Buried storage tanks use flexible anode Mmos

Buried storage tanks use flexible anode Mmos

First, flexible anode introduction

The main applications of flexible anodes are in storage tanks and buried pipelines. The auxiliary anode is just beginning to appear in order to prevent the aging of the old pipe, the protection of the current will become large, the general traditional method has no way to solve the place. Through practical research, it is found that the application prospect of flexible anode is very broad. Flexible anode is a threat to the traditional cathodic protection methods. It can successfully solve some problems that the traditional cathodic protection methods cannot do. The conductive plastic is used to make the flexible anode, which is wrapped around the copper core so that it has the same structure and shape as the cable, so it is also called a cable anode.

The basic structure of flexible anode is: internal anode core material + filled coke powder + outer wrapping fabric + outer mechanical weaving protection net, because it can be flexible bending, the shape of a thicker cable and become a flexible anode or cable anode.

According to the internal anode core material, flexible anode can be divided into two kinds, one is the early conductive polymer flexible anode with thermoplastic conductive polymer as the anode, which is represented by Ruikan products; The other type of flexible anode is composed of A combination of MMO/Ti wire and internal conductive cable. Its anode material is MMO/Ti wire, which overcomes the disadvantages of relatively small discharge density and unsuitable for large discharge density of the original generation of flexible anode, and combines the advantages of high discharge density and long service life of MMO/Ti anode. At present, two kinds of flexible anodes coexist in the market. However, from the perspective of future development trend, MMO/Ti based flexible anodes have obvious advantages and have begun to show strong growth momentum.

Buried storage tanks use flexible anode Mmos

High quality noble metal oxide MMO coated anode wire, with high current impact resistance, long service life, high discharge line density advantages;

2, parallel copper core double insulating layer conductive cable parallel conductive cable is double insulation sheath, the outer sheath is PVC sheath, with acid resistance, oxidation resistance and long service life advantages;

3. In addition, the copper core of conductive cable with sufficient cross-sectional area can fully meet the requirements of anode current carrying capacity and current attenuation;

4. Special anode filled coke with high conductivity and high carbon content and special chemical treatment can effectively extend the service life of MMO anode core wire, reduce ground resistance and increase discharge density;

5, wrap acid-resistant fabric with a certain water permeability, air permeability of the wrap fabric, the coke packing densely wrapped around the anode core, ensure the dimensional stability of the flexible anode, and the integrity of the flexible anode during the use of;

6, external mechanical braided protection mesh layer wear resistant, high strength braided mesh layer can provide good mechanical protection for flexible anode inclusion, to prevent mechanical damage caused by dragging during construction.

7, the arrangement is simple, flexible and flexible anode can be laid directly close to the pipeline, directly implement the protection of the pipeline, greatly reduce the current loss, improve the protection of current use efficiency. At the same time, because the flexible anode is pre-packed with high quality special coke packing, the installation can be directly buried, eliminating the laying of coke packing process, greatly reducing the construction workload. At the same time, because the flexible anode can be flexible bending, can adapt to the complex shape of the protected object, to achieve high efficiency of targeted protection.

8, small stray current interference due to close to the protected object buried, can minimize the stray current interference to other metal structures, to avoid additional losses;

9. High discharge density, low grounding resistance, high discharge density and long service life. At the same time, due to the long distance laying characteristics of the flexible anode, the protection of the pipeline can achieve a low grounding resistance, which is conducive to reduce the output of the system, improve the economy of cathodic protection.

