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Pipeline Technology Journal 2-2015

Latest developments and news from the pipeline industry

Following thorough consultation, the company opted for the PipePa- trol leak detection system. KROHNE commissioned, configured and tuned the system on site. During the project execution according to ISO 9001 standards, the documentation to fullfil CSA Z662 Annex E requirements was created and handed to the customer. PipePatrol used the measurement values provided by the process control sys- tem and was integrated into the pipeline monitoring system at the customer’s request. The leak tests performed for the site acceptance tests were conducted using valves in the pipeline to simulate leaks by real fluid withdrawal into a vacuum truck. The following results were achieved: The first pipeline is a condensate pipeline with a length of 24690 m / 15.34 mi. The location of the fluid withdrawal was close to the outlet flow meter of the pipeline. The detection threshold for leaks is set to 1.1 m³/h / 4.84 gal (US)/min . After starting the leak test with a leak rate of 5 m³/h / 22.01 gal (US)/min, the system recognized the signa- ture of the leak within 55 sec and went to “Leak Signature Detected” state. After 2:30 min, it reached the desired statistical confidence lev- el and raised the leak alarm. At this point, only 208 l / 54.95 US gal were spilled. Gradient intersection method calculated a leak position of 24689 m / 15.34 mi, while Wave propagation method calculated a leak position of 24677 m / 15.33 mi, both less than 0.1% of pipe- line length away from the real leak position. The second pipeline is a sales oil pipeline with a length of 59700 m / 37.1 mi. The location of the fluid withdrawal was close to the inlet flow meter of the pipeline. The detection threshold for leaks is set to 3 m³/h / 13.21 gal (US)/ min. After starting the leak test with a leak rate of 3.5 m³/h / 15.41 gal (US)/min, the system recognized the signature of the leak with- in 50 sec and went to “Leak Signature Detected” state. After 6:40 min, it reached the desired statistical confidence level and raised the leak alarm. At this point, only 380 l / 100.39 US gal were spilled. Gra- dient intersection method calculated a leak position of 0 m / 0 mi, less than 0.1% of pipeline length away from the actual leak position. Wave propagation method was disabled for this test because time stamping was temporarily not available for the measurements, but has been activated in the meantime. CONCLUSION Modern leak detection systems are based on various mathematical and physical models. The pipeline properties as well as regulatory re- quirements must be taken into account when selecting a system. The most advanced technology currently available is the E-RTTM model. E-RTTM-based leak detection systems guarantee reliable leak moni- toring for various types and lengths of pipelines, even under transient operating conditions. KROHNE supplies the PipePatrol E-RTTM- based leak detection system either installed on separate hardware or for integration into an existing control system and measurement installation. Author Daniel Vogt KROHNE Messtechnik GmbH Product Manager Pipeline Leak Detection Systems Duisburg, Germany d.vogt@krohne.com RESEARCH / DEVELOPMENT / TECHNOLOGY 28 PIPELINE TECHNOLOGY JOURNAL Are you looking for a sensitive and reliable leak detection system? PipePatrol from KROHNE is the answer. KROHNE is a full-service provider for process measuring technology. For pipeline transportation networks, KROHNE offers a broad range of measurement solutions. The E-RTTM based leak detection system PipePatrol is the most sensitive internal leak detection system available, providing very fast and accurate leak detection and localisation in pipelines. Unlike other systems, PipePatrol does not simply use one method for leak detection and localisation. Instead, it combines several API 1130 methods seamless into one system. It provides the speed of wave rarefaction systems, the accuracy and benefits like hydraulic profiles of RTTM based systems, and the robustness and reliability of statistical methods. Over the last 15 years, PipePatrol has been successfully implemented on more than 250 gas and liquid pipelines throughout the world, easily meeting or exceeding all applicable quality and performance regulations, such as the German TRFL, CSA Z662 Annex E, and the American API 1130. KROHNE – The pipeline industry is our world. Please see our website for more information: www.krohne.com/leak-detection Outstanding Leak Detection Advertisement

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