For the design of a transmission piping system, a stress intensification factor (SIF) is generally used for the stress calculations of piping components due to external forces, and the solutions for the single-walled piping components can be found in the existing design codes. However, it is quite difficult to obtain the reliable estimations for pipe-in-pipes (PIPs) from the existing solutions, because the PIPs show significantly different behaviors compared to the single-walled piping components due to the restraint effect induced by the outer pipe of the PIP. In this paper, the estimation schemes for the stress behaviors of the PIPs were proposed based on the detailed finite element (FE) analyses. In order to quantify the restraint effect, the FE analyses were conducted by considering various geometric variables of the PIPs under an internal pressure and a global bending moment. Based on the FE results, the tabular and closed-form solutions of the SIFs of PIPs were newly proposed. Finally, the proposed SIF estimations were validated against numerical results.

References

References
1.
International Energy Agency
,
2012
, “
Global Energy Trends to 2035
,”
World Energy Outlook
, Organisation for Economic Co-operation and Development/International Energy Agency (OECD/IEA), Paris, France, pp.
49
78
.
2.
Korean Society of Mechanical Engineers
,
2014
, “
Theme: Trends of Development Technology for Energy Piping
,”
J. KSME
,
54
(
1
), pp.
33
57
.
3.
Markl
,
A. R. C.
,
1947
, “
Fatigue Tests of Welding Elbows and Comparable Double-Mitre Bends
,”
Trans. ASME
,
69
, pp.
869
879
.
4.
Markl
,
A. R. C.
, and
George
,
H. H.
,
1950
, “
Fatigue Tests on Flanged Assemblies
,”
Trans. ASME
,
72
(1), pp.
77
87
.
5.
Markl
,
A. R. C.
,
1952
, “
Fatigue Tests of Piping Components
,”
Trans. ASME
,
74
, pp.
287
303
.
6.
Markl
,
A. R. C.
,
1955
, “
Piping Flexibility Analysis
,”
Trans. ASME
,
77
, pp.
127
149
.
7.
Bhende
,
G.
, and
Tembhare
,
G.
,
2013
, “
Stress Intensification & Flexibility in Pipe Stress Analysis
,”
Int. J. Modern Eng. Res.
,
3
(3), pp.
1324
1329
.
8.
Bhattacharya
,
A.
, and
Long
,
D.
,
2011
, “
A Finite Element Based Study on Stress Intensification Factors (SIF) for Reinforced Fabricated Tees
,”
NAFEMS
World Congress, Boston, MA, May 23–26.
9.
ASME
,
2007
, “
ASME B31.1 Code for Power Piping
,” American Society of Mechanical Engineers, New York.
10.
ASME
,
2002
, “
ASME B31.3 Code for Pressure Piping
,” American Society of Mechanical Engineers, New York.
11.
Sriskandarajah
,
T.
,
Anurudran
,
G.
,
Ragupathy
,
P.
, and
Wilkins
,
R.
,
1999
, “
Design Considerations in the Use of Pipe-In-Pipe Systems for Hp/Ht Subsea Pipelines
,”
Ninth International Offshore and Polar Engineering Conference
, Brest, France, May 30–June 4,
SPE
Paper No. ISOPE-I-99-222.
12.
Sriskandarajah
,
T.
,
Anurudran
,
G.
, and
Ragupathy
,
P.
,
2000
, “
Finite Element Based Fracture Assessment of Hp/ttT Subsea Pipelines
,”
Tenth International Offshore and Polar Engineering Conference
, Seattle, WA, May 28–June 2,
SPE
Paper No. ISOPE-I-00-146.
13.
C-CORE
,
2000
,
An Engineering Assessment of Double Wall Versus Single Wall Designs for Offshore Pipelines in an Arctic Environment
,
C-CORE Publication
, St. John's, NL, Canada.
14.
Ziu
,
C. G.
,
1995
,
Handbook of Double Containment Piping Systems
,
McGraw-Hill
, New York.
15.
ABAQUS
,
2010
, “
ABAQUS Version 6.10, User's Manual
,” Dassault Systemes Simulia Corporation, Johnston, RI.
16.
Sun
,
E. Q.
,
2006
, “
Shear Locking and Hourglassing in MSC Nastran, ABAQUS, and ANSYS
,”
MSC Software Corporation's 2006 Americas Virtual Product Development Conference
(
VPD
), Detroit, MI, Apr. 24–26.
17.
ASME
,
2007
, “
ASME Boiler and Pressure Vessel Code Section VIII, Division 2, Part 5
,” American Society of Mechanical Engineers, New York.
18.
ASME
,
2007
, “
ASME Boiler and Pressure Vessel Code Section III, Division 1-Rules for Construction of Nuclear Facility Components
,” American Society of Mechanical Engineers, New York.
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