http://www.che.com Chemical Engineering en-us 2010 Fri, 19 Mar 2010 0:47:41 EDT Steam tracer lines are designed to maintain the fluid in a primary pipe at a designated uniform temperature. In most cases, these tracer lines are used outdoors, which makes ambient weather... http://www.che.com/facts/5489.html Mon, 1 Mar 2010 0:00:00 EST While the majority of pumps in used by the chemical process industries (CPI plants are kinetic energy pumps (the largest category being centrifugal pumps), positive displacement (PD) pumps are an important class of industrial equipment. The following is a collection of information on several types of PD pumps and an outline of the differences between positive displacement pumps and centrifugal pumps.... http://www.che.com/facts/5446.html Mon, 1 Feb 2010 0:00:00 EST Low-pressure operations are useful tools in chemical processing, as well as in research and development and manufacturing. Because of vacuums' central role in processing and research, it is important to be able to measure pressures that may be a tiny fraction of atmospheric pressure. This one-page reference discusses two types of ionization gages for low-pressure measurement, namely emitting-cathode ionization gages and crossed-electromagnetic field ionization gages.... http://www.che.com/facts/5374.html Fri, 1 Jan 2010 0:00:00 EST Installed gain graphs can help improve the selection of control valves for chemical processing. Predicting installed gain can help to increase controllability of the system and help avoid oversized valves. This one-page reference outlines the steps needed to assemble an installed gain graph.... http://www.che.com/facts/5317.html Tue, 1 Dec 2009 0:00:00 EST 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 each category and positive and negative aspects of each.... http://www.che.com/facts/5234.html Sun, 1 Nov 2009 0:00:00 EDT Corrosion is estimated to account for a significant portion — 8–10% — of total annual-plant-capital expenditures for the chemical process industries. To avoid it, engineers can consider corrosion-resistant plastics for process piping and storage vessels. Thermoplastics are generally resistant to chemical attack and thus suitable for many process applications. However, plastics must be selected based on process specifics.... http://www.che.com/facts/5159.html Thu, 1 Oct 2009 0:00:00 EDT This one page reference card covers key considerations such as the expansion tank, controls, fire resistance, heater considerations and valves... http://www.che.com/facts/5051.html Tue, 1 Sep 2009 0:00:00 EDT Successful adsorber design requires information about certain adsorbent properties, including: adsorbent densities and void fractions; isotherms or other equilibrium data; and data on mass-transfer kinetics and fixed-bed dynamics. This one-page reference sheet explains adsorbent properties and provides commonly used equations.... http://www.che.com/facts/4990.html Sat, 1 Aug 2009 0:00:00 EDT When a flowmeter is needed, the selection process should include studying the characteristics of respective measurement technologies and analyzing the advantages/disadvantages for different... http://www.che.com/facts/4924.html Wed, 1 Jul 2009 0:00:00 EDT One of the most important factors to consider when evaluating a specialty metal for use in valves, fittings and instrumentation is its corrosion resistance or corrosion rate of the metal in the target media. Each material discussed here has its own niche, and depending on the processing environment and the needs of the application, the metal’s strengths and weaknesses may or may not be suitable.... http://www.che.com/facts/4813.html Mon, 1 Jun 2009 0:00:00 EDT