TABLES:
AN EVALUATION OF EMAT TECHNOLOGY FOR HIGH-TEMPERATURE NDE

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Table 1
COMPARISON OF REMAINING WALL THICKNESS MEASURED MECHANICALLY (M), MEASURED ULTRASONICALLY (UT), AND AS DESIGNED (D) FOR EACH BLOCK
(The design remaining wall thickness is based upon using the actual material
thickness obtained for each block and subtracting the depth of the designed hole.)
BLOCK NUMBER CS-1
Defect ID Drawing ReferenceDefect Location in Test FixtureDesigned Diameter (in.)Remaining (D) Wall Thickness (in.)Remaining (M) Wall Thickness (in.)Remaining (UT) Wall Thickness (in.)
A1E8.125.218.230.245
A2C8.125.418.420.440
B1F7.250.118.150.140
B2D7.250.318.338.315
B3B7.250.518.510.540
C1E6.375.218.209.240
C2C6.375.418.406.420
D1F5.500.318.320.320
D2D5.500.118.127.140
D3B5.500.518.522.545
E1E4.750.218.224.225
E2C4.750.418.442.420
F1F31.00.318.305.320
F2D31.00.118.110.120
F3B31.00.518.516.580
G1F21.50.093.091.100
G2C21.50.143.133.160
G3E71.50.218.206.220
NaturalD8


.620
NaturalD8


.400

BLOCK NUMBER IN-1
Defect ID Drawing ReferenceDefect Location in Test FixtureDesigned Diameter (in.)Remaining (D) Wall Thickness (in.)Remaining (M) Wall Thickness (in.)Remaining (UT) Wall Thickness (in.)
A1F8.125.142.132.180
A2D8.125.342.301.380
A3B8.125.542.498.580
B1E7.250.286.242.290
B2C7.250.442.470.450
C1F6.375.342.330.360
C2D6.375.142.140.190
C3B6.375.542.526.600
D1E5.500.242.210.240
D2C5.500.442.413.440
E1F4.750.342.349.360
E2D4.750.142.140.200
E3B4.750.542.550.540
F1E31.00.242.251.280
F2C31.00.442.440.440
G1F21.50.092.096.120
G2D21.50.142.147.180
G3B21.50.192.178.200

