Mt Procedure Mab Amab p Qc 04 Rev.01

8/19/2019 Mt Procedure Mab Amab p Qc 04 Rev.01

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Document No. : INS/ASME/MT/001 Rev.: 17 dated 21.11.2015 Page No.: 1 of 17

This document is a property of INSPEC and for use by its authorized personnel only. Use of this Procedure by non-INSPEC

Organizations is by specific agreement. This document is subject for revisions and only the latest revision stands current.

Approved Master Copy of this document is filed and stored under the custody of INSPEC Technical manager. This document

shall not be reproduced without the written consent of INSPEC. Controlled Distribution Copy Holders will receive current

versions

INTERNATIONAL INSPECTION SERVICES LTD

Document No. : INS/ASME/MT/001

Rev: 17 Date: 21.11.2015 Page: 1 of 17

OPERATION CONTROLS - PROCEDURE

MAGNETIC PARTICLE EXAMINATION

PROCEDURE


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Approved Master Copy of this document is filed and stored under the custody of INSPEC Technical manager. This document shall

not be reproduced without the written consent of INSPEC. Controlled Distribution Copy Holders will receive current versions



PROCEDURE

REVISION CONTROL

Revision Number &

DateChanges Remarks

00

15 February 2003New Issue

Issued to address requirements of ASME Section V Edition

2001 Addenda 2003

01

15 February 2005Sec 5.2, 6.2, 7.2, 10.1, 10.2

Issued to address requirements of ASME Section V Edition

2004

02

13 September 2005Sec. 8.1, 10.1, 11.5, 18.1 -

03

25 January 2006

Sec 1.1

Sec 1.5Sec 2.1

Sec 4.2

Sec 17.1

Annexure II

Revised

AddedRevised & ASME Sec V addenda 2005 added

Added

Revised

Revised

04

18 February 2007

Sec 1.2 Revised

Sec 2.1 Revised

Sec 12.1.1 Revised

Addenda 2006 incorporated.

05

10th September 2007

Sec 1.2: Revised.

Sec 3.4: Fully revised. Table 3.1 added.

2007 edition incorporated.

06

14th

February 2008

Sec 14.3.1: Revised.

Sec 14.3.2: Added.

Comments and interpretations.

07

3rd

January 2009

Sec 1.2: Revised.

Sec 2: Revised

Sec 3.5: Revised.

Sec 14.3.3: Newly added.

Sec 17.1: Fully revised.

2008 Addenda incorporated.

08

16th

February 2009

Appendix-I: Revised. ASME Sec VIII Div 2 requirements incorporated.

09

20th

December 2009

Sec 2 and 5.1 revised.

Sec 5.2: Newly added. Subsequent

paragraphs re-numbered.

Sec 8.4: Newly added.

Sec 14.3.3: Revised.

Report format revised.

2009 edition incorporated.

10

8th

June 2010

Para 1.6: newly added.

Para 7.1: revised.

Para 10.1: revised.

AC yokes power supply (110V or 230V) requirements

added.


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Revision Number &

Date

Changes Remarks

11

21st December 2010

Sec 1.2 Revised

Sec 2 Revised latest editions

Sec 3.1 Revised

Sec Table 3.1 Revised

Sec 4 Revised

Sec 9.4 Revised

Sec 11.1 Revised

Sec 11.3 & 11.4 Revised

Sec 14.3 Revised

Sec 14.3.4 & 14.3.5 Revised

Sec 15.2 RevisedSec 17 Revised

Report Format Revised

ASME Codes Edition 2010 incorporated

12

04.12.2011

Para 2.1: Revised.

Para 5.1: Revised.

Table 8.1: Revised.

Annexure – I: Revised.

Addenda 2011a incorporated.

ASME BPV Code Sec XII added.

13

11.03.2012

Para 1.4: Newly added. Subsequent

paragraphs renumbered.

Comments incorporated.

14

12.08.2013

Para 1.4: Revised.

