The structure of the cable warning tape is composed of the bottom film and facial mask, the bottom film and aluminum foil, which are firmly combined and integrally knurled. The cable warning tape shall be printed with eye-catching and permanent warning words, which shall not fade. Let's learn about the performance, laying and detection of cable warning tape.

Physical performance of cable warning tape

(1) There is no joint in each roll of cable warning tape.

(2) The peel strength of two layers of plastic film of cable warning tape shall be greater than 0.10n/mm (tensile speed: 25 mm / min).

(3) Each reel of cable warning tape shall be electrically conductive with a resistance less than 20 Ω / 100m (detected with an ohmmeter).

(4) The elongation of cable warning tape shall be ≥ 25%.

Laying of cable warning tape

(1) The cable warning tape shall be laid at 300-500 mm above the pipe top (to ensure that the pipeline will not be damaged during the construction of the excavated tape), but shall not be laid in the subgrade or pavement.

(2) A cable warning tape can be laid above the pipe with a diameter of no more than 400 mm; For pipes larger than 400 mm, two cable warning tapes with a horizontal clear distance of 100-200 mm shall be laid in parallel above the pipes.

(3) During the laying process, the connection of two cable warning tapes shall be overlapped for about 1m. The PE film on one side of the aluminum foil shall be peeled off at the overlapped place to expose the aluminum foil, so that the aluminum foil of the two tapes can be fully contacted. The overlapped part shall be tightly wrapped with plastic tape to ensure that the bonding is firm and can be conducted after power on

(4) At the end of the PE pipe, if the tape is not led out to the ground, the tape shall be peeled 50 cm long to allow the aluminum foil to fully contact the ground. The aluminum foil and the ground form a loop to reduce the contact resistance and improve the detection quality.

(5) During the laying process, a signal source well can be set up to lead out the belt and leave it in the well for 1m for easy detection. wait.

Detection of cable warning tape

Electromagnetic method is commonly used to detect cable warning tape. The induced current of the metal foil contained in the cable warning tape under the action of the electromagnetic field will generate a secondary field. It can be detected on the ground with a detection instrument to determine the position of the cable warning tape.

For example, the active source method of electromagnetic method has strong signal, high accuracy of positioning and depth determination, and is not interfered by other nearby pipelines (the warning tape of the inspected cable needs to have an exposure point).

When in use, one end of the transmitter is connected to the checked tape, and the other end is grounded or connected to the other end of the tape. The detector determines the spatial position of the belt by detecting the change of the magnetic induction intensity generated by the belt.

This is all about the performance, laying and detection of cable warning tape. If you have any questions about this or want to purchase warning tape, please come to our website http://webtest2.daoshangbao.cn Learn more.