BLOCK NUMBER CS-3
Defect ID Drawing ReferenceDefect Location in Test FixtureDesigned Diameter (in.)Remaining (D) Wall Thickness (in.)Remaining (M) Wall Thickness (in.)Remaining (UT) Wall Thickness (in.)
A1C7.125.200.233.240
B1D6.250.100.142.140
B2B6.250.300.331.320
C1C5.375.200.186.220
D1D4.500.100.100.140
D2B4.500.300.282.305
E1C3.750.200.223.220
F1D21.00.100.083.160
F2B21.00.300.300.320
G1C61.50.075.075.120
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Table 2
LIST OF DEFECTS CONTAINED IN TEST SPECIMEN CS-1 (INSPECTION OF 0.75 INCH CARBON STEEL AT AMBIENT TEMPERATURE) WITH ASSOCIATED DEFECT DIAMETER, MECHANICALLY MEASURED REMAINING WALL, EMAT TEAM RESULTS, AND CONVENTIONAL UT RESULTS
Defect LocationDefect TypeDefect Diameter (in.)Remaining Wall (in.)Contractor No. 1Contractor No. 2Contractor No. 3Conventional UT
Detection
(Y/N)		Remaining Wall (in.)Detection
(Y/N)		Remaining Wall (in.)Detection
(Y/N)		Remaining Wall (in.)Detection
(Y/N)		Remaining Wall (in.)
B3RBH1.000.515Y0.546Y0.400Y0.581Y0.580
B5RBH0.5000.522Y0.551Y0.200Y0.525Y0.545
B7RBH0.2500.520Y0.551Y0.300YNo DataY0.540
C2FBH1.500.133Y0.118Y0.150Y0.130Y0.160
C4RBH0.7500.442Y0.433Y0.400Y0.440Y0.420
C6RBH0.3750.18Y0.435Y0.200YNo DataY0.420
C8RBH0.1250.419YNo DataY0.125YNo DataY0.440
D3RBH1.000.110Y0.315Y0.200YNo DataY0.120
D5RBH0.5000.127Y0.197Y0.400YNo DataY0.140
D7RBH0.2500.338Y0.354Y0.200YNo DataY0.315
E4RBH0.7500.224Y0.236Y0.200YNo DataY0.225
E6RBH0.3750.209Y0.234Y0.200YNo DataY0.240
E7FBH1.500.206Y0.234Y0.400Y0.200Y0.220
E8RBH0.1250.219NNo DataY0.400YNo DataY0.245
F2FBH1.500.091Y0.117Y0.100Y0.085Y0.100
F3RBH1.000.305Y0.351Y0.300Y0.328Y0.320
F5RBH0.5000.320Y0.315Y0.300Y0.328Y0.320
F7RBH0.2500.150YNo DataY0.300YNo DataY0.140
D8Natural LaminationLess than 0.125UnknownY0.680NNo DataNNo DataY0.620
D8 Natural LaminationLess than 0.125UnknownNNo DataNNo DataNNo DataY0.400
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Table 3
LIST OF DEFECTS CONTAINED IN TEST SPECIMEN CS-2 (INSPECTION OF 0.75-INCH CARBON STEEL AT 800°F) WITH ASSOCIATED DEFECT DIAMETER, MECHANICALLY MEASURED REMAINING WALL, AND EMAT TEAM RESULTS (CONVENTIONAL UT WAS NOT CONDUCTED AT HIGH TEMPERATURE)
Defect LocationDefect Type
Defect Diameter (in.)		Remaining Wall (in.)Contractor No. 1Contractor No. 3
Detection
(Y/N)		Remaining Wall (in.)Detection
(Y/N)		Remaining Wall (in.)
B3RBH0.2500.150N No Data YNo Data
B5RBH0.5000.320YNo DataYNo Data
B7RBH1.000.305Y0.312YNo Data
B8FBH1.500.091Y0.079Y0.086
C2RBH0.1250.219YNo DataYNo Data
C3FBH1.500.206Y0.195Y0.200
C4RBH0.3750.209Y0.195YNo Data
C6RBH0.7500.224YNo DataYNo Data
D3RBH0.250.338YNo DataYNo Data
D5RBH0.5000.127YNo DataYNo Data
D7RBH1.000.110YNo DataYNo Data
E2RBH0.1250.419Y0.351YNo Data
E4RBH0.3750.418YNo DataYNo Data
E6RBH0.750.442YNo DataYNo Data
E8FBH1.500.133Y0.117Y0.130
F3RBH0.2500.520Y0.351YNo Data
F5RBH0.5000.522YNo DataY0.513
F7RBH1.000.515YNo DataY0.513
D2Natural LaminationLess than 0.125UnknownNNo DataNNo Data
D2Natural LaminationLess than 0.125UnknownNNo DataNNo Data
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Table 4
LIST OF DEFECTS CONTAINED IN TEST SPECIMEN CS-3 (INSPECTION OF 0.5-INCH CARBON STEEL AT AMBIENT TEMPERATURE) WITH ASSOCIATED DEFECT DIAMETER, MECHANICALLY MEASURED REMAINING WALL, EMAT TEAM RESULTS, AND CONVENTIONAL UT RESULTS