Para 2.0: revised.

Para 3.5; 3.6 & 3.7, 3.9: revised.

Para 4.0: revised.

Requirements of ASME BPV Code: 2013 incorporated.

15

09.12.2013

Para 1.4, 3.5.1 & 3.9: revised.Para 5.1: newly added.

Previous para 5.1: Revised and renamed as

5.2.

Para 5.5: deleted.

Comments incorpated.

16

20.09.2015

Sec 2.1.7 revised

Annexure-II Revised

General Comments incorpated.

17

21.11.2015

Sec 2 revised

Para 3.4 ,3.5 revised; Deleted Paras 3.5 & 3.7

Para 6.2 revised

Sec 7 revised

Table 8.1 revised

Para 10.3,10.4,10.5: Newly added

Para 11.6 revised

Para 14.2 revised

Requirements of ASME BPV Code: 2015 incorporated.


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PROCEDURE

INDEX

Clause

Ref...Description of Content Page Ref.

1 Scope 5

2 Reference Documents 5

3 Procedure Qualification & Revision 5

4 Performance Demonstration 7

5 Personnel Qualification 7

6 NDE Method Technique 8

7 Test Equipment 88 Test Materials 8

9 Surface Condition and Preparation 9

10 QC of Test Equipment 9

11 Examination 10

12 Contrast Enhancement 11

13 Test Temperature 11

14 Viewing Conditions 11

15 Interpretation of Indications 12

16 Evaluation for Acceptance 13

17 Documentation and Reporting of Results 13

18 Final Cleaning 14

19 Demagnetizing 14

20 Safety 14

ANNEXURE

Annexure I - Acceptance Criteria 16

Annexure II - Report Format 17

Procedure Demonstration Records

Light intensity demonstration record in accordance Para 14.3.3

Attached.

Attached.


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1. Scope:

1.1 This Non-destructive Examination Procedure details the minimum requirements for conducting

Magnetic Particle Examination by AC Electromagnet or Permanent Magnet with the application of non-

fluorescent particles on the test surface.

1.2 This Magnetic Particle Examination procedure shall be applied for detecting discontinuities, which are

on the surfaces of ferromagnetic materials (including but not limited to wrought/cast products and

welds).

1.3 The extent of examination shall be as per applicable construction-Code requirements / project

specifications and client directives.1.4 Prior to application, this procedure shall be demonstrated satisfactorily to the Authorized Inspector and

under the supervision of NDT Level III considering all the essential variables as described in table 3.1

and certified by the manufacturer to be in accordance with Article T – 150 of ASME BPV Code Section

V.

1.5 Typical types of discontinuities that can be detected by this method are cracks, laps, seams, cold shuts,

and laminations.

1.6 This procedure may be applicable to other MPI methods/ techniques subject to satisfactory demonstration

for qualification and revision of the procedure.

1.7 AC yokes of 110 Volt shall be used only on an 110V AC power supply and AC yokes of 230 Volts shall

be used only on a 230 volt power supply.

2. Reference Documents:

2.1 The following documents are referred:

2.1.1 ASME Section V 2015 edition.

2.1.2 ASME Section VIII Division 1& 2; 2015 edition.

2.1.3 ASME Section I: 2015 edition.

2.1.4 ASME B31.1 2014 Edition.

2.1.5 ASME Section XII: 2015 edition.

2.1.6 ASNT SNT TC 1A 2006 edition.

2.1.7 INSPEC Written Practice INS/SNT/WP/001 Rev. 00.

3. Procedure qualification & Revision:

3.1 This Procedure is a General NDE document for reference and use by authorized INSPEC personnel

applicable for the purpose identified in the Scope and essentially addressing the requirements of ASME

Section V.

3.2 Relevant INSPEC personnel are required to be aware of the requirements of this Procedure and suitably


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qualified and certified by INSPEC for implementation.

