Close Proximity Radiography www.tracoilandgas.com
Overview What is Close Proximity Radiography? • Stand-off Technique • Procedures • Applications • Equipment • People • Advantages • Limitations • Summary • • What Next?
What is Close Proximity Radiography? Close Proximity Radiography allows radiographic inspection • surveys to be carried out adjacent to ongoing work scopes. This prevents the historical onsite disruption and the wide barrier • zones associated with scattered radiation.
What is Close Proximity Radiography? The equipment is fitted with a Collimated Head Unit which directs • the primary beam of radiation to a given point of inspection. This restricts any secondary radiation affecting the work site • Container Head Unit Primary Beam
What is Close Proximity Radiography? Additional shielding can be added to further reduce exposure to • the site if required Site example of the equipment being used for weld inspection Container Collimator Head Unit Pipe/inspection item Primary Beam Imaging Film
Stand-off Technique When the container and pipe are not in direct contact with each • other, this is known as the “stand - off” technique This technique is predominantly used on ≤ 3 ½ “ pipework. • There is more scattered radiation but the container can still be • used to limit and direct the beam of radiation Stand-off Stand-off Site example
Procedures The correct use of procedures and cooperation with associated governing bodies are paramount to safety and project success. TRAC Local Rules & Procedures • HSE Notification • Nuvia (RPA) • SEPA •
Applications Utilising either Digital or Darkroom imaging, close proximity radiography techniques and equipment offer the ideal solution for minimal site area restrictions and are predominately used on ≥ 4” pipework Weld Corrosion Flexible Inspection Monitoring Riser Inspection
Equipment TRAC use the Gilligan Engineering “ VIKING” Close Proximity System Small and compact container • Uses Selenium 75 or Iridium 192 radioactive sources • Can also be adapted to use the guide tube for additional • techniques and applications
Personnel All lead radiographers are qualified to PCN or ASNT standards and • are subject to TRAC competency and trade tests All assistant radiographers receive inductions and awareness • training followed up with on-site training All radiography personnel are required to attend an annual • medical, and their exposure to any radiation is monitored and logged
Advantages The main advantage over other techniques is the safe working • distance and fewer restrictions to neighbouring activities This can be achieved by combining the correct source for the • work scope and additional shielding or controls • As above, using this technique could have a maximum working area of only 3 meters • As below, using other equipment and techniques usually requires a minimum of 10 meters
Limitations The container and head assembly are made from solid • tungsten. Whilst this offers excellent shielding properties, tungsten is heavy and this must be considered when setting up the unit prior to work starting On some applications (tight spaces/access), the Flexible • Guide Tube and Small Collimator has to be used (pictured on the right)
Summary Close Proximity Radiography reduces the controlled area of work, creating a safer environment for the technicians and other personnel on board, with a range of different applications, this technique offers the client more options when planning work scopes. TRAC are proud offer this solution in addition to our Techops radiography equipment. This equipment complements our ongoing commitment to the industry and embraces the latest technologies and best working practices. Other equipment solutions are on the market and can be supplied by TRAC for bespoke applications and requests.
What Next? • Any Questions? • Any Upcoming Work Scopes? • Any Other Issues/Challenges?
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