SOP III-002 R00

Issued Date August 1, 2005

SOP No. III-002

VOLUME III USED DRILL PIPE Revision 0 Page No. 1 of 38 STANDARD OPERATING PROCEDURE

(Company Confidential) Evaluation of Pipe Body

Imperfections

Copyright 2005 Tuboscope, P.O. Box 808, Houston, Texas 77001

STANDARD OPERATING PROCEDURE

FOR

EVALUATION OF PIPE BODY IMPERFECTIONS NOTE: This document is considered COMPANY CONFIDENTIAL and is not to be distributed

in whole or in part outside the Company, without the express, written consent of the undersigned authority.

PROCEDURE APPROVAL: ___________________________ DATE: _____________

Vice President Inspection & Coating Product Line PROCEDURE APPROVAL: ___________________________ DATE: ______________ Director Quality & Technical Services


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INTRODUCTION The intent of this document is to provide a general operating guide for Tuboscope evaluation of imperfections detected in used drill pipe. The procedural methods to be adhered to while conducting an examination of imperfections occurring in used drill pipe tubular goods have been detailed within this document. Inspectors charged with responsibility for an inspection service must use the methods and procedures outlined herein are strictly adhered to during the imperfection prove-up process. Utilization of this document will require a thorough understanding of the content by the user. Information and/or specifications contained in this document meet or exceed those minimum applicable pipe imperfection prove-up requirements defined in API published Standards as interpreted by Tuboscope. This document does not replace API Recommended Practices as a reference source nor does it take precedence over API published documents or Customer Specifications in the case of a dispute.


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TABLE OF CONTENTS 1.0 Scope............................................................................................................................................ 5 2.0 Personnel Requirements.............................................................................................................. 6 3.0 Compliance With Prove-up Specifications................................................................................... 6 4.0 Definitions ..................................................................................................................................... 6 5.0 Equipment Requirements............................................................................................................. 7 5.5 Visible Light Sources.......................................................................................................... 7 5.16 Equipment Calibration........................................................................................................ 9 6.0 General Requirements 9 6.1 Prove-up Rack Spacing ..................................................................................................... 9 6.2 Prove-up Rack Height ........................................................................................................ 9 6.3 Types of Grinding ............................................................................................................... 9 6.3.1 Exploratory............................................................................................................ 9 6.3.2 Smoothing Exploratory Grinding ........................................................................ 10 7.0 Location and Evaluation of Buggy Unit Indications...............................................................10 7.2 Evaluation of External Indications ...............................................................................10 7.3 Evaluation of Internal Indications ................................................................................11 8.0 Location and Evaluation of Automated Unit Indications........................................................12 8.7 Drill Pipe Body Indications (Except for FLUT Indications)............................................... 12 8.8 Critical/Slip Area External Indications.............................................................................. 13 8.9 Critical/Slip Area Internal Indications ............................................................................... 13 8.10 FLUT Indications .............................................................................................................. 13 8.10.3 For Ferromagnetic Materials .............................................................................. 14 8.10.4 For Non Ferromagnetic Materials....................................................................... 14 9.0 Evaluation and Disposition of Outside Surface Imperfections................................................... 15 9.2 Cracks............................................................................................................................... 15 9.3 Depth Measurement of Imperfections.............................................................................. 15 9.4 Determination of Remaining Body Wall (RBW)............................................................... 16 9.5 Exploration........................................................................................................................ 16 10.0 Evaluation and Disposition of Internal Surface Imperfections ................................................... 17 10.3 Visual Verification of Internal Cracks ............................................................................... 17 10.3.1 Optiscope Procedures........................................................................................ 18 10.3.2 Imperfection Size Chart ...................................................................................... 18 11.0 Evaluation and Disposition of Dents or Other Mechanical Damage ......................................... 18 12.0 Post Evaluation Procedures....................................................................................................... 19 Table 7.2.3 1 - Classification of Used Drill Pipe: 2-3/8 in., 6.65#/ft., 0.280 in................................ 20 Table 7.2.3 2 - Classification of Used Drill Pipe: 2-7/8 in., 10.40#/ft., 0.362 in.............................. 21 Table 7.2.3 3 - Classification of Used Drill Pipe: 3-1/2 in., 9.50#/ft., 0.254 in................................ 22 Table 7.2.3 4 - Classification of Used Drill Pipe: 3-1/2 in., 13.30#/ft., 0.368 in.............................. 23 Table 7.2.3 5 - Classification of Used Drill Pipe: 3-1/2 in., 15.50#/ft., 0.449 in.............................. 24 Table 7.2.3 6 - Classification of Used Drill Pipe: 4 in., 14.00#/ft., 0.330 in. ................................... 25 Table 7.2.3 7 - Classification of Used Drill Pipe: 4-1/2 in., 13.75#/ft., 0.271 in.............................. 26 Table 7.2.3 8 - Classification of Used Drill Pipe: 4-1/2 in., 16.60#/ft., 0.337 in.............................. 27 Table 7.2.3 9 - Classification of Used Drill Pipe: 4-1/2 in., 20.00#/ft., 0.430 in.............................. 28