3.3 When used by non-INSPEC Organizations, the necessary agreements will need to be effected with

INSPEC and a reference to this Procedure shall be made appropriately by the Organizations.

3.4 When required by the referencing Code Sections or any other referencing Codes, this procedure shall be

demonstrated to the satisfaction of the Inspector (s) and/or manufacturer’s representative taking into

consideration all the essential & non essential variables listed in table 3.1. When procedure

qualification is required by any of the Referencing Code sections, this procedure shall be demonstrated

and qualified with respect to all the essential and non essential variables listed in the table 3.1. In such

case, any change or deviation to essential variables will require re-qualification of this procedure.

However, any change in either essential or non-essential variables shall require revision or at least an

addendum/ supplement to this procedure.3.5 A procedure demonstration record specifying the essential variables actually demonstrated with the

essential variables permitted to use in conjuction of this procedure shall be attached as a supplement to

this procedure for a better understanding of the implementation of this procedure.

TABLE – 3.1

Requirements Essential

variable

Non-essential

variable

Clause

ref.

Magnetizing technique X 6.0

Magnetizing current type or amperage outside range specified by

Article 7 of ASME Sec V: 2013 edition or as previously

qualified

X 7.1

Surface preparation X 9.0

Magnetic Particles (fluorescent/ visible, color, particle size,

wet/dry etc.)

X 8.0

Method of Particle application X 11.3

Method of excess particle removal X 11.4

Minimum light intensity X 14.0

Existing coatings, greater than the thickness demonstrated X 9.4

Non-Magnetic surface contrast enhancement, when utilized X 12.0

Performance demonstration, when required X 4.0

Examination part surface temperature outside of the temperaturerange recommended by manufacturer of the particles or as

previously qualified.

X 13.0

Shape or size of the examination object X 1.2

Equipment of the same type. X 7.0

Temperature (within those specified by manufacture or as

previously qualified).

X 13.0


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Demagnetizing technique X 19.0

Post examination cleaning technique X 18.0

Personnel Qualification requirements X 5.0

4. Performance Demonstration:

4.1 When required by referencing Code Section, performance demonstration shall be carried out to verify the

ability of the examiner to apply the examination procedure and shall be documented.All personnel

involved in performance demonstration shall be at least Level II in magnetic particle test method (refer

Para 5.0).

4.2 In case the documentation requirements of personnel qualification and performance demonstration is not

specified by the referencing code sections, the following information shall be recorded as a minimum:4.2.1 Name of the organization i. e. INSPEC

4.2.2 Examination method applied.

4.2.3 Procedure number or designation.

4.2.4 Number and date of most recent revision.

4.2.5 Date of the demonstration.

4.2.6 Name and/or identity and certification level of the personnel performing demonstration.

5. Personnel Qualification:

5.1. All personnel conducting Magnetic Particle Examinations using this Procedure shall be competent in thetechniques of the magnetic particle examination method for which he is certified, including making the

examination and interpreting and evaluating the results, except that where the examination methodconsists of more than one operation, he may be certified as being qualified only for one or more of these

operations.

OR those personnel may be qualified to a minimum of Level II in accordance with INSPEC written

practice for the applicable technique.

5.2. As defined in the Written Practice, a person certified in accordance with the older version of the written

practice shall remain certified until the next scheduled recertification. Recertification shall be based on

Written Practice which refers to current code approved edition of SNT-TC-1A. Recertification may be

based on evidence of continued satisfactory performance or reexamination in full or part as per the

Written Practice.

5.3. Personnel conducting Magnetic Particle Examination shall have vision, with correction if necessary, to

enable to read Jaeger Type No. 2 Standard Chart at a distance of not less than 300mm, and is capable ofdistinguishing and differentiating contrast between colors or shades of gray used. Vision tests shall be

conducted annually and be current during examination.

5.4. Where required by a specific Code, existing Personnel Qualification shall be verified for applicability asto the Code conditions.

