Piping
9/16/2008
“Within industry, piping is a system of pipes used to convey fluids
(liquids and gases) from one location to another. The engineering discipline of
piping design studies the efficient transport of fluid.”
Wikipedia:
http://en.wikipedia.org/wiki/Piping (11/21/2008)
Warning: Sometimes the older links no longer work. Go to the US Patent number search page, copy the Patent number into the search box and search. For the articles, use your browser to go the Journal site.
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Notes
“Industrial process piping (and accompanying in-line components) can be
manufactured from wood, glass, steel, aluminum, plastic, copper, and concrete.
The in-line components, known as fittings, valves, and other devices, typically
sense and control the pressure, flow rate and temperature of the transmitted
fluid, and usually are included in the field of piping design. Piping systems
are documented in Piping and Instrumentation Diagrams. If necessary, pipes can
be cleaned by the tube cleaning process.”
Wikipedia:
http://en.wikipedia.org/wiki/Piping (11/21/2008)
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“Nowadays, pipes of polymer material are frequently used for various purposes, such as fluid transport, i.e. transport of liquid or gas, e.g. water or natural gas, during which the fluid can be pressurised. Moreover, the transported fluid may have varying temperatures, usually within the temperature range from about 0.degree. C. to about 50.degree. C. Such pressure pipes are preferably made of polyolefin plastic, usually unimodal ethylene plastic such as medium density polyethylene (MDPE; density: 0.930-0.942 g/cm.sup.3) and high density polyethylene (HJPE; density: 0.942-0.965 g/cm.sup.3). By the expression "pressure pipe" herein is meant a pipe which, when used, is subjected to a positive pressure, i.e. the pressure inside the pipe is higher than the pressure outside the pipe.
Polymer pipes are generally manufactured by extrusion, or, to a smaller extent, by injection moulding. A conventional plant for extrusion of polymer pipes comprises an extruder, a die-head, a calibrating device, cooling equipment, a pulling device, and a device for cutting or for coiling-up the pipe.
The manufacture of PE materials to be used in pressure pipes is discussed in an article by Scheirs et al (Scheirs, Bohm, Boot and Leevers: PE100 Resins for Pipe Applications, TRIP Vol. 4, No. 12 (1996) pp 408-415). The authors discuss the production technology and properties of PE100 pipe materials. They point out the importance of proper comonomer distribution and molecular weight distribution to optimise the slow crack growth and rapid crack propagation.”
Aarila and Backman. US Patent 7,416,686 (8/16/2008)
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Reveiw Articles
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US Patents
11/4/2008
7,445,031
Insulation arrangement for pipes, in particular for pipes in a pneumatic system
on a passenger aircraft
7,445,030
Flexible tubular pipe, especially for oil production, having a PTFE winding
10/28/2008
10/14/2008
7,435,466
Polytetrafluoroethylene-based-resin tube and production method thereof
8/26/2008
7,416,686
Polymer composition for pipes
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Journal Articles
10/24/2008
Analysis of a carbon composite overwrap pipeline repair system
(782-788)
International Journal of Pressure Vessels and Piping 85 #11 (2008)
(Titles and Abstracts)
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Roger D. Corneliussen
Editor
Telephone: 610 883 0055
rcorneliussen@4spe.org
www.maropolymeronline.com
Copyright 2008 by Roger D. Corneliussen