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Problem Solving Forum (63)


Animal fat in slaughterhouses often penetrates concrete surfaces. If the fat is not removed before the concrete is coated, the fat can cause the coating to fail. How do you identify and remove the contamination before coating the concrete?


What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?


In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion (MIC)?


When blasting cast-iron structural steelwork, what type of defects might be found, and how do you address them?


What advantages/disadvantages have you seen with using recycled glass abrasives vs. traditional abrasives?


How pure must fresh water be for water washing or waterjetting, and how do you determine the water’s purity?


How long after blasting can stainless steel be left before painting? If this time is exceeded, what further surface preparation is required?


What are the pros and cons of specifying sieve sizes for abrasives?


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


How long can a blasted surface be left before priming under different temperatures/relative humidity environments?


How do you determine if local water is suitable for use in UHP waterjetting, particularly in areas where potable water is scarce?


What measures must be taken to determine and assure the cleanliness of an abrasive?


What is the best method for removing production machine oils soaked deeply into a concrete floor before applying a non-skid coating?


When refurbishing an old concrete secondary containment wall around a storage tank, what criteria should be used to determine if a crack can be repaired for coating or if the section of the wall should be rebuilt?


Are there special primers and surface preparation requirements for painting unpainted aluminum?


When should you specify UHP waterjetting on bridges?


I’ve heard that the use of the proper blast media is critical for the successful application of thermal spray aluminum and other metallics. What mechanism would lead to the differing performance characteristics of the TSA based on the blast media?


Under what conditions should you apply a resurfacing mortar to new, below-grade vertical concrete scheduled to receive a high-build, protective lining system for chemical containment or immersion service?


I’ve heard about using crystalline admixture or crystalline materials on top of concrete to fill voids and make the substrate less permeable. When is this desirable, and what is the best way to use these materials?


How to do you abrasive-blast the interior surfaces of steel or ductile iron pipe scheduled to receive a high-build, high-performance protective lining system?


How clean must the compressed-air supply be for blast cleaning, blow down and painting? How is cleanliness of the air determined?


A specification for a bridge to be built of high-performance weathering steel requires an SSPC-SP 10, a profile of 3 to 5 mils, and metallizing with a final DFT of 10-12 mils. What challenges, time, and costs are associated with obtaining the profile?


Is grinding the only way to remove large areas of a silicone coating from a ship's hull to replace the silicone with an epoxy mastic?


How should surface preparation be conducted in non-sparking atmospheres?


When performing maintenance surveys on structures that require coatings under insulation, how do you inspect the condition of the coatings?


The literature indicates that UHP waterjetting produces a profile on steel, although of a micro nature. Is this sufficient roughness for good adhesion of thin-film primers?


Do you need to wait for the mortar to cure before repainting a brick surface after repointing and power-tool cleaning? If so, how long, and how do you judge when it is safe?


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?


How does residue from chemical stripping affect the performance of the replacement coating?


What are the pros and cons of using shotblasting to remove a coating system from a concrete floor?


What kind of initial treatment is the best defense against graffiti for rough-surfaced concrete block (CMU)?


How, besides grinding, can one remove large areas of silicone coating from a ship’s hull to replace the silicone with an epoxy mastic?


When animal fat in slaughterhouses penetrates concrete surfaces, how do you identify and remove the contamination before coating the concrete?


When a food plant runs 24/7, even during coating maintenance, tiny airborne food particles can contaminate a prepared surface. How do you identify, prevent and/or remove such contamination before coating?


What is the best way to remove thick-film elastomers from floors and ship decks?


Which type of abrasive blasting media is suitable for preparing the more “exotic” stainless steels, such as Inconel or Monel?


I need to coat a bare concrete warehouse floor that has visible oil stains. What are my options for cleaning the concrete before coating it?


There are ways to increase the pressure for waterjetting to levels above 20,000 psi. What are the effects of different pressures (below and above 20,000 psi) on cleaning ratios?


I keep reading references to sweep blasting, but I can't find a standard for it. What is sweep blasting, and is there a standard for it in the U.S. or elsewhere?


How do you prepare an oil-stained, bare concrete floor for coating?


Is there a place for using “rust convertors” in heavy-duty maintenance projects?


What is most effective treatment for steel contaminated with MIC before painting ?


Is it cost-effective to pressure wash a bridge or other structure before abrasive blasting? What pressures, flow rates, and procedures are recommended?


Is it cost-effective to grind steel edges before coating for atmospheric service? Why or why not?


What causes static electricity during abrasive blasting? What risk does it pose, and how can it be controlled?


What is the proper surface preparation for stainless steel before coating to resist a salt-laden atmosphere?


What advantages/disadvantages have you seen with using recycled glass abrasives vs. traditional abrasives?


When blasting cast-iron structural steelwork, what type of defects might be found, and how do you address them?


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


In preparing for coating, what is the best way to treat a steel surface that has been attacked by microbiologically influenced corrosion (MIC)?


What is the best way to achieve proper surface preparation in areas with limited access, such as interior box beams on bridges?


How long can a blasted surface be left before priming under different temperatures/relative humidity environments?


How do you determine if local water is suitable for use in UHP waterjetting, particularly in areas where potable water is scarce?


Some painting specifications call for the use of “Best Effort” in relation to blasting. How does one determine “Best Effort?”


What measures must you take to determine and assure the cleanliness of an abrasive?


What is the best method for removing production machine oils soaked deeply into a concrete floor before applying a non-skid coating?


When should you specify UHP waterjetting on bridges?


Specifications often state that glossy surfaces must be dulled before overcoating. What are some methods for doing this, especially when sanding isn’t feasible or desirable?


How can I determine the cleanliness of stainless steel for painting after blast cleaning?


What are the options for shop-applied systems (surface preparation and coating type) to protect the interiors and exteriors of new saltwater storage tanks and associated steelwork that will be exposed to seawater, and that will allow for easy touchup and maintenance once the structures are erected?


What is the remedial action if a blaster produces too high a surface profile for the required primer thickness?


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


How clean must the compressed-air supply be for blast cleaning, blow down and painting? How is cleanliness of the air determined?


 
 
   

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.


Harsco
Find BLACK BEAUTY® Abrasives

Use our online tool to search by address, city or zip code to find where you can buy BLACK BEAUTY® abrasives. Or call us toll free: 1-888-733-3646


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.
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.
www.chlor-rid.com


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


Advanced Recycling Systems
ADVANCED RECYCLING SYSTEMS (ARS)

Recycling Machines, Dust Collectors, Rapid Deployment units are time-tested and approved for the rugged industrial environment. Contact ARS today!
(330)536-8210


Axxiom Manufacturing
Schmidt Improves
Portable Blasters

Schmidt's VBS System reduces blowdown intensity, prevents exhaust from damaging floor while using no screens or filters. Reduces sound; Increasing safety.
Call 1-800-231-2085


Atlantic Design, Inc.
CLICK TO SEE...

what we did to this machine! Let ADI upgrade your machine, extending the life, efficiency, and value. Any make. Like new, but better! 866.Call.ADI


Nationwide Overspray
Profession Overspray Removal Services

The Finest Name in Safe Overspray Removal. We specialize in removing all contaminants from any surface. Family Owned and Operated for 33 years! Fully insured. Satisfaction is guaranteed.


DeHumidification Technologies
HUMIDITY PROBLEMS?

DH Tech has the most innovative and reliable equipment available to
control humidity efficiently
and effectively.
IT'S UNDER CONTROL!

 
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