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GLD - Gottsberg Leak Detection

A systematic innovation.

The GLD equipment system in detail.

GLD - Gottsberg Leak Detection
The pig detector

The GLD 202 Leak Detector is in a pressureand explosion-proof housing. It is very compactly built. It works in a wide variety of pipe diameters, adapted by the GLD 303 Chassis. The liquid in the pipeline serves to transport it.

Leak detection is based on an acoustic measurement method. Leaks with a flow of more than 5 litres per hour cause a characteristic leaking noise in pressurized pipelines. The detector searches in the ultrasonic range for this noise. Interference caused by pumps, rivers, road traffic, etc, is recognized by spectrographic analysis and classified as harmless.

Each acoustic event is identified with a specific location in the pipe. Any unusual noise can be precisely located within a few meters, depending on system equipment. This is done by time and distance measurement.

The system uses detected sources of interference to measure distance. These are used as acoustic waypoints. If the number of existing sources is not sufficient, additional waypoints, the GLD 500 Marker unit and/or the GLD 600 Pig Detector can be used. The markers continually produce a prominent ultrasonic signal, which is recognized by the detector’s electronics.

The pig detector, however, serves two functions. It marks certain points while traversing the pipeline, and monitors the run. With ultrasonics, the pipe is scanned for leak detectors moving past. When a leak detector is recognized, a signal is conveyed to the control room and a marker signal is sent for a short time.

The number of the necessary marker units and/or pig detectors depends on the length and profile of the pipeline. Upward and downward gradients, which affect the running speeds of the GLD 202, can be marked acoustically. It may be necessary to be able to recognize such sections during later evaluation of the recorded data.

The highest location accuracy is achieved by equipping the chassis with the optional odometer wheels. The distance data from the odometer is later matched with the acoustic markers. The marker units can be fastened to threaded pipeline outlets (Thredolets™) with the GLD 510 Marker Attachment. However, the most flexible arrangement is assembly with the GLD 520 Marker Guide Tensioning Band, which allows them to be fastened to nearly any location on the pipeline. The pig detector assembly is held in place on the pipeline with the Tensioning Band.