Leak Detection System Technologies

ALDS is a negative pressure wave pattern-recognition, adaptive, and hydraulic-based wave model leak detection and location system capable of rejecting noise by various hardware, firmware, and software methods. Please keep reading to learn more about leak detection system technologies.

The Acoustic Leak Detection System is designed to detect the occurrence and determine the location of leaks in gas, liquid, and multi-phase flow pipelines. A transient acoustic wave is created at the instant of a break in the pipe wall. This acoustic wave travels at the speed of sound, for that fluid is guided by the pipe's walls in both directions from the source of the break.

The acoustic wave is detected by sensitive acoustic sensors and analyzed by Wave Alert Site Processors situated along the pipeline. After further analysis by the Master Comm, the leak's location is determined from the arrival times of the expansion waves at the sensor locations.

The ALDS system will continue to detect a leak in case of communication fault or loss of communication. After the resumption of communications, the leak event and detecting time from the local processors will be used for leak location calculation by the central processor.

Leak Computer HMI

The central information and data handling unit is the Leak Computer (dedicated PC). It communicates with the MasterCommTM VIII Node Processor and supports SCADA by various hardware, firmware, and software, which provides operator input/output, and produces printed reports and messages.

It provides the quickest leak detection, high sensitivity, precise leak location accuracy, and low false alarm rate with minimum maintenance requirements.

Customer SCADA Interface

The ALDS can provide an interface to an existing customer SCADA system. The existing customer SCADA system can adjust all local and remote operational and tuning parameters. This interface can be provided through the MasterCommTM VIII Node Processor or the ASI Leak Computer.

System Performance

  • Quickest leak detection - detect leaks within 60 seconds, independent of leak size.
  • Most accurate leak location - locate leaks with25 to 35 meters (or less). Very effective theft detection/deterring system.
  • Most Reliable (Lowest false alarm rate) -- less than one false alarm per year (the only leak detection system used for automatic valve shut-in when a leak is detected, field-proven record of detecting and the shutoff valve, prevent disaster a casualty).
  • High sensitivity, detect leaks as small as 0.1% or less of liquid flow (0.1 inches or smaller) or 0.001% to 0.1% of gas flow depending on background noise and sensor span.
  • Detects leak under ALL operations (pump start-up/shut-down, valve open/close, steady & unsteady flow, etc.).
  • Detects leak with or without flow (shut-in or zero flow rate).
  • Detects leaks during the loss of communication or communication faults (GPS)

MasterComm Node Processor Compliance With International Standards

ASI fits in the classification of API1130 leak detection methods.

However, our LDS Acoustic based incorporates further unique features which exceed the classification of API 1130 leak detection technologies due to built-in patented advanced features:

  • Hydraulic modeling filters.
  • Advanced signal processing algorithms.
  • Adaptive algorithms for false-alarm rejection.

Acoustic Leak Detection is not based on flow measurements but instead on detecting unique acoustic signals produced by pipeline leaks. No high-accuracy pressure measurements are required for leak detection. No intensive maintenance.

ASI is an ISO-9001 certified company, full in compliance with design and manufacturing processes

System Recovery from Malfunctions

Communication Failure: During a communication outage, the WaveAlert® Site Processor will automatically store up to 100 events (potential leaks) for 24 hours. Once communications are restored, the GPS time-tagged events are sent to MasterComm for processing.

Power Outage: All critical parameters are stored in non-volatile memory.

Loss of WaveAlert®: If one WaveAlert® Site Processor is offline, WaveAlerts on each side will continue to detect leaks.

Loss of Sensor: For dual sensor WaveAlerts, if one sensor is lost, the WaveAlert will still function with a single sensor.

Field Leak Test Kit

WaveAlert® Batch Tracker

The WaveAlert® Batch Tracker monitors multiproduct pipelines and calculates the location of products inside pipelines.

The WaveAlert® Batch Tracker is a function added to the WaveAlert® ALDS. It requires precise flow data inputs from the pipeline along with density or product information.

