Experimental investigation of technologie of pipelines thermal protection by monolithiс foam concrete

Heat supply, ventilation, air conditioning, gas supply and lighting

As the technology of heat insulation with using monolithic foam concrete is relatively new, after preliminary calculations, and before mass use by a group of scientists and engineers, which included the author of articles, under the guidance of Ph. D. V.D. Vasiliev< in 2007-2008 were conducted field experiments. According to the proposed technology, the insulated pipe centralizers are installed on which is mounted a removable or fixed timbering. The ends are sealed, and through technological holes in the formwork is filled with solid foam concrete. The technique is to perform a thermal finite linear and curved sections of the pipeline monolithic foam concrete of different densities using different materials and permanent form of various materials centralizers. At the same time ease the implementation rated insulation antivandal shuttering its strength and quality. This series of experiments, was and is far from the latest experiments in this field. However, it was after these experiments revealed the following, the most popular combinations of formwork and centralizers:

- Combination of steel centralizers and steel formwork provides the best protection functions, long service life, very fast and technically easy going on the pipeline is suitable for reconstruction, and for the construction of new pipelines.

- Combination of steel centralizers and design of metal mesh and tar paper provides good protective function, long service life, quickly installed on the pipeline is suitable for reconstruction, and for the construction of new pipelines. 

- Construction of centralizers of hollow PVC products can not be used to heating mains and steam but may find its application in the insulation of pipeline with the temperature of the working body is not more than 50 C. 

- Construction of centralizers of SPE disks have shown themselves well in the course of the experiments, and during follow-up within 180 days showed no changes in the geometry of centralizers, rot and mildew. But since there are fears that the periodic changes of temperature in real heat conductor such phenomena are possible, the construction of a disk of SPE was not used in further experimental shading, there is not data on the behavior of such structures, and the direction needs to be further developed.