Defect LocationDefect TypeDefect Diameter (in.)Remaining Wall (in.)Contractor No. 1Contractor No. 2Contractor No. 3Conventional UT
Detection
(Y/N)		Remaining Wall (in.)Detection
(Y/N)		Remaining Wall (in.)Detection
(Y/N)		Remaining Wall (in.)Detection
(Y/N)		Remaining Wall (in.)
B2RBH1.000.300Y0.273Y0.200Y0.315Y0.320
B4RBH0.5000.282Y0.273Y0.100YNo DataY0.305
B6RBH0.2500.331Y0.078Y0.350YNo DataY0.320
C3RBH0.7500.223Y0.195Y0.300YNo DataY0.220
C5RBH0.3750.186Y0.234Y0.200YNo DataY0.220
C6FBH1.500.075Y0.078Y0.075Y0.075Y0.120
C7RBH0.1250.200Y0.196Y0.400YNo DataY0.240
D2RBH1.000.83YNo DataY0.150YNo DataY0.160
D4RBH0.5000.100YNo DataY0.400YNo DataY0.140
D6RBH0.2500.100Y0.156Y0.300YNo DataY0.140
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Table 5
DEFECT DETECTION CAPABILITIES OF EACH TEAM AT AMBIENT TEMPERATURE AND 800°F
Test TemperatureContractor No. 1Contractor No. 2Contractor No. 3
Ambient27 of 3028 of 3028 of 30
800°F16 of 20
(with one false call)		0 of 20
(did not perform high temperature inspection)		18 of 20
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Table 6
CAPABILITY TO DETERMINE REMAINING WALL THICKNESS TO WITHIN ±% ACCURACY
Team±10%±20%±100%±200%±300%Discussion
Contractor No. 1 (ambient)15 of 3018 of 3019 of 3020 of 3020 of 30Did not size 8 defects; did not detect 2 defects
Contractor No. 1 (800°F)2 of 207 of 207 of 207 of 207 of 20Did not size 11 defects; did not detect 2 defects
Contractor No. 2 (ambient)8 of 309 of 3022 of 3026 of 3028 of 30Did not detect 2 defects
Contractor No. 2 (800°F)No dataNo dataNo dataNo dataNo dataDid not collect data at 800°F
Contractor No. 3 (ambient)10 of 3010 of 3010 of 3010 of 3010 of 30Did not size 18 defects; did not detect 2 defects
Contractor No. 3 (800°F)5 of 205 of 205 of 205 of 205 of 20Did not size 13 defects; did not detect 2 defects
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Table 7
COMPARISON OF REMAINING WALL DETERMINATION FOR EMAT AND CONVENTIONAL ULTRASONICS FOR 0.75-INCH-THICK CARBON STEEL
Defect IDDiameter (in.)UT Remaining Wall (in.) at AmbientContractor No. 1Contractor No. 2Contractor No. 3
Remaining Wall (in.) at AmbientRemaining Wall (in.) at 800°FRemaining Wall (in.) at AmbientDid Not Take Data at 800°FRemaining Wall (in.) at AmbientRemaining Wall (in.) at 800°F
ROUND-BOTTOM HOLES
A10.1250.245No DataNo Data0.400No DataNo Data
A20.1250.440No DataNo Data0.125No DataNo Data
B10.2500.140No DataDid Not Detect0.300No DataNo Data
B20.2500.3150.354No Data0.200No DataNo Data
B30.2500.5400.5510.3510.300No DataNo Data
C10.3750.2400.2340.1950.200No DataNo Data
C20.3750.4200.435No Data0.200No DataNo Data
D10.5000.3200.315No Data0.3000.328No Data
D20.5000.1400.197No Data0.400No DataNo Data
D30.5000.5450.551No Data0.2000.5250.513
E10.7500.2250.236No Data0.200No DataNo Data
E20.7500.4200.433No Data0.4000.440No Data
F11.000.3200.3510.3120.3000.328No Data
F21.000.1200.315No Data0.200No DataNo Data
F31.000.5800.546No Data0.4000.5810.513
FLAT-BOTTOM HOLES
G11.500.1000.1170.0790.1000.0850.086
G21.500.1600.1180.1170.1500.1300.130
G31.500.2200.2340.1950.4000.2000.200
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Copyright © Rolf Diederichs, rd@ndt.net 1. Mar 1998