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Traditional internal lining schemes for the storage/transport of crude oil & refined fuels may no longer be appropriate. The aggressive nature of crude oil (high temp. & more sour), high purity refined products & increased use of biofuels demand better linings & more certain test results. The focus of this paper is to review the trends in test methodology from the early 1990’s to present.
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Styrenated Unsaturated Polyester & Vinyl Ester coatings are accepted for use in chemical immersion tank linings. The primary advantage is the increased chemical resistance to harsh commodities and fast turnaround time compared to epoxy coatings. However, styrene is becoming heavily regulated due to its safety and health concerns.
Thick-film elastomeric coating / lining systems have excellent performance characteristics in a variety of potable water lining work, including the polyurea spray elastomer technology. While some have cast doubt on the suitability of a polyurea system for immersion applications, there are a variety of commercial products with the NSF/ASNI-61 certification for potable water use that are performing quite well.
Tank lining products are necessary for protection of infrastructure and commodities to ensure daily business operations continue smoothly. They are expected to protect the tank from corrosion and chemical attack while maintaining the purity of the tank’s contents; ultimately keeping people and the environment safe from an accidental discharge. Rigorous laboratory testing programs and field trials are conducted to instill confidence the right product is recommended for each task.
Solvent-free epoxy coatings have been widely specified and used over recent years in Australia as linings for a variety of immersion service exposures, specifically for potable water storage and tank linings for some petroleum products. However, they have not always delivered the durability or performance hoped for.
The practice of induced heat to decontaminate a tank (pre-baking) that has been in previous service for re-lining and / or the post application heat curing (force curing) of an applied lining may be considered as a lost art known currently to the few lining specialist within the industry. The objective of the presentation is to inform or remind Owners, Specifiers, Inspectors, Applicators and Vendor Representatives of the requirements and benefits of these processes to obtain a successful relining or tank lining project and additionally attain time savings and prevent cold curing issues.
Advanced technology high performance tank linings are often applied by plural spray equipment and occasionally one of the components could be off ratio. Worse still, some well-intentioned field personnel might add more curing agent to speed up the cure, or alter other properties, or may not utilize the entire curing agent portion in a single leg application. This paper investigates the effects of under-cure or over-cure on the performance of two high temperature tank linings by deliberately mis-mixing the two components.
When Marsden Point Oil Refinery in New Zealand needed to reline 3 steel crude oil storage tanks, the engineers began a search for a lining with the necessary properties to provide a long-term solution.
In the early 1900’s, a small community in the mountains of western Maryland, installed two potable water tanks that were open top and below grade. Over the years, they began leaking water into the basements of nearby residences, so several upgrades to the tanks were planned. The upgrades included the addition of metal dome roofs, electronic security systems with fencing, and a waterproof lining system. Contractors were invited to view the facility and bid the lining system while the tanks were still in service – first mistake
This presentation will high light the new ultra-high solids tank lining products and discuss the equipment necessary to properly apply them, giving owners the ability to return their tank to service in a very short time frame.