Pre-Insulated Pipe Failure?

[stanier]

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?

 

[quark]

Stanier!

If I have to correctly put it, it should not be strong enough but should be flexible enough.Generally PUF is used for packing extremely delicate material for its shock resisting capability.The compressibility factor of PUF is very good. Sometime back I had the data with me but lost it. Anyhow I will check it.

In brief there should not be any problem.

Regards,