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A random ultrasonic thickness gaging method is used for the assessment of pipeline technical state (p. 7.5.3.9. of GD 39-132-94 "Oil Field Pipeline Maintenance, Audit, Overhaul and Screening Regulations"). Statistical processing of results is conducted in accordance with the "Prediction of maximum corrosion penetration and a time period before transparent defects show up, based on ultrasonic thickness gaging" Methodological Instructions. |
According to the documents listed above the diagnostics of the pipeline technical state consists of the following stages: |
Delimitation of pipe parts with homogenous operating conditions
Determination of control points for thickness gaging
Pipe wall thickness gaging at control points based on a special technique
Statistical processing of the results. Determination of corrosion damage distribution regularity and parameters.
Prediction of a maximum corrosion penetration at control points based on corrosion damage distribution regularity.
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Additional works are conducted on field corrosion control units with the use of samples and electrochemical sensors: |
Assessment of types and average rate of corrosion according to field corrosion control units
Assessment of pit corrosion rate
Determination of predictive pit corrosion rates according to a special method based on sample profilometry using a metallographic microscope
Assessment of maximal rates of corrosion. Determination of a maximum life period of objects.
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To issue a conclusion as to the pipeline technical state, the following measures should be taken: |
Detection of corrosion-hazardous pipe parts based on corrosion-hydraulic calculation using the "Extra" software bundle.
Ultrasonic thickness gaging
Installation and withdrawal of corrosion control units
Statistical processing of the results. Issue of conclusions with detailed substantiation.
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We deliver and install corrosion control units. On completion of works the Customer retains ownership of the units and may use them for further corrosion monitoring activities. |
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Technical diagnostics of pipelines can also include:
- monitoring of metal mechanical characteristics
- monitoring of pipeline hydrogenation with the use of removable electrochemical probes
Such diagnostics is aimed at the prevention of damages caused by metal hydrogenation.
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We have a license for technical diagnosing and monitoring of equipment and materials using nondestructive methods. License #10O-02/6347 of 25.07.97 issued by the Russian Federal Committee for Mining and Industrial Supervision |
