Archives :: Processing & Handling :: Liquid, Gas and Air Handling

Displaying 41 - 60 of 824 stories.
March 1, 2014
How big can a fermenter get? And what would the biggest fermenter look like? The answers to these questions depend upon how the requirements of heat transfer, mass transfer (gas-to-liquid), and momentum transfer (mixing) are met. In an earlier article (Heat Transfer for Huge-Scale Fermentation, Chem. Eng., November 2013, pp. 44–46) the authors described how heat-transfer requirements can cause...
February 1, 2014
Compressible gas flow with significant variation in density along pipes is commonplace in the chemical processing industries (CPI). In designing these pipes for compressible flow, it is important to calculate the pressure loss or maximum gas-handling capacity for safety and economic reasons. Due to the complexity of the equations for compressible flow, which often require time-consuming iterations, current...
February 1, 2014
Would you like to make a quick mental calculation to determine approximate flowrate, velocity, or pipe and duct sizes for many common situations? This article presents two methods for estimating flow characteristics without the aid of charts, tables, calculators or software programs. One method applies to liquid flow in pipes, and the other to air flow in ducts. The techniques are intended to be simple...
February 1, 2014
This company has developed helium recovery units that make it possible to recover and recycle the gas used in leak detection. The recovery of used helium is useful for meeting the...
February 1, 2014
Pressure to become more flexible and provide shorter cycle times have prompted chemical processors to examine their mixing operations to determine whether there is a way to increase process efficiency via mixing equipment. And, they just might be onto something, as modern mixing systems are designed for particular process requirements and mixing tasks, allowing them to operate efficiently. The greater...
January 6, 2014
A new online Material Selection Guide is available from DeZURIK (Sartell, Minn.; This convenient web application makes it quick and easy to determine which metals or elastomers are suggested as suitable for valves in...
January 1, 2014
Pressure vessels are common in the chemical process industries (CPI) and they range widely in size and complexity. Process engineers may be tasked with inspecting a new pressure vessel or with witnessing hydrostatic testing of a vessel. In addition, engineers could be asked to witness repairs or alterations to a pressure vessel already in service, during day-to-day process and maintenance operations...
December 1, 2013
Gear units play a critical role in a diverse array of chemical process industries (CPI) facilities, to match the speed of a selected driver with the speed of the driven equipment. Today, they are used extensively in pumps, turbines and compressors, in material-handling units (such as conveyers and stackers), and in other equipment, including mixers, kneaders and extruders. This article discusses...
November 1, 2013
Working in close proximity to the high pressures and temperatures commonly found in the chemical process industries (CPI) is cause enough for concern over a person’s wellbeing; but working in close proximity to chemicals that are considered toxic, hazardous or reactive escalates that concern to a higher degree (Figures 1 and 2). The dangers of such chemicals underline the paramount importance of...
October 1, 2013
Optimizing fan performance can help plants reach overall process efficiency goals. The cost of powering fans and ventilators in the chemical process industries (CPI) is significant. For example, ventilation and air-pollution control systems can account for over a quarter of energy a facility’s consumption. Fan performance is typically estimated by using a graph that shows the different pressures...
October 1, 2013
The Kleerband Flange Protectors provide a quick and easy way to apply protection and prevent corrosion. The devices are simple to install with a worm-gear connection...
October 1, 2013
The CSD Aseptic Series of hygienic centrifugal pumps is suitable for transferring liquids in food, beverage, pharmaceutical, ultra-pure and other process applications where hygiene is critical...
October 1, 2013
The new TMP-X2905/X3405 Series of turbo-molecular pumps (TMP) has integrated power supplies and 3,000 L/s class pumping speeds for the semiconductor and flat-panel-display manufacturers. Integrating the...
October 1, 2013
Let’s face it, valves may not be the most glamorous piece of equipment in a chemical process industries (CPI) facility, but no plant can function without them. In addition, multiple challenges and issues specific to the chemical processing industry affect valves and valve performance. For these reasons, selecting the right valve — one that will stand up to the rigors and demands of the chemical...
October 1, 2013
The Type 6624 TwinPower rocker valve consumes no energy after the switching process. The standard rocker valve has two seats, which are opened and closed with electric current. They return to the...
September 1, 2013
Designed for general industrial applications, the new SLC4 (photo) and SLC8 models of the Seal-Less Drive Eccentric Disc Pumps line also handle numerous chemicals, such as isocyanates, polyols...
September 1, 2013
Chemical vapor deposition (CVD) is among the most reliable methods to produce large-area graphene films on different metal substrates with diverse carbon sources. The benchtop Thermal CVD Cube (photo) grows a bilayer...
September 1, 2013
This company has updated its range of turbopumping stations to include the newly launched nXDS dry scroll pumps. The range of turbostations now includes...
September 1, 2013
Rotary equipment, such as centrifugal pumps, often represent the heart of plants in the chemical process industries (CPI). A critical factor in the longterm reliability of such equipment is a high-quality design and commissioning process, so that initially, the rotary equipment will have the maximum built-in strength to survive upset operating conditions, yet not be overdesigned in a way that leads to...
September 1, 2013
Proper steam-trap sizing is critical to efficient and reliable steam-trap operation. Incorrect steam trap sizing can undermine the design and function of the steam trap, create installation issues, and cause condensate backup, steam loss, or both. Steam-trap sizing refers to the internal discharge orifice for condensate. Unfortunately, it is sometimes confused with the size of the end connection or piping...
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