The use of Polymer Materials as Foundations of Oil and Gas Pipelines
The design of heat - insulated supports (pillows) from modified polyurethane used as the pipeline foundations is considered as relevant for the construction of oiland gas pipelines laid on permafrost soils. A comparative analysis of the currently used pipeline supports for underground laying, such as ground (sand) bedding,reinforced concrete blocks, damping padding of PCM (polymer composite material), is presented. The results of laboratory studies of pillows made of modifiedpolyurethane for resistance to mechanical stress, including cyclic, are presented. The dependences of the load on the relative deformation of the FPU sample,the results of the test of polyurethane foam on the stabilization of mechanical characteristics, as well as the results of the study of the hysteresis of compressionreleaseof samples are given. The estimation of physical and mechanical properties of FPU composition under the condition of low temperature of the casting mold and moisture ingress into the mold (at the time of pouring) is presented.