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Recent content by Eddycurrentguy

  1. Eddycurrentguy

    LPG pipeline is damaged

    Clockspring is a great product, but to insure integrity, you would have to apply over the entire to avoid the problem Big Inch mentioned in his post. Cheaper and less labor intensive to just replace the segment. As a bonus, you might be able to sleep better at night knowing that the line...
  2. Eddycurrentguy

    Hardness test results

    I would take additional readings close to, (but not too close, lol) to the high reading, or take another traverse above/below for comparison. Hardness tests can be affected by many factors...its possible you hit a patch of transformation product that is not representative of the remainder.
  3. Eddycurrentguy

    Magnetic Properties of ASTM A108

    A permanent magnet may be more convenient, but probably won't provide enough field saturation to achieve the desired affect.
  4. Eddycurrentguy

    Measuring wall thickess to use in B31.1 wall calcs

    Jaydee, tmin is a calculated value based upon pressure, joint efficiency, radius, stress value; are you trying to determine the maximum pressure a vessel can withstand based upon current vessel thickness?
  5. Eddycurrentguy

    A212 Vessel Brittle Fracture Failures

    Not exactly a vessel failure per se, but the information in the links below is interesting. http://www.scribd.com/doc/58344999/A-212-Pressure-Vessel-Steel-A-Case-Against-Continued-Use http://products.asminternational.org/fach/descendant.do?record=809&database=faco
  6. Eddycurrentguy

    Elbow wall thickness discrepancy

    Taking UT readings at the crotch location can be affected by many factors such as type of transducer (dual vs single element), frequency, size, surface preparation, couplant saturation, operator experience, etc. You may want to re-examine these areas using an experienced technician to see if...
  7. Eddycurrentguy

    SWPS Inquiry

    Best bet is to call AWS bookstore customer service [888-WELDING] and ask for an abstract. They might be able to assist you directly as well.
  8. Eddycurrentguy

    NDT

    Plus it's unusual for a procedure to incorporate both iridium and cobalt...seperate procedures for radiation source are required by all known codes. Not withstanding the exposure time difference, the quality of the radiation will have a marked effect on contrast, latitude, sensitivity, quality...
  9. Eddycurrentguy

    Level of hi-low in circunferential joints

    The 1/8" misalignment is predicated upon the wall thicknesses being equal. Larger variations are permissible as described in API 1104 Section 7.2
  10. Eddycurrentguy

    Residual Magnetism for seamless pipe

    Short answer: Average of four circumferencial readings <30 Gs; no single reading > 35 Gs. ...You should get a complete copy for your use...See section E.7...the above is a brief paraphrase...
  11. Eddycurrentguy

    relevant wall thickness

    Relevant is a subjective term. Do you mean nominal, or thinnest that a section can be to maintain structural integrity? In any case, the fabrication drawing should have this information specified.
  12. Eddycurrentguy

    rt1 vs rt2

    RT 1, 2, 3 and 4 refer to a marking on the name plate that describes the amount of radiography performed on the vessel, which is used as the joint efficiency factor. See ASME VIII, Div. 1, UG-116
  13. Eddycurrentguy

    All codes

    The question is too vague. The short answer is that a welder needs to be qualified to use a specific welding procedure as required by the appropriate code or specification.
  14. Eddycurrentguy

    Pipe manufacturing

    One of the best books you can acquire can be ordered from Amazon: http://www.amazon.com/History-Line-Manufacturing-North-America/dp/0791812332 As the title would imply [History of Line Pipe Manufacturing in North-America] it details the history of line pipe with great detail. In addition to...
  15. Eddycurrentguy

    Welding on a pipe filled with cold water

    Other suggestions include using E8018-C2 electrodes which have good impact properties. These electrodes operate really well, have a low affinity for hydrogen, and the final weld, if properly applied via a qualified welding procedure, will yield positive results. The butering technique...
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