Serving Chemical Cargo Tanker Industry for over 40 Years
Corrosion Shield is the most sought-after specialty composite company for lining inspections and repairs nationwide. We focus on chemical cargo motor vehicle linings.
After over 40 years working with composites, including chemical storage tanks, piping, pressure vessels, and the like, we bring an unsurpassed passion and experience for great service and safety in the chemical cargo tanker industry.
Liners of all kinds, including composite, epoxy, and rubber, and thermoplastics. These inspections are done following 49 CFR DOT 180.407 lining inspection and repair procedures. Corrosion Shield inspects and repairs in all regions of the US and Canada. Our team of experienced technicians can evaluate and certify your cargo tanker motor vehicles for safe travel of your chemicals.
Corrosion Shield staff is one of the most knowledgeable in the 49 CFR- 180.407 (f) Lining area of transportation and will travel to train technical staff on the proper lining and internal inspection requirements needed.
Fiberglass-lined cargo tankers have been in the market for decades. Composite shells are durable and long-lasting, with life expectancies in the 20 plus year range. These tankers are great for dedicated services, as well as multiple use and change, but as they age, there are cautions and care recommendations that should be observed.
There is mainly one type of resin used for these linings, although several brands within this type are seen:
Vinyl Ester such as Derakane 411-350 Momentum or Derakane 441 and or Derakane 510.
New linings from the factory usually last longer due to the fact that they are molded surfaces. This does not allow the chemical to penetrate as quickly, initially. Once it has been determined that the existing liner has been breached and a new lining has been installed, then care and use is essential for a long-lasting re-life of the cargo tanker motor vehicle.
Care and Use
Once the lining has been finished, confirm that it is cured and a “Barcol” hardness has been recorded and is acceptable.
Rinse the new lining and make sure the internal is clean and ready for use.
Dedicate the new lining if possible for the chemical to be hauled.
Confirm using the Derakane chemical resistance guide that the chemical to be hauled in the percentage planned is acceptable for the resin used.
Once the VIKPL has been passed, the chemicals can be hauled.
Keep the unit vented when empty. Don’t let the pressure build when empty.
Keep the pressure for offloading as low as possible and never more than 35psi. The higher the pressure at each offload, the more stress is put on the shell. Some shells can handle the stress more than others, but the lower the pressure, the better.
Caution when hauling on rough roads and turns and twists that affect the shell. Keep speeds and stress in these situations at a minimum. It will help the shell last longer.
It is better to keep the interior moist and wet. When it dries out, the laminate will shrink and affect the lining as it ages.
No need to rinse between loads. It is better to have the dedicated chemical in the vessel rather than enter the water. Different waters can affect the chemical reaction to the dedicated load more than just leaving it.
Keep radical temperature changes to a minimum. Load product as close to the shell temperature as possible, and or increase the temperature slowly over an hour or so and not sudden. These thermal changes can affect the liner and its ability to expand and contract normally.
If you are going to change chemicals, triple rinse, test the water with a PH strip before changing to confirm it's neutral. Keep in mind that as the FRP liner ages (2-4) years, you will find that mixing and changing chemicals can affect the life of the liner due to the chemical reactions created when mixing. It affects it worse the older and more permeated the liner is, as the residual chemicals are trapped in the saturated substrate. (liner).
Make sure the annual internal Liner inspection is done by a trained, experienced registered inspector so that the life and care of the liner are at its best.