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• W2004108997 abstract "ABSTRACT The Oman to India gas pipeline is designed for a maximum water depth of 3500 m. For such a pipeline, resistance to hydrostatic collapse is a critical factor and dictates that ery heavy wall pipe be used, preliminarily 24 ID × 1.625 wall. Because of the water depth, much of the installation will be by J-Lay which requires that the Joint be welded and inspected in a single station. This paper describes the results of welding and ND T test programs conducted to determine the minimum time to perform these operations inheavy wall pipe . INTRODUCTION The Oman Oil Company is implementing the Oman to India gas pipeline project. The offshore section of this pipeline is 1139 Km long, between Ra's al Jifan in Oman and Rapar Gadhwali in India, in water depths up to 3500 Meters, Approximately 80?40 of the pipeline route will be in waterdepths where heavy wall pipe is needed to resist hydrostatic collapse, and the J-Lay technique will most likely be used for installation, Using the J-Lay technique equires that joint alignment, welding, inspection and coating all be performed in a single station. Minimizing the time required to perform these operations will have a significant impact on overall construction costs and schedule. An Industry Review was conducted to identify methodsthat would satisfy the initially projected requirement of 45 min. to complete both welding and NDT. Two welding methods were selected from the review groups to perform the welding test program and four non-destructive methods were selected for the NDT test program. This paper reports the results of these test programs and indicates areas within each operation where further work is desirable. SUMMARY Two companies, one using a modified form of GMAW and the other using automatic GTAW with a hot wire feed, were contracted to perform the welding tests listed below,Develop a welding procedure for the 2-G position on26OD × 41.3mm wall pipe.Demonstrate the procedure on a single weld.Make a series of three consecutive welds, each weld in under 38 minutes. Both welding systems used a narrow gap technique that, when employed by three units equally spaced around the pipe and welding in unison, was able to complete the weld in under the goal of 38 minutes. The narrow groove minimized the amount of filler metal required, so that welding parameters approaching the maximum deposition rate could be developed. This report provides details of each welding procedure including filler wire, shielding gas, travel speed, arc parameters, and joint design. Four companies were selected to perform the NDT portion of the program as follows:Develop a NDT procedure for inspection of 26 OD × 41 .3mm wall API X60 pipe weld in the 2G position.Demonstrate the procedure cycle time, The processes used for this work are; Film radiography, Real Time Radiography, Mechanized ultrasonic testing(Pipeline system), and Mechanized ultrasonic testing (Pressure vessel system)." @default.
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• W2004108997 date "1995-05-01" @default.
• W2004108997 modified "2023-09-27" @default.
• W2004108997 title "Welding And Ndt Development In Support Of Oman - India Gas Pipeline" @default.
• W2004108997 doi "https://doi.org/10.4043/7703-ms" @default.
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