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​shengli SL-2098 Detector for Outer Anti-corrosive Coating Conditions on Buried Pipelines

【Function and Purpose】

    Without excavation, the outer coating condition detector is able to find out the position, running direction, depth of underground metal pipes, as well as the damaged points and their number, size, and distance between them on underground metal pipes in a convenient and accurate way.

【Purpose】

Acceptance on pipes in compliance with the standards of SYJN4029-88 and GJJ33089;

Completion acceptance on newly laid pipes;

Regular detection on pipes according to safety regulations to confirm the cathode protection effects;

Location of branches on the main pipeline;

Testing of old pipes to determine if they need overhaul or not

Check on underground pipeline distribution before excavation at the construction section, in order to prevent the underground pipelines for oil, gas, water, electricity, etc. from being destroyed during construction.

 【Characteristics】

A brand new technology of digital filtering used to set the range of leakage points, to record their number automatically and to display the distance between them precisely;

Various detection methods are available, with automatic changeover, and the transmitter sends a reminder signal to the receiver before battery under-voltage and auto power-off, the data automatically saved at power-off;

Possibility of automatic measuring the pipe-to-earth resistance, with high-frequency alarm signal output, of extremely strong anti-interference capability; Power output of the transmitter adjusted as the detection distance increases, and the transmitter automatically power off when detection finished, which improve the detection effects of the equipment and extends the life time of the battery.

【Primary Technical Parameters】

A. Technical parameters of the transmitter:

Power: 5-25W, adjustable automatically

Output impedance matching: 5-500Ω

Transmitting distance: 0.03-5Km,able to be moved beyond 5km gradually

Working power supply: 12VNiCd battery

weight: 3.5Kg

Overall dimension: 245×236×105

B. Technical parameters of the pipe locator  

Sensitivity: 0.1mV

Positional deviation: 5cm

Investigation depth: 5m

Recorded distance precision: 0.1% of detection distance

Working power supply: 9.6V NiCd battery

Overall dimension: 185×135×110

C. Technical parameters of the leakage detector:

Leakage detection accuracy0.25mm2

Working power supply: 9.6V NiCd battery pack

Overall dimension: 185×135×110

【Detection Principles and Methodology】

    Principle and methodology for running direction and buried depth detection: determine the position, running direction and depth of underground pipelines by detecting the magnetic field of underground pipelines via sending a specified high-frequency modulated signal to underground pipelines.

【Methods: peak method and zero method】

    Detection principles and methodology: by sending a specified high-frequency modulated signal to the underground pipeline, the loop is formed between the damaged point on the coating and the earth, which radiates to the ground, with the strongest signal right above the damaged point. That’s the principle how we can find out the damaged point on the coating.

    The coating condition detector adopts “body capacitance method”, i.e., with human body as the induction element of the leakage detector. When the operator walks close to the leakage point, the leakage detector begins to react. When he is right above the leakage point, the volume in the loudspeaker is the highest and the displayed value is the largest. That’s how we can find the leakage point.



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