http://www.che.com Chemical Engineering en-us 2013 Wed, 19 Jun 2013 10:12:50 EDT Dry gas seals provide a good alternative to traditional oil-lubricated wet seals for many compressor applications. Typically, these devices use process gas to prevent seal wear. However, when the process gas cannot be used, nitrogen provides a suitable alternative. This article discusses issues that must be considered when using nitrogen to prevent seal face wear in dry gas seals... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/compressors/10582.html Sat, 1 Jun 2013 0:00:00 EDT Precise volume-determination equations are readily available for common vessel shapes. But what if you are using a vessel that is a vertical cylinder with a hemispherical top and bottom? Or, what if you are working with a horizontal elliptical vessel with concave heads? No matter the type of vessel you are working with, chemical engineers need to account for the liquids within these irregular shapes to calculate the volume properly... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/tanks_and_vessels/10573.html Sat, 1 Jun 2013 0:00:00 EDT Compressors are a workhorse of the CPI. A variety of technologies, methods and best practices are available to obtain the lowest cost of ownership for compressors used in process plants. Follow the guidance presented here to get the best value from each compressor over the life of the unit... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/compressors/10473.html Wed, 1 May 2013 0:00:00 EDT This company’s magnetic-drive pumps now exceed driving power of 515 kW, with flowrates of 3,500 m3/h, delivery heads of 160 m and system pressures from PN 16 to 400. They can operate at temperatures of... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/pumps/10478.html Wed, 1 May 2013 0:00:00 EDT The Hydro-Cell Metering Solutions line is comprised of six metering pumps ranging in capacity from 0.32 to 894.6 gal/h (1.21 to 3,386.4 L/h), with pressure ratings from 50 to 2,599 psi (3.4–172 bars). These pumps use variable frequency-drive... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/pumps/10486.html Wed, 1 May 2013 0:00:00 EDT Since 1962, this company has been manufacturing horizontal and vertical centrifugal pumps to handle corrosive and abrasive fluids. The pumps are made of various thermoplastics (PP, PVDF, PE-UHMW, PFA, PTFE) or stainless steel... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/pumps/10490.html Wed, 1 May 2013 0:00:00 EDT At AchemAsia, this company launched the new extrex EA, a localized extrusion pump suitable for most extrusion applications, delivering a differential pressure of up to 200 bars. The pumps are assembled in the company’s new facility in Shanghai... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/pumps/10493.html Wed, 1 May 2013 0:00:00 EDT The performance of control valves within process control loops has a significant impact on maintaining consistent processes. This one-page refresher outlines some of the important aspects of control-valve performance, including parameters of both static and dynamic response... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/10469.html Wed, 1 May 2013 0:00:00 EDT For 40 years, this company has developed and manufactured bellows-sealed globe valves (photo) for hazardous applications in the chemical, petrochemical and nuclear industries. The... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/10492.html Wed, 1 May 2013 0:00:00 EDT The EasiDrive portable valve actuator effortlessly opens and closes valves in petroleum refineries, power plants, paper mills and chemical processing plants. Generating a torque of up to 2,000 Nm, this tool enables a... http://www.che.com/processing_and_handling/liquid_gas_and_air_handling/valves/10494.html Wed, 1 May 2013 0:00:00 EDT