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Table 7.2.3 10 - Classification of Used Drill Pipe: 5 in., 16.25#/ft., 0.296 in. ................................. 29 Table 7.2.3 11 - Classification of Used Drill Pipe: 5 in., 19.50#/ft., 0.362 in. ................................. 30 Table 7.2.3 12 - Classification of Used Drill Pipe: 5 in., 25.60#/ft., 0.500 in. ................................. 31 Table 7.2.3 13 - Classification of Used Drill Pipe: 5-1/2 in., 21.90#/ft., 0.361 in. .......................... 32 Table 7.2.3 14 - Classification of Used Drill Pipe: 5-1/2 in., 24.70#/ft., 0.415 in. .......................... 33 Table 7.2.3 15 - Classification of Used Drill Pipe: 5-7/8 in., 23.40#/ft., 0.361 in. .......................... 34 Table 7.2.3 16 - Classification of Used Drill Pipe: 5-7/8 in., 26.30#/ft., 0.415 in. .......................... 35 Table 7.2.3 17 - Classification of Used Drill Pipe: 6-5/8 in., 25.20#/ft., 0.330 in. .......................... 36 Table 7.2.3 18 - Classification of Used Drill Pipe: 6-5/8 in., 27.70#/ft., 0.362 in. .......................... 37 Table 10.3.2 Imperfection Size Chart................................................................................................ 38


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1.0 SCOPE 1.1 This procedure establishes the minimum requirements for evaluation and

subsequent disposition of pipe body indications located by visual, automated full body inspection methods (ultrasonic and electromagnetic flux leakage inspection [EMI]), magnetic particle inspection, liquid penetrant inspection and ultrasonic inspection. Tubular products covered by this procedure include used drill pipe.

1.2 Evaluation of thread imperfections is not covered in this document. Refer to

SOP III-100. 1.3 This Tuboscope document is the controlling document whenever any other like

kind prior-dated Tuboscope inspection procedures are in conflict. 1.4 The latest revision of the following documents were used as references for

establishing this procedure: 1.4.1 A.P.I. Specification 5D Drill Pipe.

1.4.2 A.P.I. Recommended Practice 7G Recommended Practice for Drill Stem Design and Operating Limits.

1.4.3 A.P.I. Standard 5T1 Imperfection Terminology. 1.4.4 A.S.T.M. E 1316 Standard Terminology for Nondestructive

Examinations.

1.4.5 SOP III-001 General Requirements. 1.4.6 SOP III-100 Visual and Dimensional Inspection.

1.4.7 SOP III-101 - Tuboscope Optical Instrument. 1.4.8 SOP III-200 Magnetic Particle Inspection. 1.4.9 SOP III-400 Ultrasonic Prove-up. 1.4.10 SOP III-403 Manual Ultrasonic Thickness Gauging.

1.4.11 SOP III-501 Liquid Penetrant Visible Solvent Removable Method. 1.4.12 Standard DS-1 Drill Stem Design and Inspection.


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1.4.13 NS-2 North Sea Drillstring Inspection Standard. 2.0 PERSONNEL REQUIREMENTS Personnel performing the evaluation techniques outlined in this procedure shall be

certified, as applicable, in Magnetic Particle Testing, Ultrasonic Testing and/or Penetrant Testing and qualified in Ultrasonic Thickness Gauge Unit Operation (code 35) in accordance with 4.0 in SOP III-001.

3.0 COMPLIANCE WITH PROVE-UP SPECIFICATIONS

The Inspectors method of performing imperfections prove-up shall comply with the specifications contained in this document unless customer specifications are provided. Should customer specifications be provided, a notation will be made on the inspection report indicating customer designated imperfection prove-up specifications were followed.

4.0 DEFINITIONS

4.1 Defect. An imperfection of sufficient magnitude to warrant rejection of the product based on criteria defined in applicable Tuboscope SOP or customer specification. A.P.I. 5D.

4.2 Discontinuity. A lack of continuity or cohesion; an intentional or unintentional

interruption in the physical structure or configuration of a material or component. A.S.T.M. E1316.

4.3 Evaluation. A review, following interpretation of the indications noted, to

determine whether they meet specified acceptance criteria. A.S.T.M. E1316. 4.4 Imperfection. A discontinuity in the product wall or on the product surface that

can be detected by the inspection methods contained in this Tuboscope SOP manual. A.P.I. 5D.

4.5 Indication. The response or evidence from a nondestructive examination. An

indication is determined by interpretation to be relevant, non-relevant, or false. A.S.T.M. E1316.

4.6 Interpretation. The determination of whether indications are relevant,

nonrelevant, or false. A.S.T.M. E1316.

4.7 Linear Imperfection. Linear imperfections include, but are not limited to, seams, laps, cracks, plug scores, cuts and gouges. A.P.I. 5D.


