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Mixing: Impeller Performance in Stirred Tanks

Characterizing mixer impellers on the basis of power, flow, shear and efficiency Mixing has been defined as “the application of mechanical motion in order to create fluid dynamic effects that achieve a desired process result” [1]. The process result is…

Reboiler Circuit Debottleneck with No Hardware Changes

 With a thorough investigation and proper problem diagnosis, an entire gas plant limited by a deethanizer reboiler circuit was successfully debottlenecked This article describes a case study of a gas plant (designed by others) that was bottlenecked by the reboil…

Rupture Discs: Effectively Minimize Leaks and Emissions

When installing rupture discs, there are several mechanical and operational considerations for reducing the likelihood of leaks and fugitive emissions Overpressure relief systems consisting of rupture discs and relief valves are vital for preventing damage and injury within chemical processing…

Proper Sizing and Installation for Steam System Safety Valves

Successful operation of safety valves in steam systems requires careful adherence to established industry standards for installation and design One of the most critical safety devices in a steam system is the safety valve. Figure 1 is an illustration of…

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Practical Solutions to Modular Project Execution

Follow this guidance to improve results on capital projects The opportunities for modularizing industrial and chemical projects are growing at an amazing pace. Once considered a mitigation strategy only for projects in remote areas with harsh climatic conditions or a…

Selection of Severe Service Valves

Severe service valves (SSVs) differ from general purpose valves in important ways. Presented here is guidance on how to increase service life, reduce costs and improve safety and environmental performance of SSVs Severe service valves (SSVs) are often identified by…

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Storage Tanks: Heating and Cooling System Design

Various heating or cooling options are described here, along with the factors and design parameters that need to be considered. A sample calculation regarding coils is included Tanks constitute important equipment in the chemical process industries (CPI). Various types of…

Crossflow Membrane Filtration Essentials

Several aspects of crossflow membrane filtration, including process design, equipment selection and control, are detailed here A membrane, also referred to as a semipermeable membrane, is a thin layer of material that selectively passes one or more components of a…

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Gas-Phase Filtration Media Properties: What to Know

There are many physical properties that can impact the ultimate performance of adsorbent media in gas-phase filtration applications Gas-phase filtration media specifications may list numerous physical parameters, such as shape, moisture content, bulk density, impregnation level, size and hardness (crush…

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Eye Protection, Part 1: Beyond Basic Eye Safety

How to protect, preserve and enhance workers’ safety Safety eyewear (Figure 1) is among the most prevalent types of personal protective equipment (PPE) worn across the chemical process industries (CPI). It protects an individual’s most valuable sense — vision —…