SAFETY ZONE
Quality System Format
ISO/IEC 17020
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 1 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
Thorough Examination Of
DYE PENETRANT TESTING
SZS®
Page 1
SAFETY ZONE
Quality System Format
ISO/IEC 17020
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 2 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
METHOD OF STATEMENT
Scope:
This Test method covers procedures for penetrant examination of butt and fillet weld with the
associated Heat Effected Zone (HAZ) on the parent metal and components. They are nondestructive testing methods for detecting discontinuities that are open to the surface such as cracks,
porosity and lack of fusion by liquid penetrant testing conducted in accordance with the
requirements of the referenced Codes and Standards.
Purpose:

To ensure magnetic particle testing is carried out in a controlled defined manner, in
accordance with the requirements of codes and standard referenced below in reference.
Abbreviations:
Abbreviations used in this document are briefly out lined below:
 DPT
– Dye penetrant testing
 LPT
- Liquid penetrant testing
 ANST – American Society of Non Destructive Testing
 ASME – American Society of Mechanical Engineers
Definition
Magnetic Particle Inspection will be carried out by the Wet continuous method.
Continuous Method
A method where in the indicating medium is applied while the Magnetic field is
present.
Permanent magnet
A magnet that retains a high degree of Magnetization virtually unchanged for a long period
of time.
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Page 2
SAFETY ZONE
Quality System Format
ISO/IEC 17020
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 3 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
Magnetic field
The volume within and surrounding either a Magnetized part or a current carrying
conductor where in a magnetic force is exerted.
Flux leakage
The Magnetic field that leaves the surface of a test specimen as a result of discontinuity
Or a change in that section.
Magnetic particles
Finely divided Ferro-magnetic material capable of being individually magnetized and
attracted to distortions in a magnetic field.
Personal Qualification
 All personnel performing Magnetic Particle Testing shall have level II certification in MT
and shall meet the training & certification requirement of SNT-TC-1A of ASNT level II or
equivalent and shall be responsible for following the examination procedures correctly and
examination report shall be prepared and signed as per approved format.
 Only individuals qualified to NDT Level II or individuals qualified to NDT Level I and
working under the supervision of an NDT Level II may perform the examinations in
accordance with this procedure.
Safety Rules
Before starting with the inspection, it is necessary to make sure of the following:
- The Inspector is equipped with PPE.
- Inspection Area should be barricaded.
Equipments & Consumables
a) Yoke (Permanent or electromagnetic)
A magnet that retains a high degree of Magnetization virtually unchanged for a
long Period of time is known as a permanent yoke.
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Page 3
Quality System Format
ISO/IEC 17020
SAFETY ZONE
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 4 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
Electromagnetic yoke generates magnetic field by virtue of electric power supply through a
Coil which is wounded over a ferritic core
b) Magnetic Particles ( Wet )
Wet particles shall have the same basic properties as dry particles, but because
they are suspended in light oil, water or other suitable and approved carrier, they can be
made of even finer powders.
Technical specifications of equipment
 Permanent Magnetic Yoke
Manufacturer
Model
Serial No
Capacity
Field strength
Pole spacing
Weight
-
Western Instruments.inc Canada,
WM 5 C
910
23 kg (50 pounds)
10900 Gauss 2 mm air gap
0-24 inch (0 – 610 mm)
0.9 kg 2 pounds
 White contrast Paint
Model
- z check wp
Temperature range - 5 -50C
 Magnetic particle spray
Model
Colour
Particle size
SZS®
- Zcheck – 9E Black
- black
- less than 20 microns
Page 4
SAFETY ZONE
Quality System Format
ISO/IEC 17020
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 5 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
General Inspection Requirements
 The permanent magnetic yoke shall be calibrated or have the calibration verification
performed not less than every 1 year .Permanent magnetic yoke must be serialized
and evidence of calibration or calibration verification must be maintained.
 When conducting visible magnetic particle inspection the minimum ambient white
(daylight, or indoor facility) light intensity at the inspection surface shall be 100 foot
candles (1076 lux), or customer-stated requirements if higher. Lighting requirements should
be met prior to the start of the inspection.
Surface Preparation
 Generally satisfactory results are usually obtained when the Surface shall be cleaned and
shall be free from all irregularities; any loose scales shall be removed for better Magnetic
Testing results. However, surface preparation shall be done by grinding or machinery will
be necessary where surface irregularities could mask indications due to discontinuities.
 Prior to all Magnetic Particles examinations, the weld to be examined and all adjacent areas
within at least 25mm (1’’) 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.
 When using black magnetic inks the surface may be given contrast enhancement by
applying a thin coating of white contrast paint.
 Surface temperature of the part should be within the range 5°C - 52° (as per ASME SEC V)
during the magnetization period, except if otherwise specified by the manufacturer.
SZS®
Page 5
SAFETY ZONE
Quality System Format
ISO/IEC 17020
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 6 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
Examination Procedure
 Surface of the weld area is to be prepared as per surface preparation procedure.
 Thorough Visual Inspection should be done prior to the magnetic particle inspection.
 The continuous magnetization technique is to be employed and ensure in all operations that
the pole faces remain in maximum contact with the surface.
 The method of magnetization shall be done using either electromagnetic yoke or permanent
magnetic yoke, with the pole spacing is to be between a minimum of 3 inches (76.2 mm) and
a maximum of 6 inches (152.4 mm). Shorter spacing may be used to compensate for the
geometric of area being examined or increase sensitivity, but leg spacing less than 3 inches
(76.2 mm) is not recommended due to the strength of the longitudinal magnetic field at the
poles.
 The yoke shall be positioned approximately 45° to the weld axis with the weld centered
between the yoke pole pieces. The second magnetization shall be conducted with the induced
magnetic field oriented approximately 90° to the first. Inspection shall progress along the weld
with each new movement indexed to the last position of the yoke poles. This progression shall
be such that each new area of inspection overlaps the previous area of inspection to ensure
100% coverage at the required sensitivity
 For the wet magnetic particle method, apply the magnetic ink onto the area under test and
allow to flow over the surface such as to allow maximum exposure of the magnetic particles
to any flux leakage present.
 For the dry magnetic powders should be applied in such a manner that a light, uniform, dust
like coating settles on the surface of the area under inspection. Excess power may be gently
blown across the surface to aid interpretation and increase exposure of magnetic particles to
any flux leakage present.
 Maintain the magnetizing field for at least two seconds after the above mentioned steps and
inspect immediately.
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Page 6
SAFETY ZONE
Quality System Format
ISO/IEC 17020
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 7 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
 Record the indications with Size, number and location of linear indications. And also Sketches
shall be made to show location.
 Unless otherwise specified, parts will be cleaned after the inspection to remove remaining
particle solution.
Evaluation Of Indications and Common Weld defects