WaveAlert® Batch Tracker

Allows for scalable configurations.
Handles multiple equipment types (valves, pumps, tanks, flow meters, etc.).
Provides real-time information on the product location.
Calculates and monitors interface volume between batches.
The WaveAlert® Batch Tracker is fully configurable and works on simple topologies with a small number of pipelines to complex topologies.

WaveTrack® ASI Scraper Tracking System (ASTS)

WaveTrack® is a real-time Scraper Tracking System that accurately detects scraper position and velocity. WaveTrack® consists of hardware and software components: the self-contained acoustic module Acugen®, a low-powered device that installs easily inside the cavity of a pipeline scraper; a WaveTrack® field processor or a WaveAlert® VIII-STS Integrated Leak Detection and Scraper Tracking processor. These local processors report to the WaveTrack Master® central processor as part of the stand-alone ASI Scraper Tracking System (ASTS) or to the integrated MasterComm® VIII-STS central processor to complete the powerful integrated system (ILDSTS). The ILDSTS can deliver the proven ASI leak detection and location functions and accurately detect the scraper speed and location.

WaveTrack® is comprised of five compact modules: the self-recharged battery module, the control module, the Acugen® module, the Self-Release® system, and the suction/release nozzle. All WaveTrack elements come in a practical framework to ensure easy and quick installation inside any commercial pipeline scraper.

RTTM LDS Virtuoso®

Production, pipeline & asset management systems
Wood Group provides robust, real-time online and offline software systems for efficiently managing oil and gas operations.

Virtuoso® is a field-proven suite of software products with more than 20 years of successful track record of performance in the field.

Our technology supports engineering studies, operator training, simulation wells, pipelines, and processing facility operations onshore and offshore. For example, Virtuoso is used to help manage some of the world's key gas resources, supporting 10% of the global consumption of this vital commodity.

Our software products provide essential operational and commercial functionalities based on the unique challenges specific to each customer project. Our technology solutions address the most complex single and multi-phase gathering, production, transportation, and processing issues.

RTTM LDS Virtuoso®

The Virtuoso software suite includes offline
packages such as:

  • Virtuoso/ES - Engineering simulator
  • Virtuoso/OTS - Operator training system
  • The online packages include:
  • Virtuoso/Monitor - Operations monitoring
  • Virtuoso/Advice - Operations advisory
  • Virtuoso/LDS - Leak detection system
  • Virtuoso/Control - Operations control
  • Virtuoso/Optimize - Operations optimization
  • And planning
  • Virtuoso/VMS - Virtual metering system®
  • Virtuoso/Analytics - Data analysis and
  • Processing

Pipeline Management System Online Applications

Virtuoso/Monitor is an online, real-time, dynamic system in one integrated model for monitoring oil and gas production operations, from subsea wells to topsides equipment. Monitor's functionalities can include:

  • Liquid's inventory.
  • Management.
  • Line pack monitoring.
  • Hydrate warnings.
  • Leak detection.
  • Performance monitoring.
  • Pig tracking.
  • Restriction detection module (RDM).
  • Instrument and equipment surveillance.
  • Composition and chemical tracking.

Monitor's breadth and depth of functionalities make it an essential tool for monitoring production and processing facilities.

Dynamic Simulation Package

Virtuoso/ES (Engineering simulator) is a dynamic simulation package that performs fast transient single and multi-phase simulations of integrated subsea, topsides, and onshore facilities.

ES includes a rich graphical user interface with integrated plotting to eliminate complex files and spreadsheet-based analysis.

With a control emulation function and built-in capability to start from real-time process measurements, ES is a world-leading package for analyzing integrated pipeline networks and processing facilities.

Virtuoso/OTS (Operator training system) features are coupled for realistic, comprehensive operator training.

OTS can interface directly with offline distributed control systems(DCS), supervisory control and data acquisition (SCADA) systems, or emulate operator interfaces. OTS is an effective tool to quickly familiarize new operators with production systems and the overall production system, prepare operators for normal and unusual operating scenarios, and document competency levels.

