B00-MT-PRO-00045 - 0 RTR Validation Report [PDF]

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RTR VALIDATION REPORT (FOR OFFSHORE AND ONSHORE) BARZAN PIPELINE PROJECT EPC

TABLE OF CONTENTS 1. INTRODUCTION .................................................................................. 4 2. SCOPE................................................................................................. 4 3. DEFINITIONS AND ABBREVIATIONS................................................ 5 3.1

DEFINITIONS ...................................................................................................................................... 5

3.2

ABBREVATIONS ................................................................................................................................. 6

4. REFERENCE DOCUMENTS ............................................................... 7 4.1

CODES AND STANDARDS ................................................................................................................ 7

4.2

COMPANY REFERENCES ................................................................................................................. 7

4.3

CONTRACTORS REFERENCES ....................................................................................................... 7

5. PIPE CHARACTERISTICS .................................................................. 8 6. SUMMARY OF VALIDATION OPERATIONS ...................................... 8 6.1

INSPECTIONS for macro-sectioning scope ........................................................................................ 8

6.2

INSPECTIONS for comparison testing ................................................................................................ 8

7. RTR VALIDATION ............................................................................. 11 7.1

PERSONNEL QUALIFICATION ........................................................................................................ 11

7.2

EQUIPMENT ...................................................................................................................................... 11

7.3

PROCEDURES .................................................................................................................................. 12

7.4

MACRO SECTIONING SOW ............................................................................................................ 12

7.5

VALIDATION TESTS ......................................................................................................................... 12 7.5.1

General Comparison of RTR Techniques vs MACRO ...................................................... 13

8. CONCLUSION OF THE RTR VALIDATION REPORT....................... 16 9. APPENDICES .................................................................................... 16

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Revision Tracking Rev.

Date

0

25/01/2019

Issued for Construction (IFC)

Description of Revision

B

17/12/2018

Issued for Approval (IFA)

A

17/10/2018

Original Issue for CONTRACTOR’s Internal Review (IDC)

Hold Record Specify Hold Nr..

Section

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RTR VALIDATION REPORT (FOR OFFSHORE AND ONSHORE) BARZAN PIPELINE PROJECT EPC

1.

INTRODUCTION

The Barzan Pipeline Project includes decommissioning and installation of new pipeline to deliver sour gas from three well sites with unmanned wellhead platforms (BRZ-WHP1, BRZ-WHP2 and BRZ-WHP3), all located in the North Field Offshore of the State of Qatar, to an onshore Gas Plant located at Ras Laffan Industrial City (RLC), Qatar. The project will include also the installation of new MEG delivery system.

Figure 1 - Project Location

2.

SCOPE

This report presents the results of the validation of radiographic techniques intended for Barzan project. The validation was performed to demonstrate the capabilities of the RTR system and Conventional RT using specific radiographic techniques (both SWSI and DWSI), according to the project applicable RT procedures, to detect and size typical weld defects. Barzan RTR Validation Program was carried-out at Saipem Welding Laboratory in Ploiesti (Romania). The present report will serve to confirm and validate the capabilities of the RTR system and Conventional RT and to validate the specific project radiographic testing procedures. The RTR Validation has included the following activities: 

Preparation of defective welds;



RTR inspection of the defective welds (both SWSI and DWSI);



Conventional RT inspection of the defective welds;



Selection of defects for destructive testing;



Macro-sectioning of the selected defects and areas;



Comparison between Conventional RT vs RTR vs macro sectioning.

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3. 3.1

DEFINITIONS AND ABBREVIATIONS DEFINITIONS

COMPANY

Qatargas

CONTRACTOR

Saipem SpA.

SUBCONTRACTOR

All organizations selected and awarded by CONTRACTOR to supply a certain Project materials or equipment or whom a part of the WORK has been Subcontracted

PROJECT

Contract no.: 033884

DOCUMENTS

All incoming and outgoing correspondence (letters, faxes, telexes, e-mail, minutes of meetings), and Technical Documents.

PROJECT DOCUMENTS

Created and issued by the CONTRACTOR, include the following documents: Any document produced by a member of the CONTRACTOR team and needed for the execution of the CONTRACTOR’s scope, or which is a formal document required for submission to COMPANY or any other third party in the frame of the PROJECT, under the terms of the MAIN CONTRACT.

TECHNICAL DOCUMENTS

Drawings, calculations, specifications, procedures, technical reports, etc.

