Operation & Monitoring ofTrans-Alaska Pipeline

Wes TonkinsEngineering Advisor

Alyeska Pipeline Service Company

Operation

n Operating Gradientsn Minimum Required Pressure Criteria

(MOP)

Monitoring

n Settlementn Corrosionn Data Analysis

Monitoring

n Settlement• Curvature Pig

Monitoring

n Settlement• Curvature Pig• Deformation Pig

Monitoring

n Settlement• Curvature Pig• Deformation Pig

• Monitoring Rods

• Thermistors

Monitoring

n Corrosion• Ultrasonic Pig

– Prioritize Digs & Visual Inspection

Monitoring

n Corrosion• Ultrasonic Pig

– Prioritize Digs & Visual Inspection

• Cathodic Protection (CP) Readings• Corrosion Coupons

Monitoring

n Data Evaluation• Pressure De-rates (Rstreng)

– Rstreng Analysis of Visual Inspection

• Sleeve to Maintain MOP• Buckling Analysis

– Curvature / Corrosion - SAFE Program

Summary

n State of the Art monitoring toolscombined with data evaluation byexperienced personnel ensure that theMOP requirements are maintained forall operating scenarios of the Trans-Alaska Pipeline