10, the MMO anode used in flexible regional cathodic protection technology advantages regional cathodic protection refers to a particular factory (such as oil QiZhan, petrochemical refinery plant, power plant, etc.) within the scope of the buried metal facilities, such as: the process piping, fire pipeline and other ground system, unified implementation of cathodic protection cathodic protection technology. It is difficult to adopt the traditional distributed anode protection technology. To ensure the success of the project, the design and construction personnel have rich experience and high technical level. It is often necessary to adopt measures such as "step-by-step construction". Even so, it is difficult to ensure the uniform potential distribution of all protected objects and completely avoid the occurrence of "interference and shielding" problems. Because of the technical advantages of flexible anode, the problem of "interference and shielding" can be effectively avoided. At the same time, the difficulty of design and construction is greatly reduced, and the success rate of project implementation is easy to be guaranteed. At present, it has become a technical trend to use flexible anodes for regional cathodic protection in complex network stations.

Application scope of MMO flexible anode

Regional cathodic protection for buried metal facilities in oil and gas stations, refineries, petrochemical plants and power plants

Compared with mMO-based network anode protection, mMO-based flexible anode has the advantages of easy installation, no need for welding, high system reliability and relatively few materials.

Regarding the period of the special section such as pipeline cathodic protection for regarding the period of high soil resistivity area, such as using flexible anode can effectively realize the full protection of the pipeline, at the same time, cooperate with our company's small solar potentiostat, can realize the power supply is difficult to enforce the protection of the pipeline section effective access area, and implement maintenance free.

Coating aging pipeline cathodic protection for pipe coating aging is serious, the traditional distributed anode unable to achieve effective protection situation, it may be traditional for the pipeline overhaul, of the pipeline by flexible anode cathodic protection system, can be on the premise of guarantee the pipeline, reduce the risk of corrosion, the pipe from overhaul, reduce the cost of pipeline maintenance.

MMO flexible anode technical specifications Project specifications Product Number

(P- Pipeline protection. S- Tank protection.D- distributed anode use)

Combined flexible anode body outside diameter 40mmMMos Anode core diameter 1.0-2.0mm (single or multiple wires)

Output current (Max.) 300-1500mA/M

Design life ≥20 years

Filling toner carbon content ≥98.5%

Toner resistivity 0.05-15 ω ·cm

The anode weight is 1.2Kg/M

Each reel of anodes is 100 m, 200 m, 300 m,400 m in length

Special connection kit with no less than 5 layers of waterproof insulation seal.

Three, flexible anode characteristics

(1) The output voltage is low, so the voltage converter capacity can be smaller;

(2) the current utilization high, due to the flexible anode belongs to near anode (closer to protect objects), therefore, can ensure that the vast majority of cathodic protection current will flow into the protection object, because other than protection and the protection of the leakage current is the lowest, this is also a flexible anode cathodic protection for other reasons not little interference protection object;

(3) The cathodic protection potential is evenly distributed along the size of the protected object;

④ The interference to other devices is very small.

The cable with lightning protection measures is strengthened with galvanized steel wire without additional protective layer outside the plastic protective layer, which can improve the leakage load of the cable sheath. This reinforcement is usually a 2mm thick flat strip of steel, which is particularly susceptible to corrosion in soil. In order to ensure the lightning protection function during the effective life of the cable, cathodic protection should be implemented for the reinforced steel strip.

Four, flexible anode matters needing attention

(1) First of all, it is necessary to determine the required protection current to determine the protection current according to the condition of the protective layer of the protection pipeline, and then the density of the protection current can be selected. The required current over the protection area multiplied by the density of the current can be obtained.

(2) The second is the design of the circuit, to ensure that the design of the flexible anode circuit, can ensure that the entire length of the current distribution and ensure uniform distribution, the maximum length of the circuit can be calculated from the beginning of the junction point can get the maximum length of the anode. The subsequent current feed point is calculated according to the maximum length of the loop.

(3) Choose the appropriate power supply equipment specifications, flexible anode also has its special place, its special place is the low resistivity between Yin and anode, considering is a very long conductor, it is necessary to use non-standard calculation.

(4) The last step is to select accessories, select flexible anode accessories should be based on the way of wiring.

Buried storage tanks using flexible anode Mmos MMO flexible anode nodes every 3 meters.