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© 2018 PETROLIAM NASIONAL BERHAD (PETRONAS)
All rights reserved. No part of this document may be reproduced, stored in a retrieval system or transmitted in any form or by any means (electronic, mechanical, photocopying, recording or otherwise) without the permission of the copyright owner.
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Surveillance
Ground Patrol Air Patrol
……
Pig Receiver
Pig Launcher
Above Ground WallThickness Check
Crossing
Inter Pipe CrossingBlock Valve
10 Y (max)
Metering Station
Above Ground Piping Inspection
Cleaning Pig
• Clean inside pipe wall• Prepare pipe ready to
inspect
CP Station
• Check DC Voltage Source supply to protect pipe.
• Adjust to good protection
Compressor Station
• Above Ground Piping Inspection•Gas Turbine Monitoring
Close Internal Pipe Survey
(CIPS)
Direct Coating Voltage
Gradient (DCVG)
Detect Coating Defect Check protection
voltage every 1 meter
• Check pipe wall loss• Detect Corrosion
Valve & Actuator Maintenance
Pipe-to-Soil CP Survey
Annual CP Survey at every test post
Real Time Leak Detection
Pipeline Leak Detection
System (PLDS)
MFL PIG
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