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4.8 Non-linear Imperfection. A non-linear imperfection includes, but is not limited to, pits and round bottom die stamping. A.P.I. 5D. They may also be defined as any imperfection whose length is less than three (3) times its width, such as a pit. They may also be referred to as a volumetric imperfection.

4.9 Relevant Indication or Imperfection. Any indication or imperfection that has the

potential of being a defect because of its signal amplitude or depth or because it may reduce the remaining wall thickness to less than specified pipe wall thickness.

4.10 Specified Wall Thickness. The tabulated material wall thickness corresponding

to either the specified outside diameter and weight or the specified outside diameter and specified inside diameter.

4.11 Wall Thickness. The actual wall thickness of a tubular product caused by

variations in pipe roundness, cross-section or eccentricity. 5.0 EQUIPMENT REQUIREMENTS Fully operational equipment and an adequate level of supplies shall be available at the

job site, except items in 5.3 and 5.7 which may be obtained on an as need basis. The equipment and/or supplies should comply with applicable Tuboscope Engineering Specifications, Company Safety Policy, and State or Federal Regulations for Safety. As a minimum, the following applicable equipment shall be available to locate, explore and evaluate pipe body imperfections:

5.1 An AC powered blower or air compressor. 5.2 Metal marker (paint marker).

5.3 An optical instrument as defined in SOP III-101, shall be used to aid in the

location/evaluation of internal surface imperfections.

5.3.1 Borescopes shall be capable of displaying the date on a penny, dime or Jaeger J4 letters placed within 4 inches (10 cm) of the objective lens. The borescope shall be checked whenever all or part of the borescope is assembled or re-assembled during the inspection process.

5.4 Wire brush. 5.5 Light Sources. Overhead lighting and hand-held white light fixtures shall meet the

requirements of 9.2 in SOP III-001.


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5.6 Magnetic particle testing equipment, as defined in SOP III-200, may be used to aid in the location of imperfections in ferromagnetic material.

5.6.1 An electromagnetic AC or DC yoke with adjustable legs shall be used for

material with an outside diameter of 5 inches (127 mm) or less. Fixed leg yokes may be used on material with an outside diameter 5-1/2 inches (140 mm) and larger.

NOTE: A pre-existing or induced longitudinal magnetic field may be used in lieu

of the yoke. 5.6.2 The application of dry magnetic particles to inside surface shall be

through the use of a non-ferrous trough.

5.7 Liquid penetrant testing equipment, as defined in SOP III-501, may be used to aid in the location of imperfections in non-ferromagnetic material.

5.8 An ultrasonic thickness gauge, as defined in SOP III-403, shall be used to aid in

the location/evaluation of imperfections in ferromagnetic and non-ferromagnetic material.

5.9 An ultrasonic flaw detector, as defined in SOP III-400, shall be used to aid in the

location/evaluation of internal surface imperfections in ferromagnetic and non-ferromagnetic material.

5.10 A grinder and/or a inch (6,4 mm) round file for probing the depth of accessible

imperfections. An additional disk grinder may be required for contouring of acceptable imperfections and buffing wheels for surface preparation.

5.10.1 A flat file may also be used for removing metal protrusions from the

material surface. 5.10.2 For non-ferrous material, non-metallic grinding wheels shall be used.

5.11 A dial depth gauge for measuring imperfection depth with graduations in 0.001

inch (0,01 mm) or smaller units. 5.11.1 The depth gauge shall be equipped with a conical needle-point contact

with a minimum height of 0.200 inch (5 mm) and a maximum tip diameter of 0.025 inch (6,4 mm).

5.12 An outside micrometer for measuring applicable pipe or upset outside diameters.

The micrometer shall have graduations in 0.001 inch (0,01 mm) or smaller units


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with contacts which are flat or rounded. 5.13 A steel rule with graduations in 1/64 inch (0, 5 mm) or smaller units. 5.14 A flat non-tinted mirror which provides a non-distorted image. The reflecting

surface shall be kept clean. 5.15 O.D. and I.D. spring calipers may be used to determine the pipe or upset

diameters. The contacts of the calipers shall be flat. 5.16 Equipment Calibration. Equipment calibration / verification shall be in

accordance with 9.1 in SOP III-001.

5.16.1 Dial depth gauges, micrometers and calipers shall be calibrated, after any repairs and at the frequency specified in Table 9.1 in SOP III-100.

5.16.2 The micrometer end measuring rods and the lifting power of

electromagnetic yokes shall be verified after any repair and at the frequency specified in Table 9.1 in SOP III-100.

5.17 All precision measuring/testing equipment and reference standards shall be

exposed to the same ambient temperature as the pipe surface for a minimum of 30 minutes prior to any examination(s).

6.0 GENERAL REQUIREMENTS When applicable, all reject information from automated inspection system prove-up

reports and end area inspections shall be transferred to a defect summary sheet and masterlog. This information is to be included in the formal report to the customer and shall become a permanent record to be kept on file for later reference.

