Leak detection system

Leak detection system (also referred to as LDS) operating principle is based on static and dynamic pressure measurements and pipeline flow control by means of primary transducers with further processing of the results obtained by one of the following methods:

  • balance method;
  • pressure profile;
  • pressure wave;
  • acoustic algorithm.

Major system function is leak detection in the main pipeline (hereinafter referred to as MP) and leakage position finding.

Leak rate,
% of maximum flow
Leak detection time, min Leak localization tolerance, m False responses maximum amount
per month/ per year
0,5 2 ± 100 10
0,4 3 ± 100 10
0,3 4 ± 100 10
0,2 5 ± 100 10
0,1 6 ± 100 10
0,05 7 ± 100 10

“LDS Detector” component performs “leak”  and “false response” event detection along with the constant analysis of algorithms use results.

As the minimal sufficient data is obtained, “LDS training” program automatically sets optimal parameters for LDS detection algorithms. The purpose of the program is to analyze real records and external impacts model signals in a real-time mode in order to estimate system operation quality under various set parameters and to determine optimal detection level. The results are represented by output signals diagrams, that characterize the event energy parameters.

The possibility of leak non-detection by LDS is 0,01, while the reliability of leak detection event (i.e. false alarm possibility) is 0,001.

System functions

  • Constant hermeticity control

    in all operating modes (including suspended pumping mode)

  • WKS

    displays the following information: switch over to the mode with limited leak detection parameters, activation of mode with nominal parameters

  • Signals recording and transfer

    recording and transfer of the signals received from sensor systems by Ethernet channel to the information computation system for further processing

  • Signals modelling

    it is possible to produce external impact signals in accordance with the set parameter for the purpose of system operability control

  • "Training" program

    optimal selection of algorithms operating parameters in the program

  • Adjustment of the parameters

    the user can adjust the parameters of multi-functional leak detector after having selected them in the program, which allows to eliminate the possibility of false warning and alarm notifications

  • Impact detection

    multi-parameter detection of external impacts in the real-time mode based on the measured physical values signals

  • Alarm notifications

    via TCP/IP closed protocol to OPC-server, or via Modbus TCP protocol to the monitoring service equipment, display of the alarm notification messages during the set time period

  • Detection of leak coordinates and time

    in the case of leak detection at the linear section of the pipeline

  • Georeferencing

    display of measured and calculated parameters of external impacts along with their localization at technical or structural schemes or a map

  • Access to data archive

    access to the data archive stored at the data computation complex server

  • Constant data flow

    constant data flow via closed TCP/ IP protocol to the data computation complex

  • Self-diagnostics

    self-diagnostics and test control of pressure sensors operational state

  • Data storage on the server

    with precise time referencing and the possibility of post-event analysis of leak events in automated and manual mode for the set time period for each of the sensors (data storage time: over 3 years)

  • Data transfer to third-party systems

    digitized signals and registered results transfer to third-party control systems

  • Viewing historical events

    viewing of long-term trends (by day, month, year) for evaluation of process dynamics by all or particular parameters

Operating principles

Digital pressure sensors ZET 7112-I and ВС 314  included into the scope of LDS are represented by a primary transducer and a measuring module integrated into a single package. The sensors are mounted on the main oil pipeline. The primary transducer converts the pressure value into an analog signal.  The measuring module performs digital processing of the primary transducer and transfers the pressure value via CAN 2.0 interface in digital format.

Interface converter ZET 7176 collects the data from digital sensors by CAN interfaces and sends it to the server via Ethernet for further storage. The registered data is also sent to the WKS for further analysis and leak detection.

WKS enables analysis of the registered data. In the case, if a leak is detected, the WKS calculates location and time parameters of the leak using the algorithms “pressure profile”, “pressure wave” and “correlational analysis”. The results are shown on the display as a SCADA-project “Leak detection system”.

In order to provide compatibility between LDS and WKS, they should have ZETLAB software, SCADA-system ZETVIEW and SCADA-project “LDS”.

  • SCADA-project "LDS"


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  • SCADA-project "LDS"

    WKS. Leak detection.

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Based on ZETVIEW Software, SCADA-project “LDS” enables automated start of ZETLAB programs, data acquisition, post-event analysis, deployment of leak-detection systems, WKS notifications for control of LDS operation (for the purpose of LDS operating functions control and monitoring results registering both in cartographic and text format, including events log with color messages classification by types). The scope of LDS system also includes OPC-server used for data exchange with servers of dispatching departments.

Interface converter ZET 7177 is used as a backup channel for data communication.

System time synchronization of interface converters and LDS servers is performed by means of GPS/GLONASS synchronization module ZET 7175.

Sensors synchronization and GLONASS/GPS timing of the recorded data are conducted in accordance with IEEE 1588 protocol; timing tolerance is below 2,5×10-5 sec.

LDS operates in real-time mode and provides leak detection both in stationary and dynamic pump modes (in the case if there are no gravity-flowing sections) as well as in suspended pumping mode (in the case if there are no main oil pipeline sections with incomplete filling ratio).

Depending on the leakage flow rate, LDS provides a corresponding message informing of the leakage within a time span from 1 up to 10 minutes from the moment of pipeline hermeticity failure detection.

LDS system allows to suspend some functions of leak detection for the period of duration of the following events:

  • start/ stop of main and boosting pump units;
  • cleaning and diagnostics of the pipeline section controlled by the LDS;
  • start/stop of oil pumping process (at the connection point of linear pipeline section or a pumping station);
  • change of oil pumping rate (at the connection point of a linear pipeline section or a pumping station);
  • technical change-over at the pressure maintenance station;
  • change of rotating frequency of pumping units;
  • change of the parameters of pressure maintenance stations at the output of pumping station or at the linear section of the pipeline;
  • opening/closing of the back-up chamber of the mud baffles at the oil pumping station;
  • opening/closing of connecting gate valve of two parallel lines of the oil main pipe;
  • oil withdrawal for technical needs.

Advantages of the system

Compliance with regulatory documents
Self-diagnostics and test control
Leak detection accuracy
Alarm system efficiency

If you want to place an order for the system, please, fill the Questionary below and send it to zetlab@zetlab.com

LDS Questionary