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NDT PROCEDUREProcedure No. : TTA/NDT/MPI-001

Rev No. : 0

MAGNETIC PARTICLE TESTING PROCEDURE

Issued date : 10/08/2010

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Project : NHON TRACH II POWER PLANT

Location : NHON TRACH DONG NAI PROVINCE

MAGNETIC PARTICLE TESTING PROCEDURE(ASME Standard)

2

1

0 10/08/2010

For Approval

M.V. SON T.M.TIEN T.A.KHANH

Prepared by Checked by Approved by Review by Approved by

Rev. Date Description TTA COMPANY CLIENT

Document No.: TTA/NDT/MPI-001

TTA/NDT/MPI-001 Issued date:10/08/2010 Rev: 0 Page 1 of 15


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11 pages including coversheet

CHANGE RECORDS (In one revision)

Rev. Date Change content

CONTENTS

Section Content Page1. Introduction 3

2. Scope 3

3. References 3

4. Qualification of personnel 3

5. Examination medium 3

6. Method of examination and magnetization technique 4

7. Surface condition 4

8. Calibration 5

9. Examination 6

10. Interpretation 6

11. Evaluation 7

12. Demagnetization 7

13. Post inspection cleaning 7

14. Acceptance criteria 8

15. HSE requirements 8

16. Examination Records 8



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INTRODUCTION This procedure is developed to cover the general requirements for Magnetic Particle

Testing services provided and carried out by T.T.Asia Co., Ltd.

1. SCOPE

This procedure defines the conditions of performing the Magnetic Particle examination for internal and external Piping of Nhon Trach II Power Plant Project.

This procedure which applies to detect cracks and other discontinuities on surfaces of ferromagnetic materials.

3. REFERENCES

ASME Section V -2007 - Nondestructive Examination NDE.

ASTM - E709-95

ASME B31.1 – 2001 for Power Piping.

ASME Section I – 2007 Rules for Construction of Power Boilers.

ASME Section VIII -2007

ASME B31.3/ASME B31.8 - 2004 ASNT Recommended Practice for Personnel Qualification and Certification in Non-

Destructive Testing No STC-TC-1A 2006.

4. QUALIFICATION OF PERSONNEL

Personnel performing the Examination shall be qualified and certified in accordance with ASNT Recommended Practice for Personnel Qualification and Certification in Non-Destructive Testing No. SNT-TC-1A-2006

5. EXAMINATION MEDIUM

Examination medium used in this procedure shall not adversely affect the integrity of the part examined and shall be Wet Visible Black Magnetic Particles (non fluorescent)

Dry and wet particles, including wet particle suspension vehicles, and particle concentrations shall be in accordance with ASTM E 709-95

Particles shall be used within the temperature range limitations set by the manufacture and the applicable specification. The temperature of the part surface and of the suspension shall not exceed 570Ċ (135°F)

Generally, Wet Visible Black Magnetic Particles shall be use for examination, brand of contrast pain/magnetic particles should be:



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- Contrast paint: NABAKEM SM -15 or equivalent

- Magnetic particles: NABAKEM MP-35 or equivalent

All consumable must meet the requirements of ASTM E 709. They must all be of the same manufacturer.

6. METHOD OF EXAMINATION AND MAGNETIZATION TECHNIQUE

Examination shall be done by the continuous method; that is, the magnetizing current remains on while the examination medium is being applied and while excess of the examination medium is being removed.

Alternative or direct current electromagnetic yokes, shall be used as a magnetizing force.

Continuous method reference to part 9.2 of this procedure.

7. SURFACE CONDITION

Satisfactory results are usually obtained when the surfaces are in the as - welded conditions.

However, where surface irregularities could mask indications due to discontinuities, surface preparation by grinding or machining maybe necessary and employed.

Prior to the examination, the surface to be examined and all adjacent areas within at least 25mm shall be dry and free of all dirt, grease, lint, scale, welding flux and spatter, oil, or other extraneous matter that could interfere with the examination.

