TAILIEUCHUNG - PIPELINE PIGGING TECHNOLOGY- P8

PIPELINE PIGGING TECHNOLOGY- P8: 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 . Pipeline schematic with modifications. 192 Please purchase PDF Split-Merge on to remove this waterr Ethylene pipeline cleaning interface length of contaminated ethylene. To expedite the process decommissioning was done in three stages with three nitrogen injection points see . Nitrogen injection would begin at the south end of the pipeline as the interface passed the next injection site the previous section was shut in depressured and prepared for capital work. Due to the amount of nitrogen involved in decommissioning it was necessary to use three nitrogen service companies each with one injection point. Capital works In order to clean and inspect the entire 180-km line in a 28-day period the pipeline had to be separated into four sections. The section lengths were set at 75km 51km 35km and 19km based primarily on the amount of polymer expected in each section. The deposition problem was considered to be more severe at the north end of the line which is furthest from the plants than at the south end so the section lengths decreased proportionally. Each section had its own launch and receive traps as well as facilities to separate the polymer from the nitrogen. Four simultaneous pigging operations proceeded on a 24-hour-a-day basis. For capital works Novacorp was retained to design procure fabricate and install all additional pig trap sites complete with polymer-separation systems. The receive sites had separation facilities to remove any debris from the nitrogen stream as it was vented to the atmosphere. These consisted of a separator knock-out drum pressure let-down valve and final filtration bags see . Cleaning and inspection Cleaning commenced immediately upon completion of the capital works for a section. All cleaning and inspection tools were propelled by nitrogen with their speed governed by a control valve at the receive sites. The proposed schedule of cleaning and inspection runs is shown in .

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