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We
are
an established leader in pipeline leak detection with over
twenty year's experience in development of quality hardware
and software products Our ALDS (Acoustic Leak Detection System)
is the only leak detection system with a track record guaranteed
performance for the following major issues regarding leak
detection, namely,
 Fast detection
time-ASI ALDS usually detects leak within one minute from
occurrence & dash; typically less
than 30 seconds;
Accurate
leak location -calculating leak location with uncertainty
of 30 meters or better.
Detecting
leak with high sensitivity -able to detect small leaks,
typically 1% or less of normal flow
rate and able to detect leak with
shut-in flow.
Applications
include both liquid and gas pipelines, and consists of
single transmission lines, networks,
gathering lines, and transfer
lines.
ALDS is
also the only system with established reliable performance-
very few false alarms-which has been
used not only for pipeline monitoring but also for automatic
control of shut-in valves.
Minimum
maintenance requirements.
Local
module based ALDS continuously detects leaks, even under
loss off communications.
Since
1979, we have been installed and used worldwide for various
applications (liquid, gas, as well as two-phase flow pipelines).
Our user list includes companies such as ABB (Russia), BEB
(Germany), Chin Light Power, CPC (Taiwan), ESSO (Australia),
HPCL (India), Mobil, Northwest Pipeline, Sarpon (Italy), Shell,
TPC, Western Gas, etc.
System
Configuration:
The Leak Detection System includes three major assemblies
and associated communications links:
 WaveAlert®
VII Site Processor (including Transducer / Preamp assembly).
1. Data acquisition.
2. Local data analysis.
3. Built in tests.
4. Report preparation.
5. Communication.
MasterComm™
VII Node Processor.
1. Data analysis (Leak / No Leak).
2. Leak location.
3. Leak size.
4. Built in tests.
5. Communication
Host
Computer with SCADA Software.
1. Communications.
2. Database organization and management.
3. System reports.
4. Graphics format.
Where database includes; scaling constants, system parameters,
alarm parameters, and historic data.
The Acoustic
Leak Detection System operation is illustrated herewith.
How
the System Works:
Wall failure of a pipeline under pressure is a sudden event,
which occurs when internal pressure produces a sudden rupture
in a weakend pipe wall. When the hole forms, fluid escapes
in the form of a high-pressure jet. Fluid loss produces a
sudden pressure drop within pipeline, which propagates in
both directions as acoustic signals with the following characteristics:
The pressure loss propagates over large distance within the
pipeline
due to low signal absorption and because
the pipe walls guide the
wave fronts.
Wave fronts
propagate with the speed of sound in the fluid.
Pressure
loss is detectable as low frequency acoustic signals.
Acoustic
signal amplitude increases with leak size.
The WaveAlert®
Acoustic Leak Detection System makes use of these characteristics
to inform the operator:
- That
the leak has occurred.
- Where
the leak is located.
- The
leak is either large or small.
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The Wave
Alert Vll ALDS is designed to detect the occurrence and location
of leak in pipeline. |
 On
atypically Leak Detection System, the Wave Alert Vll monitors
are placed at the ends of the pipeline segment and at block
valve sites along the pipeline. These monitors consist of
two separate assemblies- a pressure Sensor Assembly, and a
WaveAlert Vll Site Processor. The Site Processors monitor
the acoustic sensor outputs for transient acoustic wave created
by release of fluid during rupture of the pipeline. The Site
Processors perform local digital processing and upload key
real-time parameters to the Master Comm Vll node processor.
The Master Comm Vll node processor evaluates data from all
site processors and determines if a leak has occurred, and
if so, determines the location of the leak. This information
is then sent to a local monitor and control system.
Our
systems employ proprietary hardware for acoustic leak detection
and associated hardware and software for supervising communications,
structuring database, data analysis, decision-making, report
and display generation and issuing alarms. Systems employ
combinations of radio, fiber optic and hardwire communications
with either personal, or mainframe computers for operator
interface.
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