Reline & Repair Industrial Sulfuric Acid Tanks For Corrosion Control
Storing sulfuric acid ($H_2SO_4$) in fiberglass reinforced plastic (FRP) presents unique challenges. As concentration levels fluctuate, particularly above 70%, the acid becomes an aggressive dehydrating agent that can chemically attack standard resin matrices, leading to "fiber blooming" and structural embrittlement.
At Plastech Services, Inc., we move beyond generic repairs. We engineer heavy-duty FRP tank linings specifically designed to withstand the exothermic reactions and corrosive intensity of sulfuric acid environments.
If you are facing resin attack or crazing in your acid tanks, we can help with Fiberglass Tank Repairs.
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The Chemistry of Resistance Why Standard Resins Fail
In sulfuric acid applications, not all fiberglass resins are created equal. Standard Bisphenol A (Bis-A) vinyl ester resins are often effective for general chemical storage but lack the cross-link density required to resist permeation at higher acid concentrations or elevated temperatures.
For sulfuric acid service, Plastech exclusively specifies Novolac Epoxy Vinyl Ester resins (such as Derakane 470 or Hetron 922 equivalents). The Novolac chemical structure provides a significantly higher cross-linking density. This creates a tighter molecular barrier against acid permeation, offering superior retention of mechanical strength at high temperatures (High HDT) and resistance to oxidation.
Need help? Start your project with a Fiberglass Tank Inspection.
A successful lining is 20% material and 80% application. Our ISO 9001 Certified process ensures the lining bonds permanently to your substrate to prevent catastrophic delamination.
Unlike steel, you cannot simply blast fiberglass to "White Metal." Sulfuric acid residue must be neutralized first to prevent it from being trapped behind the new liner.
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Decontamination: We steam clean and neutralize surface acidity to pH neutral.
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Abrasive Blasting: We blast the interior to remove the damaged corrosion barrier and expose the structural glass fibers, creating a mechanical tooth for the new laminate without compromising the tank's structural integrity.
To maximize corrosion resistance, we apply a Double Surfacing Veil (typically C-Glass or Synthetic, depending on fluoride presence). This creates a resin-rich inner surface (90% resin) that acts as the primary defense shield, protecting the structural layers from chemical attack and preventing wicking.
Crucial for FRP: Standard fiberglass is non-conductive, making high-voltage spark testing impossible on a standard repair.
Our Solution: Plastech applies a conductive carbon-filled primer or carbon veil behind the new liner. This allows us to perform High-Voltage Holiday Testing (Spark Testing) to verify the lining is 100% pinhole-free before we leave your site.
We verify the cure of the Novolac resin using Barcol Hardness Testing and acetone sensitivity tests to ensure the lining has achieved full chemical resistance before the tank is returned to service.
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Fiber Blooming: If you see fuzzy white fibers exposed on the interior wall, the resin barrier has eroded, and the acid is now attacking the structural integrity of the tank.
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Osmotic Blistering: Bubbles in the liner indicate permeation. This occurs when acid vapors pass through the liner and condense against the structural wall, pushing the liner out.
Plastech utilizes advanced ultrasonic testing and visual standards (ASTM D2563) to assess the depth of chemical attack. We can help repair and reline your tank for long-term Sulfuric Acid Containment.
