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    H1058 Bohai Phase II

     Development SWS No. : H1058-DOC-MQC-0146 FPSO Hull Project

    COPC No.: K1-11P-SBA-Q-QMS-0000136 CONTRACT NO. BB-1119-I

    Document Description;


    Number of Status Revision Date Written by Checked by Approved by Pages

    FRC A 2005-12-8 18 Ni Yumin Zhang Xiaoda Wang Qi

Status Code:

    AFC Accepted For Construction IFA Issued For Approval AFD Accepted For Design IFC Issued For Construction AFE Accepted For Estimate IFD Issued For Design APP Approved IFU Issued For Use ASB As Built INFO Issued For Information Only BID Issued For Bid PHA HAZOP

    DEVLP Accepted For Development PHA1 HAZID

    DRAFT N/A No Revision Applied PHA2 HAZID Level 2 FCA For Client Acceptance PO Issued For Purchase FCC For Construction Comments PRELIM Preliminary FPU For Project Use REF Reference Only FRC For Review & Comments RFQ Request For Quote ICE Issued For Cost Estimate VOID Issued For Void

Revision Explanation:

The documents submitted by SWS to COPC for review and comment will bear the alphabetical

    revision labels i.e. A, B, C. Once the documents are released as “Approved for Construction” the

    label will change to numeric i.e. 0, 1, 2, etc.

     Bohai Phase II Development

    FPSO Hull Project





    4.0 NDT EXTENT





    9.0 GENERAL





    SWS No.: H1058-DOC-MQC-0146 MAGNETIC PARTICAL TESTING FOR Piping 08-Dec-2005

    COPC No.: K1-11P-SBA-Q-QMS-0000136 Rev A Page 2of 18

     Bohai Phase II Development

    FPSO Hull Project


    This procedure covers the methods, techniques and acceptance standards for Magnetic Particle Testing (MT) of piping for marine system, machinery system, marine machinery system and hydrocarbon offloading system fabrication on Bohai Phase II FPSO hull development project.


     Offshore standard DNV-OS-D101 Marine and Machinery Systems and Equipment

     ASME Section V 2004 Edition, Article 7 - Magnetic Particle Examination

     ASTM E709-95 Standard Guide for Magnetic Particle Examination


    Personnel performing the MT testing shall be qualified and certified to MT Level II or III in accordance with the requirements of SNT-TC-1A recommended practice or equivalent qualifications issued by recognized authority or organization that is approved by DNV & COPC. A register shall be provided with Names, Qualification dates, Certification Nos., Operator Nos., Expiry dates for all NDT operators including sub-contractor. COPC/DNV shall approve all NDT operators prior to work commencement. Further evaluation of the NDT operators may be required by oral, written, practical examination to the satisfaction of the COPC representative. 4.0 NDT EXTENT

    NDT shall be performed accordingly to below DNV & COPC approved procedure -

    058-DOC-MQC-0096 - Extent of piping NDT, that base on DNV-OS-D101 B500 Non

    Destructive Testing Table B4 and Piping Specification K1-11P-SAA-P-SP-0000001.

    5.0 REPORT FORM (See Attachment B)

    Magnetic Particle Testing Report


    A portable electromagnetic AC yoke with articulated legs (poles) that allow the legs to be adjusted to contact irregular surfaces or two surfaces that join at an angle shall be the standard equipment used in the detection of surface breaking defects.

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    COPC No.: K1-11P-SBA-Q-QMS-0000136 Rev A Page 3of 18

     Bohai Phase II Development

    FPSO Hull Project

Use of permanent magnets is not permitted.

AC Yoke Calibration

    AC yokes shall develop a minimum lifting power 5kg at maximum leg spread that use for testing on site.

    The lifting force test shall be performed every 3 month and recorded, it shall be also checked whenever the yoke has been damaged or repaired. A daily check should also perform prior to start and end of work to ensure it is function properly.

    Test block (weight) shall be weighed with a scale from a reputable manufacturer or equivalent and stenciled with the applicable nominal weight prior to first use.

    Refer appendix C for lifting force test report

    7.0 Examination Medium

    a) The magnetic particles used for obtaining patterns of discontinuities shall be non-toxic

    and shall provide adequate contrast with the surface being examined.

    b) The magnetic particles used for obtaining patterns of discontinuities shall be capable of

    exhibiting good visual contrast against the white backing medium.

    c) White background contrast paint shall be used with black magnetic ink particles and

    shall not corrode or otherwise adversely affect the integrity of the steel components

    being examined.

    d) Magnetic particles shall be used within the temperature range limitations set by the


    e) Dry powder Magnetic particles not suspended in liquid. Normally use for testing of

    weld excavated area that with higher test surface temperature (ie. >57?C).

    f) Wet magnetic ink Magnetic particle suspended in liquid (oil or water). Available in

    premixed or dry / paste concentrate which is require to mix by the user. The suspension

    ratio of particles will confirm to manufacturer recommendation and below test. 7.1 Magnetic Particle Quality Control Test

