1、AN AMERICAN NATIONAL STANDARD ASME B31G-2012(Revision of ASME B31G-2009)Manual for Determining the Remaining Strength of Corroded PipelinesSupplement to ASME B31 Code for Pressure PipingASME B31G-2012(Revision of ASME B31G-2009)Manual forDetermining theRemaining Strength ofCorroded PipelinesSuppleme
2、nt to ASME B31 Code forPressure PipingAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuance: October 24, 2012The next edition of this Manual is scheduled for publication in 2015.ASME issues written replies to inquiries concerning interpretations of technical aspects o
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11、n any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTE
12、NTSForeword ivCommittee Roster . vCorrespondence With the B31 Committee viSummary of Changes vii1 Introduction . 12 Evaluation Methods 63 Tables of Allowable Length of Corrosion . 8Figures1.12-1 Corrosion Pit Interaction Distances 51.13-1 Helically Oriented Corrosion Pattern 52.1-1 Corrosion Paramet
13、ers Used in Analysis 7Tables3-1 Values of L for Pipe Sizes NPS 2 and 20,SFp Sflow(1 d/t)Note that previous editions of B31G incorporated adefinition for flow stress of Sflowp 1.1 H11547 SMYS. Forconsistency in comparison to results obtained from eval-uations performed to an earlier edition, use of t
14、he samedefinition for flow stress is recommended.(12)ASME B31G-2012Fig. 2.1-1 Corrosion Parameters Used in AnalysisMeasured maximumdepth of corrosionMeasured longitudinal extent of the corroded area, LMLongitudinal axis of pipedReferences: ANSI/ASME B31G-1984 and ASMEB31G-1991.(b) Modified B31G. For
15、 z 50,M p (1 + 0.6275z 0.003375z2)1/2For z 50,M p 0.032z + 3.3SFp SflowH209001 0.85(d/t)1 0.85(d/t)/MH20901References: (1) Kiefner, J. F., and Vieth, P. H., “ProjectPR3-805: A Modified Criterion for Evaluating theRemaining Strength of Corroded Pipe,” AGA CatalogNo. L51609, Dec. 22, 1989; (2) Kiefner
16、, J. F., and Vieth,P. H., “New Method Corrects Criterion for EvaluatingCorroded Pipe,” Oil boundary conditions and con-straints; ovality, deformations, misalignments, and dis-continuities; material stressstrain characteristics; andeffects of the flaw on the overall distribution of loadsand stresses.
17、 A failure criterion should be developedthat considers the strain capacity or fracture resistancecharacteristics of the material. Similar issues should beconsidered in developing a suitable safety factor as weredescribed for a Level 1 or Level 2 analysis.3 TABLES OF ALLOWABLE LENGTH OF CORROSIONThe
18、following are applicable to Tables 3-1 through3-12M:(a) Metal loss having a maximum depth of 10% ofthe nominal pipe wall thickness or less is not limited asto allowable length.(b) Metal loss having a maximum depth exceeding80% of the nominal pipe wall thickness shall not beevaluated using the tables
19、 of allowable length.ASME B31G-2012Table 3-1 Values of L for Pipe Sizes NPS 2 and NPS 6Wall Thickness, t, in.Depth,d, in. 0.083 0.109 0.125 0.141 0.154 0.172 0.188 0.2180.01 1.99 No limit No limit No limit No limit No limit No limit No limit0.02 0.92 1.94 2.44 2.59 2.71 2.86 2.99 No limit0.03 0.53 0
20、.85 1.13 1.51 1.94 2.86 2.99 3.220.04 0.39 0.60 0.75 0.93 1.11 1.40 1.74 2.740.05 0.31 0.47 0.58 0.70 0.82 1.00 1.18 1.620.06 0.25 0.39 0.48 0.58 0.66 0.79 0.92 1.210.07 . . . 0.33 0.41 0.49 0.56 0.67 0.77 0.990.08 . . . 0.28 0.35 0.43 0.49 0.58 0.67 0.840.09 . . . . . . 0.31 0.38 0.43 0.51 0.59 0.7
21、40.10 . . . . . . 0.27 0.33 0.39 0.46 0.53 0.660.11 . . . . . . . . . 0.30 0.35 0.41 0.48 0.600.12 . . . . . . . . . . . . 0.31 0.38 0.43 0.550.13 . . . . . . . . . . . . . . . 0.34 0.40 0.500.14 . . . . . . . . . . . . . . . . . . 0.37 0.460.15 . . . . . . . . . . . . . . . . . . 0.34 0.430.16 . .
