Goller C.,TD Williamson
PPIM 2012 - 24th Pipeline Pigging and Integrity Management Conference | Year: 2012
Multiple data set in-line inspection (ILI) results from several pipe joints containing damage locations created using excavation equipment of the type often associated with right of way encroachment events in addition to field results from ILI surveys using multiple data set tools are presented. The multiple data set magnetic flux leakage (MFL) based tool configuration used for acquiring the data presented included the use of several commonly used methods combined into a single ILI tool. Several MFL sections are used, i.e., an oblique or helical magnetizer and sensor assembly for detection and quantification of axially oriented features, a high level axially oriented magnetizer section for volumetric metal loss, a low field magnetizer section to enable detection of magnetic property variations, followed by high accuracy deformation sensors incorporating proximity measurement in the pipe wall contact portion for internal/external discrimination and surface condition determination. This is an abstract of a paper presented at the Pipeline Pigging & Integrity Management Conference (Houston, TX 2/8-9/2012).
Morgan J.,TD Williamson
Materials Performance | Year: 2013
A discussion covers a binary corrosion inhibitor that is applied to natural gas pipelines using a pig train that includes a specially designed spray pig; occurrence of internal pipe corrosion in wet gas transportation; protecting steel natural gas pipelines from top-of-the- line corrosion; evaluation of the inhibitor application with flush-mounted coupons installed along the top, sides, and bottom of the internal pipe wall; distributing the corrosion inhibitor on the top and sides of the pipe wall; and the protective film formed by the binary inhibitor chemicals.
Jandu C.,Andrew Francis and Associates |
Taylor M.,Andrew Francis and Associates |
Narikotte S.,TD Williamson
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2011
In-line Inspection (ILI) surveys are periodically performed to determine the condition of the pipeline. Typical ILI surveys involve Magnetic Flux Leakage primarily to determine metal loss and simple single channel Calliper surveys to determine any signs of geometry imperfections. Additional surveys such as highresolution multi-channel Calliper deformation tools are occasionally used to accurately record imperfections to enable a more accurate assessment of the integrity of the pipeline containing the imperfection. Such tools have had limited employment, and therefore little experience exists of using the data obtainable for the detailed assessment of defects. This paper presents a study of such a case. As part of an In-line Inspection (ILI) of an offshore pipeline, a high-resolution deformation survey recorded numerous dent anomalies which had potentially resulted from a single dragged anchor incident before the pipeline was trenched. This data set was correlated to Magnetic Flux Leakage inspection data to confirm external mechanical damage. Pipeline sections having anomalies that were either found close to girth welds, or had associated corrosion defects were automatically selected for repair. The remaining anomalies were assessed in order to determine their acceptability for the maximum allowable operating pressure using the approaches detailed in API-579. Due to the sharp nature of some of the dents, elastic-plastic finite element analyses (FEA) were performed using denting profiles generated from the calliper data of the ILI run. API-579 level 3 assessments were then carried out using the FEA results. This paper details the high-resolution deformation tool findings and the approach used in order to assess the fitness-for-purpose of the pipe with the recorded anomalies. Copyright © 2011 by ASME.
Wint D.,TD Williamson |
Payne L.D.,TD Williamson
PPIM 2013 - Proceedings of the 25th Pipeline Pigging and Integrity Management Conference | Year: 2013
As the liquids-rich unconventional resource plays are developed, there are multiple challenges and implications for midstream system infrastructure that fit particularly around pigging and integrity. Specifically, the high liquids content of the production causes significant issues with slugging, high differential pressures (liquids loading), and corrosion. Crude oil containing high levels of paraffin and other flow reducing contaminants, i.e., frac sand, chlorides, spent chemicals, presents flow issues in these midstream pipeline systems. Some of these lines have to be pigged daily to maintain production at the well head. A discussion covers the situations that were observed and experienced in pipelines operating in various shale plays located throughout US covers the pipeline operating conditions; pipeline design; contaminants that contribute to internal corrosion attacks on gathering systems transporting natural gas, NGL, and crude oil produced in the US shale plays; and pigging. This is an abstract of a paper presented at the Proceedings of the 25th Pipeline Pigging & Integrity Management Conference (Houston, TX 2/13-14/2013).
Dum F.,TD Williamson |
Garaev N.,TD Williamson
Proceedings of the American Gas Association, Operating Section | Year: 2015
Often driven by a demanding market and relentless shareholder expectations, operators work smart and hard to achieve 100 percent success in the field. This is particularly applicable to pipeline isolation and operational safety. This paper will demonstrate how the trend toward field-proven Double Block and Bleed (DB&B) isolation is maximizing project efficiencies and providing pipeline operators with significantly reduced costs and greatly increased safety. As isolations are a routine aspect of pressurized pipeline maintenance, the DB&B methodology was developed to help operators, across geographies and industries, approach 100 percent success in achieving line isolations with no detectable seepage and without shutting down their production. The DB&B approach can be applied to: 1. Replacement of leaking block valves 2. Cut out and repair of third-party damage 3. Cut out and replacement of imperfections identified during inline inspection This paper will be a review of theory, laboratory testing and field applications as they relate to DB&B efficiency.