5.5. Personnel conducting Magnetic Particle Examination should be aware of the safe-practice requirementsduring examination. (Refer 20.)


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6. NDE Method Technique:

6.1. Wet Continuous Color Contrast Magnetic Particle Examination using AC ElectromagneticYokemagnetization technique.

6.2. Wet Continuous Color Contrast Magnetic Particle Examination using Permanent Magnet or

DC/HWDC Electromagnetic Yoke magnetization technique.

7. Test Equipment

7.1. Alternating Current electromagnetic yoke (110VAC or 220VAC) with adjustable poles shall be used.

The maximum pole spacing shall not exceed that is used during lifting capacity test with 4.5 Kg steel

block.

7.2. Permanent magnetic Yoke or DC/ HWDC Electromagnetic Yoke with adjustable poles shall be used.

The maximum pole spacing shall not exceed that is used during lifting capacity test with 18 Kg steel

block.

7.3. The equipment essentially produces longitudinal magnetization in the component tested.

7.4 The following types of equipment or any equivalent can be used:Table 7.1

Type Current Model Manufacturer

Permanent magnet NA PY-1 EEC; India

WM-5LT INCOR

ELYMAG-1 ELY

PM-2000 & 2004 Gammatec

YM-5 Magnaflux

DC/HWDC Yoke DC or HWDC WC-8 Western Instruments

Y-7 or Y-8 Magnaflux

AC Yoke AC (110 & 220 Volts) MY-II GammatecY-6 Magnaflux

8. Test Materials:

8.1. Test materials as defined in Table 8.1 are used during the examination


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Table 8.1

Material Brand Manufacturer

Black Ink (Magnetic Ink)

Non-Magnetic surface Contrast enhancement

7 HF

WCP-2

Magnaflux



Supramor 4

WCP 712Chemetall



MR 76

MR 72

MRChemie



Magna Ink – BK

WC - 23

Pradeep Metal Treatment

Chemicals

8.2. Test materials will be in ready-mix aerosol containers8.3. Intermixing of test materials from different Groups is not permitted.8.4. This procedure is valid for only those family or group of materials as listed in the above table 8.1, for

which a satisfactory demonstration has been carried out and documented. Refer to procedure

demonstration records for details.

9. Surface condition & preparation:

9.1. Satisfactory results are usually obtained when the surface of the component is as rolled, as-welded, as-cast or as-forged condition. Surface preparation may be necessary by grinding, machining or othermethods where surface irregularities could mask indications.

9.2. Prior to magnetic particle examination all areas to be examined and all adjacent areas within in at least25 mm shall be dry and free of all dirt, grease, lint, scale, welding flux or slag or spatter, paint, oil or

other extraneous matter that could interfere with the examination

9.3. Cleaning may be accomplished using detergents, organic solvents, de-scaling solutions, paint removers,sand or grit blasting.

9.4. In case of any non-magnetic coating that already exists on the examination surface, the coating shall beremoved by suitable removers. When this is not possible, it shall be demonstrated that effective

magnetic particle testing can be done on the maximum coating thickness on the test surface. If AC yokes

are used, the demonstration shall be in accordance with ASME Sec V 2013, Article – 7, Mandatoryappendix – I.

10. QC of Test Equipment:

10.1. The magnetizing power of all the yokes shall be verified prior to use each day the yoke is used. Also,the magnetizing power of yokes shall be verified whenever the yoke has been damaged or repaired.


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10.2. Each AC electromagnetic yokes shall be checked for its lifting power of at least 4.5 kgs at the maximumpole spacing that will be used on the actual job.

10.3. Each DC/HWDC electromagnetic yokes or Permanent magnets shall be checked for its lifting power ofat least 18 kgs at the maximum pole spacing that will be used on the actual job.

10.4. Each weigth block shall be weighted with a scale from a reputed manufacturer and stencilled with the

applicable nominal weight prior to first use. Verification of weight is not required unless the weight is

found to be damaged in a manner that caused potential loss of material.