22、. . . . . . . . . . . . . . . . . . . 0.400.17 . . . . . . . . . . . . . . . . . . . . . 0.37Table 3-1M Values of L for Pipe Sizes 60 mm and 168 mm O.D.Wall Thickness, t,mmDepth,d, mm 2.1 2.8 3.2 3.6 3.9 4.4 4.8 5.50.3 50.5 No limit No limit No limit No limit No limit No limit No limit0.5 23.2 49.1
23、62.0 65.8 68.8 72.7 76.0 No limit0.8 13.4 21.7 28.7 38.3 49.2 72.7 76.0 81.91.0 9.8 15.1 19.0 23.7 28.1 35.6 44.2 69.51.3 7.8 11.9 14.7 17.9 20.8 25.3 29.9 41.11.5 6.4 9.8 12.1 14.6 16.8 20.1 23.4 30.71.8 . . . 8.3 10.3 12.4 14.3 17.0 19.5 25.02.0 . . . 7.2 9.0 10.8 12.4 14.7 16.9 21.42.3 . . . . .
24、. 7.9 9.5 11.0 13.0 14.9 18.82.5 . . . . . . 6.9 8.5 9.8 11.6 13.4 16.82.8 . . . . . . . . . 7.6 8.8 10.5 12.1 15.23.0 . . . . . . . . . . . . 8.0 9.6 11.0 13.93.3 . . . . . . . . . . . . . . . 8.7 10.1 12.83.6 . . . . . . . . . . . . . . . . . . 9.3 11.83.8 . . . . . . . . . . . . . . . . . . 8.5 1
25、0.94.1 . . . . . . . . . . . . . . . . . . . . . 10.24.3 . . . . . . . 9.59(12)(12)(12)ASME B31G-2012Table 3-2 Values of L for Pipe Sizes NPS 6 and NPS 10Wall Thickness, t, in.Depth,d, in. 0.083 0.125 0.156 0.188 0.203 0.219 0.250 0.3120.01 3.32 No limit No limit No limit No limit No limit No limit
26、No limit0.02 1.53 4.08 4.55 5.00 No limit No limit No limit No limit0.03 0.88 1.89 3.37 5.00 5.20 5.40 5.77 No limit0.04 0.65 1.25 1.90 2.91 3.61 4.65 5.77 6.440.05 0.51 0.97 1.40 1.97 2.30 2.73 3.86 6.440.06 0.42 0.80 1.13 1.54 1.77 2.04 2.67 4.770.07 . . . 0.68 0.96 1.29 1.46 1.66 2.11 3.370.08 .
27、. . 0.59 0.83 1.11 1.25 1.42 1.77 2.680.09 . . . 0.52 0.74 0.98 1.10 1.24 1.54 2.260.10 . . . 0.46 0.66 0.88 0.99 1.11 1.37 1.970.11 . . . . . . 0.59 0.80 0.90 1.01 1.24 1.760.12 . . . . . . 0.54 0.73 0.82 0.92 1.13 1.600.13 . . . . . . . . . 0.66 0.75 0.85 1.04 1.460.14 . . . . . . . . . 0.61 0.69
28、0.78 0.96 1.350.15 . . . . . . . . . 0.56 0.64 0.72 0.89 1.260.16 . . . . . . . . . . . . 0.59 0.67 0.83 1.180.17 . . . . . . . . . . . . . . . 0.63 0.78 1.100.18 . . . . . . . . . . . . . . . . . . 0.73 1.040.19 . . . . . . . . . . . . . . . . . . 0.69 0.980.20 . . . . . . . . . . . . . . . . . . 0
29、.65 0.930.21 . . . . . . . . . . . . . . . . . . . . . 0.880.22 . . . . . . . . . . . . . . . . . . . . . 0.840.23 . . . . . . . . . . . . . . . . . . . . . 0.800.24 . . . . . . . . . . . . . . . . . . . . . 0.7610ASME B31G-2012Table 3-2M Values of L for Pipe Sizes 168 mm and 273 mm O.D.Wall Thickne
30、ss, t,mmDepth,d, mm 2.1 3.2 4.0 4.8 5.2 5.6 6.4 7.90.3 84.4 No limit No limit No limit No limit No limit No limit No limit0.5 38.8 103.6 115.7 127.0 No limit No limit No limit No limit0.8 22.4 48.0 85.6 127.0 132.0 137.1 146.4 No limit1.0 16.4 31.8 48.1 73.8 91.6 118.1 146.4 163.61.3 13.0 24.6 35.5
31、50.0 58.5 69.3 98.0 163.61.5 10.7 20.3 28.7 39.1 44.9 51.7 67.8 121.11.8 . . . 17.3 24.3 32.6 37.1 42.2 53.6 85.52.0 . . . 15.0 21.1 28.2 31.9 36.0 45.0 68.12.3 . . . 13.1 18.7 24.9 28.1 31.6 39.1 57.42.5 . . . 11.6 16.7 22.3 25.1 28.3 34.8 50.22.8 . . . . . . 15.0 20.2 22.8 25.6 31.4 44.83.0 . . .