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








Lack of fusion
Under cut
Spatter
Porosity
slag inclusion
Under fill
Incomplete fusion
Overlap
Lack of penetration
Excess concavity
Excess convexity
 An indication may be the evidence of a surface imperfection. All indications need not be
relevant.. Relevant indications are those caused by leakage flux. Relevant indications due to
unacceptable mechanical discontinuities are to be noted, located and sized.
 Any indication which is believed to be non-relevant shall be re-examined again. Only
indications having major dimension of greater than one sixteenth (1/16) of an inch shall be
considered relevant.
 A liner indication is one having a length greater than its width. A rounded indication is shape
with a length equal to or less than three times its width.
 Unacceptable indications shall be removed by chipping or grinding and shall be re-tested if
the repaired surface is free of sharp notches are corners / grinding marks. When a defect
appears to be fully removed the area can be repaired and re-examined by the same
method. Repaired area shall be blended into the surrounding surface so as to avoid sharp
notches, crevices or corners.
 If required the repaired area shall also be re-examined by suitable NDT method.
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Page 7
SAFETY ZONE
Quality System Format
ISO/IEC 17020
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 8 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
Acceptance Criteria
 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 is the evidence of a mechanical imperfection. Only indications
which have any dimension greater than 1.60 mm shall be considered relevant.
 Indications shall be determined to be relevant or non-relevant.
 Relevant indications shall be defined as an indication due to a leakage field which is caused
by an actual discontinuity in the test specimen with a dimension greater than 1/16”(1.60
mm)
 Non-relevant indications shall be defined as indications due to a leakage field which may or
may not be caused by an actual discontinuity which is (≤) 1/16”, unless otherwise stated by
the applicable code. Non-relevant indications may also be defined as false indications
caused by part geometry or some other anomaly other than a leakage field.
 Relevant rounded indications greater than 3/16 in.(5 mm)
 Four or more relevant rounded indications in a line separated by 1/16 in. (1.60 mm) or less,
edge to edge
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Page 8
SAFETY ZONE
Quality System Format
ISO/IEC 17020
METHOD STATEMENT
Reference: SZ-TP-MS-41
Revision: 0
Date: 25-01-2018
Page: Page 9 of 9
Prepared by: Ibrahim A.
Reviewed by: Haissam Mahmoud
Approved by: Haissam Mahmoud
Reporting:
A report shall be prepared detailing the results of the examination. The report shall contain
sufficient information to enable a full assessment of quality and to ensure that any non-acceptable
areas can be accurately located should repair be necessary. Any restrictions to test shall be noted.
Reference:
1.
2.
3.
4.
5.
6.
7.
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ASME Section 5 Article 7
BS EN ISO 17638:2009
ASTM E 709
ASME code section VIII, Division 1 2000 Edition
AWS D1.1
ASME B31.3 Process Piping
ASTM 1444
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