July/August 2005 Inspectioneering Journal
Date July/August 2005
Volume  11
Issue 4
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July/August 2005 Inspectioneering Journal Article Index

  • July/August 2005 Inspectioneering Journal
    By Richard D. Roberts at Quest Integrity Group, and John Brightling at Johnson Matthey Catalyst

    Having the ability to substantially extend tube life in Steam Reformers is essential in maximizing use of capital investments in Methanol, Hydrogen, and Ammonia Plants. With the price of nickel at an all time high, the cost of installing a single reformer tube upwards $20,000 USD.However, in today's highly competitive markets the effect of the unplanned downtime in reducing the plant on-stream factor is far greater than the installed cost of a single reformer tube.

  • July/August 2005 Inspectioneering Journal
    By Jonathan D. Dobis at The Equity Engineering Group, Inc., and David N. French

    This bulletin is part of a series of WRC Bulletins that contain the technical background and other information to evaluate damage mechanisms in various industries to facilitate the use of API 579. These bulletins, shown below, will be updated based on the latest knowledge and technology developed for identification of damage mechanisms.

  • July/August 2005 Inspectioneering Journal
    By Julian Speck at TWI Ltd., and Bryan Kenzie at TWI

    The ultrasonic Time of Flight Diffraction (TOFD) technique was developed for the UK nuclear industry during the 1970s to provide a method for measuring the height of planar flaws. TOFD is now generally recognized as the most accurate ultrasonic technique for measuring the height of embedded planar flaws (eg. Cracks, lack of fusion, etc.) that lies perpendicular to the surface.

  • July/August 2005 Inspectioneering Journal
    By Mark Bagnell at Equipment Management & Inspection

    Aging phenolic resin reactors built in the 1960's were constructed of SA304 stainless steel, many of which were originally fabricated to ASME Section VIII standards were never registered as such nor with the National Board. Some of these reactors have been exhibiting stress corrosion cracking, (SCC) in the shell plate where external carbon steel structural components such as support legs and vacuum rings are attached. The problem is observed primarily at the interface of support legs where reinforcing pads or "poison" pads have not been installed. Of the vessels inspected to date approximately 50% have been identified as having SCC.

  • July/August 2005 Inspectioneering Journal
    By Sanjoy Das at Bhabha Atomic Research Centre, and B.K. Shah at BARC

    Radiography is the most widely used volumetric examination technique for non-destructive evaluation of components, as it offers the advantage of direct viewing of the flaw image, judging the type of flaw and provides a permanent record. Flaw characterization methods, described by size, shape & Location, require classification of the type or nature of flaw, position of flaw and flaw severity. Accurate sizing of the flaw to assess its severity is important. ISO Guide 25 "General Requirements for the Competence of Calibration and Testing Laboratories" (1990), requires one to specify the uncertainty of each measurement. In radiography there are several factors which contributes to uncertainty for quantitive measurement. This paper describes a study undertaken to calculate the uncertainty in flaw sizing and to estimate the real size of discontinuities observed in radiography.

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