    Wet Particle Quality Control Test

    The following tests for wet magnetic particle suspensions should be conducted when mixing

    of magnetic particle ink (water base) ie. Paste/powder+ water.

    a) Determine Ink Concentration: Ink concentration and sometimes bath contamination are

    determined by measuring its settling volume through the use of a Test Method D 96

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     Bohai Phase II Development

    FPSO Hull Project

    pear-shaped centrifuge tube with a 1.5-mL stem(0.1-mL division) for nonfluorescent

    suspensions. Before sampling, the new batch (bottle) shall be shake and mix well. Take

    a 100-mL portion of the suspension from the bottle and allow it to settle for

    approximately 30min with water-based suspensions before reading. The volume settling

    out at the bottom of the tube is indicative of the particle concentration in the bath. b) Sample Interpretation: If the bath concentration is low in particle content, add a sufficient

    amount of particle materials to obtain the desired concentration; if the suspension is

    high in particle content, add sufficient vehicle to obtain the desired concentration. If the

    settled particles appear to be loose agglomerates rather then a solid layer, take a

    second sample. If still agglomerated, the particles may have become magnetized’

    replace the suspension.

    c) Settling Volumes: for nonfluorescent the recommended settling volume is from 1.2 to 2.4

    mL per100 mL of vehicle, unless otherwise specified by the particle manufacturer. d) Refer Appendix D for test report.

    e) No test is required for magnetic ink (oil base) that premixes at the factory and contained

    in aerosol can.

    Dry Particle Quality Control Tests

    a) In order to assure uniform and consistent performance from the dry magnetic powder

    selected for use, it is advisable that all incoming powders be certified or tested for

    conformance with quality control standards established between the user and supplier.


    The A.C. Yoke or prods method shall be used to induce the required magnetic fields.

    Use of permanent magnet is not permitted.

    1) Temperature during test

    Wet method magnetic particle examination shall not be performed if the surface temperature of the part exceeds 57;C and antifreeze shall be added into magnetic particle water base ink whenever test surface temperature ? 4ºC or as recommended by manufacturer.

    2) Surface Preparation

    a) The surface finish of the welds or the weld grooves shall be such that proper

    interpretation can be accomplished. The surface to be examined may be examined in

    the as-welded or as-rolled condition. However, surface irregularities that could mask

    indications of unacceptable discontinuities shall be removed by grinding, power

    brushing, wire brushing or other Client approved methods.

    b) Prior to the examination, the surface to be examined, including 25mm on each side of

    the weld or weld groove, shall be dry and free of any dirt, grease, lint, scale, welding flux SWS No.: H1058-DOC-MQC-0146 MAGNETIC PARTICAL TESTING FOR Piping 08-Dec-2005

    COPC No.: K1-11P-SBA-Q-QMS-0000136 Rev A Page 5of 18

     Bohai Phase II Development

    FPSO Hull Project

    and spatter, oil or other extraneous matter that could interfere with the examination. For

    weld excavated area, the groove shall be ground to bright metal prior to testing.

     3) Application of Examination Medium

    a) Adequate contrast with the background of the surface being examined shall be made

    using white contrast paint.

    b) White contrast paint shall be applied in a spray of a uniform layer on the surface being

    examined, dry film thickness shall be approximately 25-microns (0.0010-mils), but shall

    not exceed 50-microns (0.0020-mils).

    c) Wet magnetic particles shall be applied onto the surface of interest.

    4) Magnetization

    a) Continuous Magnetizing Method

    ; The magnetizing current shall be switched on during the period the magnetic

    particles are being applied.

    ; The duration of the magnetizing current shall be long enough in order that magnetic

    particle can be flowed/gathered in order to form an indication on discontinuities

    surface/flux leakage area, typically 5 second. The current only to be cut off after the

    magnetic ink flow ceases and evaluation/interpretation of indication is completed.

    ; Visual light shall be provided when performing MT inspection. The light shall

    provide minimum intensity of 1000 Lux. Calibrated light meter shall be use to verify

    the light intensity when necessary.

b) Direction of Magnetization

    At least two separate examinations shall be performed on each area. During the second

    examination, the lines of magnetic flux shall be approximately perpendicular to those

    used during the first examination. When indications are detected, the indications shall

    be closely examined with the magnetic field perpendicular to the indications. The Yoke

    spacing shall be 75 to 150 mm. maximum, adjusted to suit the configuration of the

    examined area and shall provide 100% examination.

    All examinations shall be conducted with sufficient overlap, 10% normally.

    5) Magnetizing Field Adequacy

    a) To verify the adequacy or direction of the magnetizing field, the Magnetic Particle Field

    Indicator shall be used by positioning the indicator on the surface to the examined with a

    suitable distance (i.e. a few inches) away to determine the adequacy or field coverage in

    one test.

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     Bohai Phase II Development

    FPSO Hull Project

    b) Adequate sensitivity is demonstrated for that particular yoke/prods spacing when a

    clearly defined line of magnetic particles forms across the copper face of the indicator,

    when the magnetic particles are applied simultaneously with the magnetizing force.

    c) When a clearly defined line of particles is not formed, or is not formed in the desired

    direction, the magnetizing technique shall be changed or adjusted.

