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Technical Brief

A Simple Methodology of Pipe Route for Providing Enough Flexibility

[+] Author and Article Information
Fukun Lai

AFGlobal Corporation,
945 Bunker Hill Road, Suite 500,
Houston, TX 77024
e-mail: f.lai@afglobalcorp.com

Alex MacGregor, Justin Fraczek

AFGlobal Corporation,
945 Bunker Hill Road, Suite 500,
Houston, TX 77024

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 27, 2017; final manuscript received December 1, 2017; published online January 24, 2018. Assoc. Editor: Hardayal S. Mehta.

J. Pressure Vessel Technol 140(2), 024501 (Jan 24, 2018) (4 pages) Paper No: PVT-17-1116; doi: 10.1115/1.4038900 History: Received June 27, 2017; Revised December 01, 2017

Flexibility is the most important requirement of the pipe system. A general approach is to include pipe bends in the system to provide flexibility. The design of the pipe routing requires either rigorous pipe stress analysis or hand calculation based on the beam theory and finite element method. In this paper, a simple methodology has been developed for pipe routing to provide flexibility to absorb thermal expansion and other secondary displacements. The method uses the basic theory of beam and based on the data fitting from the pipe stress analysis results. This method provides general and simple equations of the common bends in the pipeline industry including L, Z, and U bends, for determination of the minimum length requirement for enough flexibility.

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References

Nayyar, M. L. , 2000, Piping Handbook, McGraw-Hill, New York. [PubMed] [PubMed]
M W Kellogg Company, 2009, Design of Piping Systems, Martino Publishing, Eastford, CT.
Peng, L.-C. , and Peng, T.-L. , 2009, Pipe Stress Engineering, American Society of Mechanical Engineers, New York. [CrossRef]
ASME, 2001, “ASME Code for Pressure Piping, B31,” American Society of Mechanical Engineers, New York.
ASHRAE, 2008, 2008 ASHRAE Handbook: Heating, Ventilating, and Air-Conditioning Systems and Equipment, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, GA.

Figures

Grahic Jump Location
Fig. 7

U bends relationship for different OD of pipes

Grahic Jump Location
Fig. 6

Z bends relationship for different OD of pipes

Grahic Jump Location
Fig. 5

L bends relationship for different OD of pipes

Grahic Jump Location
Fig. 4

Data fitting for U bend

Grahic Jump Location
Fig. 3

Data fitting for Z bend

Grahic Jump Location
Fig. 2

Data fitting for L bends

Grahic Jump Location
Fig. 1

The pipe loop for flexibility

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