6.1 Prove-up Rack Spacing. Space should be available for rolling the pipe and

walking between the adequately secured pipe. Enough space for at least three (3) complete rotations of the pipe should be adequate, in most cases.

6.2 Prove-Up Rack Height. A quality and accurate prove-up examination can be

performed when the pipe is at a convenient height for observing ID and OD imperfections.

6.3 Types of Grinding

6.3.1 Exploratory. Exploratory grinding should be round bottomed. To avoid

over-grinding, leave some trace of the imperfection across the bottom of


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the grind. 6.3.2 Smoothing Exploratory Grinds. Contour all exploratory grinds with

generous radii in acceptable pipe. Also, all grinds in acceptable pipe should be coated with rust inhibitor.

7.0 LOCATION AND EVALUATION OF BUGGY UNIT INDICATIONS 7.1 As the buggy is traversed down the length of drill pipe and a suspect indication

appears on the log or display, the operator must stop the buggy and prove-up the indication immediately. After the buggy is stopped, the flaw lights (when applicable) on the desk can be used for approximate location of the indication.

7.1.1 Using a marker, mark the shoe location on the pipe that corresponds to

the desk light. 7.1.2 Remove the buggy from the length. 7.2 Evaluation of External Indications 7.2.1 Visually examine the external surface of the questionable area for obvious

imperfections. 7.2.2 If the imperfection is determined to be large enough to down grade such

as a pit, gouge, formation cut, slip cut or other visual surface condition, determine the depth using a depth gauge and the adjacent wall thickness using an ultrasonic instrument in accordance with 9.3 and 9.4.

7.2.3 Refer to the applicable Table 7.2.3 - 1 through 7.2.3 18 for classification. 7.2.4 In the absence of obvious external surface imperfections, dry magnetic

particle inspection must be performed. With the buggy mag coil in the "ON", positioned and placed approximately 6 to 12 inches (15 to 30 cm) from the marked area, lightly sprinkle dry magnetic particles over the suspect area. Using your hand, smooth the particles across the area. If the suspect imperfection is on the external surface, the powder will accumulate on or around the imperfection.

7.2.5 Determine the depth of all imperfections/defects holding powder, except

fatigue cracks, using a file or grinder. The presence of a fatigue crack is cause for classifying the material as unfit for further drilling service.


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7.2.6 All grinds must be contoured and the area reinspected unless the pipe is classified as unfit for further drilling service.

7.2.7 Classify the pipe in accordance with applicable Table 7.2.3 - 1 through

7.2.3 18. 7.3 Evaluation of Internal Indications 7.3.1 In some cases a "fuzzy" type magnetic particle build will appear on the

external surface but nothing can be found on the external pipe surface. This could be an indication of an internal surface imperfection. In this case, the internal surface of the pipe must be examined in the questionable area.

7.3.2 If necessary, clean the inside of the pipe with a rotary wire brush and blow

out all excess residue. 7.3.3 With the buggy mag coil "OFF", use a non-magnetic trough to place dry

magnetic particles inside the pipe in the suspect area. 7.3.4 With the buggy mag coil placed 6 to 12 inches (15 to 30 cm) from the

marked area, turn the coil "ON" and roll the pipe at least one (1) full revolution.

7.3.5 Examine the questionable area using a hand-held light or mirror or with an

optical instrument in accordance with 10.3. 7.3.6 If a powder build is present, lightly tap the pipe around the area. If a

transverse powder build remains in the area, the length most likely is cracked and must be classified according.

7.3.7 If only pitting is present, determine the remaining wall thickness above the

pitting, in accordance with 9.4 and classify the pipe in accordance with the applicable Table 7.2.3 - 1 through 7.2.3 18, or customer specifications.

7.3.8 If, after all proper prove-up procedures have been performed, crack like

indications still appear on the log or display when the buggy is traversed over the area in question, the length will be placed in a lower classification depending on the general condition and known failure history of the drill string. If several lengths with this condition exist in the string, the customer must be notified as to the proper disposition of these lengths.


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8.0 LOCATION AND EVALUATION OF AUTOMATED UNIT INDICATIONS 8.1 For automated inspection systems (EMI and FLUT) without a paint marking

system, all information gathered during the evaluation of indications shall be documented on a runsheet or masterlog and correlated to the prove-up report.

8.2 For automated inspection systems (EMI and FLUT) with a paint marking system,

all information gathered during the evaluation of indications shall be documented on a prove-up report and correlated to the computer print-out or map.

8.3 A Prove-up Report shall be maintained, by the prove-up personnel, during

prove-up to document all indications and the results of the prove-up, by joint number. The operator shall initial each page of the Prove-up Report indicating that the report is correct and correlates with the runsheet or computer flag report.

8.4 Multiple indications from automated inspection systems shall be evaluated

beginning with the most severe indication and proceeding to either end. If the joint is rejected at any point, further evaluation shall not be performed unless required by the customer.

