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  1. James01

    Tolerance & POD with ECI

    I have just had an Eddy Current Inspection Carried out on some structural welds in a crane pedestal. There was 10.0mm crack reported in 2002 (before my time with the company) this was never verified with MPI and the NDT tech did not mark the location. During the subsequent years no one was...
  2. James01

    Heat Exchanger tube WT design

    The company I work for has had a refridgeration skid designed & buit by a vendor. The condenser design seems a bit unusual to me. The tubes are designed to 15barg pressure and the shell side is designed to 30barg. The wall thickness of the tubes appears to be within the stress limits. But...
  3. James01

    Threaded Branch connection

    Luis Your review is correct, the damage was not caused by CUI just atmospheric corrosion, the line is in the roof area of a process module. in order to carry out repair welding I am just as quick to replace the spool piece as the system would still require shuting down purging building...
  4. James01

    Threaded Branch connection

    I have a 12" dia 10.0mm WT gas line operating at 10barg, there is a Thread-o-let branch connection to a bleed valve, the branch is 1" SCH 80 and has been found to have severe external corrosion damage, Radiography has calculated the remaining WT to be approximately 1.5 to 2.0mm from the thread...
  5. James01

    Nozzle Repair

    I have a pressure vessel that has corrosion damage on the sealing face. The flange face damage is not severe enough to warrant a replavement flange, we are planning on welding ou the corrosion damage and machining the face, The fabrication company have provided a weld procedure for V butt...
  6. James01

    Flange face repairs

    I have a pressure vessel that has corrosion damage on the sealing face. The flange face damage is not severe enough to warrant a replavement flange, we are planning on welding ou the corrosion damage and machining the face, The fabrication company have provided a weld procedure for V butt...
  7. James01

    Vessel Freezing

    The vessel contained gas condensate at the time, not normal conditions and was at 5barg and ambient temp. This vessel should not have contained the condensate, this was introduced by error!! the process system tripped and the system blew down and in a sudden depressurisation the vessel...
  8. James01

    Vessel Freezing

    I have a 30 year old pressure vessel constructed from BS-150-151-28A plate. The vessel is in good condition and is still at nominal wall thickness of 19.0mm. During an operational upset the vessel was subjected to a temperature of -14 degrees C, it was only at this temperature for 10 minutes...
  9. James01

    linear accelerators

    I am surprised to hear that TOFD is proving very slow and you are considering a Linear accelerator to speed things up. TOFD is ususally much faster than Radiography. The use of this type of X-Ray unit would normally require the vessel to be sited in an exposure bay designed for use with the...
  10. James01

    Ultrasonic Inspection of Inconel 625 Clad Vessel

    JR97 The tech had reported a local area of thinning ie 3.0mm less than the rest of the vessel, that is what lead us to believe that there was either an area of disbondment or we had lost the linning in that location. The vessel was full of water during the original inspection and also the...
  11. James01

    Vessel Age

    Are you running a Risk Based Inspection strategy? Your frequency of inspection will be dependant more on the number and extent of any repairs, the service conditions, degradation mechanisms, liklihood and consequence of failure etc rather than just the age of the vessel.
  12. James01

    CUI-Corrosion Under Insulation

    I have been through extensive CUI campaigns on our offshore platforms over the past 10 years and the reliability of NDT techniques to detect CUI is questionable. The radiographic techniques are very good, but time consuming, expensive and have their own inherent safety issues. Long range...
  13. James01

    Repair welding of vessel overlay

    Steve The base metal is Superelso 500 and the CE is between 0.4 & 0.45 and the 3mm clad 904l. The cladding was subjected to the PWHT. The degradation of the cladding by the PWHT process is minor in terms of the corrosion resistance requirements. I am the certifying authority and as such am...
  14. James01

    Repair welding of vessel overlay

    The vessel is NACE MR0175 compliant, there are no other specific hardness requirements. The vessel design code is British standard BS 5500 Cat 1. One of our Metallurgists is happy with the weld procedure described above due to the small area to affected and that the area will be filled with...
  15. James01

    Repair welding of vessel overlay

    I have a carbon steel 75.0mm thick pressure vessel with a 3.0mm 904L overlay. Internal inspection has revealed a pit defect in the overlay with a diameter of 5.0mm and a maximum depth (taking account of measurement uncertainties) of 2.5mm. The vessel was heat treated during construction. I...
  16. James01

    Corrosion under insulation (offshore)

    We have been running a CUI campaign across our installations for the last 8 years. We are currently in a position of 100% removal of lagging and visual inspection of the pipe surface. We have arrived at this after trialling various NDT techniques and targeted removal campaigns. Our current...
  17. James01

    Long Range UT v Intelligent Pigging

    All Thanks for the additional info, the intelligent pig located the leak before we had a chance to deploy the long range UT. Thanks jim
  18. James01

    Long Range UT v Intelligent Pigging

    We have a leak on a Riser line that is held inside a J-Tube on one of our installations (pipe in pipe). The internal pipe is the one that has leaked. The question is would long range Ultrasonics be capable of picking up a pin hole leak, ie 3mm diameter hole being the worst case. The defect...
  19. James01

    pre-NDT paint removal

    HP water jetting may be OK. It would be better to use a solvent remover and thoroughly clean the part after removal of the paint.
  20. James01

    Heat Exchanger Tube Defect Assessment

    Their are SRB's in the oil system and we instigated a regular monitoring and biociding programme a couple of years ago.

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