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Surface Preparation - HKIMT Sponge Jet (HKIE).pdf · Surface Preparation and Coating Division EXA GROUP LTD ©2008 Sponge-Jet Inc. ... Wet Abrasive Blasting Dry Ice Blasting Bristle

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Text of Surface Preparation - HKIMT Sponge Jet (HKIE).pdf · Surface Preparation and Coating Division EXA...

  • Surface PreparationWarners Suen

    Surface Preparation and Coating DivisionEXA GROUP LTD

  • 2008 Sponge-Jet Inc. All rights reserved.

    Surface Preparation is important?

  • 2008 Sponge-Jet Inc. All rights reserved.

    Tools For Cleaning

    Hands Tools-Wire brushes, Scrapers, Chisels, etc.

    Power Tools-Rotary wire brushes, Needle Scaler, Grinder, MBX, etc.

    Dry Grit blasting-Mineral, e.g. SiO2, Al2O3, Fe2O-Soda powder, Corn powder, Dry Ice (CO2), etc.

    Water jetting-LPWC, HPWC, HPWJ, UHPWJ-Slurry blast- Inhibitor

  • 2008 Sponge-Jet Inc. All rights reserved.

    Visible contaminant- Heavy Rust- Mill Scale- Heavy Deposits (Salts and Mineral

    Sludge)- Oil / Grease / Waxes (Petroleum

    Based)- Old Coatings

    Invisible contaminant- Soluble Salts (Chlorides, Sulphates- Acid / Alkali- Fatty Acids, Petroleum- Silicone

    Contaminant Removal

  • 2008 Sponge-Jet Inc. All rights reserved.

    Standard of Surface CleanlinessAbrasive Blasting

    Standard RandomStaining

    Cleanliness

    NACE No.1 / SSPC-SP 5 / Sa 3White Metal Blast Cleaning

    None Free of all visible oil, grease,dust, dirt, mill scale, rust,coating, oxides, corrosionproducts, and other foreignmatter

    NACE No.2 / SSPC-SP 10 / Sa 2.5Near-White Metal Blast Cleaning

    5%

    NACE No.3 / SSPC-SP 6 / Sa 2Commercial Blast Cleaning

    33%

    NACE No.4 / SSPC-SP 7 / Sa 1Brush off Blast Cleaning

    Traces of tightly adherent mill scale, rust,and coating residues are permitted toremain on 10% of each unit area

  • 2008 Sponge-Jet Inc. All rights reserved.

    Regulations

    United Nations IMO (International Marine Organization)SOLAS (Safety of Life at Sea)SOLAS Regulation 3-2 based on IMO Recommendation A

    798 of July 1, 1998 stares that ships ballast tanks shall beabrasive blasted to ISO 8501 Sa 2 (Near White Metal).

  • 2008 Sponge-Jet Inc. All rights reserved.

    Background

    Weld seams are rarely prepared properly prior to coating.

    Even if prepared properly, are normally the first location of corrosion due tosurface irregularities, stress corrosion, increased hardness and the low levelgalvanic reaction of the weld to the adjacent steel.

    US NAVY Guidelines indicate thatthe best coatings applied over powertool preparation will last a maximumof 3 years vs 20-30 years forabrasive blasted surfaces.

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    Life Cycle Costs

    Shipyards rarely have a vested interest in coating performance greaterthan 5 years in fact generally their liability ends at 1 year or less.

    In a cost model on the economics of coatings in shipsballast tanks 25 year life cycle cost were reported forvarious quality of coatings systems*.

    A common system (with 5 year expected life) wouldultimately cost $113 per square meter. A high performance system (with a 30 yearexpected life) would ultimately cost $46 per squaremeter.

    *Ref: Economics of Coatings/Corrosion Protection of Ships. Johnny Eliasson, Stolt-Nielsen Transportation Group B.V.

  • 2008 Sponge-Jet Inc. All rights reserved.

    Normal Cleaning Practices

    The reason prefer hand tools to abrasiveblasting is:

    Does not damage adjacent coating withblast media rebound.

    Can be done in close proximity to othertrades such as pipe fitters andelectricians.

    Minimal dust collection so ventilationducts are not required throughout theship.

  • 2008 Sponge-Jet Inc. All rights reserved.

    Goals of Abrasive Blasting

    Clean Rust Create Profile Dust Control Low Pressure

    Bead Blasting

    Wheel Blasting

    Hydro Blasting

    Wet AbrasiveBlasting

    Dry Ice Blasting

    Bristle Blasting

    Bead Blasting

    Wheel Blasting

    Wet AbrasiveBlasting

    Bristle Blasting

    Wet AbrasiveBlasting

    How manycan cleanthoroughly?

    How manycan profileuniformly?

    How manycan achievelower dust?

    How many canachieve highersafety?

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    What is the result?

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    SPONGE JET OVERVIEW

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    Sponge Blasting Equipment

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    Technology of Sponge Media

    Sponge Character:-Soft-Low Rebound-Absorb Dust

    Mineral Character:-Stiff-Clean adhesion underpressurized

  • 2008 Sponge-Jet Inc. All rights reserved.

    Ordinary Blasting versus Sponge Media Blasting

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    Sponge Media Advantages:Clean, dry blasting processLow dust generationLow ReboundWide range of profilesReusableNon-Sparking

    New Abrasive Blasting Technologies

  • 2008 Sponge-Jet Inc. All rights reserved.

    Applications Marine

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    Application Oil and Gas

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    How do Sponge Jet Save your Money?

    Eliminate Rework

    No need rinse or re-blast

    Less need for extensive scaffolding

    Protect sensitive equipment

    Reduce Air Management cost

    Reduce Waste Disposal cost

  • 2008 Sponge-Jet Inc. All rights reserved.

    Achievement of Sponge Blasting

    Clean Rust Create Profile Dust Control Low Pressure

    99.9%Dust free

    Up to S.A. 3White metal

    0-100 microns 3 Bars orLess

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    Blast Where You WantWhen You Want

    Call or WhatsApp me on 9203 6351

    [email protected]

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    Additional Information Emission Test

    22

  • 2008 Sponge-Jet Inc. All rights reserved.

    Additional Information Hot Surface Ignition Study

    23