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Beardwood E.S.,Ashland Hercules Water Technologies
NACE - International Corrosion Conference Series | Year: 2011

The global economy has forced a shift in emphasis from preventative maintenance to risk based maintenance with expectations of extending the time between scheduled outages such as turnarounds, while also moving towards longer duration between unscheduled downtime in an effort to increase today's profitability. Utilization of an ROI-based evaluation to schedule maintenance compared to the offset in production throughput at times have been wise decisions and at other times not so wise. As the decisions are one of risk versus reward, an organization may at some point be confronted with an unscheduled outage in the wake of a decision made well in the past that negatively impacts profitability today or in the future. Clearly, there had been either confusion or a misunderstanding in regard to the complexities associated with both the risks and rewards. This paper will discuss the best practices associated with the water treatment and performance management of cooling waters on a holistic basis. This will allow for better definition of the risks in order to ensure the reliability required to obtain the rewards sought by management. Cooling system design compared to actual operational conditions may not approach best practice; hence predictions using modeling to identify potential areas susceptible to failure and then monitoring techniques to predict the health and performance of said cooling system unit operations are outlined to assist in defining the risks and rewards. Case histories are also provided. © 2011 by NACE International. Source


Jerusik R.J.,Ashland Hercules Water Technologies | Davis C.K.,North Technologies
Paper Conference and Trade Show 2010, PaperCon 2010 | Year: 2010

Control of microbiological activity in paper mill systems is essential to ensure optimal efficiency for each paper machine. Sheet defects and breaks caused by biofilm deposition on machine surfaces, production delays due to the frequent need for wash-ups and boilouts, odor in the mill or finished product, and microbiologically-induced corrosion (MIC) are all directly caused by poor microbiological control. Additionally, the preservation of various additives such as starch and calcium carbonate slurry to prevent spoilage and loss in functionality is also critical to papermaking. In alkaline papermaking systems, oxidizing biocides have replaced non-oxidizing biocides to reduce downtime associated with biofilm removal and to increase papermaking yields. Oxidizing biocides offer significant cost and performance advantages over non-oxidizing biocides and are generally compatible with most papermaking furnishes. Oxidizing biocides fall into distinct categories that define their functionality relevant to biocidal control. This paper provides original laboratory data and paper mill case studies that illustrate the performance differences of the various classes of oxidizing biocides. Possible deleterious effects of oxidizers on corrosion and their impact on papermaking chemicals are described. Conventional monitoring methods to assess the performance of oxidizing biocides are presented as well as novel approaches to detect deposit accumulation. Source


Stenfors L.B.,Ashland Hercules Water Technologies
Paper Conference and Trade Show 2010, PaperCon 2010 | Year: 2010

With an ever increasing amount of recycled furnish being consumed in the paper industry, the amount of pitch, stickies, and other hydrophobic materials in continues to rise. As a result, the number of paper mills encountering pitch- and stickies-related upsets is significantly higher than a decade ago, and mills that have been treating pitch and stickies for years are finding deposition more difficult to control. To help papermakers manage this escalating problem, Ashland Hercules Water Technologies recently developed a family of new fixative products, which offer improved fixative properties to reduce the amount of stickies contamination when used as stand alone products or in combination with detackifier products. This paper describes this innovative technology and its benefits in commercial applications. Source


Sutman F.J.,Ashland Hercules Water Technologies
Paper Conference and Trade Show 2011, PaperCon 2011 | Year: 2011

Paper machine runnability is largely determined by the cohesive forces within the wet web and the adhesion of that web to roll and fabric surfaces. Papermakers wish to increase sheet filler content in order to reduce manufacturing costs. It is well known that cohesion of the never-dried web decreases as sheet filler content increases. This phenomenon is easily observable on commercial paper machines but difficult to quantify. This paper details a laboratory technique for measuring never-dried wet web cohesion. The method is used with PCC-filled copy paper furnish to quantify the decrease in wet tensile strength with increasing filler content. Optimized wet end process additives are demonstrated to mitigate the decrease in cohesion. Use of the right wet end chemistry is shown to help overcome paper machine performance problems caused by increasing filler content. Source


Sheppard P.,Ashland Hercules Water Technologies | Kent K.R.,Ashland Hercules Water Technologies | Molter M.,BTG
Paper Conference and Trade Show 2011, PaperCon 2011 | Year: 2011

For many years papermakers have invested in on-line sensors and analyzers to measure specific parameters and properties in the papermaking process. In order to fully realize the economic benefits associated with on-line instrumentation and measurements, closed loop control is a critical step required for a successful control program. Source

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