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.

Up to 1600 thickness measurements per second around the circumference of the pipewall and a detection capability of +/- 0.1mm in depth, allows the pipeline condition to be accurately illustrated in our software (C-scan).

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 stores continuous measurement of the pipe wall, which is illustrated as A, B and C-scan presentation using our software. The inspection speed of the single probe UT pig is somewhat limited and the method is best suited for pipes below 5000m. Our pigs can perform ultrasonic measurement of pipelines with dimensions from 3 “-64” diameter.

Multi-Channel pig (Multiple Probes): The pig has attached ultrasound probes all around the circumference and can therefore operate at higher inspection speeds. Optimum speed is 1m/s. This pig can therefore inspect longer pipe stretches on one battery charge. Dimensions from 3 “to 64” . 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.