Processing Line Pipe

Wire insulation, chemical ware, pipe lining, pipe, process equipment lining... 

Polychloro- trifluro- ethylene (CTFE) 1938 H E VG VG VG VG Molded by all conventional techniques Wire insulation, chemical ware, pipe lining, pipe, process equipment lining... 

Bearing retainers, tanks, tank linings, pipe, valves, process equipment... 

The lining sheet is prepared by calendering in thin plies up to 1 mm in thickness, followed by combining the individual layers on the calender to form a finished sheet, usually between 3 mm and 6 mm thick. Alternatively, lining sheet can be manufactured by the roller die process in which the sheet is extruded and then passed through rollers to give the finished thickness. Extrusion is also used for the preparation of unvulcanised rubber tubes suitable for lining pipes up to 200 mm in diameter. 

Fire water lines within process unit areas feeding more than two monitors, hose reels, or hydrants, should be connected to two separate sections of the fire main and separated by a valve in the main. Piping to hose reels and monitors should contain an isolation valve. 

In the chemical process industry it is often used in chlorine/caustic environment in cell covers, outlet boxes, lined pipes (see Figure 4.25), and tanks. In the pulp and paper industries pipes and scrubbers for bleaching agents are lined with ECTFE. Powder-coated tanks, ducts, and other components find use in semiconductor and chemical process industries (see Figure 4.26). Monofilament made from ECTFE is used for chemical-resistant filters and screens.58... 

The process for manufacturing seamless line pipe is shown schematically in Figure 5.8. In this process, a heated metal cylinder is pierced and then formed into the proper diameter and wall thickness. Seamless pipe is available through 26 in. (660 mm) diameter, but it is normally used only up to 16 in. (405 mmi diameter. Although seamless line pipe is the most expensive (15 to 25% above ERW), it is the most reiitable Even so, failures do occur. Hydrostatic test records reveal that about one failure occurs every 500 mu (800 km) of test. Some mills produce seamless pipe that has a significantly higher failure rate thus, it is important to ensure adequate quality control. 

The process for manufacturing helical seam line pipe (previously called spiral weld) is shown schematically in Figure 5.9. As in ERW pipe, steel strip in coil form is used, but the coil is formed into a spiral. The seams are welded by the DSAW process as in UOE pipe. Some early prejudice against helical... 

Four appendixes are included. Appendix A contains standard materials selection used by many refiners and contractors in petroleum processing equipment. Appendix B contains a rules of thumb overview of refinery materials of construction. Appendix C contains background information on hydrogen diffusion through vessel walls, and Appendix D contains a standard specification for steel line pipe. 

Large quantities of PTFE are used in the chemical industry in fluid-conveying systems as gaskets, seals, molded packing, bellows, hose, and lined pipe [11] and as lining of large tanks or process vessels. PTFE is also used in laboratory apparatus. Compression-molded parts are made in many sizes and shapes (Figure 4.13). 

Odawara, O., Long ceramic-lined pipes produced by a centrifugal-thermite process. J. Am. Ceram. Soc., 73,629 (1990). 

Particular applications of coal tar-epoxy coatings related to concrete and metal protection include tank linings, pipes, foundations in aggressive soils, manholes, sewage works, effluent plants, chemical processing plants and dock and harbour installations. 

Shawn Testone Product Manager, De Dietrich Process Systems (Glass Piping and Glass-Lined Piping)... 

Use Wire and cable insulation, pipe linings, lining for processing equipment. Fibers are used for filtration screening and mist separators. 

Use Fluid-bed coating, tank linings, piping, valves, laboratory equipment, chemical processing equipment. 

Chlorinate Polyether 1959 M+ A VG VG VG VG Injection, compression, transfer or extrusion molding Bearing retainers, tanks, tank linings, pipe, valves, process equipment... 

The conveying pipes may be made of materials compatible with the processed liquid rubber hose or suitably lined pipes are serviceable for corrosive fluids. Sharp bends are to be avoided. 

Pipe and tubing are made from many materials, including metals and alloys, wood, ceramics, glass, and various plastics. Polyvinyl chloride, or PVC, pipe is extensively used for water lines. In process plants the most common material is low-carbon steel, fabricated into what is sometimes called black-iron pipe, Wrought-iron and cast-iron pipes are also used for a number of special purposes. 

Lined piping and components can be made by one of the following processes ... 

An investigation of the failure indicated that the lined pipe transported a process stream containing hydrofluoric acid (HF). Normal practice requires the use of perfluoropol5mier-lined pipe, e g., PTFE or PFA, neither of which are expected to be attacked by HF in the process stream. The rational question to ask is Is the liner actually a perfluoropolymer This question can be answered by performing infrared spectroscopy and differential scanning calorimetry on a sample of the liner. 

The specifications include a print of the process flow diagram showing special piping materials such as glass-lined pipe, alloy pipe, high-pressure pipe, corrosion allowances, etc. 

Practically all process screw-end valves are threaded by the American Standard Pipe Thread. Special threads include the API line-pipe thread and other special purpose threads. 

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