Inserção de tubulação metálica para GLP sobre roletes mancalizados revestidos com mateiral polimérico : avaliação da força requerida e perdas observadas

Abstract:

This work analyses the forces and observed losses on the insertion of pipelines for liquified petroleum gas (LPG) transportation through rock excavated tunnel, with 3% slope, over bearing mounted rollers coated with a thick layer of polymeric material. On the pipeline simulated design there are two metallic pipelines, running parallel to each other, each one with an external diameter of 762 mm (30”) and thickness of 19 mm, consisting of 12 m length pipe segments welded to each other, forming a single piece with a total length of 5,100 m. Each pipeline is supported by 340 metal supports spaced 15 m apart. On each of these supports there is a polymeric coated roller, running on two roller bearings, which centralizes and guides the pipe, along the tunnel, during insertion. The roller is externally coated with a thick layer of polymeric material to prevent damaging the protective coating of the pipe during operation. For laboratory simulation of the relevant conditions on the insertion process, a special dynamic testing device has been conceived, designed and manufactured which emulates the pipe linear insertion and the radial load over the coated rollers. To measure the torque applied to the main spindle of the dynamic testing device a torque measuring system has been developed including a strain gauged shaft and signal conditioner, collector and digitizer. The torque sensor was designed to measure up to 3500 Nm on both rotating directions The results obtained show that the polymeric coated rollers were not effective in avoiding the damage to the pipe external surface protection and increase significantly the necessary force for pipe insertion.


Reference:
VIDAL, Alfredo Demetres; LOPES, Luiz Eduardo; CALAPODOPULOS, Yannis. Inserção de tubulação metálica para GLP sobre roletes mancalizados revestidos com mateiral polimérico : avaliação da força requerida e perdas observadas. In: RIO OIL & GAS EXPO AND CONFERENCE, 2014, Rio de Janeiro. Anais… Rio de Janeiro: IBP, 2014. 10 p

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