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Title: Vector magnetometry sensor for internal inspection of gas distribution mains. Final report, February 1995-August 1996

Abstract

There is a recognized need for an advanced distribution pipe inspection system which can operate in 4` and 6` diameter pipes. This program developed a prototype sensor car based on vector magnetometry. The prototype sensor system was tested in the laboratory. Test data is presented showing defect detection capability for defects as small as 25% of the pipe wall. Field tests were also conducted with mixed results. Varying corrosion levels were observed. However, specific defects were difficult to identify.

Authors:
;
Publication Date:
Research Org.:
Little (Arthur D.), Inc., Cambridge, MA (United States)
OSTI Identifier:
538819
Report Number(s):
PB-97-203285/XAB; ADL-44737-00
CNN: Contract GRI-5093-270-2629; TRN: 72886651
Resource Type:
Technical Report
Resource Relation:
Other Information: DN: Original stock has color illustrations. Reproductions are in black and white; PBD: Jun 1997
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; NATURAL GAS DISTRIBUTION SYSTEMS; INSPECTION; MAGNETOMETERS; FIELD TESTS; PROGRESS REPORT

Citation Formats

Farra, R., and Fowler, T.. Vector magnetometry sensor for internal inspection of gas distribution mains. Final report, February 1995-August 1996. United States: N. p., 1997. Web.
Farra, R., & Fowler, T.. Vector magnetometry sensor for internal inspection of gas distribution mains. Final report, February 1995-August 1996. United States.
Farra, R., and Fowler, T.. 1997. "Vector magnetometry sensor for internal inspection of gas distribution mains. Final report, February 1995-August 1996". United States. doi:.
@article{osti_538819,
title = {Vector magnetometry sensor for internal inspection of gas distribution mains. Final report, February 1995-August 1996},
author = {Farra, R. and Fowler, T.},
abstractNote = {There is a recognized need for an advanced distribution pipe inspection system which can operate in 4` and 6` diameter pipes. This program developed a prototype sensor car based on vector magnetometry. The prototype sensor system was tested in the laboratory. Test data is presented showing defect detection capability for defects as small as 25% of the pipe wall. Field tests were also conducted with mixed results. Varying corrosion levels were observed. However, specific defects were difficult to identify.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1997,
month = 6
}

Technical Report:
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  • The Gas Research Institute (GRI) has been sponsoring the development of a vehicle and sensors for an integrated nondestructive internal inspection system for natural gas distribution pipes. Arthur D. Little has developed two sensor technologies, Vector Magnetometry (VM) and Lightwave Defect Imaging (LDI) for the system. The Vector Magnetometry sensor utilizes multiple arrays of miniature detection coils (fluxgate magnetometer elements); a three-axis array measures both the amplitude and phase of the magnetic leakage field that occurs in the vicinity of pipe wall defects. This technology is applicable to both cast iron and steel pipe.
  • Foster-Miller, Inc. conducted a study of the environment in natural gas distribution pipe. This analysis of pipe environment included analysis of how the environment affects the performance of snake-type (pushed), dragged tether (pulled) and combined (pushed and pulled) inspection devices. The frictional characteristics of various snake and tether materials on cast iron, plastic and steel were experimentally determined as part of this analysis. A model of snake behavior was developed and experimentally verified. Foster-Miller, Inc. also documented the status of the Pipe Mouse Semi-Autonomous Inspection System under this contract. This report documents the design rationale and the status of thismore » design.« less
  • The report evaluates promising trenchless technologies for their potential use in rehabilitating or renewing gas distribution pipes. Of the commercially available trenchless renewal options, the U.S. gas industry is primarily using the sliplining method of inserting a new pipe within the old pipe and to some extent pipe bursting. Other trenchless methods have seen little use in the U.S. even though many of these technologies have proven successful and cost-effective for gas utilities have proven successful and cost-effective for gas utilities in Europe and Japan.
  • An evaluation of the Westinghouse-developed ion mobility sensor (IMS) for NOx monitoring in a simulated smokestack gas mixtures (made up of carbon dioxide, water vapor and oxygen in a nitrogen ambient) has been undertaken, IMS positive ion spectra for NO and NO2 in nitrogen and in the simulated stack gas mixture have been shown for the first time at room temperature. The sensitivity of the IMS to NO and NO2 is excellent (in the fractional ppm range) and extend over the range of interest to GRI.
  • The report investigates the feasibility of adapting commercial magnetic flux leakage (MFL) transmission pipeline inspection systems to small diameter gas distribution mains. The investigation encompassed technical challenges required for implementing MFL within the gas main environment. These included component miniaturization, ability to attain meaningful pipe wall thickness measurements and identification of external and internal defects with an air gap between the magnet poles and the pipe wall, conveyance systems for moving the inspection device, tapping of the gas main and restoration of the main to its original mechanical competence. Conclusions of the research and recommendations for future work are provided.