Tài liệu PIPELINE PIGGING TECHNOLOGY- P14 doc

Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. [...]... examine the lateral pipeline Prior to the introduction of piggable wye fittings, on many gathering systems it was necessary to bring the pipeline to a platform, up a riser and into 385 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology Fig.l Symmetric piggable wye a pig receiver The product was then inter-connected with another pipeline and a launcher... AJ.Grass, 1990 Piggable pipeline wye connection - Development and design, Advances in subsea pipeline engineering and technology, Kluwer Academic Publishers, pp 207-228 383 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm This page intentionally left blank Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pigging through Yfittings PIGGING CHARACTERISTICS... with the pipeline and need only a small protection cover Their main application is for tying-in smaller-diameter pipelines They are not readily piggable and would require specialist techniques such as gel or foam slugs, or a subsea pig trap Fig.9 illustrates a subsea pig trap for a gas pipeline The deployment, operation and retrieval of this device would be a costly exercise unsuited to routine pigging. .. remove this waterm Pigging through Y fittings Fig.2 Non-symmetric piggable wye Qualitative results are also presented and discussed in relation to general observations and pigging characteristics that may be useful in designing and/ or operating pipeline systems with piggable lateral connections Design of the piggable wye fitting as a pressure vessel and structural element of the pipeline system is... differential pigging pressure are more useful parameters and better characterize pig performance TEST PROCEDURES For water-driven pigging tests, the following basic procedures were followed: 1 The air tank was pre-charged to the desired pressure (charging pressure varied between 50-125psi depending on the flow rate) 393 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging. .. all of the pigs that were tested 2 At low pigging speeds, i.e less than 1.35ft/sec, the peak differential pigging pressure in the wye appears to increase when medium to high flow occurs on the opposite side 3 At high pigging speeds, the short, light, single-module pigs pass through the fitting without difficulty and generally require less peak differential pigging pressure in the wye than in the transit.. .Pipeline Pigging Technology Flow limitations: To ensure the passage of pigs through the wye, there has to be adequate flow in the main line and no reverse flow in the branch For a pipeline system which needs periodically to be coated by a slug of corrosion inhibitor held between two batching... However, pigging through the lateral inlet requires negotiating an angle that is twice as severe as for the symmetric wye fitting for a given angle between inlets It should be noted that several other geometries have been used for fabricated wye fittings For example, Ref 6 describes a 12-in application for 387 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging. .. reasons for differential pigging pressures to increase inside the fitting on multiple-module pigs It should be noted that the "nose-dive" phenomenon is sensitive to the magnitude of the angular turn made by the pig and, therefore, is worst on non-symmetric wye geometries A considerable number of pigging tests have been conducted to evaluate the operational performance and pigging characteristics of... adaptable for gas tests using air rather than water A 389 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology Fig.4 Pig-testing facility schematic 390 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pigging through Yfittings photograph of the test facility is shown in Fig.5 The test facility included the following items: 1 air