8.5 These documents shall be kept current and shall be returned to the operator

when completed. After approval by the operator, the automated inspection system runsheet and prove-up report shall be checked for completeness and accuracy by the plant manager or his assistant/lead person.

8.6 The area of interest, as defined by the applicable automated unit Tuboscope

SOP, shall be investigated. All areas shall be investigated using all or a combination of visual, magnetic particle or ultrasonic techniques.

8.7 Drill Pipe Body Indications (Except for FLUT Indications)

8.7.1 Areas to be investigated shall be visually examined and then an AC yoke shall be used for magnetic particle investigation. The yoke shall be applied with its handle oriented at approximately 90 to the estimated orientation of the indication. The yoke legs shall overlap 50% to ensure complete coverage with maximum sensitivity. The area to be yoked is defined in the applicable SOP.

8.7.2 Once the imperfection has been identified, proceed in accordance with

9.0.

8.7.3 If an imperfection cannot be located, scan the area with compression


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wave ultrasonics, searching for internal pitting in accordance with 6.3 in SOP III-403.

8.7.4 If an imperfection cannot be located using the techniques in 8.7.3, the

area shall be further investigated in accordance with 7.3. 8.7.5 If an imperfection cannot be located using the techniques in 8.7.4, the

joint shall be re-inspected through the unit and if the indications still appear on the log or display, the length will be placed in a lower classification depending on the general condition and known failure history of the drill string. If several lengths with this condition exist in the string, the customer must be notified as to the proper disposition of these lengths.

8.8 Critical/Slip Area External Indications 8.8.1 Areas to be investigated shall be inspected in accordance with 8.7.1 and

8.7.2.

8.8.2 If the indication is not located as described above, scan the area using shear wave ultrasonics in accordance with the requirements in SOP III-400.

8.8.3 If an imperfection cannot be located using the technique in 8.8.2, the

area shall be classified as acceptable. 8.9 Critical/Slip Area Internal Indications

8.9.1 Areas to be investigated shall be examined with shear wave ultrasonics, searching for subsurface and/or internal surface breaking imperfections in accordance with SOP III-400. The area to be examined is defined in the applicable SOP.

8.9.2 If an imperfection cannot be located, visually inspect the internal surface

with a light, searching for internal pitting.

8.9.3 If an imperfection cannot be located, scan the area with compression wave ultrasonics, searching for internal pitting in accordance with 6.3 in SOP III-403.

8.9.4 If an imperfection cannot be located using the technique in 8.9.3, the

area shall be classified as acceptable. 8.10 FLUT Indications. All information gathered during the evaluation of indications


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shall be documented on a runsheet or masterlog and correlated to the prove-up report (computer print-out or map).

8.10.1 These documents shall be kept current and shall be returned to the

operator when completed. After approval by the operator, the automated inspection system runsheet and prove-up report shall be checked for completeness and accuracy by the plant manager or his assistant/lead person.

8.10.2 The area of interest, as defined in the applicable SOP, shall be

investigated. All areas shall be investigated using all or a combination of visual, magnetic particle, ultrasonic or liquid penetrant techniques (when applicable).

8.10.3 For Ferromagnetic Materials. Relevant indications shall be investigated

for imperfections by visual, magnetic particle and/or ultrasonic methods.

a. External Surface Investigation. Investigate the area in accordance with 8.8.

b. Internal Surface Investigation. Investigate the area in accordance

with 8.9. 8.10.4 For Nonferromagnetic Materials. Relevant indications shall be

investigated for imperfections by visual, ultrasonic and/or liquid penetrant methods.

a. External Surface Investigation 1. Areas to be investigated shall be visually inspected and then

shear wave ultrasonics shall be used for evaluation in accordance with SOP III-400.

2. If an imperfection cannot be located, liquid penetrant testing shall

be used for further investigation in accordance with SOP III-501. 3. If an imperfection cannot be located using the techniques in

8.10.4.a.1 and 8.10.4.a.2, the area shall be classified as acceptable.

b. Internal Surface Investigation 1. Areas to be investigated shall be inspected with shear and


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compression wave ultrasonics, searching for subsurface and/or internal surface breaking imperfections in accordance with SOP III-400 and SOP III-403, respectively. The area to be inspected is defined in the applicable SOP.

2. If an imperfection cannot be located using the techniques in

8.10.4.b.1, the area shall be classified as acceptable. 8.11 All prove-up markings shall be blacked out or completely removed from the

outside surface of acceptable material after all indications have been fully evaluated.

9.0 EVALUATION AND DISPOSITION OF OUTSIDE SURFACE IMPERFECTIONS

9.1 The area of interest as defined by the method(s) which initially located the indication shall be clearly defined. Subsequent method(s) shall be employed to more clearly define the nature and relevancy of the indication, (i.e.; visual, magnetic particle, liquid penetrant, ultrasonics, etc.) its orientation and location (internal or external surface). Refer to the applicable Table 7.2.3 - 1 through 7.2.3 18 for calculated pipe body wall thickness values.

