Three layer polypropylene (3LPP) pipeline coatings failed prematurely in the oilfields of Abu Dhabi in the United Arab Emirates (UAE). A failure investigation and analysis into this phenomenon was instigated. The coating disbondment has been found to be due to high residual stress concentration and adhesion loss.
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.
Marine fouling is a significant problem in many industries. Since the ban of tributyl tin, a toxic additive prevalent in anti-fouling coatings, various new technologies have emerged to combat this problem. Silicone elastomers are a popular, non-toxic solution to fouling in numerous marine environments. These coatings, however, still incorporate volatile organic compounds (VOC) to aid in application and often require routine maintenance or recoating in approximately 5 years.
Pull-off adhesion behaviors of 15 coating systems in three groups were studied utilizing test method ASTM D4541. Three groups of coating systems included coating systems with organic or inorganic zinc-rich primers, polymeric polyurea coatings, and overcoating systems applied on an existing coating system.
The use of sustainable materials in the flooring market has gained widespread interest in recent years. Bio based raw materials contribute significantly to these efforts and are used to prepare environmentally friendly coatings. Castor oil-based emulsions are used as polyols in waterborne polyurethane coatings. These systems have outstanding chemical resistance and good durability. But they have inherent issues like very short pot life, poor appearance / flow properties, and delayed early hardness development.
Polysiloxane (often referred to as ‘hydide coatings’) products have been one of the major technology platforms used in the European offshore sector mainly due ban on isocynate among several customers. The potential long-term performance of polysiloxanes coatings have also been a strong argument for this topcoat selection in NORSOK (501 – rev 5) systems. There have been several claim-situations with delamination in epically two-coat systems, but similar problems have also been seen on traditional NORSOK systems.
In new shipbuilding industries, conventional solvent-born coatings require longer curing period at low temperature season, which creates the needs for fast curing coatings to meet work schedule. In this study, several kinds of solvent free rapid cure epoxy coatings and polyurea coatings were evaluated in terms of feasibility for ship’s water ballast tanks (WBT).
BASF has developed a novel crosslinking isocyanate-free coating technology based on carbodiimide chemistry. A polycarbodiimide crosslinker with suitable functionality for coating applications and ultra-low free monomeric isocyanate has been introduced to the market. We formulated a 60% solids industrial primer using the new isocyanate-free coating technology and applied it on different metal substrates.
Until a few years ago, water tanks were always drained before exterior surfaces were painted because surface moisture, if found below the water line, would lead to a coating failure. But a coating technology borrowed from the bridge and highway industry and put to a new use is bringing changes to the water tank marketplace. This presentation introduces the original project, includes the coating evaluation after 6 years, and concludes with additional tank examples.