Advertisement

Journal of Failure Analysis and Prevention

, Volume 18, Issue 6, pp 1554–1561 | Cite as

Thermal Analysis of Buried Insulated Pipes

  • S. AfshanEmail author
  • A. Pettinger
Technical Article---Peer-Reviewed
  • 38 Downloads

Abstract

This paper evaluates the temperature distribution along the pipe–soil interface of a polyurethane insulated steel carrier pipe with a polyethylene jacket used to transport up to 160 °C hot oil emulsion in conditions typically encountered in the Boral forests of Canada. The evaluation includes a parametric study using finite element models of these buried pipes and the development of a pipe–soil interface temperature relationship, to quantify the dependence on insulation thickness, pipe cover depth, carrier pipe diameter, and emulsion temperature. The derived temperature along the pipe–soil interface follows a sinusoidal distribution with the maximum temperature occurring at the bottom of the pipe and the minimal temperature at the top of the pipe as heat is conducted to the cooler-free ground surface. The benefit of this analytical expression is that classical heat transfer analysis can now be utilized to evaluate similar systems as the coupling with the soil has now been explicitly stated for variations in pipe diameter, cover depth, insulation thickness, and emulsion temperature. The paper also discusses the usage of this pipe–soil interface temperature relationship in the design of insulated pipes and provides some design guidelines for these pipe systems.

Keywords

Buried insulated pipes Heat transfer analysis Polyurethane insulated pipe Finite element analysis District heating pipes Insulated pipe design Pipe temperature distribution 

References

  1. 1.
    M. Batallas, P. Singh, Evaluation of anticorrosion coatings for high temperature service, in NACE Corrosion Conference and Expo (2008)Google Scholar
  2. 2.
    M. Batallas, P. Singh, Determining the performance of polyurethane foam pipe insulation for high temperature service, in NACE Northern Area Western Conference, Calgary, Alberta (2006)Google Scholar
  3. 3.
    R. Besier, Quality test on system components. Testing of pre-insulated bonded pipe fittings. EuroHeat & Power (English Edition) 6(1), 34–49 (2009)Google Scholar
  4. 4.
    S. Werner, District heating and cooling in Sweden. Energy 126, 419–429 (2017)CrossRefGoogle Scholar
  5. 5.
    C. Persson, Predicting the long-term insulation performance of district heating pipes, Ph.D. thesis, Göteborg: Chalmers Univ. of Technology (2015)Google Scholar
  6. 6.
    V. Schmidt, Erdverlegte Mantelrohrsysteme, werksmäßig mit PUR-Hartschaumstoff hergestellt. (Buried pre-manufactured jacketed pipeline systems of PUR foam), Fernwärme international—FWI, District Heating, 9 Jahrgang, Heft 1, (1980) (German).Google Scholar
  7. 7.
    P. Stovall, Closed Cell Foam Insulation: A Review of Long Term Thermal Performance Research. Oak Ridge National Laboratory, ORNL/TM-2012/583, 2012Google Scholar
  8. 8.
    R. Freeman, Predicting and qualifying the long-term behaviour of polyurethane foam in sub-sea pipe-in-pipe systems, in International Conference on Pipeline Protection, Paphos, Cyprus (2005)Google Scholar
  9. 9.
    F. Incropera, D. DeWitt, Fundamentals of Heat and Mass Transfer, 3rd edn. (Wiley, New York, 1990)Google Scholar
  10. 10.
    Vedat S. Arpaci, Conduction Heat Transfer, abridged edn. (Ginn Press, Needham Heights, 1991)Google Scholar

Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.Engineering Systems Incorporation, ESIHoustonUSA
  2. 2.Engineering Systems Incorporation, ESIIrvineUSA

Personalised recommendations