9.2 Cracks. Confirmed cracks located by any method are cause for rejection without

further investigation. Internal cracks should be confirmed visually in accordance with 10.3.

9.3 Depth Measurement of Imperfections. Zero the dial depth gauge on a flat

surface such as a mirror or glass, not on the material surface. If the normal pipe contour is irregular or has a dent, the depth gauge shall be zeroed adjacent to the imperfection. The dial depth gauge shall be placed on the material surface with the anvil parallel to the longitudinal axis of the material. Ensure that the contact is placed in the deepest part of the imperfection or grind. The gauge shall be held upright and perpendicular to the material surface, leaning of the gauge during measurement is prohibited.

NOTE: The reference to grinds in the above paragraph is only applicable to

manufacturing imperfections. Refer to 9.5.

9.3.1 Before measurement ensure that all varnish, loose scale and metal protrusions have been removed with a flat file.

9.3.2 Re-verify the zero setting of the dial depth gauge prior to rejecting any

material.


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9.3.3 Classification shall be based on RBW. Proceed in accordance with 9.4. 9.3.4 When specified by the customer, imperfections in I.E of Table 7.2.3 - 1

through 7.2.3 18, may be removed if adequate body wall exists which would permit complete removal of the defect. Complete defect removal shall be verified using MT. Proceed in accordance with 9.4 to make this determination.

NOTE: Customer specifications may supersede these dispositions.

NOTE: The removal of fatigue cracks is not permitted. 9.4 Determination of Remaining Body Wall (RBW). Using an ultrasonic thickness

gauge in accordance with SOP III-403, measure the wall thickness adjacent to the deepest portion of the imperfection on each side of the imperfection or exploratory probe grind. Subtract the depth of the imperfection or grind from the average of these two (2) wall readings. If the resultant wall thickness is less than one (1) of the minimum remaining wall thickness values defined in the applicable Table 7.2.3 - 1 through 7.2.3 18 or customer specification, the length shall be classified accordingly.

NOTE: The reference to grinds in the above paragraph is only applicable to

manufacturing imperfections. Refer to 9.5.

9.4.1 Record on the Drill Pipe Inspection Tally Sheet, in the Wall Thickness column, ONLY if this is the most severe bodywall reduction for the length. If recorded, record in a decimal form in thousandths of an inch, i.e.: 0.265".

NOTE: 9.5 is applicable only to manufacturing imperfections. 9.5 Exploration. For manufacturing imperfections, such as seams and laps, which

do not allow direct depth measurement may need to be probed to determine the depth. Probing shall be performed with either a file or grinder.

9.5.1 Prior to removing any surface metal, the surrounding body wall shall be

measured with an ultrasonic thickness gauge in accordance with SOP III-403. A determination shall be made on the amount of metal to be removed based on the resultant surrounding body wall.

9.5.2 Probing the imperfection shall be performed carefully to ensure a defect

is not created by over-grinding. For non-radial type imperfections, follow the imperfection with the grinder or file so that when completed, the


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imperfection is located in the deepest part of the probed area. a. Probe only deep enough to meet the rejection criteria or until the

imperfection has broken, whichever is less. Probing shall be performed in such a manner as to ensure no sharp edges are produced.

b. For imperfections exceeding 1/2 inch (13 mm) in length, probe the

imperfection in several locations throughout its length to locate the deepest part of the imperfection.

9.5.3 If adequate body wall exists which would facilitate removal of the

imperfection, and removal is requested by the customer, the imperfection may be removed by contour grinding and re-verifying the remaining body wall after complete removal. Allow the contoured area to cool to approximately the same surface temperature as the surrounding pipe body prior to taking wall thickness measurements.

NOTE: Materials expand when heated, therefore, wall thickness readings taken

on hot material may be in error.

a. Re-inspect the ground area with using magnetic particles. b. All grinds shall be coated with a rust inhibitor (or black enamel paint)

after grinding/evaluation has been completed.

9.5.4 If a defect cannot be removed to salvage the material, the length shall be classified in accordance with the applicable Table 7.2.3 - 1 through 7.2.3 18.

10.0 EVALUATION AND DISPOSITION OF INSIDE SURFACE IMPERFECTIONS 10.1 The area of interest as defined by the method(s) which initially located the

indication shall be clearly defined. Subsequent method(s) may be employed to more clearly define the nature and relevancy of the indication (i.e.; visual [borescope], magnetic particle, ultrasonics, etc.). Compression wave ultrasonics shall be used to locate and evaluate the imperfection. Ultrasonic thickness gauging shall be performed in accordance with SOP III-403.

10.2 Imperfections which cannot be located through the use of compression wave

ultrasonics should be evaluated with the use of shear wave ultrasonics in accordance with SOP III-400.