IBIS PAGE

CONTRACTOR’s Electronic Document Management System (EDMS)

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3.2

ABBREVATIONS

CS

Carbon Steel

CRA

Corrosion-Resistant Alloy

DWDI

Double Wall Double Image

DWSI

Double Wall Single Image

FL

Fusion Line

FS

Film Side

GMAW

Gas Metal Arc Welding

GTAW

Gas Tungsten Arc Welding

HAZ

Heat Affected Zone

ID

Inner Diameter

IQI

Image Quality Indicator

NDT

Non-Destructive Testing

OD

Outer Diameter

RT

Radiographic Testing

SOD

Source to Object Distance

SS

Source Side

SWSI

Single Wall Single Image

WPQT

Welding Procedure Qualification Testing

WPS

Welding Procedure Specification

WQT

Welder Qualification Test

WPQ

Welding Procedure Qualification

WT

Wall Thickness

t

Thickness

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4.

REFERENCE DOCUMENTS

4.1

CODES AND STANDARDS

Nr.

Document Name

Description

[1]

DNV OS F101

Submarine Pipeline Systems : October 2013

[2]

EN ISO 9712

Non-Destructive Testing. Qualification and Certification of NDT Personnel

[3]

ISO 11699-1

Non-Destructive Testing – Industrial Radiographic Film

[4]

EN ISO 17636-1

[5]

EN ISO 17636-2

[6]

ASTM E 747

4.2

COMPANY REFERENCES Nr.

4.3

Non-Destructive Testing of Welds – Radiographic testing Part 1: X- and gamma-ray techniques with film Non-Destructive Testing of Welds – Radiographic testing Part 2: X- and gamma-ray techniques with digital detectors Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image Quality Indicators (IQI) Used for Radiology

Document Name

Description

[7]

BZOF-MT-SPC-00011

Specification for welding of CRA Steel Line pipe

[8]

BZOF-MT-SPC-00030

Specification for Pipeline Radiography and Other NDT Services

CONTRACTORS REFERENCES Nr.

[9]

Document Name

WI-SPA-WELD-001-E

Description

Qualification and Certification of NDT Personnel

[10] WI-SPA-ENG-WELD-024-E

Calibration of Non-Destructive Testing Equipment

[11] B00-MT-PRO-00003

RT Procedure - Qualification SoW

[12] B00-MT-PRO-00023

RTR Procedure - Onshore SoW

[13] B00-MT-PRO-00044

RTR Validation Procedure (for Offshore and Onshore)

[14] BRZ-SSDR-002

SDR - Intermediate RT by RTR in DWSI Technique

[15] 033884-QRY-SAI-BGC-00072

TQ - IRT Assessment of Partial GTAW Manual Weld Deposit

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5.

PIPE CHARACTERISTICS

The RTR Validation was performed on the pipe configurations in Tables 1 and 2 below. 2no. CRA partial defective welds have been further subjected to macro sectioning and 2no. CRA partial defective welds have been used solely for Conventional RT and RTR comparison testing.

Weld ID

OD [inch]

WT [mm]

BAR-KASH-IPW-RT-01

32”

22.2 + 3

BAR-IPW-T-01

28"

15.9 + 3

Welding Process SWS + IPW J-bevel SWS + IPW J-bevel

Remarks IRT - Partial Weld Root + HP + IPW

IRT - Partial Weld Root + HP + IPW

Table 1 - Pipe Configurations used for macro sectioning

Weld ID

OD [inch]

WT [mm]

BAR - EMAT - 02

32”

26.3 + 3

BAR-SAI-TIE-IN-IRT-01

28"

26.3 + 3

Welding Process

Remarks

SWS + IPW J-bevel

IRT - Partial Weld Root + HP + int. SAW

GTAW

IRT - Partial Weld Root + HP

V-bevel tie-in

IRT - Partial Weld Root+HP+F1+F2

Table 2 - Pipe Configurations used for comparison testing

6. 6.1

SUMMARY OF VALIDATION OPERATIONS INSPECTIONS FOR MACRO-SECTIONING SCOPE

RTR Validation / Verification Program has been agreed with Company according to the RTR Validation Procedure, Ref. [13], consisting of a total number of 10 observations which were collected from the 2no. defective welds listed in Table 1. The purpose of the welds with deliberately induced flaws was to demonstrate the sensitivity and the capability to detect defects of various types, sizes and locations. The defective welds for macro sectioning scope were initially assessed with conventional RT, and with RTR in SWSI and DWSI and finally compared with results of Macro sectioning. The overall results confirms the sensitivity, the detection and the sizing capabilities of both conventional RT with films and RTR.

