tailieunhanh - PIPELINE PIGGING TECHNOLOGY- P15

PIPELINE PIGGING TECHNOLOGY- P15: Why pig a pipeline? This paper introduces a number of reasons for doing so, together with a discussion of the advantages and alternatives. In general terms, however, pigging is not an operation to be undertaken lightly. There are often technical problems to be resolved and the operation requires careful control and co-ordination. | Pipeline Pigging Technology There were also five tests performed with a misaligning flange installed in the transit spool. The VetcoLog intelligent pig was tested once with a 5 offset in the misaligning flange and twice with a 10 offset. The TDW dual-diameter 14 x 10 scraper pig and the Knapp Polly Pig dual-diameter 14 x 10 gauging pig were also tested once each with a 10 offset. CONCLUSIONS The test results showed that all of the pigs tested can pass through the symmetric wye fitting geometry without problem and without damage to the pig or the fitting. Moreover the successful passing of each type of pig was demonstrated under a wide range of flowing conditions i .e. pig velocities and flow conditions in the opposite inlet. The tests using air with the short light pigs such as the foam pigs and spheres show that concerns over stalling pigs with high by-pass potential can be eliminated by simply undercutting the inside of the fitting. For these types of pigs it is recommended that the ID of the fitting be enlarged to remove at least one-half of the pig squeeze just prior to the crotch area. This generally amounts to approximately a 2-4 increase in the wye fitting ID in the undercut region. The test results presented in this paper are exclusively for 10-in pigs and for dual-diameter 14 x 10 pigs passing through a lOin x lOin x lOin piggable wye. Additional testing is required over a range of other sizes before the results can be generalized for all sizes. There are a large number of pigs used routinely in pipeline construction and production operations that have not been tested. Therefore additional tests are recommended to extend the conclusions to other pigs. Specifically of interest are the other large heavy intelligent pigs such as the British Gas On Line Inspection pig and the Tubescope Linalog pig. ACKNOWLEDGEMENTS The authors wish to thank Transcontinental Gas Pipe Line Corporation HydroTech Systems Inc Conoco Inc and their joint interest owners in the .

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