10.5. Weighted blocks of 4.5 and 18 kgs purchased from outside with clearly marked weights along with

calibration certificates may be used as an alternative to 10.4.

11. Examination:

11.1. Prior to start of magnetic particle examination, all surfaces to be examined shall be checked to find andlocate any open to surface discontinuity which may not attract and hold magnetic particles because of

their width.

11.2. The test surface shall be magnetized using the yoke. Magnetizing shall be done in such a way that acomplete coverage of the test area is done and discontinuities of all probable orientation can be

detected. This can be accomplished by at least two separate examinations on each area producing

approximately perpendicular directions of magnetic lines. (Turn the yoke by 90º alternately).

11.3. The magnetic ink (Refer Para 8.0; Table 8.1) shall be applied to the test area by uniform spraying withthe aid of Aerosol Spray Cans and can be applied before and/or after the magnetizing current is applied.

Wet particles can also be applied when the current is on (i.e. whenever the magnetizing force is

applied); however care shall be exercised to ensure that the magnetic ink is not applied directly to the

examination surface and are allowed to flow freely over the examination surface. If the particles are

applied directly over the surface while the current or magnetization is on, the particles shall be applied

with very low velocities insufficient to remove accumulated particles. Care shall also be exercised to

avoid excess application of magnetic ink, particularly in low areas since it might lead to accumulation

and build up of particles in low areas and near the legs and thus impose difficulty in interpretation..

11.4. Removal of excess particles is generally not required for wet particles. However, in some instanceswhere excess particles might build up during examination may be accomplished by very light air streamfrom a bulb or syringe taking care that no areas having fine indications have been affected.

11.5. Indications will be revealed by retention of magnetic particles.

11.6. For weld examinations, yoke legs should be positioned on either side of weld axis (transverse) and


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spacing shall not exceed the spacing used during the lifting-power test.

11.7. The examination shall proceed with a minimum of 10% overlap on each progressive area tested.

12. Non-Magnetic Surface Contrast enhancement:

12.1. To enhance particle contrast with the test surface, a uniform thin spray of white contrast enhancementmay be applied (Refer Table 8.1) before start of magnetizing and allowed to have normal evaporation

resulting in a uniform white background.

12.1.1. Such coating should be applied only on uncoated surfaces as required only in amounts

sufficient to enhance particle contrast. When non-magnetic surface contrast enhancement isused, it shall be demonstrated that the indications can still be detected through the coating.

Thickness of coating may be measured with a coating thickness gauge but it is not essential.

12.2. When such enhancement is applied on coated surfaces, it must be demonstrated that indications todesired level can still be achieved through enhancement coating.

13. Test temperature:

13.1. The temperature of the test surface and the magnetic ink shall not exceed 50ºC. Where themanufacturer’s recommendation is more stringent than this temperature limit, the same shall be

followed.

14. Viewing conditions:

14.1. The test area shall be adequately illuminated for proper evaluation of indications revealed on the testsurface.

14.2. A minimum light intensity of 100 fc (1000 lux) is required on the surface to be examined to ensureadequate sensitivity during the examination and evaluation of indications. The light intensity,

natural or supplemental white light source, shall be measured with a white light meter prior to the

evaluation of indications or a verified light source shall be used.

14.3. The light-source (day light or artificial), technique used and light level verification shall bedocumented one time and maintained on file.

14.3.1 A hand lamp without a focusing curvature hood, with a 100 watt/ 220 volt incandescent bulbplaced at a distance maximum 250 mm from the surface will fulfill the minimum light intensity

requirement (100 fc/ 1000Lx) on the test surface. For a 60 Watt/ 220volt incandescent bulb


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without focusing hood the maximum distance will be 180mm.

14.3.2 Alternately, a rechargeable focused torch with quartz halogen bulb (Specification 6V 25W) of 25watt/ 6 volts equipped with 6V 4AH sealed Lead acid battery placed at a distance of 1000mm

from test surface may fulfill the above requirements.