6.2

INSPECTIONS FOR COMPARISON TESTING

Two additional defective welds with partial CRA deposit, as shown in Table 2, have been subjected to several tests and inspected by both Conventional RT and RTR for comparison purposes as follows:

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

A J-prep partial CRA defective weld (BAR - EMAT - 02) of 32" OD x 12 mm WT partial CRA deposit has been subjected to Conventional RT in SWSI, to RTR in SWSI and to RTR in DWSI. The indications inside this weld have been assessed by all three methods individually. No deference was noted in terms of detection or sizing over all indications, except several individual pores reported additionally by RTR. The results are included in Table 3 and Appendix 8. It was concluded that RTR performed in DWSI technique is equivalent in terms of sensitivity, defects detection and sizing with both Conventional RT and RTR performed in SWSI. Therefore RTR in DWSI can be carried-out instead of SWSI on Barzan CRA partial girth welds whenever SWSI is not feasible or available or when specifically required, as per Ref. [14].

RTR in DWSI vs RTR in SWSI vs Conv. RT in SWSI (Weld No. BAR - EMAT - 02) IRT on J-bevel partial weld - 32" OD x 12mm WT deposit Conventional IRT (SWSI)

RTR (SWSI)

RTR (DWSI)

Indication

Position

Position

Position

POR < 1 mm

579

583 (D=0.8mm)

558 (D=0.9mm)

670 (D=0.7mm)

668 (D=0.5mm)

POR

695 (D=0.8mm)

690 (D=0.5mm)

POR < 1 mm

POR 816

820 (D=0.6mm)

785 (D=0.5mm)

SP

1003 - 1008

1010 - 1015

970 - 975

INT LOF

1270 - 1319

1270 - 1328

1220 - 1279

LOP

1440 - 1467

1448 - 1474

1394 - 1420

LOF DS

1568 - 1575

1573 - 1579

1550 - 1555

INT LOF US

1600 - 1625

1605 - 1629

1545 - 1570

WH

1613 - 1620

POR

1620 - 1624

1560 - 1563

1702 (D=0.6mm)

1638 (D=1mm)

LOP

1754 - 1778

1758 - 1783

1690 - 1715

LOF DS

1885 - 1905

1895 - 1907

1827 - 1838

LOF US

2244 - 2275

POR LOF DS

2375 - 2430

2252 - 2287

2170 - 2205

2340 (D=0.8mm)

2256 (D=1mm)

2390 - 2436

2304 - 2356

Table 3 – RTR in DWSI vs RTR in SWSI vs Conv. RT in SWSI 

A manual CRA defective partial defective weld (BAR-SAI-TIE-IN-IRT-01) of 32" OD with V30-bevel has been subjected to Conventional RT and RTR in both SWSI and DWSI techniques after a welded deposit of 4.5mm (Root + HP). The same inspections have been repeated after the weld deposit has been increased to 7.5mm with two additional weld layers (Fill 1 + Fill 2). Welding from Root to Fill 2 has been made with GTAW. All defects inside the weld have been properly detected and assessed by all methods on both partial deposits (after 4.5mm and after 7.5mm). No difference has been noticed in terms of sensitivity, detection and sizing. The results are included in Table 4 and Appendix 8. It was concluded that during Barzan project, the IRT in SWSI or in DWSI made by either Conventional RT or RTR can be carried-out on manual CRA welds in GTAW directly after Fill 1 + Fill 2 (7.5mm deposit), subjected to Company approval of Ref. [15]. COMPANY DOC NO.: B00-MT-PRO-00045

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IRT after 4.5mm deposit vs 7.5mm deposit (Weld No. BAR-SAI-TIE-IN-IRT-01) IRT after R+HP (4.5mm deposit) Conventional IRT (SWSI)

IRT after R+HP+F1+F2 (7.5mm deposit) RTR (SWSI)

Conventional IRT (DWSI)

Indication

Position

Position

Position

Position

Position

Position

Position

Position

INT LOF US

161 - 210

160 - 180

161 - 208

160 - 208

168 - 215

155 - 201

165 - 212

149 - 195

TI

287 (< 2 mm)

295 (D=1mm)

278 (< 2 mm)

282 (D=0.8mm)

292 (< 2 mm)

278 (D=1.1mm)

285 (< 2 mm)

266 (D=0.8mm)

TI

302 (< 2 mm)

310 (D=1mm)

292 (< 2 mm)

297 (D=0.6mm)

