7/21/2019 Wrc 329-1987 Accuracy of Stress Intensification Factors for Branch Connections_part4 http://slidepdf.com/reader/full/wrc-329-1987-accuracy-of-stress-intensification-factors-for-branch-connectionspart4 1/11 Section 4.~).:3 presents evidence that K 2 b is likely to be around 2.0, not LO. On the other hand, the calculated stresses are based on intersecting shells with no fillet weld or radius. These stresses attenuate very rapidly, sometimes by 50% within one wall thickness. In fatigue test models, the fillet weld or outer fillet radius may cover this high stressed area, and thereby significantly reduce the actual stresses as compared with the calcu lated stresses. Further, the fillet weld or outer radius may provide reinforcement in the critical intersection zone. In the sense that protection against fatigue is the rationale behind the Code evaluations using i-factors, we view the fatigue tests as more directly relevant than calculated stresses. We thus view Table 15 compari sons as an adequate basis for the proposed i for RIT up to about 25. (Note that the maximum R/T in Table 14 is 18.2.) Based on all present evidence, we think it is reasonably valid for R/T up to 50. As a final point, note that i covers the full range of r/R; hence, the UFT can be deleted from Fig. NC- 3673.2(b)-1. Indeed, if it is not deleted, the underesti mate of i for Mob would remain in the Code. 6.0 References 1. Mark , A. R. C. and George, H. H., "Fatigue Tests on Flanged Assemb· Trans ASME, 82,77-87, (19 )0). Mark , A. R. C. "Fatigue Tests of Piping Components," Trans. ASME, 74,287-303, (1952). 3. ANSI B3Ll, "Power Piping," 1983 Edition, ASME, New York. 4. ANSI B31.3, "Chemical Plant and Petroleum Refinery Piping," 1983 Edition, ASME, New York. 5. ASME Boiler and Pressure Vessel Code, Section Ill. Division l. "Nucle ar Power Plant Components," 1983 Ed. with Winter 1984 Addenda, New York, NY 10017. 6. Blair, J. S., "Heinforcment of Branch Pieces," Engineering, London, England, 1947. 7. Pickett, A. G., et al., "Low Cycle Fatigue Testing of One-Half Scale Model Pressure Vessels," Progress Reports No. 9-12. Southwest Research Institute, San Antonio, Texas, July 1964-.Jan. 1965. 8. Decock, J., "External Loadings on Nozzles in Cylindrical Shells.'' 4th lnt'L Conf. on Press. Vessel Technology, J. Mech. Eng., 1980. 9. Davies, J. B. and Jaske. C. E. "Fatigue Evaluation of Weldolet Branch Connections in Carbon Steel Pipe," Battelle-Columbus Report to Bonney Forge, Allentown, PA 18105, Aug. 30, 1974. 10. Tableriou, J.P. and Walsh, D ., "Determination of Stress Intensifica tion Factors for the Code Qualification of Integrally Reinforced Branch Con nections," ASME Paper No. 78-PVP-66 and "Final Report on 1979 S F Testing Program.'' Target Technology Report to WFL Inc., Houston, Texas 77008, Aug. 22, 1979. 11. Forte, T. P., "Fatigue Evaluation of 6 x 4 Weldolet Branch Connections in Carbon Steel Pipe," Battelle-Columbus Report to Bonney Forge, Allen town, PA 18105, Dec. 31, 1981. 12. Davies, K. B. and Jaske, C. E., "Fatigue Evaluation of 12 x 6 Weldolet Branch Connections in Carbon Steel Pipe," Battelle-Columbus Report to Bonney Forge, Allentown, PA 18105, June 25, 1975. 13. Forte, T. and .Jaske, C. E. "Fatigue Evaluation of 14 x 6lnsert Weldolet Branch Connections in Carbon Steel Pipe," Battelle-Columbus Report to Bonney Forge, Allentown, PA 18105, Apr. 30, 1981. 14. Rodabaugh, E. C., "Cycl ic B<?nding Tests of a Half-Scale Model of an 8" x 24" Saddle Reinforced Branch Connection,'' Tube Turns, Report No. 8.011, Louisville, K Y 40201, 1953. 15. Mershon, J. L., Letter to member of PVRC Subcommittee on Rein forced Openings, Dec. 20, 1963. 16. Schneider, R. W., Letters to C. R. Felmley, .Jr., Executive Secretary of PVRC, Mar. 17, 1981, Mar. 31, 1981 and Apr. 10, 1981. 17. Schneider, R. W., Letter to ,J. Millman, Secretary of ASME Section III, Apr. 21, 1981 (copy to B31 Code Committee on Pressure Piping). 18. Khan, A. S., "A Study of Fatigue Crack Initiation and Failure in Rein forced Shell to Shell Intersections," U. of Oklahoma, Report Prepared for WFI International, Houston, TX, May 1985. 