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ASNT NDT Level III
(No. 231157)

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The Differences between Process and Power Piping

on Tue 10 Jun 2014, 00:17
Within many industries, piping is defined as a system of pipes used to convey fluids from one location to another. The terms “process” and “power piping” typically refer to any type of piping that is put to use in an industrial facility whose function is to convey the materials used for the manufacturing processes. However, there are a few differences between process and power piping.

Process piping

Process piping is a form of pipework used for the transportation of materials in industrial manufacturing. It is designed for particular application to ensure that it meets appropriate safety standards as well as suiting the needs of the manufacturing process it is designed for. Process piping can be installed by plumbers or contractors who specialize in installing factory components, yet like other fixed components in a factory, process piping is subject to inspection and approval by the government. Process piping is used in a variety of different ways and is built in many different materials. An important consideration is made for special needs manufacturing where special piping including inert glass or ceramic is used for transporting specific chemicals or materials like water.

Power piping

Process and power piping are similar in that they are both used in industrial settings to transport materials used in the manufacturing process, however power piping is used specifically under the guise that the materials in transport may be under high pressure. Most often, power piping is used in conjunction with a boiler. A boilermaker or someone certified in R-stamp welding is utilized to create a power piping process, since the welding, fitting and installing of the tubes and accessories that attach to the boiler need to be specially crafted. Power piping is specially crafted to withstand stress fractures, rust, and corrosion often associated with piping that operates with very high steam pressures.

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Power and Process Piping Codes and Standards

on Tue 10 Jun 2014, 00:26
Power piping means piping systems and their component parts, that are not building services piping systems, and that may be installed within electric power generating stations, industrial and institutional plants, utility geothermal heating systems, and central and district heating and cooling systems. Power piping includes, but is not limited to, piping used in the distribution of plant and process steam at boiler pressures greater than fifteen pounds per square inch gauge, high temperature water piping from high pressure and high temperature boilers, power boiler steam condensate piping, high pressure and high temperature water condensate piping, and compressed air and hydraulic piping upstream of the first stop valve off a system distribution header.

Process piping means piping systems and their component parts, that are not building services or power piping systems, and that may be installed in petroleum refineries, chemical, pharmaceutical, textile, paper, semiconductor, and cryogenic plants, and related processing plants and terminals.

ASME B31.1 - Power Piping - 2012 Edition
This code contains requirements for piping systems typically found in electric power generating stations, industrial institutional plants, geothermal heating systems, and heating and cooling systems.

ASME B31.3 - Process Piping - 2012 Edition
This Code contains requirements for piping typically found in petroleum refineries; chemical, pharmaceutical, textile, paper, semiconductor, & cryogenic plants, & related processing plants terminals.
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