305 (< 2 mm)

293 (D=0.8mm)

300 (< 2 mm)

283 (D=0.8mm)

INT LOF US

352 - 365

362 - 367

370 - 377

378 - 383

362 - 365

LOF US

396 - 415

373 - 387

380 - 390

388 - 404

382 - 418

TRANSV INDICATION

412 - 415

424 - 428

400 - 404

408 - 412

420 - 423

408 - 411

410 - 413

393 - 396

LOF DS

604 - 617

565 - 618

602 - 615

560 - 600

620 - 623

534 - 609

600 - 623

588 - 591

758 - 808

731 - 778

INT LOF DS + US

755 - 812

Conventional IRT (DWSI)

RTR (DWSI)

Conventional IRT (SWSI)

760 - 825

POR CP

RTR (SWSI)

744 - 800

941 (D=0.7mm) 974 - 1020

985 - 1040

733 - 788

950 - 998

753 - 778

763 - 817

905 (D=1.0mm) 973 - 1018

370 - 404

794 - 807

353 - 356 372 - 408

925 (D=0.7mm) 980 - 1030

POR

967 - 1020

1150 - 1175

CP

1185 - 1200

1167 - 1217

1140 - 1170 1175 - 1190

1124 - 1176

1160 - 1190 1205 - 1216

Elong POR

1150 - 1210

357 - 393

935 (D=0.5mm) 985 - 1035

1077 (D=0.8mm)

CP

RTR (DWSI)

938 - 958 1046 (D=0.8mm)

1160 - 1190

1124 - 1144

1203 - 1213

1160 - 1173

1215 - 1220

1125 - 1130

LORF US

1215 - 1222

1310 - 1317

1200 - 1208

1280 - 1290

1225 - 1230

1308 - 1315

1222 - 1227

1178 - 1183

CP

1325 - 1375

1358 - 1408

1325 - 1375

1318 - 1353

1350 - 1390

1338 - 1388

1358 - 1398

1317 - 1338

CP

1522 - 1580

1547 - 1607

1515 - 1570

1500 - 1555

1552 - 1600

1535 - 1600

1550 - 1598

POR LOP

1643 (D=1.1mm) 1733 - 1777

1762 - 1812

1734 - 1775

1702 - 1750

1760 - 1800

LOF

1922 - 1972

1914 - 1971

1884 - 1933

1951 - 1978

1937 - 1987

2142 - 2165

RC (2195 - 2209)

2120 - 2141

LOP (2098 - 2108) RC (2117 - 2130)

2165 - 2198

LOP (2155 - 2167) RC (2174 - 2190)

POR

2235 (D=0.9mm)

SP

2277 - 2295

LOP

1950 - 1975

2056 (D=0.7mm) LOP (2177 - 2189)

2340 - 2400

2372 - 2434

2332 - 2386

2291 - 2347

2362 - 2416

2356 - 2413

1691 - 1731 1772 - 1827

1866 - 1868 Oversaturated area (1880 - 2086)

POR INT LORF US + DS

1770 - 1808

1842 - 1844

LOF INT LORF US + DS

1746 - 1790

1493 - 1541 1591 (D=1.2mm)

1880 - 1905 1988 (D=0.7mm)

2170 - 2203

2083 - 2117 2160 (D=0.9mm) 2160 - 2179

2360 - 2415

2275 - 2333

POR

2450 (D=1.3mm)

2366 (D=0.7mm)

LOF

2436 - 2440

2360 - 2363

Table 4 – IRT after 4.5mm deposit vs 7.5mm deposit COMPANY DOC NO.: B00-MT-PRO-00045

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7.

RTR VALIDATION

7.1

PERSONNEL QUALIFICATION

The RT technicians who performed evaluation during the RTR Validation Program have been qualified as ISO 9712 Level 2 minimum for the RT method. The certificates of personnel who performed the validation tests are presented in the Appendix 4 of this report.

