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

PaintSquare


Problem Solving Forum

| More

June 6 - June 12, 2011

What is the preferred method to remove 25-year-old coal tar epoxy from a carbon steel tank in order to reline?

More items for Surface Preparation


Selected Answers

From vikraman govindraj of Rigmetals L.L.C on August 13, 2011:
     Since it's a 25-year-old coal tar, do the preparation in three steps . First, chip and hammer to remove the old rust, then proceed with sweep blasting to open the face of paint, and finally blast with new garnet to achieve the required grade. This will be time consuming but give good results and safe work.

From Philip Gooden of BlastJet on July 7, 2011:
     Definitely, use UHP water jetting (40,000psi). If the surface profile is not sufficient, follow the UHP with a whip blast using garnet.

From Doug DeClerck of MES on June 9, 2011:

     Are we talking about "HOT ENAMEL" or conventional coal tar epoxy like Koppers 300M? If it is Hot Enamel, then it probably was dumped out and mopped on and could be extremely thick (1/4" or more), and it will get quite sticky in hot weather. Best approach is to do the work in cold weather, chip off the material, and then abrasive blast clean.

      If it is a conventional coal tar epoxy and is under 30 mils, then abrasive blast cleaning out of the gates should work. It may take more abrasive than you think, so plan accordingly. If it is a conventional coal tar epoxy and  is thicker than 30 mils, then you will need to approach the work like a Hot Enamel removal. In any case, protect the workers. The dust can be very aggressive, not just breathing, but skin contact also.

From Lee Edelman of Independant on June 8, 2011:
     Abrasive blast or UHP can be the method. Blast media selection is important if abrasive blast is the selected method. If UHP is the method, depending on the thickness of the coal tar, UHP pressures can range from 30,000 PSI to 50,000 PSI in order to get a WJ2 surface condition. A DH unit will help if the process is done during winter months. Proper PPE and confined spaces certs will be required during this process.

From Gary Peterson of Blason Industries on June 8, 2011:
Chip the coal tar away with either air tools or electric. Sand blast the walls, shotblast the floors using steel shot mixed with grit.

From jesse chasteen of schriener construction on June 7, 2011:
     If the coal tar was applied in the state-of-the-art fashion available 25 years ago, the best way is, RUN-AWAY, and don't do it. (Just kidding) Protect your crew and .send them in with air scrapers and pull of as much of the bulk material as possible before you start sandblasting to required specification. The coal tar will range from 20 mils to greater than 200 mils on this, I would bet. Skin protection and air changes are the key to comfort as the removal of this coating has got to be in the top three for miserable.

From Ryan Simpson of Simpson Sandblasting on June 6, 2011:
     Chip the coal tar and abrasive blast to SSPC-SP 10.

From Travis Miller of Corrpro on June 6, 2011:
Use UHP on the surface.

From Ron Lanter of Protec on July 26, 2011:
     Nothing beats abrasive blasting with sand or black beauty. I hate water blasting. What a mess. I personally would never do it. Those guys are more of a man than me.

Please sign in to submit your answer this question    

Tagged categories: Paint and coatings removal; Tank interiors


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

Advertisements
 
Montipower, Inc.
 
The MBX Bristle Blaster
 
Get a 2.7 to 3.3 mil profile and a Near White Metal Clean. For info visit www.mbxit.com or call 877 629-8777
 

 
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
 

 
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.
     

     
    Advanced Recycling Systems
     
    ARS C-Class Recyclers
     
    World leading abrasive blast recycling systems in a compact size. Quality, performance, savings… www.arsrecycling.com 330.536.8210
     

     
    Sherwin-Williams
     
    Sherwin-Williams General Polymers Resinous Flooring App
     
    Our coatings and linings expertise available 24/7, allowing you to explore the Sherwin-Williams systems best suited for your flooring needs. Android Users Click here to Download the app today!
     

     
    Clemco Industries Corp.
     
    Maximum Dust Suppression Systems Start at $14,950
     
    The system comprises proven technology and equipment with user-friendly flexibility in mind. See it in action.
     

     
    Atlantic Design, Inc.
     
    ENGINEERING SOLUTIONS, NOT EXCUSES
     
    See our website for features of our best seller, the ADI 3500CFM 4-Pot Blast Vacuum Recycler. A smaller package with all the ADI power you need. 866.Call.ADI
     

     
    Harsco
     
    BLACK BEAUTY® App
     
    Download the free app for BLACK BEAUTY® Abrasives. Explore all the features from the palm of your hand.
    Toll Free: 1-888-733-3646
     

     
    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.
     

     
     
     

    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   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us