Inspection has always been a hot topic when it comes to coatings projects. There are some substrates that can be harder to specify due to not knowing without knowing which testing is relevant to specify and properly inspect the substrate and surface after it is coated. Concrete is probably the number one substrate that is confusing. This paper will dive into the testing that is relevant when specifying coatings for concrete tanks and structures. Whether it is how to properly check film build or whether or not an ASTM test is relevant, this paper will clear the waters and make specifying coatings for concrete tanks and structures easier.
Asbestos-containing textured surfacing materials, as well as other types of asbestos containing materials, were historically applied in significant quantities to concrete bridges and other structures built as late as the early 1990’s. During renovation (surface preparation for overcoating or total coating removal and replacement) or demolition of bridges, just like buildings, there are specific regulatory requirements such as licensure, inspections, procedures and notifications that must be followed to avoid compliance violations, litigation and to avoid unwanted asbestos exposure to employees and the environment.
The Paint Industry is a Sustainable Solution Provider to Several Industries.
Like Construction, Boating, Aero, Furniture, Sports, infrastructure projects,
and so on. Anything to which Paint touches, it increases, the life and beauty
by several times. This longer life of objects and structures save millions of
man-hours, extractions of resources, time, energy, and carbon footprint
during the process.
As global environmental regulations continue to tighten restrictions on VOC-containing coatings, the need for hydrolytically stable additives in waterborne coatings has never been greater. Alkoxysilanes are a class of widely used additives in the coatings industry, as they act as adhesion promoters between organic coatings and inorganic substrates. Given the high moisture sensitivity of alkoxysilanes, most silane additives rapidly undergo condensation in waterborne coatings, leading to gelling of waterborne coatings within the first few weeks or months on the shelf.
The U.S. Army maintains a global presence and is required to abide by environmental safety and occupational health regulations and restrictions in all operating environments. As a result, coatings technology advancements and improvements must stay ahead of ever increasing and changing requirements. The U.S. Army Combat Capabilities Development Command (DEVCOM) Safer Alternatives for Readiness (SAFR) program has funded efforts to formulate coatings free of ingredients including n-methylpyrrolidone/NMP, isocyanates, and chromium, while updating specifications to allow for new formulations and promoting their implementation Army-wide.
It has become common practice for specification writers to require minimum tensile pull-off adhesion strength values as part of the acceptance criteria for protective coating work for concrete substrates. These values are convenient for specifiers because a minimum number provides a black and white basis upon which to define success versus failure. But there is much more to performing and evaluating adhesion testing than a hard and fast number.
Being proactive and performing scheduled coating condition assessments on above ground storage tanks to prevent corrosion is of utmost importance to protect assets. Undetected corrosion can result in product contamination, section loss, create compliance issues resulting in fines levied by governmental agencies, and increase costs of asset replacement. Planned and detailed coating/lining condition assessments can help a tank owner realize the current condition of their assets and maximize life expectancy.
Every day a new specification comes out naming coating manufacturers reps as performers of Coating Inspection duties on projects. These often include multiple scheduled job site visit commitments and having the manufacturers rep sign off on inspection hold points. I know that in some instances this is due to old outdated engineer and owners’ specifications where this stipulation has been in the documents for years and no one ever bothered to remove it, even though they may agree with me on this point.
The role of a Coating Inspector has evolved considerably over the past few decades, and the responsibilities have increased over what used to be a rather straightforward job: to verify that surface preparation and coating application meet the project specification requirements. Today there are week-long or multi-week basic and advanced coating inspection courses, specialty courses that are industry-specific (e.g., bridge, nuclear), courses that are substrate-specific (e.g., concrete coatings inspection) and even coating-specific (e.g., inspection of thermal spray coatings).
Industrial assets operating at 140 °F or above may be thermally insulated to prevent plant operators and personnel from experiencing skin burns after accidental touches. Insulation, however, increases the risk of the underlying substrate of suffering from corrosion. Typical insulating systems should consist of three components for a comprehensive and effective insulation strategy: high quality corrosion resistance coatings, absorbent insulation materials, and both effective and durable weather barrier or jacketing.
Third Generation Polysiloxane (TGPS) ambient curing CUI mitigation coatings have been used in the petrochemical industry for over five years since the “third generation” concept was introduced at NACE Corrosion 2017. These coating technologies have demonstrated positive results in both shop and field application for asset management in elevated temperature, cryogenic and cyclic applications across -196 to 650o C/ -321 to 1200o F operational temperatures. TGPS coatings have also demonstrated effective use of a two-step (primer-insulation) CUI mitigation coating approach operating up to 400o C/750o F, when compared to the traditional (CUI coating-fibrous insulation-cladding) systems.
Corrosion Under Insulation (CUI) is a very serious problem impacting the oil and gas, petrochemical, power and heavy industries. Due to the high costs associated with CUI, many industries have begun abandoning conventional jacket insulation. Recent advancements in trade association standards have helped engineers select, apply and inspect different types of insulative coatings in lieu of conventional jacket insulation.