    6) Interpretation and Evaluation Of Indications

    Relevant MT indications results when magnetic flux leakage fields formed by

    discontinuities attracts and holds magnetic particles. Other MT indications caused by

    particles held by nonmagnetic forces or weak leakage fields from weld geometry or

    permeability changes are termed false indications.

     Testing personnel should properly evaluate indications by the following:

    a) Re-evaluation of the indication by retesting with the yoke/prods field perpendicular to

    the discontinuity indication if it is not already perpendicular.

    b) Retesting and ensuring that excess particles are removed. If the suspect indication is

    removed during the retest, the indication is interpreted as not relevant, or as a false indication.

    Typically relevant indications retain particles after all excess particles have been removed

    c) If the indication has a light particle buildup and weak particle adhesion, and if doubt

    exists as to whether the indication is relevant or false, the area of the indication should

    be lightly surface-ground and retested.

    Conversely, care must be taken to ensure that relevant indications are not masked by

    non-relevant ones.

    Overlap and undercut may cause relevant surface indications. Both can cause problems

    by masking weld toe cracks by producing a light MT indication. These can be visually

    identified and light grinding is requiring on those affected area to remove the discontinuities

    that may interfere with interpretation and rerun the test.

    9.0 General

    1) All welds shall be 100% visually inspected (both sides, wherever possible) prior to carry out


    2) When heat treatment is performed, the final MT shall be carried out when all heat treatments

    have been completed.

    3) Report turn around time shall be within 2 working days. After signed by all parties, SWS to

    forward a copy of the test report to COPC & DNV.

    4) Areas for which complete inspection was not practicable shall be noted, along with the

    reason why the inspection was incomplete.

    5) SWS shall propose alternate MT technique or other NDT test method to complete the

    SWS No.: H1058-DOC-MQC-0146 MAGNETIC PARTICAL TESTING FOR Piping 08-Dec-2005

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     Bohai Phase II Development

    FPSO Hull Project

    inspection and shall be agreed with COPC & DNV.

    6) No crack or base metal repair is allowed without COPC permission.

    7) Water base MT shall be used, oil base MT is not permitted unless a degreasing technique for

    test surface is provided.

    8) After perform the test, MT operator shall indicate the test result ie. “ACC” or “REJ” beside the

    joint with operator I.D & test date. Any defect found shall be identified by mark clearly the

    location beside the weld seam for easy reference.

    9) This procedure and relevant technique applied shall be demonstrated to the satisfaction of

    the COPC Inspector and DNV on site to verify qualification of the procedure technique for the

    work to be carried out.

    10) De-magnetization should be considered in areas where residual magnetism could be

    detrimental if specified by engineering.

10.0 Acceptance Standard

    Level B of ISO 5817 Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections.

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     Bohai Phase II Development

    FPSO Hull Project

    Appendix A


     Technique No Description

     PIP/MT01 AC Yoke Wet Continuous Method

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     Bohai Phase II Development

    FPSO Hull Project






    Sheet 1 of 3

1. Material: Carbon/ferritic Steel

2. Scope: Applicable to piping included marine, machinery,

    marine machinery & hydrocarbon offloading system.

3. Extent of Detection of any surface breaking defects on welds

    Application: of piping and parent metal.

4. Inspection AC Yoke Wet Continuous


5. Consumables: Cleaner- Chuan Pai HD-BX (aerosol can) or equivalent.

    White Contrast Paint- Chuan Pai, HD-MPA(aerosol

    can)or equivqlent.

    Magnetic ink

    Water Base Magnetic paste, Nan Hu, DP (To be mixed

    with water)or equivalent.

    Oil base Chuan pai, HD-YCY (aerosol can)or


    6. Testing Wuxi Jiachen XMTY-II; Yuguan CDX-III adjustable AC

    Equipment: yoke or equivalent.

7. Magnetic Field ASME pie-shaped magnetic particle field indicator to Adequacy

    Verification: determine the direction and adequacy of magnetic field.

    8. Lifting Force Minimum 5kg weight - to check the acceptable lifting

    Test power of a alternating current electromagnetic yoke.

    Pole spacing: maximum distance that use for testing.

    9. Ink Pear-shaped centrifuge to determine the proper

    Concentration concentration of black magnetic particle powder in

    (for water base water base solution.

    only) Ink strength in 100ml liquid after approximately 30

    minutes settle time shall between 1.2 to 2.4ml.

10. Testing Surface temperature not more than 57;C and antifreeze

    Temperature: shall be added into magnetic particle water base ink

    whenever test surface temperature ? 4ºC or as

    specified by the manufacturer.

    11. Surface The surface to be examined and all adjacent areas

    Preparation: shall be dry, clean and free from scale, rust, flux,

    spatter, grease, oil, paint or any other matter that

    will interfere with proper inspection.

    SWS No.: H1058-DOC-MQC-0146 MAGNETIC PARTICAL TESTING FOR Piping 08-Dec-2005 COPC No.: K1-11P-SBA-Q-QMS-0000136 Rev A Page 10of 18

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