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Houston, TX, United States

Conder R.J.,Aberdeen Group | Felton P.,Aberdeen Group | Smith R.,Global Solutions U.S. Inc. | Burke R.,Pipestream Inc. | And 2 more authors.
Proceedings of the Biennial International Pipeline Conference, IPC | Year: 2010

The composite pipe system, known as XPipe™, uses high-performance adhesives to manufacture a metallic composite pipe. Both technical development and a robust manufacturing quality system are required to ensure the safe use of such novel technology. Several aspects are discussed in this paper. Firstly, the use of ultrahigh strength martensitic steels in a buried, cathodically protected environment requires an understanding of their susceptibility to hydrogen embrittlement. A series of slow strain rate and constant load tests was performed under polarised conditions to establish any reduction in ductility over samples tested in air. The results are presented and implications for their use in such a system are discussed. Secondly, although the technology to perform quality welds in thin walled austenitic materials using automated orbital techniques is well established, weld inspection by radiographic techniques is not preferred due to the continuous nature of the process and safety considerations. However, the inspection of such welds by ultrasonic techniques is challenging due to the coarse grained nature of the austenitic welds and the thinness of the liner, well below the 6mm normally considered the minimum for conventional weld inspection. Therefore, Automated Ultrasonic Testing (AUT) requires optimized ultrasonic techniques. AUT capabilities and recommendations towards an optimal inspection concept will be discussed in this paper. Thirdly, the manufacture of the liner, ultra-high strength steel strip and adhesive into the XPipe™ composite pipe requires a robust manufacturing control system, which maintains traceability of the incoming materials and controls and records all the essential parameters during pipe production. This is achieved using a sophisticated SCADA system, using feedback from a variety of sensors. Copyright © 2010 by ASME. Source

Miles D.J.,Pipestream Inc.
Proceedings of the Biennial International Pipeline Conference, IPC | Year: 2012

A solution, known as XHab", has been developed for external repair and reinforcement of pipelines using ultra high strength steel strip. This method involves wrapping multiple layers of strip in a helical form continuously over an extended length of pipeline using a dedicated forming and wrapping machine. The reinforcement provided by the strip can be used to: a) Restore the original maximum allowable operating pressure to a section of defective pipe (e.g. external corrosion or denting), or; b) Reinforce an intact but de-rated section of pipeline (e.g. a Location Class change through encroachment) to maintain reduced hoop stress in the base pipe as required by codes and regulations, but allow reinstatement of the original operating pressure by carrying the additional load in the strips. This paper describes the full-scale qualification testing, including in-field proving runs, and design analysis necessary to demonstrate the field-readiness of the application system and reinforcement product. This includes wrapping and pressure testing of pipe with machined external wall defects. The potential for XHab repair of stress corrosion cracking (SCC) is also discussed for an upcoming series of tests on pipe samples with electrical discharge machined notches. To demonstrate reinforcement of intact pipe, a 40ft joint of 26-inch vintage flash-butt seam welded pipe, instrumented with hoop and axial strain gages, has been wrapped by the XHab machine with sufficient reinforcement to simulate a change from Location Class 1, Div. 2 to Location Class 3 (ASME B31.8). This pipe has been subjected to pressure cycling and ultimate burst alongside an identical unwrapped pipe sample which provides a baseline. The test results are presented and compared to finite element analysis. Copyright © 2012 by ASME. Source

BMC Software and Pipestream Inc. | Date: 2000-09-12


Bond T.J.M.,Pipestream Inc. | Miles D.J.,Aberdeen Group | Burke R.N.,Pipestream Inc. | Venero N.J.,Pipestream Inc.
Global Pipeline Monthly | Year: 2010

EXTERNAL CORROSION of steel pipelines leads to reduced pipe wall thickness and associated pipeline strength. In severely-corroded cases, operators are required to reduce the operating pressure, and hence the product flow rate, to remain with safe working limits of the defective pipe. A method for rehabilitating externally-corroded pipelines has been developed that allows pipelines, which are operating at reduced pressures and flow rates, to be reinstated to their original operating conditions. This method involves wrapping multiple layers of ultra-high strength steel (UHSS) in helical form, over a pipeline - where the loss of wall thickness can be up to 80% of the nominal. Using bellhole excavations, extended sections of externally-corroded onshore pipelines are exposed for cleaning and blasting before overwrapping with UHSS strip, bringing the defective pipeline back to full operating conditions, whilst it remains in service. In this paper, a novel method of pipeline rehabilitation is described, together with the results of evaluation tests of this technology. The authors conclude that the use of UHSS strip is a viable method of rehabilitating externally-corroded steel pipelines. Source

McKinnon C.,J P Kenny Pty Ltd. | Miles D.J.,Pipestream Inc. | Burke R.N.,Pipestream Inc.
Proceedings of the Biennial International Pipeline Conference, IPC | Year: 2010

The composite pipe system, known as XPipe™, is a steel strip laminate technology which uses high-performance adhesives to manufacture a metallic composite pipe. It offers a new method of low cost pipeline construction suitable for onshore gas and oil pipelines in a variety of configurations. The pipe is based on a thin wall liner that provides the fluid containment, the material of which will vary according to service requirements. Fusion bonded epoxy (FBE) coated martensitic ultra-high strength steel strips are then pre-formed and helically wound around the liner to form a laminated high strength reinforcing layer providing the pipe's hoop strength. These are bonded using an adhesive. Unlike conventional linepipe that is manufactured in a pipe mill away from the construction site, this lightweight composite pipe can be produced at the construction facility using a portable manufacturing line. All components of the manufacturing process fit within standard ISO containers each weighing between 5 and 15 tonnes. This allows for easy transportation via truck, and handling or shipping. Existing regulations and codes make no specific reference to metal composite pipes. They are mainly written for steel pipe lines with some mention of plastic pipe. The paper presents a comprehensive review of the following US onshore design codes (ASME B31.4/B31.8) and relevant regulations (CFR (DOT) 49 P192 /P195) in order to establish the applicability of these codes for use on XPipe. The paper describes how XPipe meets the code and regulation requirements with regard to safety, design, material, construction, inspection, testing, operation and maintenance. The paper will identify any areas where XPipe does not meet code and regulation requirements and describe the testing and /or design changes that have been made in order to meet the code requirements. The paper will focus on the how the XPipe can meet the practical requirements of these codes. The paper will describe how the qualification testing is being performed in accordance with DNV-RP-A203 Qualification Procedures for New Technology. The qualification testing focuses on how the XPipe meets or exceeds pipeline safety margins with regard to typical failure modes such as yield, burst, facture, fatigue, collapse, etc. This is a continuous process and is being updated after each step using the available knowledge on the status of the qualification Copyright © 2010 by ASME. Source

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