32、. . . 13.6 18.4 20.8 23.4 28.7 40.63.3 . . . . . . . . . 16.9 19.1 21.5 26.4 37.23.6 . . . . . . . . . 15.5 17.6 19.8 24.4 34.43.8 . . . . . . . . . 14.3 16.3 18.4 22.7 32.04.1 . . . . . . . . . . . . 15.1 17.1 21.2 29.94.3 . . . . . . . . . . . . . . . 15.9 19.8 28.04.6 . . . . . . . . . . . . . .
33、. . . . 18.6 26.44.8 . . . . . . . . . . . . . . . . . . 17.5 25.05.1 . . . . . . . . . . . . . . . . . . 16.4 23.65.3 . . . . . . . . . . . . . . . . . . . . . 22.45.6 . . . . . . . . . . . . . . . . . . . . . 21.35.8 . . . . . . . . . . . . . . . . . . . . . 20.26.1 . . . . . . . . . . . . . . . .
34、 . . . . . 19.211(12)ASME B31G-2012Table 3-3 Values of L for Pipe Sizes NPS 10 and NPS 16Wall Thickness, t, in.Depth,d, in. 0.156 0.219 0.250 0.307 0.344 0.365 0.438 0.5000.02 5.80 No limit No limit No limit No limit No limit No limit No limit0.03 4.29 6.87 7.34 No limit No limit No limit No limit N
35、o limit0.04 2.41 5.92 7.34 8.14 8.62 8.87 No limit No limit0.05 1.78 3.48 4.91 8.14 8.62 8.87 9.72 10.390.06 1.44 2.59 3.40 5.77 8.62 8.87 9.72 10.390.07 1.22 2.11 2.69 4.13 5.53 6.62 9.72 10.390.08 1.06 1.81 2.26 3.30 4.22 4.85 8.37 10.390.09 0.94 1.59 1.96 2.80 3.48 3.93 6.10 9.380.10 0.84 1.42 1.
36、74 2.45 2.99 3.35 4.92 6.950.11 0.75 1.28 1.57 2.19 2.65 2.94 4.18 5.640.12 0.68 1.17 1.44 1.98 2.39 2.64 3.67 4.810.13 . . . 1.08 1.32 1.82 2.18 2.40 3.29 4.230.14 . . . 1.00 1.22 1.68 2.01 2.21 2.99 3.800.15 . . . 0.92 1.14 1.56 1.86 2.05 2.75 3.460.16 . . . 0.86 1.06 1.46 1.74 1.91 2.55 3.190.17
37、. . . 0.80 0.99 1.37 1.64 1.79 2.39 2.970.18 . . . . . . 0.93 1.29 1.54 1.69 2.24 2.770.19 . . . . . . 0.88 1.22 1.46 1.60 2.12 2.610.20 . . . . . . 0.82 1.15 1.38 1.51 2.00 2.470.21 . . . . . . . . . 1.09 1.31 1.44 1.90 2.340.22 . . . . . . . . . 1.04 1.25 1.37 1.81 2.230.23 . . . . . . . . . 0.99
38、1.19 1.30 1.73 2.120.24 . . . . . . . . . 0.94 1.13 1.25 1.66 2.030.25 . . . . . . . . . . . . 1.08 1.19 1.59 1.950.26 . . . . . . . . . . . . 1.03 1.14 1.52 1.870.27 . . . . . . . . . . . . 0.99 1.09 1.46 1.800.28 . . . . . . . . . . . . . . . 1.05 1.41 1.730.29 . . . . . . . . . . . . . . . 1.00 1
39、.35 1.670.30 . . . . . . . . . . . . . . . . . . 1.31 1.610.31 . . . . . . . . . . . . . . . . . . 1.26 1.550.32 . . . . . . . . . . . . . . . . . . 1.21 1.500.33 . . . . . . . . . . . . . . . . . . 1.17 1.450.34 . . . . . . . . . . . . . . . . . . 1.13 1.410.35 . . . . . . . . . . . . . . . . . . 1
40、.09 1.360.36 . . . . . . . . . . . . . . . . . . . . . 1.320.37 . . . . . . . . . . . . . . . . . . . . . 1.280.38 . . . . . . . . . . . . . . . . . . . . . 1.240.39 . . . . . . . . . . . . . . . . . . . . . 1.200.40 . . . . . . . . . . . . . . . . . . . . . 1.1612ASME B31G-2012Table 3-3M Values of
41、L for Pipe Sizes 273 mm and 406 mm O.D.Wall Thickness, t,mmDepth,d, mm 4.0 5.6 6.4 7.8 8.7 9.3 11.1 12.70.5 147.4 No limit No limit No limit No limit No limit No limit No limit0.8 109.1 174.6 186.5 No limit No limit No limit No limit No limit1.0 61.3 150.4 186.5 206.7 218.8 225.4 No limit No limit1.