14.3.3 The light source as described in 14.3.1 & 14.3.2 above, are for example only, actual light levelmay vary depending on the background light available, focusing condition and the light source

condition. Hence, the light source, technique and light level verification shall be demonstrated on

case to case basis for each shop/ manufacturer and shall be recorded on file.

14.3.4 The light level verification shall be done by a calibrated Light Meter. The light meter shall becalibrated at least once in a year or whenever the meter has been repaired. If the light meter is not

in use for a year or more, it shall be recalibrated prior to first use.

14.3.5 Light level verification described in Para 14.3.4 is not required for regular examination, howeverthe documented light level verification as described in Para 14.3.1, 14.3.2 & 14.3.3 shall be used

as a guide for ensuring minimum light intensity of 100fc (1000Lx) at the examination surface.

14.4. Where required, the area of examination can be viewed under magnification using lenses (generallyat 5x magnification).

15. Interpretation of indications:

15.1. The evaluation of indications will be during the period when the magnetic ink is applied and thecurrent is on.

15.2. Interpretation shall identify whether an indication is false, non-relevant or relevant. Adequate proof isrequired to identify an indication as false or non-relevant. A re-examination may be carried out to

confirm the previous interpretation. Identifying the location and characteristic of a relevant indication

shall be a part of interpretation.

15.3. Indications will be revealed by retention of magnetic particles. The size of the indication is the basisfor acceptance evaluation.

15.3.1. All such indications are not necessarily imperfections, however, since excessive surfaceroughness, magnetic permeability variations (such as at the edge of heat affected zones), etc., may

produce similar indications.


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15.3.2. Broad areas of particle accumulation, which might mask indications from discontinuities, areprohibited and such areas shall be cleaned and reexamined.

15.4. Relevant indications are those indications, which have any dimension greater than 1/16 in. (1.5mm).

15.4.1. Linear indication is one having a length greater than three times the width.15.4.2. Rounded indication is one of circular or elliptical shape with length equal to or less than three

times the width.15.4.3. Any questionable or doubtful indications shall be explored by visual or other means, and if

necessary, evaluated by a re-examination

16. Evaluation for Acceptance:

16.1. All relevant (including non-relevant or non-rejectable, if necessitated by any referencing documentor client requirement) indications (type of indication – linear or rounded, location, length or

diameter or aligned) shall be recorded as a minimum and interpreted against the relevant acceptance

criteria. Where none specified, all the relevant indications shall be recorded.

16.2. This Procedure contains sample acceptance standards as per ASME Section VIII Division I andDivision 2 (Refer Annexure I)

16.3. Acceptance criteria used shall be documented in the NDE Report (refer Annexure-II).

17. Documentation & Reporting of Results

17.1. For each Magnetic Particle Examination as per this Procedure, the following minimum informationshall be recorded and suitably addressed in the relevant INSPEC Report (Refer Annexure II):

17.1.1. Client / Project / Job details17.1.2. Location17.1.3. Material & thickness17.1.4. Surface Condition17.1.5. Procedure Identification & Revision.17.1.6. Method of initial cleaning*17.1.7. Test Method / Technique


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17.1.8. Equipment & current type.17.1.9. Test Temperature.17.1.10. Lighting equipment17.1.11. Lifting Power Check17.1.12. Magnetic Field strength (if required).17.1.13. MPI Materials’ Group & Batch Ref.17.1.14. Post-examination cleaning*17.1.15. Examination personnel & qualification level17.1.16. Accept / Reject status (as appropriate & applicable)17.1.17. Examination date.

17.1.18. Map or Record of indications (attach as appropriate)***: Optional information and may be included in the report or attached separately.

**: See Para 16.1.

18. Final cleaning:

18.1. When post examination cleaning is required it shall be conducted as soon as practical by using aprocess that does not adversely affect the part.