Cleaning maybe accomplished using detergents, organic solvents, descaling solutions, paint removers, vapor degreasing, sand or grit blasting, or ultrasonic cleaning methods.

If coatings are left on the part in the area being examined, it must be demonstrated that indications can be detected through the existing maximum coating thickness applied. The demonstration shall be in accordance with Appendix I of this procedure.

When coatings are applied temporarily to uncoated surfaces only in amounts sufficient to enhance particle contrast, it must be demonstrated that indications can be detected through the enhancement coating. The demonstration shall be in accordance with Appendix I of this procedure

8. CALIBRATION

The applied magnetic field shall have sufficient strength to produce satisfactory indications.



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The magnetizing power of all yokes shall be checked by their lifting power in accordance the following requirements:

Each alternating current electromagnetic yoke shall have a lifting power at least 4.5 kg at the maximum pole spacing that will be used.

Each direct current or permanent magnetic yoke shall have a lifting power at least 18.1 kg at the maximum pole spacing that will be used.

Each weight shall be weighed with a scale from a reputable manufacturer and stenciled with the applicable nominal weight prior to first use. A weight need only be verified again if damaged in a manner that could have caused potential loss of material.

Prior to use, the lifting power of electromagnetic yokes shall have been checked within the past year.

The lifting power of permanent magnetic yokes shall be checked daily prior to use. The lifting power of all yokes shall be checked whenever the yoke has been damaged

or repaired. A field strength indicator shall be used to check the adequacy or direction and

strength of the magnetizing field and shall be used by positioning the indicator on the surface to be examined. The field strength is indicated when a clearly defined line of magnetic particles form across the face of the indicator and when the magnetic particles are applied simultaneously with the magnetizing force. When a clearly defined line of particle is not formed in the desired direction, the magnetizing technique shall be changed or adjusted.



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9. EXAMINATION

9.1 Direction of magnetization At least two separate examinations shall be performed on each area. During second examination, the lines of magnetic flux shall be approximately

perpendicular to those used during the first examination.

9.2 Examination coverage All examinations shall be conducted with sufficient field overlap to ensure 100%

coverage at the required sensitivity (as described in section 8).

Whenever possible further directions of magnetization may be employed to further establish indications of low intensity.

Typical sequence of operations to inspect a weld Clean area to be tested

Apply contrast paint

Apply magnetisism to the component

Apply ferro-magnetic ink to the component during magnatising.

Iterpret the test area.

Post clean and de-magnatise if required.

10. INTERPRETATION



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With non-fluorescent particles, the examination is performed using visible light. A minimum light intensity of 100 fc (1000 Lux) is required to ensure adequate sensitivity during the examination and evaluation of indications. The light source, technique used, and light level verification is required to be demonstrated one time, documented, and maintained on file.

11. EVALUATION

All indications shall be evaluated in term of the acceptance standard of the referencing Code Section.

Discontinuities on or near the surface are indicated by retention of the examination medium. However, localized surface irregularities due to machinery marks or other surface conditions may produce false indications.

Board areas of particle accumulation, which might mask indications from discontinuities, are prohibited, an such areas shall be cleaned and re-examined.

12. DEMAGNETIZATION If residual magnetism in the part could interfere with subsequent processing or

usage, the part shall be demagnetized any time after completion of the examination.

Alternating – Current (AC) yokes shall be used for localized demagnetization by placing the poles on the surface moving them around the area, and slowly withdrawing the AC yokes while it is still energized.

Care should be exercised to ensure that the part is entirely removed from the influenced of the AC yokes before the demagnetizing force is discontinued.

13. POST INSPECTION CLEANINGPost cleaning is necessary where magnetic particle materials could interfere with subsequent processing or with service requirements. Post cleaning techniques shall be as follows:

13.1 The drying of wet particle and subsequent removal by brushing of use of compressed air.

13.2 Removal of wet particle by flushing with solvent.

13.3 Any other techniques which may be used if they do not interfere with subsequent requirements

14. ACCEPTANCE CRITERIA- Acceptance criteria is application follow ASME B31.1-2001



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*. Evaluation of indications.

