However, this straightforward single-point test does not provide the complete picture for asphalt flow behavior. Record the viscosity value, make sure that it falls within prescribed maximum and minimum limits, and then report whether the number passes or fails. The standard test method for pumpability, according to ASTM D4402, is to use a regular viscosity (RV) torque rotational viscometer at 20 rpm or a low viscosity (LV) instrument at 12 rpm. An important concept, sometimes forgotten, is that a material’s viscosity is not a single-point measurement, but often depends on a number of factors. This article reacquaints the reader with the basic concepts and terminology for viscosity and addresses techniques to quantify it. The bottom line is to come up with ways to measure viscosity so that you can quantify whether a material will flow the way it needs to. For handlers of all materials that flow, either while being processed or in an end-use, it is important to think about the materials’ flow characteristics. To be brief, viscosity is resistance to flow. Most engineers know what viscosity is, but may have trouble explaining it. Track pump operation with this monitoring system This company has… SHOW PREVIEWS Achema 2022 Show PreviewĪchema (the global forum for the chemical engineering and… Presented here is a fast and flexible solution that removes… FOCUS Focus on Pumps Use this guide to aid the selection of conveying technologies… EQUIPMENT & SERVICES APPLIED TECHNOLOGIES One-stage Filtration for Silicone Production Nickel alloys have long been the default choice for demanding… FACTS AT YOUR FINGERTIPS Facts At Your Fingertips: Alternating-Current Induction MotorsĪlternating-current (a.c.) induction motors are widely used throughout the chemical… SOLIDS PROCESSING Conveyor Selection for Bulk Solids Processes Henry Kister shares lessons learned from troubleshooting distillation towers On… FEATURE REPORT Materials of Construction: Stainless Steel Versus Nickel Alloys Presented here are practical points to help in the selection… TOWER DOCTOR Tower Doctor: A Quick Diagnosis Makes a Short Assignment The production of clinker used for making cement continues to… 'Symbiotic' electrolyzer runs on waste heatĪ new steam-fed electrolyzer aims to bridge the gap between… Chemenator BriefsĬellulosic ethanol Clariant AG (Muttenz, Switzerland has produced the… TECHNICAL & PRACTICAL More Specification Tips to Maximize Heat Transfer The olefin metathesis reaction produces new carbon-carbon double bonds by… Recycling Portland cement - emissions-free Platinum is widely used for many catalytic reactions, and because… Upcycling aerospace scrap materials into new membranesĪ new membrane for separating emulsions is being fabricated using… Iron catalyst shows promise for improving economics of metathesis reactions the advanced materials division of Semplastics… Boosting methane yields in biogas plantsīiogas plants play an important role in defossilization - anaerobic… A 'liquid' platinum catalyst outperforms solids at low temperature New design allows countercurrent heat exchange with hard-to-process slurriesĬountercurrent heat-exchange with difficult slurries, such as those of mineral… Polymer-coal composite used for building materials Transporting chemical products across global supply chains is complex and… CHEMENTATOR + Show - Hide More Plant Watch Solvay completes PVDF capacity expansion in Changshu June… NEWSFRONTS Traversing a Data-Powered Supply Chain The Green Chemistry Challenge Awards recognize scientific solutions to environmental… COVER STORY Atmospheric Pressure Releases: Which Require Dispersion Modeling?ĭispersion modeling of atmospheric releases from pressure-relief valves and other… IN THE NEWS Business News: July 2022 × COMMENTARY The 'Green' Chemistry Challenge