42、3 45.2 88.3 124.8 206.7 218.8 225.4 246.9 263.81.5 36.5 65.9 86.4 146.6 218.8 225.4 246.9 263.81.8 30.9 53.7 68.2 104.8 140.5 168.1 246.9 263.82.0 26.9 45.9 57.3 83.9 107.1 123.3 212.7 263.82.3 23.8 40.3 49.8 71.0 88.3 99.8 155.0 238.42.5 21.3 36.0 44.3 62.1 76.0 85.0 124.9 176.52.8 19.2 32.6 40.0 5
43、5.5 67.3 74.7 106.1 143.33.0 17.3 29.8 36.5 50.4 60.6 67.0 93.1 122.23.3 . . . 27.4 33.6 46.2 55.3 61.0 83.5 107.53.6 . . . 25.3 31.1 42.7 51.0 56.1 76.0 96.53.8 . . . 23.4 28.9 39.7 47.4 52.0 69.9 87.94.1 . . . 21.8 27.0 37.1 44.2 48.5 64.9 81.04.3 . . . 20.3 25.2 34.8 41.5 45.5 60.6 75.34.6 . . .
44、. . . 23.7 32.8 39.1 42.9 56.9 70.54.8 . . . . . . 22.2 31.0 37.0 40.5 53.7 66.35.1 . . . . . . 20.9 29.3 35.1 38.4 50.9 62.75.3 . . . . . . . . . 27.8 33.3 36.5 48.4 59.45.6 . . . . . . . . . 26.4 31.7 34.8 46.1 56.65.8 . . . . . . . . . 25.1 30.2 33.1 44.0 54.06.1 . . . . . . . . . 23.8 28.8 31.7
45、42.1 51.66.4 . . . . . . . . . . . . 27.5 30.3 40.3 49.56.6 . . . . . . . . . . . . 26.3 29.0 38.7 47.56.9 . . . . . . . . . . . . 25.1 27.7 37.2 45.77.1 . . . . . . . . . . . . . . . 26.6 35.7 44.07.4 . . . . . . . . . . . . . . . 25.5 34.4 42.47.6 . . . . . . . . . . . . . . . . . . 33.2 40.97.9 .
46、 . . . . . . . . . . . . . . . . . 32.0 39.58.1 . . . . . . . . . . . . . . . . . . 30.8 38.18.4 . . . . . . . . . . . . . . . . . . 29.7 36.98.6 . . . . . . . . . . . . . . . . . . 28.7 35.78.9 . . . . . . . . . . . . . . . . . . 27.7 34.69.1 . . . . . . . . . . . . . . . . . . . . . 33.59.4 . . .
47、. . . . . . . . . . . . . . . . . . 32.49.7 . . . . . . . . . . . . . . . . . . . . . 31.49.9 . . . . . . . . . . . . . . . . . . . . . 30.510.2 . . . . . . . . . . . . . . . . . . . . . 29.613(12)ASME B31G-2012Table 3-4 Values of L for Pipe Sizes NPS 16 and NPS 20Wall Thickness, t, in.Depth,d, in.
48、0.188 0.250 0.312 0.344 0.375 0.438 0.500 0.6250.02 7.77 No limit No limit No limit No limit No limit No limit No limit0.03 7.77 8.96 No limit No limit No limit No limit No limit No limit0.04 4.52 8.96 10.01 10.51 10.97 No limit No limit No limit0.05 3.06 6.00 10.01 10.51 10.97 11.86 12.67 No limit0
49、.06 2.39 4.15 7.41 10.51 10.97 11.86 12.67 No limit0.07 2.00 3.28 5.23 6.75 8.84 11.86 12.67 14.170.08 1.73 2.75 4.17 5.14 6.34 10.21 12.67 14.170.09 1.52 2.39 3.51 4.24 5.08 7.44 11.45 14.170.10 1.37 2.13 3.07 3.65 4.30 6.00 8.48 14.170.11 1.24 1.92 2.74 3.23 3.77 5.10 6.88 13.850.12 1.13 1.75 2.48 2.91 3.37 4.47 5.87 10.530.13 1.03 1.61 2.27 2.66 3.06 4.01 5.16 8.650.14 0.95 1.49 2.10 2.45 2.81 3.65 4.63 7.430.15 0.87 1.39 1.96 2.28 2.61 3.36 4.22 6.560.16 . . . 1.30 1.83 2.13 2.43 3.12 3.89 5.910.17 . . . 1.21 1.72 1.99 2.28 2.91 3.62 5.400.18 . . . 1.1
