PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Download our free ebook on Advances in Corrosion Control Coating Technology

Problem Solving Forum

| More

June 4 - June 8, 2012

How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?



More items for Surface Preparation


Selected Answers

From Josh Inklovich of Total Coating Solutions on June 8, 2012:

     This is a tricky one. I have had to do this on numerous occasions when an "experienced" coating applicator neglected to add the part B's to the part A's in a 1:1 mix product. I can only advise what we have done: 1. Use scrapers to remove as much uncured coating as possible. Scoop and throw it in a bucket. 2. Solvent wipe the remaining material. Jeremi mentioned using MEK. My suggestion is to use the solvent recommended by the manufacturer. Different coatings more fully dissolve in different solvents. Use stiff bristle brushes and ample solvent to get the uncured coating out of the profile. Obviously, utilize air moving equipment and "sniffers" to detect levels of vapors. Your men should be wearing tyvek suits, spark-resistant foot covering, and spark-resistant (i.e., non-metallic) tools during this entire operation.    

     Additionally, forced air, full face respirators should be used. 3. Use lint-free, solvent-soaked rags to mop up the remaining material. Keep cleaning until the rags are clean after wiping. 4. After this is done, we DID reblast everything with Starblast each time this was encountered (3 times in 12 years). You now have another potential issue. If you can't blast, how are you going to prep the surface for relining?

From David Grove of Shaw Nuclear Power Services on June 13, 2012:
    One key in removing uncured coatings is to keep in mind that if the material can be changed into a physical state where it is no longer "sticky" to the substrate, then it will be easier to remove. In many cases, high heat will make this happen, and there are a number to tools that will do this. Of course, a second surface preparation will still be required for reapplication.

From Murjan Murjan of Sirte Oil Company on June 12, 2012:
     The first thing is solvent cleaning and abrading the old coating ,then use SP 3 power tool cleaning. After that, blow down and coat the surface.

From Jeremi Day of Allphaz Inspection Services on June 4, 2012:
     Unfortunately, a strong solvent such as MEK must be used. Two drawbacks come with this solution. One is that it poses as somewhat of a safety hazard to the crew. They should wear respiratory protection, double eye protection, and chemical gloves at a minimum. The other is that they must use plenty of rags and the rags should be white rags, which are more expensive. If color rags are used, the dye will transfer from the rags to the substrate, which will present yet another problem. The crew will have to use a large amount of rags and solvent. If not, as the rags and solvent get more and more dirty with the un-cured coating, it will transfer back onto the substrate. Also, brushes should be used to remove the un-cured coating from the crevices of the weld seams. In my experience, this is the best way to remove all traces of the coating without blasting. The only other solution I can think of is to wash with UHP. In some instances, depending on the coating, this may cause more problems.

Please sign in to submit your answer this question    

Tagged categories: Surface preparation; Tank interiors


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

Monti Tools, Inc.
BRISTLE BLASTER® - THE ORIGINAL ONE

Surface cleanliness of SSPC-10 | Anchor profile
up to 4.7 mils | Removes corrosion & coatings |
ATEX approved for zone 1
| www.monti.com | 832-623-7970


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.


Axxiom Manufacturing
The Undisputed
Industry Leader.

Proven Innovation. Job Performance. Industry Training. Workplace Safety. Only Schmidt® abrasive blast equipment by Axxiom Manufacturing delivers it all!


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


DRYCO
Humidity & Temperature Control Equipment

Rental Desiccant Dehumidifiers, ArcticDRY Units, Air Conditioners, Heaters and Generators to help control the climate on your next industrial painting project. Nationwide locations, 24/7 service: (866) 379-2600 www.drycogroup.com”


Corrosion Probe, Inc.
From Detection to Correction

Corrosion Probe, Inc. has the Most Concrete Coatings Experience and Expertise. Contact us today at
860-767-4402, www.cpiengineering.com


CHLOR*RID International Inc.
Hold*Blast

*Stop flash rust
*Provides outstanding
performance
*Easy to use and only pennies
per square foot
*Works with poor quality
water
*Use for mist blasting, vapor
blasting, wet blasting and
UHP WJ
*Leaves no residue and
provides excellent adhesion.


able equipment rental
RENTALS | SALES | SERVICE | PARTS

Construction equipment, plus compressors up to 1,800 cfm of air power & a fleet of service vehicles providing repairs to customer owned fleets. 866-468-2666.
www.ableequipment.com


Abrasives Inc.
Check our Prices for Blast Abrasives

Faced with higher abrasive costs? We invite you to call & check our rates on Black Magic® coal slag and other quality blast materials. Abrasives Inc. 800-584-7524


Dehumidifiers, Sales and Consulting
How long can you hold a WHITE-METAL BLAST?

Click to learn how 30 DAYS is easy! Don Bechtol has over 40 years of experience utilizing DH for blasting/coating projects. Call today.
1-713-249-1615
¡SE HABLA ESPAÑOL!

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design 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
 

© Copyright 2000-2016, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com