19. Lankston, R. J. (Taylor Forge Engineered Systems, Inc., Paoli, KS 6(l071) Letter to E. C. Rodabaugh dated May 30, 1985. 20. Mershon, .J. L., et al., "Local Stresses in Cylindrical Shells Due to External Loadings on Nozzles-Supplement to WR Bulletin No. 107, WRC Bulletin 297, New York, Aug. 1984. 21. Fujimoto, T. and Soh, T., "Flexibility Factors and Stress Indices for Piping Components with D T > 100 Subjected to In-Plane or Out-of-Plane Moment," pp. 59-70 of ASME Bound Volume No.HOO:J29 of Pressure Vessels and Piping Conference, New Orleans, .June 1985. 22. Wordsworth, A. C. and Smedley, G. P., "Stress Concentrations of lin stiffened Tubular Joints," European Offshore Steels Research Seminar, Cam bridge, 1978. 2:l. Moffat, D. G., "ExpNimental StrP" Analysis of J FabricatPd Equal Diamc·ter Branch Pipe Intersections Suhj('('t('(l to Moment Loadings," 'roc. lnst. Mech. Eng . Part A.lsstt<: A4. 24. Wkhman, K. R. HoppN. A. and Me"hon . . L., "Local Spherical and Cylindrical Shell> Due to External Loadings," WRC /07 NPw York. Aug. 19hfl, ""'ised Marrh 1979. 2f>. Corum,.). M . et a/ "TheorPtiral and Experim<•ntal Analysis of OHNL Thin-Shell Cylinder to-Cylinder-Model No. 1 2, :l, ·ll. OHNL-TM 4:,5:l, fJ021, G020 and f>OJ9 for ModPls I, 2, : and 4, respectively. Dated Oct. 1972, Oct. 197fJ, ,Jltne 1975 and ,June 197;, for Models I, 2, :land 4, respectively, Oak Ridge National Laboratory, Oak Hidge. TN :mno. 26. Hodahaugh, E. C. and Moore, S. E., "Stress Indices and Flexibility Factors for Nozzles in Pressure Vesspls and Piping," NUREG/l'H-0778, Oak Hidge National Laboratory, .June 1979. 27. Rodabaugh, E. C., "Compari,ons of ASME Code a t i ~ u e Evaluation Method for Nuclear Cla8s 1 Piping with Class 2 or 3 Piping," Nl1HEG/CR :)24:l. Oak Hidge National Laboratory, .June 1983. 28. Rodabaugh, E. C., "Sources of Uncertainty in the Calculation of Loads on Supports on Piping Systems," NUREG/CH-3599, Oak Hidge National Laboratory, .June 1984. Appendix A-Specific Recommendations for NC- 3600 of ASME Code Section III The last pages of this Appendix include copies of pages 166, 171, 172, 173 and 17 4 from NC-3600 of the ASME Code, Section III, 1986 Edition. Pages 166, 171, 172 and 174 are marked-up to show recommended changes. Table A1 contains the recommended notes to replace those on p. 173. The changes include those in Section 5 of this re- port. We will discuss those first in the following. In addition, several more-or-less editorial changes tooth er portions of Code pages 171, 172 and 173 are suggest ed; we discuss those subsequently in the following. To facilitate the discussion of changes, we have numbered the "Descriptions" from (1) to (15) as noted on the left margin of Code pages 171 and 172. Changes From Recommendations in Section 5 of This Report Page 166 This change reflects Recommendation IOc). This change makes the procedure the same for Descriptions (4), 5) and (7); and eliminates the t~/Tr) term in the i-equation for checking the branch end of Description (7). We have changed Tb t o ~ as being consistent with page 174. We have not changed Tr; it agrees with page 174 but not page 171. Description (4), Welding tee per ANSI Bl6.9 The only change is replacing the meaningless" 1" by "Note (9) ; see Recommendation 1). Description (5), Reinforced fabricated tee The "Description" has been retitled to "Fabricated branch connection " rather than "tee." This is mo- tivated by revised footnote (7), which is applicable to "Fabricated branch connections "; Descriptions 5) and 7) not "Welding tee "Description (4). The "1" has been changed to "Note (9)." It might be noted that the run moment problem continues to exist for Description (5). For example, consider a 24 in. diam x 0.375 in. wall run pipe with 4.5 in. diam x 0.237 in. wall branch. For a pad or saddle with te = 0.375 in., the SIF i = 4.57. Using Description (7), which, of course, is without a pad, i = 2.1 (lower bound, r2 not provided). Perhaps the Mob problem also exists. 36 WRC Bulletin 329
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7/21/2019 Wrc 329-1987 Accuracy of Stress Intensification Factors for Branch Connections_part4
