data indicates that the influence of ovality does not warrant singling out the ovality as a dominant parameter. A work group on coliapse resistance concluded the effect of ovality on tubular collapse has been handled during the adjustment of average collapse predictions to minimum perfor- mance values and that ovality should not be awarded the status of an independent variable in an API formula for collapse performance. 2.1.1 Yield Strength Collapse Pressure Formula The yield strength collapse pressure is not a true collapse pressure, but rather the exter- nal pressure, P, that generates minimum yield stress, Yp, on the inside wall of a tube as calculated by Formula 1. P’ r Formula 1 for yield strength collapse pressure is applicable for D/t values up to the value of D/t corresponding to the intersection with the plastic collapse Formula 3. This intersec- tion is calculated by Formula 2 as follows 1 API BULL*5C3 94 0732290 0538880 006 m dA-2*8BC/YpA-2 W, 2B CIY,, The applicable D/t ratios for yield strength collapse are shown in Table 1 2.1.2 Plastic Collapse Pressure Formula The minimum collapse pressure for the plastic range of collapse is calculated by For- mula 3 P Y --B -C i“ Dlt 1 3 The formula for minimum plastic collapse pressure is applicable for D/r values ranging from Formula 2 for yield point collapse pressure, to the intersection with the For- mula 5 for transition collapse pressure D/tPT. Values for D/QPT are calculated by means of Formula 4 The factors and applicable D/r range for the plastic collapse formula are shown in Table 2. 2.1.3 Transition Collapse Pressure Formula The minimum collapse pressure for the plastic to elastic transition zone P, is calculated by Formula 5 Table 1 -Yield Collapse Pressure Formula Range H-40 -50 J-K-55 -60 -70 C-E-75 L-N-80 C-90 C-T-X-95 -100 P-G-105 P-110 -120 Q-125 -130 S-135 -140 -150 -155 -160 -170 -180 16.40 and less 15.24 and less 14.81 and less 14.44 and less 13.85 and less 13.60 and less 13.38 and less 13.01 and less 12.85 and less 12.70 and less 12.57 and less 12.44 and less 12.21 and less 12.1 1 and less 12.02 and less 11.92 and less 11 34 and less 11.67 and less 11.59 and less 11.52 and less 11.37 and less 11.23 and less aGrades indicated without letter designation are not API grades but are grades in use or grades being considered for use and are shown for information purposes. bThe D/t range values were calculated from Formulas 2,21, 22, and 23 to eight or more digits.
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