January 1, 2014

In the last decade, against a backdrop of stringent environmental legislation, enhanced tank lining performance requirements, economic constraints, and so-called “value-engineering”, several new technologies for tank and vessel linings have been introduced into the market place. In the context of old, new, and forgotten wisdom, this paper probes critical issues that intrinsically have a significant impact on either the success, or failure, of tank and vessel lining applications. An accelerated laboratory testing program was carried out to investigate the performance of nine epoxy linings used, or intended for use, in oil and gas production systems. Candidate epoxy coatings were either proven commercial performers, experimental in nature, or those based on new generation formulations. Thin film multi-coat systems and single coat, solvent free (plural component and single leg airless spray applied) coatings were tested in sweet and sour crude oil.

March 24, 2019

It is well known that dry abrasive blasting cannot remove salts completely and therefore, some residual salts remain on the blasted steel surface. In offshore or coastal corrosive environments, it is difficult to keep the near white metal finish and control salt on the prepared surface until coating application. The bare steel can flash rust in a couple of hours. There are several commercial cleaning products to remove residual salts and to extend the surface cleanliness time. Three types of grit blasted steel surface preparation methods were performed; (1) blasted new steel to SP-10, (2) blasted pre-rusted steel to SP-10, and (3) blasted pre-rusted steel to SP-10 + cleaned with the salt removal chemical. The purpose of this study is to compare the coating performance on these three types of surface preparations. Three types of tests were conducted; rust creepage, cathodic disbondment and water immersion tests. Three different coating systems for atmospheric service and three different coating systems for immersion service were used in this study. The test results indicate that a small amount of residual salts have a detrimental impact on coating performance.

February 15, 2016

Accelerated laboratory investigations were carried out on a set of reagent treated, and untreated, carbon steel test panels. Sets of panels were lined with a 3ct thin film solvent-borne epoxy novolac coating or a single coat solvent-free, thick film polycyclamine cured epoxy. Characterization of the lining performance, the lining-steel interface, and efficacy of the sulfide removal reagent was achieved using autoclave (TM0185), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM/EDX) and X-Ray Diffraction (XRD).

September 15, 2019

Worldwide, many thin - and thick - film polycyclamine-cured epoxy linings have performed admirably in the oil industry for high-temperature protection of tank and vessel internals. Not withstanding the ever-increasing temperatures and pressure and chemical resistance requirements in oil and gas environments, the demands placed upon linings are becoming more stringent. This article investigates whether the performance of these linings used in maintenance works could be enhanced by first abrasive blasting the steel substrate and then providing a subsequent application (and removal) of a unique chemical reagent to remove deleterious sulphide contaminants, thus improving lining performance in aggressive immersion service conditions, and potentially extending the life-cycles of the applied linings.

November 1, 2019

Is there such a thing as “blind chance”? Enter the realm of cause and effect and lining performance. Failing to see sulfide contaminants on a so-called ready-to-be-coated steel surface may be like not seeing the bullet in the chamber in a game of Russian roulette — not necessarily good for longevity in either case.

March 24, 2021

Corrocoat USA was contracted to restore a series of pump housings from launch pads at Kennedy Space Center. The pumps were installed 60 years ago, over that time corrosion had lead to a loss of efficiency as well as reliability. ‍The pumps run at 100% deadhead for 8 hours before a launch, these forces combined with corrosion lead to deterioration of the RA bore and cracking of the cutter.‍