10.3 Visual Verification of Internal Cracks. To confirm the presence of internal cracks


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and/or to distinguish pit signals from cracks, further evaluation shall be performed using dry magnetic particles, a coil and/or an optical instrument in accordance with 7.3 and 10.3, respectively.

NOTE: The use of MT on internally coated drill pipe may not yield acceptable results

and the evaluation may be limited to ultrasonics. 10.3.1 Optiscope Procedures. Assemble the borescope instrument in

accordance with SOP III-101. Care shall be used to protect the borescope electrical cord, it must be kept in excellent condition and grounded to eliminate electrical shock hazards. Be sure that all needed centralizer baskets have been attached.

a. The area to be evaluated should have been precisely marked during

the initial inspection which detected the imperfection. b. Lay the optical instrument alongside the pipe and place the illuminating

head by the chalked area. c. Wrap a piece of tape around the instrument at the point which is

aligned with the pipe end. d. Slowly slide the optical instrument into the pipe end to be inspected.

One (1) person must be located at the illuminated head end and the other at the eye piece end, then position the illuminating head near the area to be inspected.

e. Plug the isolation transformer power cable into a 110 volt outlet. Next

plug the illuminating head cable into the transformer. f. Using the tape as a distance marker locate the imperfection and

determine its size and severity in accordance with 10.3.2. 10.3.2 Imperfection Size Chart. Table 10.3.2 is a chart showing the relationship

between the size of the image viewed versus the actual size of the imperfection. When used properly, this chart will enable the operator to more accurately estimate the size of the imperfection.

11.0 EVALUATION AND DISPOSITION OF DENTS OR OTHER MECHANICAL DAMAGE

Dents shall be evaluated using a micrometer or spring caliper in accordance with the applicable Table 7.2.3 - 1 through 7.2.3 18.


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Imperfections


12.0 POST EVALUATION PROCEDURES

Other applicable post inspection procedures in 18.0 of SOP III-001 shall be followed.


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Table 7.2.3 - 1 - Classification of Used Drill Pipe

2-3/8 in., 6.65#/ft., 0.280 in. 60,3 mm, 9,9 kg/m, 7,11 mm

1/32 in. = 11.1% wall 1/32 in. = 1.3% OD 1/32 in. = 0,79 mm

Pipe Body Condition Premium Class1

Two White Bands One Center Punch Mark

Class 2 One Yellow Band

Two Center Punch Marks

Class 3 One Orange Band

Three Center Punch Marks I. Exterior Conditions

A. OD Wear Wall

Not less than 0.224 in. (5,70 mm)


Any imperfection or damages exceeding Class 2

B. Dents & Mashes Crushing, necking Not over 5/64 in. (1,8 mm) Not over 3/32 in. (2,4 mm)

C. Slip Area Mechanical Damage Cuts2, gouges2

Depth not over 10% of average adjacent wall4


D. Stress Induced Diameter Variations

1. Stretched Not over 5/64 in. (1,8 mm) Not over 3/32 in. (2,4 mm)

2. String Shot Not over 5/64 in. (1,8 mm) Not over 3/32 in. (2,4 mm) E. Corrosion, Cuts, & Gouges

1. Corrosion Not less than 0.224 in. (5,70 mm) Not less than 0.196 in.

(4,98 mm)

2. Cuts & Gouges

Longitudinal Not less than 0.224 in. (5,70 mm) Not less than 0.196 in.

(4,98 mm)

Transverse Not less than 0.224 in. (5,70 mm) Not less than 0.196 in.

(4,98 mm)

F. Cracks3 None None None II. Interior Conditions

A. Corrosive Pitting Wall

RBW not less than 0.224 in. (5,70 mm) measured from

base of deepest pit


base of deepest pit B. Erosion & Wear Wall



C. Cracks3 None None None

1. The premium classification is recommended for service where it is anticipated that torsional or tensile limits for class 2 drill pipe will be exceeded. These limits can be found in API RP 7G. Premium class shall be identified with two (2) white bands, plus one (1) center punch mark on the 35 or 18 shoulder of the pin end tool joint.

2. Remaining wall shall not be less than the value in I.E., defects may be ground out providing the remaining wall is not reduced below these values and such grinding shall be approximately faired into the outer contour of the pipe.

3. In any classification where cracks or washouts appear, the pipe shall be identified with a red band and considered unfit for further drilling service.

4. Average adjacent wall is determined by measuring the wall thickness on each side of the cut or gouge, adjacent to the deepest penetration.


