Leak Detection. Ron Threlfall Manager, Leak Detection, Maintenance and Integration

Transcription

1 Leak Detection Ron Threlfall Manager, Leak Detection, Maintenance and Integration 1

2 Introduction Enbridge Liquids Pipeline Energy Transportation Map Operates world s longest liquids pipeline and Canada s largest transporter of crude oil Operates 25,000 km of crude pipeline Delivers an average of more than 350,000 m 3 /day of crude oil and liquids 2 2 2

3 Leak Detection Methods Comprehensive Strategy Surveillance & Third Party Operator Monitoring Computational Pipeline Monitoring In-line Inspection External sensors 3 3

4 Surveillance & Third Party Aerial & Foot Patrol Third Party Reporting 4

5 Operator Monitoring Supervisory Control & Data Acquisition (SCADA) Site and Host Redundancy High speed network updating pipeline controller Remote control of pumps and isolation valves along pipeline Abnormal Condition Alarms Pressure and Flow Monitoring Safety Systems Line Pressure Protection High Pressure Protection Line Blockage Communication Failure Station Safety Systems Leak Detection Systems 5 Rupture Detection Shut-in Pressure Monitoring Computational Pipeline Monitor (CPM)

6 Computational Pipeline Monitoring / Leak Detection System Material Balance Mathematical calculation used to determine whether a leak has developed in a pipeline Canadian Standards Association Z662 Oil & Pipeline Systems Standard Annex E Recommended Practice for Hydrocarbon Pipeline System Leak Detection Computational Pipeline Monitoring (CPM) Software-based monitoring tool that alerts the pipeline operator of a possible commodity release. 6 API Recommended Practice 1130 Computational Pipeline Monitoring for Liquids

7 Computational Pipeline Monitoring / Leak Detection System Imbalance = Flow In Flow Out + Change in inventory Imbalance > Threshold = Alarm Volume Balance: Flow In Flow Out Compensated Volume Balance: Flow In Flow Out + Change in inventory, based on pressure and temperature Real Time Transient Model Discrepancy between a complete hydraulic model and current measurements. 7

8 Computational Pipeline Monitoring / Leak Detection System 4 Dimensions of Leak Detection Performance Reliability - False Alarm Rate Sensitivity - Time to detect a leak of a given size Robustness - Distribution of Sensitivity over time Accuracy Leak Size, Leak Location 8

9 CPM Other features The Enbridge systems have three or more calculation windows and corresponding leak sensitivity targets. Quick detection of larger leaks and the ability of detecting smaller leaks. Overlapping volume balance sections. Improves sensitivity and robustness. Volume Balance Sections: AB, BC and AC A B C 9 Pipeline

10 CPM Alarm Analysis Leak Detection Analysts Working in the Control Center 24x7x365 Extensive Training Procedures 10 Minute Rule On-Call backup 10

11 Computational Pipeline Monitoring / Leak Detection System Leak detection equipment standards Regular performance measurement of leak detection systems Computer simulations Fluid withdrawal Continuous improvement of procedures, training and maintenance practices 11

12 Leak Detection Testing & Assessment Leak Detection Systems are tested to measure performance of the systems and to drive improvements Several leak testing methods are used to obtain an understanding of the system performance under various operating scenarios Forced parameter Simulated leaks Fluid withdrawals 12

13 Leak Detection Research Update Acoustic/Pressure Wave System Reduce detection time through detection of the onset of a leak. Continued assessment of this technology will proceed through PRCI. Evaluation of external to pipe leak detection technologies A large scale test apparatus has been designed, built and commissioning for the evaluation of external leak detection (ELD) cable based technologies. Joint Industry Partnership established. 13

14 In-line Inspection Leak detection Tools Acoustic Pig and Acoustic Ball Listens for leak signatures Extremely sensitive Integrity Inspection Tools 14

15 Leak Detection Application of New Technology Examples of new Leak Detection technology deployment Deployment of fiber optic cable on a US pipeline segment. Fiber optic cables are used to detects the leak through changes in temperature and acoustic signals 15 An infrared camera based system in the design phase for deployment at facility in Michigan

16 Leak Detection Investigating New Technology Assessment & Potential Deployment of New Leak Detection Technology Proceed based on substantive improvement to leak detection capability Report to regulator on results and plan 16

17 Questions 17