- Mechanical discontinuities at the surface will be indicated by the retention of the examination medium. All indications are not necessarily defects, however certain metallurgical discontinuities and magnetic permeability variations may produce similar indications which are not relevant to the detection of unacceptable discontinuities.

- Any indication which is believed to be nonrelevant shall be reexamined to verify whether or not actual defects are present. Surface conditioning may precede the reexamination. Nonrelevant indications which would mask indications of defects are unacceptable.

- Relevant indications are those which result from unacceptable mechanical discontinuities. Linear indications are those indications in which the length is more than three time the width. Rounded indications are indications which are circular or elliptical with the length less than three times the with.

- An indication of a discontinuity may be larger than the discontinuity that causes it, however, the size of the indication and not the size of the discontinuity is the basis of acceptance or rejection.

*. Acceptance Standard. The following relevant indications are unacceptable.

- Any cracks or linear indications.

- Rounded indications with dimensions greater than 3/16 in. (5.0 mm).

- Four or more rounded indications in a line separated by 1/16 in. (2.0 mm) or less edge to edge.

Ten or more rounded indications in any 6 sq in. (3870 mm2) of surface with the major dimension of this area not to exceed 6 in. (150 mm) with the area taken in the most unfavorable location relative to the indications being evaluated.

15. HSE REQUIRMENTSTTA Company shall comply, abide and enforce on its employees any rules,

regulations and standards on health, safety and environmental protection as provided project publish manuals policies and procedures or as otherwise required by the Vietnamese Laws pertaining to Occupational Safety and Health.

16. EXAMINATION RECORDS

A magnetic Particle Examination report will be generated and will contain the following minimum information as applicable:



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a) Project or job

b) Clients

c) Date of Examination

d) Report Number

e) Detail of Item and Quantity Examined

f) Material

g) Specifications and Procedure Number

h) Temperature

i) Surface condition, Material grade and thickness

j) Cleaning Method, Welding status (after PWHT, after welding, after hydro-test..)

k) Examination medium and Equipment

l) Method and magnetization Technique

m) Results of Examination

n) Sizes. Sketch and Location of Defect

o) NDE Examiner



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MAGNETIC PARTICLES EXAMINATION REPORT

Report No. :Request No. :TTA Job code : Procedure No. : TTA/NDT/MPI-001Page : 14 of 15

Project: Client:

Acceptance Specification/Standard: Category: Working area:

MATERIAL INFORMATIONMaterial grade & thickness: Drawing No.: Welding process: Weld joint type/Pipe size:

Surface Cleaning Grinding Machining Brushing Non-magnetic coating

Welding joint status After PWHT After Hydro-test

As-forged

After welding

MAGNETIC PARTICLES INFORMATIONMagnetic particles

materialBrand Type Color Temp.

Contrast paint NABAKEM MP-35 White Ambient

Magnetic particles NABAKEM SM-15 Black Ambient

METHOD OF EXAMINATION

Examination Method Wet Dry Equipment Type/Serial no.

Magnetizing Method AC DC Demagnetization Yes No

Lifting power: Coating detail

EVALUATIONJOINT IDENTIFICATION INTERPRETATION COMMENTS Date of

Inspection RemarksID. Joint Thk

(mm) Type Length(mm) Accept Reject

SKETCH:( to show flaw location)

T.T.A Co., LtdDate: Evaluated by:

CHINH THANGDate: Signature:

Siemens:Date: Signature:

Review by CA.Date: Signature:

MAGNETIC PARTICLES EXAMINATION REPORT

Report No. :Request No. :TTA Job code : Procedure No. : TTA/NDT/MPI-001Page : 15 of 15

Project: Client:

Acceptance Specification/Standard: Category: Working area:

T.T.A Co., LtdDate: Evaluated by:

CHINH THANGDate: Signature:

Siemens:Date: Signature:

Review by CA.Date: Signature:

Mt Tta Ndt Mpi 01 Asme

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