Pipe laying using a reel ship is an attractive option, as all pipe joints, with the exception of the offshore tie-ins, are welded onshore. This technique is considered to be one of the most reliable methods for laying a pipeline offshore. This article describes the onshore production facilities, welding processes, and the properties achieved during welding procedure trials that include strain-aged Charpy impacts. The onshore fabrication of pipelines for reeling involves having a purpose-built workshop, laid out in such a way to ensure that the welding of pipe material and butt joints is carried out with the minimum of disruption. Also, contained within these facilities will be a radiographic and coating unit. Fabricated pipeline sections up to 1000 m (3280 ft) in length, referred to as pipe stalks, are transferred from the fabrication shop to an open holding area. Construction of the 16-in. (406.4-mm) -diameter pipeline involved the following welding procedures: Pipe-to-Pipe Mainline Onshore. The method used for the mainline butt joint welds consisted of an automatic pulsed gas metal arc welding (GMAW-P); Complete Penetration Repair to Main line Weld Onshore. Repairs to the mainline welds are carried out in the pipe stalks' holding area, and welding is carried out in an all-weather habitat; Pipe-to-Pipe Mainline Cut Out/Tie-In Onshore. The weld procedure is used for welding butt joints between pipes, which can consist of mainline butt joint weld cut-outs and butt joint welding of pipe stalks to pipe stalks, or pipe stalks to reeled pipe; Pipe-to-Pipe Tie-In Offshore. The weld procedure used for offshore tie-ins is similar to that used for pipe-to-pipe tie-ins onshore, with the exception that the welding procedure is qualified in the 6G position. Tensile results varied from 589 N/mm2 to 628 N/mm2, depending on the weld procedure. Hardness results varied from 174 HV to 222 HV. It has been reported that strain-aged trials carried out on pipeline steels modified with the elements niobium, vanadium, molybdenum, or titanium showed no significant degradation of properties.


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    Title :

    Weld metal properties of reeled pipelines


    Contributors:
    Still, J.R. (author)

    Published in:

    Publication date :

    2004


    Size :

    6 Seiten, 5 Bilder, 10 Tabellen, 5 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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