Testing device for pipeline cathodic protection potential test piece and preparation method of testing device
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A cathodic protection and testing device technology, applied in the field of pipeline protection, can solve the problems of different leak point shapes, polarization potential errors, etc., and achieve the effects of quick and convenient disconnection operation, ensuring accuracy, and protecting test leads
Active Publication Date: 2019-03-01
PETROCHINA CO LTD
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[0005] The existing technology only insulates the connection between the metal test piece and the test lead, and all surfaces of the metal test piece are in contact with the soil, which is different from the leak point shape of the surface coating of the pipeline, and the metal test piece will have a shielding effect and edge effects, resulting in an error between the polarization potential of the metal test piece and the polarization potential of the pipeline
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[0065] In a second aspect, an embodiment of the present invention provides a method for preparing a pipeline cathodic protection potential inspection sheet test device, the preparation method comprising the following steps:
[0066] Step (1), connecting the second test lead 2b and the third test lead 2c to the upper surface of the metal test strip 1 respectively.
[0067] Step (2), the lower surface of the metal test piece 1 is bonded on the workbench, then the lower end of the protective shell 4 is bonded on the workbench, and the metal test piece 1 is positioned in the protective shell 4, while the second The test lead 2b and the third test lead 2c are drawn out from the protective case 4 .
[0068] Step (3), pour the liquid insulating material into the protective shell 4 , wrap the metal test piece 1 in the liquid insulating material, and then solidify the liquid insulating material to form the insulator 5 in the protective shell 4 .
[0069] Step (4), remove the protectiv...
Embodiment 1
[0086] This embodiment provides a pipeline cathodic protection potential inspection sheet testing device, the preparation steps of which are as follows:
[0087] 1) Cut the X60 steel into a metal test piece 1 with a specification of 30mm×30mm×3mm. The surface of the metal test piece 1 is required to be flat, rust-free, and oil-free.
[0088] 2) Use brazing equipment to connect the two wires with a cross-sectional area of 2.5mm 2 , the length is respectively the annealed copper wire of 3m and the annealed copper wire of 1.5m respectively as the second test wire 2b and the third test wire 2c, and one end of the two is respectively welded on the surface of the metal test piece 1, forming brazing Point 7.
[0089] 3) Cut the Φ50mm PVC hollow pipe with a wall thickness of 2mm into a PVC hollow pipe with a length of 50mm as the protective shell 4, then polish the lower end of the protective shell 4 to be smooth with 800# sandpaper, and process the upper end until it is smooth and...
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Abstract
The invention discloses a testing device for a pipeline cathodic protection potential test piece and a preparation method of the testing device and belongs to the field of pipeline protection. The testing device comprises a metal test piece, test lead wires, a universal meter, a protective shell, an insulator and a switch, wherein the test lead wires comprise a first test lead wire, a second testlead wire and a third test lead wire; the insulator is arranged inside the protective shell; the metal test piece is externally coated with the insulator; the lower surface of the metal test piece isflush with the lower end face of the protective shell and is exposed; the first test lead wire, the switch, the second test lead wire, the metal test piece, the third test lead wire and the universalmeter are sequentially and electrically connected; besides, the connecting end part of the second test lead wire and the metal test piece and the connecting end part between the third test lead wire and the metal test piece are respectively and externally coated with the insulator. According to the testing device, the morphology of leakage points of a pipeline surface coating can be accurately simulated, the influence of shielding effect and edge effect of the metal test piece on testing is avoided, and a cathodic protection potential of a to-be-tested pipeline can be obtained by accurate testing; in addition, the testing device has the advantages of simplicity and easiness in operation and long service life.
Description
technical field [0001] The invention relates to the field of pipeline protection, in particular to a pipeline cathodic protection potential inspection sheet testing device and a preparation method thereof. Background technique [0002] At present, the cathodic protection potential of buried pipelines is usually tested to monitor and control the cathodic protection effect of buried pipelines. The testing methods of cathodic protection potential of pipeline mainly include instantaneous power failure method, polarization probe method and inspection sheet method. Among them, the inspection sheet method is widely used due to the advantages of less external interference factors and simple operation. [0003] GB / T 21448 "Technical Specifications for Cathodic Protection of Buried Steel Pipelines", GB / T 21246 "Measurement Method of Cathodic Protection Parameters for Buried Steel Pipelines", and SY / T 0029 "Technical Specifications for Application of Buried Steel Inspection Plates", et...
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