OTS functionalities include instructor/student workstations, user configuration of training scenarios, automatic recording and documenting of training sessions, and objective scoring of operator performance.

RTTM LDS Virtuoso/LDS (Leak Detection System)

Virtuoso/LDS (Leak detection system) uses robust field-proven simulation technology. Our software supports single and multi-phase operations with rigorous mathematical modeling using the pipeline's mass and pressures transient analysis. LDS also provides a comprehensive, statistical signal trend analysis with a proprietary method. A dynamic leak 'fingerprint' recognition algorithm maximizes sensitivity to leaks, reducing detection time while minimizing false alarms.

Key attributes of the software are:

  • Built on Wood Group's Virtuoso modeling technology.
  • Real-time transient model (RTTM) with model compensated volume balance error signals and pattern-recognition algorithm.
  • Leak detection probability with alarm notification.
  • Detection details include location, rate, and cumulative release amount.
  • Operates in steady state, transient, and pipeline shut-in conditions.

Fiber Optic Pipeline Monitoring LDS Preventing and Detecting Leaks in Real Time

Get More from a Single System

Detect, locate and classify multiple threats in real-time, along the full extent of your pipeline, with the fiber optic pipeline monitoring system.

Fiber Optic pipeline monitoring system

Working Principle

Fiber Optic sensing system measures the time delay from the transmission of the laser light until the disturbance signal is received.

No signal return is required from the end of the optical fiber.
It emits a laser pulse down a fiber optic cable to measure vibration and temperature. It will also locate the position of the vibration and temperature being measured

Mitigate the Risk of External Pipeline Threats

Pipelines are susceptible to various external threats that can result in significant damage, or worse, a rupture. However, a majority of these incidents can be prevented. In addition to leaks, the Fiber Optic pipeline monitoring system detects the external events that lead to pipeline damage, so you can respond to threats before incidents occur.

Offering third-party interference monitoring and right-of-way detection, our system alerts pipeline operators of potentially hazardous activity occurring within the pipeline corridor, such as digging, vehicle movement, and other large machinery, before contact with the pipe is made. Utilizing the fiber optic network around remote facilities, the system can also detect threats and unwanted activity near above-ground infrastructures, such as block valves, refineries, and pumping/compressor stations.

Protect Pipeline Infrastructure

Sabotage and theft are other threats that can significantly impact pipeline integrity, as well as an operator's bottom line. Protecting pipelines in high-risk areas typically requires a separate leak detection and security monitoring program, but the Fiber Optic pipeline monitoring solution can do both. Integrating leak detection, security monitoring, and theft prevention into a single system, the pipeline monitoring solution provides the sensitivity and reliability required to detect and locate suspicious activity, such as illegal hot taps and vandalism, up to 100km from a single location. With this knowledge, you improve incident reduction and increase the effectiveness of response mechanisms, such as ground patrol and helicopter reconnaissance, by ensuring manual inspection is focused on areas of real activity.

Monitor Seismic Disturbances

Sizeable ground shift and rock fall events can also be detected with the ground movement monitoring application. By recording all activity in the vicinity of a pipeline before and after a large, widespread disturbance, such as an earthquake, engineers can understand the resulting damages and whether asset integrity has been compromised.

Fiber Optic System LDS Advantages

Multi-Threat Detection

  • Leaks
  • Ground movement
  • Condition monitoring
  • Inline inspection tool tracking
  • Third-party and right-of-way interference

Optimal Performance

  • Faster, more sensitive threat detection and classification.
  • Rapid, more accurate threat location. Smarter, more reliable alarms.
  • Consistent, more robust system performance. High-quality data and reliable communications.

The Flexibility

  • Customize a system for your specific pipeline environment.

Reduced Installation Costs

  • Eliminates the need for redundant systems and hardware.

Advanced Sensing

  • Measures acoustics temperature, pressure, strain, and orifice noise.
  • Eliminates conversion and computational errors.
  • Performs in the transient, slack-line, and multi-phase flow.
  • Monitors longer distances using thousands of distributed sensors.
  • Provides localization accuracy of ±10m.