District Heating or Cooling

From: <Geoff>
Date: Tue Sep 24 2002 - 20:20:00 EDT

I have a question related to the structure of pre-insuulated pipes and how they behave as a result of thermal strains.

I am curious to know with the foam pre insulated pipe systems what happens to the foam when the inner pipe expands greater than the outer sheath of say PE. Does the foam fracture or is it strong enough to withstand the stresses involved. Is the adhesion of the foam to the outer sheath or inner pipe strong enough to withstand the shear? If the inner pipe moves in respect of the outer sheath does it crush the foam at changes of direction? Do you have to put expansion bellows in the system?

What experience have forum members in the use of these materials?

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Design Detail and Development (a division of Blenray Pty Ltd) We specialise in pipe network and waterhammer analysis, pipe stress analysis, the design of buried pipelines and thermoplastic pipe systems. Local tel 0402 35 2313 fax 02 8850 2313
Overseas tel 61 402 35 2313 fax 61 2 8850 2313 Mail Address PO Box 1351 Castle Hill NSW 1765 Australia

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