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

Displaying 41 - 52 of 52 stories.
November 1, 2010
When tanks are draining, the potential may exist for a swirling vortex to form leading from the liquid surface to any of the bottom-exit or side-exit nozzles connected to downstream piping (Figure 1). One important aspect of the vortex is whether it will entrain air or other gases into the discharge flow. Such vapor entrainment can lead to a host of problems, ranging from vacuum collapse of the supply...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Predict-and-Prevent-Air-Entrainment-in-Draining-Tanks_6114.html
June 1, 2010
Tracing its origins to 1915, the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (the code) [1] has become the established safety standard governing the design, fabrication and inspection of boilers and pressure vessels, as well as nuclear power plant components during construction. Section VIII, Division I of the code addresses pressure vessels operating at either internal...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Decoding-Pressure-Vessel-Design_5726.html
November 1, 2009
The ultimate objective of storing liquid, fluid and gaseous products, which may be corrosive, flammable or unstable, is to store material in an environmentally safe and economically viable manner. Storage tanks in the chemical process industries (CPI) can be most broadly divided into those buried underground, and those constructed aboveground. The following is an outline of considerations associated with...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Aboveground-and-underground-storage-tanks_5234.html
October 15, 2008
This article presents the fundamental concepts of the discharge coefficient, KD, of a relief valve or a safety relief valve, and flow resistance factor, KR, of a rupture disk, and their proper use in sizing an emergency relief system. When these devices are used to protect a pressure vessel, they must be certified according to ASME code in the U.S. Both the discharge coefficient and the flow resistance...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Engineering-Practice-Discharge-Coefficients-and-Flow-Resistance-Factors_4242.html
May 15, 2008
Most common acids can be stored in horizontal or vertical ASME-type tanks, as shown in the figures to the right, or vertical API-type tanks. Horizontal, carbon-steel ASME-type tanks of 10,000 — 40,000 gal capacity should have a plate thickness of 3/8 in. with dished heads of the same thickness. The thickness includes a corrosion allowance of 1/4 in., which provides a tank life of 15 — 20 years...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Facts-at-Your-Fingertips-Acid-Storage_3864.html
February 15, 2008
The interior surfaces of your storage tanks are constantly at risk. If you walk past a tank often without giving thought to what is happening on the inside, it is because you trust the interior coating to protect not only the storage vessel, but also to protect the product being stored from any corrosion that might occur on the tank. Without a doubt, corrosion is the principal enemy of a storage vessel. It...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Tank-Coatings-Covering-the-Basics-of-Selection-and-Specification_3665.html
December 15, 2007
This article introduces a simple yet accurate way to calculate the wetted surface area of a partially filled horizontal vessel with semi-elliptical heads. This information is often needed for the sizing of relief devices. API Recommended Practice 521 specifies that a vessel containing liquid, mounted such that its lowest point is less than 7.62 m (25 ft) above ground level, must be fitted with a...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Engineering-Practice-Accurate-Wetted-Areas-For-Partially-Filled-Vessels_3562.html
October 1, 2006
    Provided that they are updated when appropriate to keep them relevant, time-tested heuristics rules based upon experience, also referred to as rules of thumb, can be useful for the design, specifying and operation of several kinds of equipment used in process plants. The first and foremost heuristic rule is that the engineer should not shy away from using heuristics - and the second rule is...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Heuristics-Rules-for-Process-Equipment_2808.html
August 1, 2006
Cleaning the inside of large storage tanks at petroleum refineries and bulk chemical facilities typically involves workers using water cannons, shovels and even mini bulldozers. Such manual labor is not only time-consuming, but places the workers at risk due to flammable and toxic vapors that may be present. A device developed by researchers at...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/This-device-reduces-manual-labor-for-cleaning-storage-tanks_2983.html
April 1, 2006
    Liquids are accumulated and stored in tanks of various shapes and sizes throughout the chemical process industries (CPI). A small number of companies have made the design, fabrication and erection of these vessels their specialty. Initially, however, it is the process engineer who sizes and specifies tanks according to a specific application’s needs. In order to develop a data sheet for...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Understanding-Atmospheric-Storage-Tanks_2791.html
April 1, 2006
Most chemical processes must produce products that are uniformly mixed. There have been many articles written about preventing particle segregation during bulk solids flow; and ensuring a mass flow pattern is a common suggestion. But mass flow alone is not necessarily the answer to all segregation problems that can occur in silos and tanks. We will focus on the two major mechanisms of segregation; namely...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Will-Mass-Flow-Solve-All-Your-Segregation-Problems_3111.html
February 1, 2006
A gas-liquid nozzle that reduces the size of the gas bubbles blown into a liquid — thus increasing the rate at which the gas is absorbed into the liquid — has been developed by a research team led by Jie Wu at CSIRO Manufacturing and Infrastructure Technology Div. (edlinks.che.com/5826-531), in collaboration with CPE Ltd (Chemical Plant & Engineering; both Melbourne, Victoria, Australia...
http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/Chementator-Reduce-gas-consumption-with-this-sparging-nozzle_2885.html
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