This paper is an application report. It presents the implementa-tion of KLDS, a leak detection system (LDS) from KROHNE Oil and Gas B.V (Netherlands). KLDS detects leaks and, in case of a leak, determines leak flow and leak location.


KLDS monitors a 112km (70miles) ethylene gas pipeline. It fully complies to two important regulations:

  • USA: API 1130 2nd Edition [1], and

  • Germany: "Technische Regel für Fernleitungen (TRFL)" (Technical Rule for Pipelines), [17]. The general pipeline layout is given by Figure 1, with on main line from ingress to egress and two branches at ingress and egress station, respectively. The application therefore repre-sents a simple pipeline net. Two measurement station at in-gress (Figure 2) and egress (Figure 3) as well as fourteen in-termediate stations (twelve of them with instrumentation) complete the pipeline scheme. The application is characterized by strong redundancy requirements due to the fact, that con-tinuous pipeline operation is strictly required.


KLDS is a Real-Time Transient Model (RTTM) based LDS due to API 1130 2nd Edition [1]. It had been extended previously to an Extended RTTM (E-RTTM) based LDS using pipeline classifier algorithms result-ing in a pattern recognition scheme [11]. KLDS therefore pro-vides newest LDS technology with Zero False Alarm Method-ology being an import important part of E-RTTM techniques. This paper was prepared for presentation at the PSIG Annual Meeting held in Palm Springs, California, 20 October - 22 October 2004. This paper was selected for presentation by the PSIG Board of Directors following review of information contained in an abstract submitted by the author(s). The material, as presented, does not necessarily reflect any position of the Pipeline Simulation Interest Group, its officers, or members. Papers presented at PSIG meetings are subject to publication review by Editorial Committees of the Pipeline Simulation Interest Group. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of PSIG is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledg-ment of where and by whom the paper was presented. Write Librarian, Pipeline Simulation Interest Group, P.O. Box 22625, Houston, TX 77227, U.S.A., fax 01-713-586-5955. Field Tests. Different field tests had been accomplished for KLDS verification:

  • Transient operation tests verify LDS behavior during operation with severe transients.

  • Valve tests provoke pressure and flow waves similar to those stimulated by a leak and therefore can verify KLDS leak detection and leak locating operation.

  • Leak tests by opening a branch valve produce transients identical to those in case of a leak and therefore are very well suited for verifying KLDS leak monitoring capabili-ties. Field tests also serve as sources for the determination of LDS performance parameters.


Ethylene (C2H4, CAS-Nr. 74-85-1) is produced in the petro-chemical industry via steam cracking. The result of this proc-ess is a complex mixture of hydrocarbons in which ethylene is one of the principal components.

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