It has been important for the oil industry to establish reliable test method(s) for qualification and safe utilization of subsea pipelines and components made from stainless steels. This paper describes a method that has been developed through a JIP executed with support from leading oil companies and meterial suppliers.p
Scale control is vital for cooling water operations, and evaluation of best-fit scale inhibitors for the application is essential, for the scale treatment. One of the traditional test methods for industrial water scale inhibitor screening is static bottle testing. Recently, in other industries, Kinetic Turbidity Test (KTT) has gained more acceptance for scale inhibitor evaluation. KTT uses an Ultraviolet-Visible (UV-Vis) spectrophotometer to monitor scale formation at various dosages of tested products, as function of reaction time. The technology can provide minimum dosage recommendations for the treatment with selected inhibitors, and give the insight on scale formation kinetics and mechanism, under the effects of different types of scale inhibitors.
Polymer dispersancy in waters with particulates such as iron oxide and clay, is also an important characteristic to evaluate, in systems with high levels of suspended solids or fine particles. Previously(currently), this testing was conducted in bottles where the turbidity of solutions were measured by pipette transfer to a cuvette and turbidity meter, providing one data point at a certain time. Kinetic turbidity testing can continuously and simultaneously monitor and record turbidity changes with time, under the effects of various polymer dispersants and dosages. This capability provides more thorough and objective data, for scale control product evaluation.
This paper presents the approach to evaluate scale control chemistries for industrial applications by KTT, and compares the KTT test data, with bottle test results. The laboratory testing results show that KTT provides a fast and data-driven approach for evaluating performance of scale inhibitors and dispersants.
THE MOST COMMONLY USED TESTS TO EVALUATE ATMOSPHERIC SURFACE COATINGS ARE: (1) ATMOSPHERIC EXPOSURE: (2) COATING PROPERTIES SUCH AS CHEMICAL, ABRASION, AND TEMPERATURE RESISTANCE: AND (3) ACCELERATED TESTS SUCH AS THE CARBON ARC RADIATION-WATER SPRAY, INTERMITTENT IMMERSION, AND SALT SPRAY (FOG) TESTS.