operation & monitoring of trans-alaska pipeline · alyeska pipeline service company. operation...
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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