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Research Papers: Pipeline Systems

# Calculating the Optimum Angle of Filament-Wound Pipes in Natural Gas Transmission Pipelines Using Approximation Methods

[+] Author and Article Information

Associate Professor
Mechanical engineering Department,
University of Tabriz, Tabriz, Iran
e-mail: rkhosh@tabrizu.ac.ir

Ali Akbar Emami Satellou

Student
e-mail: aa_emami@nigc-dist8.ir

Professor
e-mail: shishesaz@yahoo.com
Mechanical engineering Department,
Ahvaz, Iran

Bahram Salavati

Iranian Gas Engineering
and Development Company,
Tehran, Iran
e-mail: Salavati_b@yahoo.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 10, 2012; final manuscript received May 20, 2012; published online March 18, 2013. Assoc. Editor: Saeid Mokhatab.

J. Pressure Vessel Technol 135(2), 021702 (Mar 18, 2013) (7 pages) Paper No: PVT-12-1033; doi: 10.1115/1.4007189 History: Received March 10, 2012; Revised May 20, 2012

## Abstract

Given the increasing use of composite materials in various industries, oil and gas industry also requires that more attention should be paid to these materials. Furthermore, due to variation in choice of materials, the materials needed for the mechanical strength, resistance in critical situations such as fire, costs and other priorities of the analysis carried out on them and the most optimal for achieving certain goals, are introduced. In this study, we will try to introduce appropriate choice for use in the natural gas transmission composite pipelines. Following a 4-layered filament-wound (FW) composite pipe will consider an offer our analyses under internal pressure. The analyses’ results will be calculated for different combinations of angles 15 deg, 30 deg, 45 deg, 55 deg, 60 deg, 75 deg, and 80 deg. Finally, we will compare the calculated values and the optimal angle will be gained by using the Approximation methods. It is explained that this layering is as the symmetrical.

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## References

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## Figures

Fig. 1

Four-layerd FW composite pipe in cylindrical coordinates

Fig. 2

Relation of coordinate system between principal material axis and cylindrical axes

Fig. 3

Average radial displacement for (±15)3, (±30)3, (±45)3, (±55)3, (±60)3, (±75)3, and (±80)3

Fig. 4

Average radial displacement for different combinations of angles 15 deg, 30 deg, 45 deg, 55 deg, 60 deg, 75 deg, and 80 deg

Fig. 5

Values of ɛ0 for (±15)3,(±30)3, (±45)3, (±55)3, (±60)3, (±75)3, and (±80)3

Fig. 6

Values of ɛ0 for different combinations of angles 15 deg, 30 deg, 45 deg, 55 deg, 60 deg, 75 deg, and 80 deg

Fig. 7

Approximation graph for Eq. (21)

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