7.2

EQUIPMENT

The RTR equipment used for project validation and intended for production comprises the High Definition Real Time Radiography (HDRTR) scanner-detector system mounted onto a customized motorized carriage and pipe band transport system. The proprietary Shaw Pipeline Services (SPS) scanner-detector incorporates a compact dual energy photon counting direct converting x-ray 12-bit detector, known as ‘TrueScan’. The pixel size is 100 μm. Radiographic line data is acquired constantly by the scanner-detector during translation movement across an object and then recompiled and displayed as a complete image by the computer and proprietary Shaw Pipeline Services (SPS) software system. Detector Characteristics: 

Diagnostic width of 76.8mm maximum



Pixel Resolution of 100μm x 100μm



Operating temperatures between -20⁰C to 55⁰C

During the RTR Validation the radiation was generated by X-Ray Tubes with below characteristics:  Directional X-Ray Tube: Manufacturer:

YXLON

Model:

SMART EVO 300D

Focal Spot Size:

3.0 mm

Max kV:

300 kV

Max mA (at max kV):

3 mA

Manufacturer:

GE

Model:

ERESCO 52 MF4-CL

Focal Spot Size:

0.5 mm x 5.5 mm

Max kV:

300 kV

Max mA (at max kV):

3 mA

 Panoramic X-Ray Tube:

The conventional RT has been performed with combination of C3 (D4) and C4 (D5) films and X-Ray sources. The certificates of the X-Ray tubes used during the RTR Validation are included in the Appendix 5. COMPANY DOC NO.: B00-MT-PRO-00045

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7.3

PROCEDURES

The RTR Procedure is detailed in document no. B00-MT-PRO-00023, Ref. [12], while the dedicated RTR Validation Procedure is detailed in document no. B00-MT-PRO-00044, Ref. [13]. The Conventional RT Procedure is detailed in document no. B00-MT-PRO-00003, Ref. [11]. During the Validation the X-Ray has been used as radiation source. The Conventional RT and RTR have been performed with all parameters and settings according to Class B of ISO 17636-1 and ISO 17636-2, respectively. Bothe SWSI and DWSI techniques have been included in the Validation Programme. The RTR Procedure Qualification was performed by running 2no. consecutive scans for each technique in order to establish the RTR parameters and to demonstrate that all requirements such as IQI sensitivity, Duplex IQI’s, and the SNR are in accordance to ISO 17636-2, Class B. For CRA intermediate inspection of partial welds, the sensitivity is considered out of normal specification requirements and was finally based on result achieved during Procedure Qualification Test. The same shall be considered in production phase when additional procedure qualification tests shall be performed using the exact equipment and technique available on site, and by checking the IQI sensitivity and duplex IQI. The results of the RTR Procedure Qualification are included in Appendix 7 of this report.

7.4

MACRO SECTIONING SOW

The RTR Validation included in total 10 defects subjected to macro sectioning as listed in Table 5 below. OD [inch]

WT [mm]

Welding Process

Remarks

Weld n˚

No. of defects for Macro-sectioning

32”

22.2 + 3.0

SWS + IPW

IRT - Partial Weld Root + HP + IPW

BAR-KASH-IPW-RT-01

6

28"

15.9 + 3.0

SWS + IPW

IRT - Partial Weld Root + HP + IPW

BAR-IPW-T-01

4

TOTAL no. of flaws for macro sectioning

10

Table 5 – Macro Sectioning SOW The purpose of the welds with deliberately induced flaws was to demonstrate the RTR and Conventional RT sensitivity and capability to detect defects of various types, sizes and locations.

7.5

VALIDATION TESTS

The RTR Validation activities were carried out at SHAW RTR Subcontractor facility in Great Yarmouth (UK) and at Saipem NDT Laboratory in Ploiesti (Romania). The validation consisted in preparation, inspection and macro-sectioning of defective welds. The defective welds were subjected to both RTR and Conventional RT inspections according to each applicable RT Procedure. The RT and RTR Reports for defective welds subjected to macro sectioning and for comparison testing can be found in Appendices 2 and 3 of this report. COMPANY DOC NO.: B00-MT-PRO-00045

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7.5.1

GENERAL COMPARISON OF RTR TECHNIQUES VS MACRO

A total number of 10 flaws were selected for macro sectioning from the 2 defective welds (Table 5) in agreement with the Company Representatives. These flaws are highlighted green in Appendix 1 and denominated with the sequence number. The same numbers were hard stamped on the pipe before salami sectioning and also followed in the Macro Reports presented in the Appendix 6 of this report. An overview of results is presented in Table 6 and Figures 2 and 3. The purpose of the macro-sectioning was to confirm the type of flaw, its vertical height and length. The height is shown in the macro reports and the length is based upon ± 5mm tolerance. The following general guidance was provided to the macro sectioning laboratory: 

If the start of the defect is not present, move in by 5mm increment until the defect is found. Then split the difference between the last two slices. Once the defect start is found within 2.5mm, follow increment specified between the two ends;



Move by 5mm increment until the defect disappears. Then split the difference between the last two slices. Then the defect end is found within 2.5mm;



For weld defects such as individual pores, the cutting shall be made longitudinally on weld on complete window from DS to US side. Milling shall be made until edge of weld, then starting from the edge of weld, the macro-slicing shall be made in increments of 0,5mm until defect will disappear. In such way the height, length and width of the defect can be provided. Width of defect will be given within 0.5mm (0.25mm each side).

