PaintSquare.com
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Advertisement

Armakleen Company, The


Problem Solving Forum

| More

December 19 - December 25, 2017

When SSPC-SP3 (Power Tool Cleaning) is specified, how should one decide when to apply the tool to the entire surface and when to use it just where the coating appears defective or rusting?

More items for Surface Preparation


Selected Answers

From Stephen Bothello of Jotun UAE Ltd on January 16, 2018:
Generally, power tool cleaning will be specified for spot repairs of coating up to the condition of bare metal, where abrasive blasting is either not advisable (confined space, sensitive areas) or may create more work than intended (like over-blast of adjacent, sound coating areas, distorted edges that require feathering). Historically, abrasive blast cleaning method was found efficient (economics, more area covered at less man-hours) and effective (gives a definite surface profile that is critical for coating adhesion). The better the coating adhesion, the better will be the coating performance for most, if not all coatings. However, power tools based on latest advance technology used for SSPC -SP-3 are now closely contesting abrasive blast cleaning methods. Many power tool manufacturers claim to provide expected surface profiles, cover more unit area in time and demonstrate laboratory test results to confirm coating performance. However, the decision to apply the power tool to the entire surface or limited only to defective/ rusted areas will be taken by asset owners based on many factors. Foremost under consideration is the coating exposure environment, whether atmospheric (ISO 12944- C1 to C5), immersion or buried (ISO 12944-Im2/Im3). Note that IMO PSPC provides a limit for power tool cleaning up to 2% of surface area or less than 25 sq.m of contiguous damages for sea water ballast tank linings (new construction). This suggests a good guideline by the industry body for coatings subject to immersion exposures. For atmospheric areas, these limits can be stretched based on coating compatibility and aesthetics. The extent of the defective or rusted area is another critical consideration. Generally, for most coating manufacturers a degree of rusting up to and  below Ri3 per ISO 4628-3 (Rust Scale below 10 to 6 - ASTM D610) would call for spot repairs to be undertaken. A full coating removal is also not required if the defect or damage has not penetrated to bare metal and primer is not affected. In all cases, before undertaking spot repairs, it is prudent to determine that the surrounding coating that appears good is indeed sound enough. This can be assessed by visual tests, random adhesions tests (like pull-off tests that measure cohesion/adhesion) and tests to ensure corrosion has not propagated (under-film corrosion). Another important factor is whether the coating manufacturer confirms that the coating can be applied over surfaces cleaned as per SSPC-SP 3. For example, zinc silicates applied as part of heat- resistant coatings systems are not usually recommended over power tool-cleaned surfaces. Owners may also decide based on case specific factors to use power tool cleaning for an entire surface, based on it being the only method viable, safe (HSE), within maintenance cycles and budgetary allocation at that point in time.

Please sign in to submit your answer this question    

Tagged categories: Power tool cleaning; SSPC; Surface preparation


Current PSF Question | Submit a PSF Question | Full PSF Archive

Advertisements
 
Monti Tools, Inc.
 
BRISTLE BLASTER® – THE ORIGINAL ONE
 
  • Abrasive blast with a power tool
  • Remove corrosion, mill scale and coatings
  • Cleans & roughens
  • Meets SSPC-SP 10 / NACE No. 2
  • Profile up to 4.7 mils
  • ATEX Zone 1
  •  

     
    NLB Corporation
     
    NLB Sure Shroud: Greater Protection and Flexibility
     
    NLB’s Sure Shroud’s lighter weight and flexibility reduces operator fatigue and offers unmatched protection against high pressure hose ruptures. 10k to 40k psi rated.
     

     
    SEMicro Division, M.E. Taylor Engineering, Inc.
     
    Coatings Adhesion Testers
     
    The PATTI® accurately measures the bond strength between coating & substrate. Outfitted properly, the surface can be rough, porous, or curved & >10K psi strong!
     

     
    Industrial Vacuum Equipment Corp.
     
    Hurricane Vacuums
    & Dust Collectors
     
    Vacuum and dust collector hose, filters and related accessories.
    IndustrialVacuum.com
     

     
    CHLOR*RID International Inc.
     
    SOLUTIONS THAT WORK
     
    Companies that invest in corrosion control use CHLOR RID products
    • Soluble salt removal liquid
    • Test kits to verify contamination levels
    • Surface passivation to hold the blast
    INFO@CHLOR-RID.COM 800.422.3217
     

     
    Blastox/The TDJ Group, Inc.
     
    Blastox® - One Step Lead Abatement
     
    Sandblast additive delivered to jobsite pre-blended to eliminate hazardous abrasive wastes. Why mix, meter or apply at the job-site? Blast with ease and
    Let your painters paint!
    1(800)-252-7869
     

     
    Graco Inc.
     
    Graco EcoQuip 2: Experience the Difference
     
    While others claim their equipment is the same, none of them compare to Graco’s EcoQuip 2™ Vapor Abrasive® blasting line. Visit graco.com/ecoquip to learn more.
     

     
    SSPC: The Society for Protective Coatings
     
    http://www.sspc.org/
     
    Join SSPC and Enhance
    Your Career !
     

     
    Mitsubishi Gas Chemical America
     
    Performance Amine 1,3-BAC
     
    A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
     

     
    US Minerals
     
    Hit Harder. Clean Faster.
     
    Black Diamond abrasive products are the toughest, most effective blasting media and supply the superior power you need to get any job done.
     

     
     
     

    Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

    TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


    The Technology Publishing Network

    Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

     
    EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
    REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
    MORE:      About PaintSquare.com   |   Privacy policy (Updated 1/8/2018)   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us