295 Fundamentals of Weld Discontinuiti es and Their Significance, by C. D. Lundin, June 1984.
296 Fitness-for-Service
Criteria for
Pipeline Girth-Weld Quality, by R P. Reed,
M. B
Kasen,
H.
I, McHenry, C. M. Fortunko. and
D.
T.
Read,
July 1984.
297 local Stresses In Cylindrical Shells Due to External loadings on Nozzles-Supplement to WRC Bulletin No. 107, by J. L Mershon, K Mokhtarian, G. V. Ran-
jan, and E. C. Rodabaugh, August 1984.
298 long-Range Plan
lor
Pressure-Vessel
Research-Seventh
Edition, by the Pressure Vessel Research Committee, September 1984.
299
1) Engineering Aspects of CTOD
Fracture
Toughness Testing, by G.
W.
Wellman and
S.
T. Rolfe; 2) Three Dimensional Elastlc·Plastlc Fi nite Element
Analysis of Three-Point Bend Specimen, G. W. Wellman. S. T. Rolfe and R. H. Dodds; and
3)
Failure Prediction of Notched Pressure Vessels Using the
CTOD Approach, by
G.
W. Wellman, S.
T.
Rolfe and R. H. Dodds, November 1984.
300
(
1)
Technical Position
on
Criteria
Establishment;
2)
Technical Position on Damping Values for Piping-Interim Summa ry Report;
3)
Technical Position on
Response Spectra Broadening;
4)
Technical Position on Industry Practl<:4, December 1984.
301 A
Parametric
Three-Dimensional
Finite Element
Study of
45
Degree
Lateral
Connections, by P. P. Raju, January 1985.
302
1)
Postweld HeatTreatment
of Pressure Vessels, by
R. D
Stout; 2) Relaxation Stresses In Pressure Vessels, by P. S. Chen, W. A. Herman, and A. W. Pense;
3) A Study of Residual Stress In Pressure Vessel Steels, by R J. Zhou, A. W. Pense, M. L Basehore. and D
H.
Lyons, February 1985.
303
Interpretive
Report on
Dynamic
Analysis of Pressure Components-Third Edition-April 1985.
304 Experimental Limit Couples for Branch Moment loads on 4-ln. ANSI B16.9
Tees
by J Schroeder, May 1985.
305
Summary Reports Prepared by the JPVRC Subcommit tee
on
Hydrogen Embrlttlement: 1) Hydrogen Attack Limit of 2'/. Cr-1 Mo Steel by Task Group I; 2)
Embrittlement of Pressure Vessel Steels in High Temperature, High Pressure Hydrogen Environment by Task Group II;
3)
Hydrogen Embrlttleme nt of
Bond
Structure
Between Stainless Steel Overlay and
Base
Metal by Task Group Ill, June 1985
306
PVRC Flanged Joint User Experience Survey by J.
R
Payne, July 1985
307 Fatigue and Creep Rupture
Damage
of Perforated Plates Subjected
toCyllc
Plastic Straining In Creep Regime, by M.L Badlanl, T. Tanaka, J S. Porowskl and
W. J. O'Donnell, August 1985
308 Verification and Application of an Inelastic Analysis Method for lMFBR Piping Systems, by H. D. Hibbitt and E. K Teung, September 1985
309
Development
of
a Production Test Procedure
for
Gaskets,
by
A. Bazergui,
L
Marchand, and
H.
D. Raut, November 1985
310 Damage Studie s in Pressure Vessel Components, by
F
A. Leckie, December 1985
311 Assessment of the Slgnlflcance of
Weld
Dlscontlnutles: Effects of Microstruc ture and Discontinuities upon Fracture Morphology, by
C.
0. Lundin and C.
R.
Patriarca, January 1986.
