Method
Pigging of pipelines
Detecting external and internal defects on pipelines
Dacon Services AS offers a wide variety of pigging-inspections which can detect defects such as:
– Cracks
– Deformations
– Corrosion
– Insufficient wall thickness
Results can be presented in A-scan, B-scan and C-scan.
About our intelligent pigs
Dacon Services offers cleaning and videopigging in addition to intelligent pigs equipped with ultrasonic or MFL technology, in order to measure the wall thickness of pipelines.
Our pigs may be used to inspect pipelines with the following characteristics:
• Length: 0 – 60km
• Dimensions: 3″-64″ diameter
• Minimum bend: 1.5D
• Material type: Carbon Steel, austenitic steel, HDPE, HDPE Lined.
• Special: Pipelines with coatings, risers, subsea pipelines.
Ultrasonic Pigging (single probe): The pig is sent by fluid pressure and the ultrasound is sent out through the pipe wall by the use of a rotating mirror. The pig continuously stores measurements of the pipe wall, up to 1600 thickness measurements per second around the circumference of the pipewall, which is illustrated as A, B and C-scan presentation using our software.
Though the inspection speed of the single probe UT pig is somewhat limited, it still has a detection capability of +/- 0.1mm in depth. This means the method is best suited for pipelines up to 5000m.
Multi-Channel pig (Multiple Probes): The pig has multiple ultrasonic probes around the circumference of the pig body, and can therefore operate at higher speeds. Optimum speed is 1m/s. This pig can therefore inspect longer pipe stretches on one battery charge. We use the data to produce both A, B and C-scan presentations.
MFL pig: This pig is based on magnetism (magnetic flux leakage). This type of pigs will have a much greater range and is better suited for inspection of long pipe stretches. Dimensions are customized according to customer requirements.