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The particle size of coke backfill should be less than 10 mm in diameter and the carbon content should be more than 85%. When the anode is put into the anode pit, attention should also be paid to the thickness of the backfill. The thickness of the backfill filled in the upper and lower parts of the anode should be 150 mm, and the thickness of the surrounding backfill should not be less than 100 mm. The quality of backfill material should be inspected and accepted before it is suitable for pit filling, in which soil and other impurities must be avoided. Moreover, in the process of backfill, it is necessary to tamp the filled filler before continuing to fill it.
During backfilling, the anode cable must be protected. The high silicon cast iron anode cable and anode bus cable should be connected in the junction box. The distance between the surface of directly buried cable and the ground shall not be less than 0.8mm. For the installation of auxiliary anode ground bed, the position of anode ground bed shall be determined according to the cathodic protection plan.
The vertical distance between the anode ground bed and the protection pipeline must be in accordance with the design requirements. The auxiliary anode ground bed should be selected in the environment with low soil resistivity as far as possible, which is conducive to the current output. The anode joint must be sealed and reliable, and there should be no obvious defects on the anode surface. When the construction party receives the anode, it must first carry out the inspection and acceptance according to the product performance index. Because the physical properties of high silicon cast iron are brittle and easy to break, special care should be taken in the process of handling and transportation, so as to avoid fracture due to collision.
Another point is that the anode wire must not be used as a lifting tool when lifting anode. In this way, it is easy to break the connecting wire of the anode, which leads to the abnormal use of the anode. Therefore, it is strictly forbidden to use the lead wire of anode in the process of handling, and the anode should be handled with care. No less than 100 mm fine sand and soil shall be padded around the directly buried cable. Such requirements are mainly to ensure the normal operation of cathodic protection system and the flow of current. In the composition of the whole cathodic protection system, in addition to the quality of the anode, the cable is also very important. Only when they are successfully connected, can the cathodic protection be effective.
Therefore, before the construction of the cable, we should ensure its quality, and also have certain skills to ensure the safety of the cable. A certain amount of allowance should be reserved in the length of directly buried cable, and it can be laid in wave shape to adapt to the sinking of backfill. All cables are connected in the test post.
In the cathodic protection system, the reference electrode is an indispensable part. The reference electrode can be divided into many kinds due to different composition. Long term copper sulfate reference electrode is one of the most commonly used. When using the long-term copper sulfate reference electrode in the construction, pay attention to the prepackaging is placed in the bag containing the packing material, and a copper core cable with a cross-sectional area of 6 square millimeter of high molecular weight polyvinyl chloride.
Shandong Linyi Bosi conductive materials Co., Ltd. is a high-tech enterprise specializing in the production of MMO flexible anode, conductive polymer flexible anode and titanium coated anode, mainly providing cathodic protection technology, engineering design, installation and technical services.
Tel: +86 17568010262£¬0539-3712117.