Process sensors and actuators provide a wealth of information about their status. The Namur recommendation NE 107 that proposes standardized, easily understandable status indicators was issued by the International User Association for Automation in Process Industries (Namur; Leverkusen, Germany; www.namur.de),…
Dry, granular solids can be conveyed in a number of ways. Two common devices for transporting granular solids are the angular-pitch vibrating conveyor and the horizontal differential-motion conveyor. The variability in the design and performance between the two types stems…
With the advent of smart or intelligent field devices, a wealth of digital information has become available. However, what does the host system do with these data? The field device transmits a bucket of bits to the host system. How…
During process operations, elevated pressure inside of isolated zones within a process or system can be rapidly reduced by the release of gas and vapor to a dedicated blowdown network. Analysis can be carried out to determine whether a given…
Calculating the volume of a liquid in a vessel of a complex shape is a common task for chemical engineers. However, there are several difficulties associated with accurately carrying out this calculation. In my own experience as a chemical engineer,…
Minimizing process variability is an important component of a plant’s profitability. The performance of control valves within process control loops has a significant impact on maintaining consistent processes. This refresher outlines some of the important aspects of control-valve performance, including…
Inline viscosity measurements can give continuous, realtime readings of a fluid’s viscosity during processing and consequently, can provide a means to automate the viscosity control of process fluids. While it is difficult to control all factors in the process that…
Occasionally, direct fired heaters that have operated satisfactorily for long periods of time subsequent to startup develop operating problems that do not allow for operation at design conditions, as specified in the manufacturers API data sheets for the heater. Performance…
Polypropylene (PP) is one of the world’s most widely used polymers, second only to polyethylene in terms of global demand. The global market for polypropylene is over 60 million metric tons per year, and it is utilized in a…
A variety of technologies, methods and best practices are available to obtain the lowest total cost of ownership for compressors used in plants throughout the chemical process industries (CPI). This article discusses several critical areas in which concerted effort can…