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Liquid-applied protective linings are commonly used to protect concrete structures found within water and wastewater treatment facilities. There are a number of referenced industry standards and guidelines detailing the construction of new concrete, evaluation of existing concrete, and surface preparation of concrete. This paper provides recommendations based on industry standards and related publications, as well as drawn from practical experience for preparing concrete for immersion conditions or chemical containment service in water and wastewater treatment.
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In many instances, concrete needs to be repaired and waterproofed prior to coating. General practices apply across many different market segments. Vertical, horizontal and overhead repair scenarios have many things in common and a variety of repair products to consider depending on jobsite conditions, time frame and ultimate exposure of the repair materials (chemicals, weather, movement, etc.). The purpose of this paper will be to outline, in general terms, different types of repair scenarios that have a proven track record and are available for owners, engineers/architects, and contractors to utilize.
This paper summarizes environmental health and safety compliance issues as they relate to coatings projects. It summarizes control measures that should be taken to protect employees from exposure to agents such as silica, methylene chloride, n-methyl 2 pyrolidone, lead, and asbestos. Best practices are discussed. This information is taken from the Occupational Safety and Health Administration, the National Institute of Occupational Safety and Health and the American Conference of Governmental Industrial Hygienists.
Neptune Bulk Terminals in Vancouver, British Columbia needed to re-coat two of its ocean-going Potash Ship Loader conveyors within a 27-day window to prevent interruption of international ship loading schedules. The contractor elected to use ultra high pressure water jetting (UHPWJ) for the steel surface preparation rather than the sand blast medium used on the previous loader conveyors. This required innovative desiccant dehumidification equipment to facilitate rapid drying of the steel upon completion of the UHPWJ work due to an increased moisture load.
In the application of coating / lining systems, applied film thickness is an important aspect in the execution of the project. Specifications call for a required minimum film build, not to verify material use, but because it relates to the overall performance of the project. Knowing the applied film thickness of the coating / lining system as the job proceeds also helps determine if one has obtained sufficient material to successfully complete the application work as specified.
Recognizing the need to elevate craft workers’ skills within the industrial coatings industry, the International Union of Painters and Allied Trades (IUPAT) became involved in the development of the published SSPC ACS 1/NACE No.13 Joint Standard and the Body of Knowledge contained within. Since the development of the joint standard, the IUPAT has taken advantage of the opportunities afforded by the standard and remained committed to ensuring that its members are properly trained and certified as prescribed by the industry standard.
Answers for common questions concerning galvanic corrosion. Galvanic corrosion & how to stop it. Prevention. Additional offshore environments (low oxygen and high temperature), caustic soda and atmospheric applications. 2nd edition 2017 NACE
Coating specifications frequently reference industry standards from organizations such as SSPC, ASTM, ISO and NACE. While specifications may reference a specific version or “year,” many simply state, “the latest version of the standard applies.” Many standards writing organizations require a review of the content of their documents every 5-years (or more frequently), and updates/revisions to standards can and oftentimes do occur. And new standards are developed and published to fill voids when a need for a standard is identified.
Maintaining aged infrastructure can be challenging, especially when structures were designed with difficult-to-coat features, such as riveted construction, back-to-back plates, or skip welds. According to NACE SP0178 - Design, Fabrication, and Surface Finish Practices for Tanks and Vessels to be Lined for Immersion Service, these construction methods are not recommended for immersion service.
The importance of moisture testing of concrete floors cannot be stressed enough. Moisture is a leading cause of coatings failures on concrete floors. There are many ways moisture can affect floor coatings on concrete. Moisture testing alone is not sufficient enough at detecting all of the potential problems. Inspecting a building prior to performing any tests will provide a much clearer picture of the potential problems moisture in both liquid and vapor form can pose.
HISTORICAL DOCUMENT. Procedures to design, apply, and inspect fiberglass-reinforced plastic (FRP) linings on the internal bottoms of aboveground storage tanks (ASTs) in the petroleum/petrochemical industry and in other service.
Procedures to design, install, and inspect thin-film organic linings in carbon steel process vessels to prevent corrosion, other degradation or product contamination.