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Piping

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(Redirected from Pipe stress analysis)
For other uses of "Pipe", see Pipe (disambiguation).
For the textile ornament, see Piping (sewing).

Large-scale piping system in an HVAC mechanical room

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.[1][2]

Industrial process piping (and accompanying in-line components) can be manufactured from wood, fiberglass, glass, steel, aluminum, plastic, copper, and concrete. The in-line components, known as fittings,[3] 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 (or piping engineering), though the sensors and automatic controlling devices may alternatively be treated as part of instrumentation and control design. Piping systems are documented in piping and instrumentation diagrams (P&IDs). If necessary, pipes can be cleaned by the tube cleaning process.

Piping sometimes refers to piping design, the detailed specification of the physical piping layout within a process plant or commercial building. In earlier days, this was sometimes called drafting, technical drawing, engineering drawing, and design, but is today commonly performed by designers that have learned to use automated computer-aided drawing or computer-aided design (CAD) software.

Plumbing is a piping system with which most people are familiar, as it constitutes the form of fluid transportation that is used to provide potable water and fuels to their homes and businesses. Plumbing pipes also remove waste in the form of sewage, and allow venting of sewage gases to the outdoors. Fire sprinkler systems also use piping, and may transport nonpotable or potable water, or other fire-suppression fluids.

Piping also has many other industrial applications, which are crucial for moving raw and semi-processed fluids for refining into more useful products. Some of the more exotic materials used in pipe construction are Inconel, titanium, chrome-moly and various other steel alloys.

Engineering sub-fields

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Generally, industrial piping engineering has three major sub-fields:

  • Piping material
  • Piping design
  • Stress analysis

Stress analysis

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Process piping and power piping are typically checked by pipe stress engineers to verify that the routing, nozzle loads, hangers, and supports are properly placed and selected such that allowable pipe stress is not exceeded under different loads such as sustained loads, operating loads, pressure testing loads, etc., as stipulated by the ASME B31, EN 13480, GOST 32388, RD 10-249 or any other applicable codes and standards. It is necessary to evaluate the mechanical behavior of the piping under regular loads (internal pressure and thermal stresses) as well under occasional and intermittent loading cases such as earthquake, high wind or special vibration, and water hammer.[4][5] This evaluation is usually performed with the assistance of a specialized (finite element) pipe stress analysis computer programs such as AutoPIPE,[6] CAEPIPE,[7] CAESAR,[8] PASS/START-PROF,[9] or ROHR2.

In cryogenic pipe supports, most steel become more brittle as the temperature decreases from normal operating conditions, so it is necessary to know the temperature distribution for cryogenic conditions. Steel structures will have areas of high stress that may be caused by sharp corners in the design, or inclusions in the material.[10] When 3D pipe stress is analyzed, it (3D Pipes) will be considered as 3D beams with supports on both sides. Moreover, the 3D pipe stress determines the bending moments of the pipes. Allowable (ASME) Pipe grades permitted for Oil and gas industries are : Carbon Steel Pipes and tubes (A53 Grade [A & B], A106 Grade [B & C]), Low & Intermediate alloy steel Pipes (A333 Grade [6], A335 Grade [P5, P9, P11, P12, P91])

Materials

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The material with which a pipe is manufactured often forms as the basis for choosing any pipe. Materials that are used for manufacturing pipes include:

History

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Ukraine, Olbia, elements of water pipes, the beginning of our era. Mykolayiv Regional Museum of Local History

Early wooden pipes were constructed out of logs that had a large hole bored lengthwise through the center.[12] Later wooden pipes were constructed with staves and hoops similar to wooden barrel construction. Stave pipes have the advantage that they are easily transported as a compact pile of parts on a wagon and then assembled as a hollow structure at the job site. Wooden pipes were especially popular in mountain regions where transport of heavy iron or concrete pipes would have been difficult.

Wooden pipes were easier to maintain than metal, because the wood did not expand or contract with temperature changes as much as metal and so consequently expansion joints and bends were not required. The thickness of wood afforded some insulating properties to the pipes which helped prevent freezing as compared to metal pipes. Wood used for water pipes also does not rot very easily. Electrolysis does not affect wood pipes at all, since wood is a much better electrical insulator.

In the Western United States where redwood was used for pipe construction, it was found that redwood had "peculiar properties" that protected it from weathering, acids, insects, and fungus growths. Redwood pipes stayed smooth and clean indefinitely while iron pipe by comparison would rapidly begin to scale and corrode and could eventually plug itself up with the corrosion.[13]

Standards

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Stacking of a connected pipeline for transportation of oil products

There are certain standard codes that need to be followed while designing or manufacturing any piping system. Organizations that promulgate piping standards include:

See also

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References

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  1. ^ Editors: Perry, R.H. and Green, D.W. (1984). Perry's Chemical Engineers' Handbook (6th ed.). McGraw-Hill Book Company. ISBN 0-07-049479-7. {{cite book}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
  2. ^ Editor: McKetta, John J. (1992). Piping Design Handbook. Marcel Dekker, Inc. ISBN 0-8247-8570-3. {{cite book}}: |author= has generic name (help)
  3. ^ "Pipe fitting manufacturer". Yaang. Archived from the original on 27 February 2016. Retrieved 6 March 2016.
  4. ^ [1] Archived 29 May 2006 at the Wayback Machine
  5. ^ Power Piping: ASME B31.1
  6. ^ "Piping Design And Pipe Stress Analysis Software – AutoPIPE". bentley.com. Archived from the original on 9 November 2016. Retrieved 22 December 2017.
  7. ^ "SST Systems, Inc. | CAEPIPE: Fast – Efficient Pipe Stress Analysis". Archived from the original on 29 January 2010. Retrieved 27 September 2010.
  8. ^ "Intergraph CAESAR II – Pipe Stress Analysis". coade.com. Archived from the original on 2 May 2015. Retrieved 4 June 2015.
  9. ^ "PASS/START-PROF – Pipe Stress Analysis". passuite.com. Archived from the original on 8 January 2019. Retrieved 1 March 2019.
  10. ^ Temperature & Stress Analysis Archived 22 February 2014 at the Wayback Machine Piping Technology and Products, (retrieved February 2012)
  11. ^ "What is HDPE Pipe?". Acu-Tech Piping Systems. Retrieved 20 March 2019.
  12. ^ "BBC – A History of the World – Object : wooden water pipe". BBC. Archived from the original on 7 May 2016. Retrieved 10 March 2016.
  13. ^ "Piping water through miles of Redwood". Popular Science: 74. December 1918. Archived from the original on 28 December 2017.
  14. ^ H. "ASTM A252 Pipe Pile". China Huayang Steel Pipe. Archived from the original on 16 October 2014.
  15. ^ "API 5L Specification Line Pipe (1) – API Terms and Definitions". China Huayang Steel Pipe. Archived from the original on 16 October 2014.

Further reading

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