tailieunhanh - PIPELINE PIGGING TECHNOLOGY- P7

PIPELINE PIGGING TECHNOLOGY- P7: 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. | This page intentionally left blank Please purchase PDF Split-Merge on to remove this watern Gellypig technology for pipeline conversion GELLYPIG TECHNOLOGY FOR CONVERSION OF A CRUDE OIL PIPELINE TO NATURAL GAS SERVICE A CASE HISTORY INTRODUCTION When pre-commissioning a natural gas pipeline a thorough cleaning of the pipeline s internal surface is necessary to provide trouble-free gas transmission. When the pipeline was originally in crude oil service planned for conversion to natural gas the cleaning becomes even more involved and critical to the pipeline s success. Pipelines generally contain various types of debris e .g. millscale dirt rust construction debris old products etc. whether constructed of new pipe or converted from existing pipelines. This debris can result in an array of problems such as frequent filter changes reduced flow capacity higher operating expenses instrumentation fouling and concern over valve seat erosion just to name a few. Dowell Schlumberger Inc DS has performed many successful cleaning operations for both operational and pre-operational pipelines utilizing the gellypig technology developed in the early 1970s. The gellypig has been used in the North Sea Saudi Arabia South America the United States and many other regions of the world with excellent results. Pipelines have ranged from 4 to 36in diameter from a few miles to hundreds of miles in length and in a wide variety of services . natural gas crude oil products etc. . Dowell Schlumberger was contracted by Missouri Pipeline Co in the USA to perform gellypig services for its St. Charles project a newly-acquired loop line which would be converted to natural gas service from a previously-abandoned crude oil line. 163 Please purchase PDF Split-Merge on to remove this waterr Pipeline Pigging Technology BACKGROUND The Project for Missouri Pipeline Co involved converting the existing 12-in loop pipeline to natural gas service. The original .