SISTEMA DE DETECÇÃO DE VAZAMENTO EM TUBULAÇÕES
LEAK DETECTION METHOD
Leak detection with the acoustic correlator permits an analysis of the whole water main system. The method used is based on the analysis and the correlation of vibrations and not on noises detected with the geophone technology. Each pipe segment will be verified with the correlator to detect any possible leak or consumptions.
The principle of correlation : A leak emits noise which propagates along the pipe and in the fluid. The correlator analyses the transmitted signals and determines the transit time (time delay) of the noise to the sensors. Knowing the velocity of the propagation, the correlator determines the distance of the leak position from the sensors.
The correlator and the sensors benefit from the parallel combination of two (2) correlation modes (sampled FFT and Real-Time), allowing the optimalisation of different filter screening and the detection of leaks during the day. Several result graphs (based upon the same measurement i.e. the same sample section) can be displayed with the best result being highlighted. These multiple simultaneous correlations (up to 32) and the automatic checking of results convergence ensure precision of location.
We recommend the verification of a segment after rehabilitation in the event that a leak of lesser importance was concealed by a leak of greater importance.
Following the leak detection results and repairs executed by the owner, a computerized report will be submited. All details pertinent to the localisation and the repair of leaks will be demonstrated with the payback on the investment of a leak detection campaign. The necessary information for the report are :
Type of pipe ;
Pipe diameter ;
Operating pressure (at the repaired segment) ;
Excavation dimensions ;
Equipement and personnel needed for the rehabilitation ;
Type of break ;
Break dimensions ;
Type of repair ;
Backfill material ;
Various costs :
- Personnel ;
- Equipement ;
- Backfill material ;
- Repair material.
Segment analysis after rehabilitation ;
Leak detection sketch.
LEAK LOCATION SYSTEM
The camera is lowered into the manhole using a telescopic boom
The lens allows images to be recorded up to 45 meters (150 feet) away from manhole
Specially designed lighting controlled from inside the truck
The camera is waterproof and multi-directional
The Aqua Zoom mobile unit is equipped with a control center and a mini-recording studio
Identifies sections in need of cleaning (generally, 70% of system is self-cleaning)
Identifies priority sections for inspection with in-line camera (generally, 75% of system does not need further inspection)
Identifies 80% of system deficiencies, which are generally found within 20 meters (65 feet) of manhole
The Aqua Zoom camera normally costs only 25% of the operation of in-line cameras
Cleaning is not required prior to inspection
First step to establish cleaning frequency
Manhole entry is unnecessary
The system is adapted to various field conditions