Figure 2 - Comparison between Conv. RT, RTR and Macro Sectioning measurements (3D)

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Figure 3 - Comparison between Conv. RT, RTR and Macro Sectioning measurements (2D)

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CONVENTIONAL RT RESULTS

BAR-IPW-T-01

BAR-KASH-IPW-RT-01

RT Indication

Type of Indication

Position Length From

to

Remarks

RTR RESULTS - SWSI Technique Type of Indication

Position (Digital) From

to

RTR RESULTS - DWSI Technique

Length (Digital)

Type of Indication

Position (Digital) From

to

MACRO Results

Length (Digital)

Height [mm]

Depth [mm]

Length [mm]

Width [mm]

#2

LCP

280

320

40

IF

278.52

333.69

55.17

IF

277.28

321.37

44.09

0,9

18,6

55.0

-

# 10

LCP

472

505

33

IF

481.95

515.04

33.09

IF

448.80

481.15

32.35

1.0

18,5

40.0

-

# 17

LCP

770

785

15

IF

788.15

801.80

13.65

IF

733.17

744.43

11.26

1.9

16,3

15.0

-

# 36

POR

1315

≤ 2 mm

P

1352.08

1354.03

1.95

P

1240.41

1242.15

1.74

1.2

18,5

1.8

1.0

# 37

POR

1410

≤ 1 mm

P

1454.57

1455.17

0.60

P

1333.41

1334.01

0.60

0.5

14,5

0.5

0.5

# 47

LOP+LCP

1750

1811

61

IP

1804.86

1872.65

67.79

IP

1646.66

1710.51

63.85

2.1

19,9

60.0

-

#3

HB

486

488

2

HB

500.15

502.42

2.27

HB

482.08

483.88

1.80

0,9

23,5

5.0

-

# 15

POR

1829

P

1858.08

1859.30

1.22

P

1751.16

1752.32

1.16

0,2

23,1

1.0

1.0

# 17

HB

1865

1874

9

HB

1894.61

1902.78

8.17

HB

1783.77

1793.08

9.31

0,9

23,6

10.0

-

# 21

HB

2385

2430

45

HB

12.05

55.53

43.48

HB

2275.97

2317.12

41.15

0,8

23,5

35.0

-

< 1 mm

Table 6 - Comparison between Conv. RT, SWSI RTR, DWSI RTR and Macro Sectioning results

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RTR VALIDATION REPORT (FOR OFFSHORE AND ONSHORE) BARZAN PIPELINE PROJECT EPC

8.

CONCLUSION OF THE RTR VALIDATION REPORT

The Barzan specific project RTR Validation campaign has led to compare the RTR and Conventional RT weld assessments with macro sectioning for 10 flaws of different types distributed through the CRA partial deposit of 2no. defective welds. The overall results, as presented in Table 6, confirms that both Conventional RT and RTR performed in SWSI and DWSI radiographic techniques are suitable for actual project purpose. The intended radiographic inspection methodologies, either RTR or Conventional RT with films, are validated for project use in onshore and offshore scopes and can be applied for the inspection of both automatic J-prep and manual V-prep CRA partial welds, for IRT purpose. The project radiographic inspection methodologies with RTR and Conventional RT with films have been subjected to comparison tests in SWSI and DWSI on both J-prep and V-prep partial welds and on different partial weld deposits (4.5mm and 7.5mm), proving successful reliability in each condition and suitable defects detection. Therefore, the radiographic specific inspection techniques with Conventional RT and RTR and in particular the RTR TrueScan System have achieved good results in terms of sensitivity, detectability and assessment capability of typical project weld imperfections and are considered validated for Barzan project onshore and offshore scopes.

9.

APPENDICES

Appendix 1 – Conventional RT vs RTR Comparison Data ; Appendix 2 – RTR reports ; Appendix 3 – Conventional RT Reports ; Appendix 4 – NDT Personnel Certificates ; Appendix 5 – RT Equipment Certificates ; Appendix 6 – Macro Reports ; Appendix 7 – RTR Procedure Qualification Reports ; Appendix 8 – Comparison Tests Results.

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