Close Proximity Radiography - TRAC Oil & Gas
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Transcript of Close Proximity Radiography - TRAC Oil & Gas
• What is Close Proximity Radiography?
• Stand-off Technique
• Procedures
• Applications
• Equipment
• People
• Advantages
• Limitations
• Summary
• What Next?
Overview
• 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
What is Close Proximity
Radiography?
Container Head Unit Primary Beam
• Additional shielding can be added to further reduce exposure to
the site if required
Site example of the equipment being used for weld inspection
What is Close Proximity
Radiography?
Container Collimator Head Unit
Pipe/inspection item Primary Beam Imaging Film
• 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 Technique
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
Weld
Inspection
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
Corrosion
Monitoring
Flexible
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
• 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
Personnel
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)
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.
Summary