312
Joining of Molybdenum Base
Metals
and Factors Which Influence Ductility,
by
A. J. Bryhan, February 1986
313
Computer
Programs
for
Sensitivity Analysis of Stiffened Cylindrical Shells, y R L Clterley, April 1986.
314
Bolted
Flanged Connections
with Full
Face Gaskets, by A. E. Blach,
A.
Bazergul, and R. Baldur, May 1986.
315 Stress Rupture Behavior of Postweld Heat Treated 2-'\'
4
Cr-1Mo Steel Weld Metal, by C. D. Lundin, S.C. Kelley, R. Menon, and B. J Kruse, June 1986
316
1)
Technical
Position
on
Piping
System
nstallation Tolerances,
byE.
B. Branch, N. Kalyanam, D. E Landers, E
0.
Swain, andD A. VanDuyne;
2)
Technical
Posttlon
on
Damping Values tor Insulated Pipe-Summary Report, by J 1 Bitner, S. N. Hou, W. J. Kagay, and J. A. O'Brien, July 1986.
317 PVRC Ce ntrifugal Pump..Piplng Interaction Experlen<:4Survey, by J.
R
Payne, August 1986.
318 ( 1) Factors Influencing
the
.Measurement
of
Ferrite Content In .AustenltlcStalnless.Steel Weld Metal using Magneti c Instruments, by E. W. Pickering,
E
S
Robitz, and D. M. Vancter:griff;(2) Measurement
of
FerriteContentln.Austenlllc Stainless Steel Weld
Metal
Giving Internationally Reproducible Results, by
E
Stalmasek, September 19 86.
319 .Sensltlzation·1lf Austenitic Stainless
Steels;
Effect1>f Welding Variables on
HAZ
Senslllzatlon of AlSI304
and
HAZ Behaviorof BWR Alternative
Alloys 316
NG and 347,
by
C. D. Luctin,
C.
H.
Lee,
A.
Menon, and
E
E. Stansbury, November 1986.
320 Welding Metallurgy and
Weldabllity
of High Stren.Qth Aluminum A lloys , by S. Kou December 1986.
321 The Dynamic Deformation of Plplng, by J L. Mclean,P K. Beazley and A. H. Manhardt, January 1987.
322
1) The Strain
Aging Behavior of
Microalloyed
Steels,by W.
A.
Herman, M.A.Erazo, L R Depatto, M. Sekizawaand A.W. Pense; 2) The
Fracture
Toughness
Behavior
of
ASTM A737 Grade
Band
Grade CMicroalloyed PresSure Vesse l Steels, by J. A. Aadland, J.
l.
Qureshi and A. W. Pense;
3)
The Fracture Be
havior of ASTM
A737
Grade Band Grade CMicroalloyed Steel Weldments, by J M. Aurrecoechea,
B.
Oain and A. W.Pense; {4) Long
Time
Stress Relief
Effects In ASTM A737 Grade Band Grade CMicroalloyedSteels, b yN. Shinohe, M.
SeklzawaandA.
W. Pense,
April1987.
323
Monograph on
Narrow-Gap
Welding
Technology, by V, Malin, May 1987.
324
Investigation
of
Design
Crlleria for Dynamic Loads
on
Nuclear Power
Piping,
by
R. J. Scavuzzo and P.
C.
Lam, June 1987
325 Further Gasket
Leakage
Behavior
Trends, by A. Bazergui, L Marchand andH
0.
Raut, July 1987.
326
Revised Bulletin 191-August 1987. Suggested Arc-Welding Procedures for Steels Meeting Standard Specifications, by C.
W.
Ott and D. J. Snyder. This
Revision is a part onne WAC book, Weldability
of
Steels-Fourth Edition.
Revised
Bulletin 297. Local Stre.ss'es
ln
Cylindrical ShellsDue
to
ExternalLoadings on Nozzles-Supplement
to
WRC Bullet in 107 (Revision
1 , by
J L. Mershon, K
Mol<htarian, G. V. Ranjonand E. C. Rodabaugh, September 1987.
327
Long,Range Plan for Pressure-Vessel Research-Eighth Edition, by the Pressure Vessel Research Committee , October 1987.
328
1)
SpeCimen ThicknessEffects for l a s t i c P i a s t i ~ C T O D Toughness ofanA36 Steel, by G. W. Wellman,
W.
A. Sorem,
R
H. Dodds, Jr., and S. T. Rol fe; 2) An
Analytical and Experimental Comparison
of
Rectangular and Square CTOD Fracture Specime ns of an A36 Steel,