A stochastic model of the overall cleaning process and consequent corrosion was developed for an ethylenediaminetetraacetic acid (EDTA) based cleaning process. The model includes: (1) a chemical reaction engineering model(s), (2) a finite-element analysis (FEA) and (3) a Markov model of non-uniform corrosion sites.
Composite materials are being widely implemented for repair scenarios within refineries – domestically and around the world. This paper will discuss concerns, considerations, and needs typically encountered when using Engineered Composite Repair systems to repair live, operating piping systems in a plant environment.
Technical analyses and laboratory testing in advance of a wiped-film evaporator system installation and operation as well as the results of initial cleaning evolutions. The technical evaluations included: 1) finite element (FE) stress analyses, 2) laboratory displacement measurements to confirm FE results, 3) material integrity testing, and 4) laboratory effectiveness testing.
Pressure cycling and ultimate failure pressure testing was conducted on various pipe samples to verify the design formulas meet the specifications and are correct for use in design of field repairs. Results show that use of strain-based design methodologies for composite repair systems is suitable and effective.
An optical fiber corrosion sensor is developed to monitor the penetration of corrosion pits in steel bars. Simply made by encasing one end of an optical fiber into a steel straw. As corrosion penetrates the steel straw wall, the solution and corrosion products fill inside and contaminate the fiber end surface, resulting in a change in the reflectivity.