19. Demagnetizing:

19.1. Demagnetizing, if required, shall be done on the following conditions:

19.2. Prior to testing, if the material contains strong remnant magnetic fields from some previous operationor inspection.

19.3. On completion of Examination, if any existing remnant field could interfere with the removal ofmagnetic particle while cleaning the part or when necessitated by the component requirement post-

examination.

20. Safety:

20.1. All inspection personnel shall be responsible for compliance with applicable safety rules in the use ofTest materials.

20.2. Test materials are highly volatile, relatively toxic and the liquids may cause skin irritation. Useadequate ventilation at all times and avoid prolonged skin contact.

20.3. Test materials shall never be heated above the recommended temperature limits prescribed by themanufacturer.


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20.4. Test materials shall never be exposed to open flames

20.5. Keep aerosol cans containing Test materials out of direct sunlight and storage areas in excess of therecommended temperature limits specified by manufacturer; an excessive heat may cause aerosol

cans to explode.

20.6. The test system has electrical input for the Test equipment and safe practices should be followed toavoid any electrical shocks.


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ANNEXURE IASME Section VIII Div 1 Appendix 6 & ASME Section VIII Div 2 Para 7.5.6.2 & ASME Sec XII : Mandatory Appendix V:

Terminology:

a. Relevant Indications – indications with major dimensions greater than 1.5 mm (1/16 in)b. Linear Indication – an indication having a length greater than three times the widthc. Rounded Indication – an indication or circular or elliptical shape with the length equal to less than three times the width

d. Any questionable or doubtful indications shall be explored by visual or other means, and if necessary, evaluated by a re-examination

Acceptance Standard:

All surfaces to be examined shall be free of:

a. Relevant linear indications

b. Relevant rounded indications greater than 5 mm (3/16 in.)c. Four or more relevant rounded indications in a line separated by 1.5 mm (1/16 in.) or less edge-to-edge.

Crack like indications detected, irrespective of surface conditions, are unacceptable.

ASME B 31.1: POWER PIPING

Terminology:

a. Relevant Indications – Those indications which result from mechanical discontinuities with major dimensions greaterthan 2 mm (1/16 in)

b. Linear Indication – an indication having a length greater than three times the widthc. Rounded Indication – an indication or circular or elliptical shape with the length equal to less than three times the width

Acceptance Standard:

All surfaces to be examined shall be free of:

a. Any Cracks or linear indications.b. Rounded indications with dimensions greater than 5 mm (3/16 in.).c. Four or more rounded indications in a line separated by 2 mm (1/16 in.) or less edge-to-edge.d. Ten or more rounded indications in any 3870 mm2 (6 sq. in.) of surface with the major dimension of this area not to

exceed 150mm (6 in.) with the area taken in the most unfavorable location relative to the indications being evaluated.

ASME Sec I: Power Boilers: Appendix A-260

Evaluation of Indication: Indications will be revealed by retention of magnetic particles. All such indications are not necessarily

imperfections, however, since excessive surface roughness, magnetic permeability variations (such as at the edge of heat affected

zones), etc., may produce similar indications.

An indication of an imperfection may be larger than the imperfection that causes it; however, the size of the indication is the basis

for acceptance evaluation. Only indications that have any dimension greater than 1/16 in. (1.5 mm) shall be considered relevant.

(a) A linear indication is one having a length greater than three times the width.

(b) A rounded indication is one of circular or elliptical shape with a length equal to or less than three times its width.(c) Any questionable or doubtful indications shall be reexamined to determine whether or not they are relevant.

Acceptance Standard:All surfaces to be examined shall be free of

(a) Relevant linear indications(b) Relevant rounded indications greater than 3 / 16 in. (5 mm)

(c) Four or more relevant rounded indications in a line separated by 1 / 16 in. (1.5 mm) or less, edge to edge


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Mt Procedure Mab Amab p Qc 04 Rev.01

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