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2-7/8 in., 10.40#/ft., 0.362 in. 73,0 mm, 15,5 kg/m, 9,19 mm

1/32 in. = 8.6% wall 1/32 in. = 1.1% OD 1/32 in. = 0,79 mm







A. OD Wear Wall





C. Slip Area Mechanical Damage

Cuts2, gouges2







(6,43 mm)

2. Cuts & Gouges


(6,43 mm)


(6,43 mm)




base of deepest pit











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Imperfections



3-1/2 in., 9.50#/ft., 0.254 in. 88,9 mm, 14,1 kg/m, 6,45 mm

1/32 in. = 12.2% wall 1/32 in. = 0.89% OD 1/32 in. = 0,79 mm







A. OD Wear Wall





C. Slip Area Mechanical Damage Cuts2, gouges2







(4,52 mm)

2. Cuts & Gouges


(4,52 mm)


(4,52 mm)




base of deepest pit











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3-1/2 in., 13.30#/ft., 0.368 in. 88,9 mm, 19,8 kg/m, 9,35 mm

1/32 in. = 8.5% wall 1/32 in. = 0.89% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2





2. String Shot Not over 7/64 in. (2,67 mm) Not over 9/64 in. (3,56 mm)

E. Corrosion, Cuts, & Gouges


(6,55 mm)

2. Cuts & Gouges


(6,55 mm)


(6,55 mm)




base of deepest pit











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3-1/2 in., 15.50#/ft., 0.449 in. 88,9 mm, 23,1 kg/m, 11,40 mm

1/32 in. = 7.0% wall 1/32 in. = 0.89% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(7,98 mm)

2. Cuts & Gouges


(7,98 mm)


(7,98 mm)




base of deepest pit











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4 in., 14.00#/ft., 0.330 in. 101,6 mm, 20,8 kg/m, 8,38 mm

1/32 in. = 9.5% wall 1/32 in. = 0.78% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(5,87 mm)

2. Cuts & Gouges


(5,87 mm)


(5,87 mm)




base of deepest pit











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4-1/2 in., 13.75#/ft., 0.271 in. 114,3 mm, 20,5 kg/m, 6,88 mm

1/32 in. = 11.4% wall 1/32 in. = 0.69% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(4,83 mm)

2. Cuts & Gouges


(4,83 mm)


(4,83 mm)




base of deepest pit











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4-1/2 in., 16.60#/ft., 0.337 in. 114,3 mm, 24,7 kg/m, 8,56 mm

1/32 in. = 9.3% wall 1/32 in. = 0.69% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(6,0 mm)

2. Cuts & Gouges


(6,0 mm)


(6,0 mm)




base of deepest pit

RBW not less than 0.236 in. (6,0 mm) measured from base

of deepest pit B. Erosion & Wear Wall









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4-1/2 in., 20.00#/ft., 0.430 in. 114,3 mm, 29,8 kg/m, 10,92 mm

1/32 in. = 7.3% wall 1/32 in. = 0.69% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(7,65 mm)

2. Cuts & Gouges


(7,65 mm)


(7,65 mm)




base of deepest pit











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5 in., 16.25#/ft., 0.296 in. 127,0 mm, 24,2 kg/m, 7,52 mm

1/32 in. = 10.5% wall 1/32 in. = 0.62% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(6.02 mm)

2. Cuts & Gouges


(6.02 mm)


(6.02 mm)




base of deepest pit

RBW not less than 0.207 in. (6.02 mm) measured from



Not less than 0.207 in. (6.02 mm)







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Table 7.2.3 - 11 - Classification of Used Drill Pipe: 5 in., 19.50#/ft., 0.362 in.

5 in., 19.50#/ft., 0.362 in. 127,0 mm, 29,0 kg/m, 9,19 mm

1/32 in. = 8.6% wall 1/32 in. = 0.62% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(6,43 mm)

2. Cuts & Gouges


(6,43 mm)


(6,43 mm)




base of deepest pit











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Table 7.2.3 - 12 - Classification of Used Drill Pipe: 5 in., 25.60#/ft., 0.500 in.

5 in., 25.60#/ft., 0.500 in. 127,0 mm, 38,1 kg/m, 12,70 mm

1/32 in. = 6.2% wall 1/32 in. = 0.62% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(8,90 mm)

2. Cuts & Gouges


(8,90 mm)


(8,90 mm)




base of deepest pit











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5-1/2 in., 21.90#/ft., 0.361 in. 139,7 mm, 32,6 kg/m, 9,17 mm

1/32 in. = 8.6% wall 1/32 in. = 0.56% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(6,43 mm)

2. Cuts & Gouges


(6,43 mm)


(6,43 mm)




base of deepest pit











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5-1/2 in., 24.70#/ft., 0.415 in. 139,7 mm, 36,8 kg/m, 10,54 mm

1/32 in. = 7.5% wall 1/32 in. = 0.56% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(7,39 mm)

2. Cuts & Gouges


(7,39 mm)


(7,39 mm)




base of deepest pit











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5-7/8 in., 23.40#/ft., 0.361 in. 149,2 mm, 34,8 kg/m, 9,17 mm

1/32 in. = 8.6% wall 1/32 in. = 0.53% OD 1/32 in. = 0,79 mm







A. OD Wear Wall






Cuts2, gouges2







(6,43 mm)

2. Cuts & Gouges


(6,43 mm)


(6,43 mm)




base of deepest pit











SOP No. III-002



Imperfections

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SOP III-002 R00

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