After the cathodic protection measures ie the deep well anode bed plus impressed current were adopted for the underground pipeline network of Eureka unit in the refinery of Yangtz Petrochemical Company, the protection voltage was - 0.852 - -2.0. This reduced the leakage by 63.6% compared with that without the cathodic protection and the pipeline operation life could be extended by 20 to 25 years.
The mathematics model of tank bottom cathodic protection is established. Used is a representative hypothesis of current density distribution, simulated is the protective potential of 2 kind of deep well anode cathodic protection systems and the calculated results are compared with analytical formula and spot data.
The advantages of deep well anode embody that there is a relevant distance between the anode and the protected structure, which makes the distribution of protective current evener, and meanwhile, the corrosion disturbance to other buried metal structures reduced.
The New Anode in Deep Well Technology Apply in Area of Cathodic Protection
阴极保护领域的新型深井阳极应用技术
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Deep well anode grounding beds are often prefered because of their effectiveness if there is shielding, disturances or a case in which regional pretection is considered necessary for buried pipe network.But its application is limited by complex engineering and expensive in construction. Here is Presented a simple, effective favricating way of construction, by which it is only 80% more expensive in cost than shallow buried graphite anode grounding bed to build up a 20m deep similar one.
Some problems may occur when applying conventional CP system to a oil pump station which is characterized by limited working area, concentrated production facilities and related pipings, numerous branchings, and complex piping systems. It is the distinguishing feature of local CP system that the subject to be protected is a complex of metallic structures located in a limited area. Based on the practice of CP in a localized pump station,it is pointed out that (1)primary subject for CP shall be the bottom plates...
Some problems may occur when applying conventional CP system to a oil pump station which is characterized by limited working area, concentrated production facilities and related pipings, numerous branchings, and complex piping systems. It is the distinguishing feature of local CP system that the subject to be protected is a complex of metallic structures located in a limited area. Based on the practice of CP in a localized pump station,it is pointed out that (1)primary subject for CP shall be the bottom plates of oil tank,followed by buried or underground pipeline as well as related facilities; (2)the reasonable range of polarized potential for local CP shall be - 0. 85--1. 20 V;and (3) deep well anode is the preferred choice to other anode bed alternatives for local CP system. With the stray current interference going with application of this technique,highly resistant potentiostat plus zinc alloy anode system is used so as to increase drainage protection and eliminate further unsafe factor to the local CP system.
In this paper,an angle drilled anode bed CP system adopted in large tank at abroad is introduced. With a hole-bored PVC pipe installed in this system,the tank/soil potential can be easily measured. Compared with the anode bed uniformly distributed around tank and the deep well anode bed,the protection current of angle drilled anode are more uniformly distributed,which can provide a better protection to the central bottom plate of tank.
deep well anode
深井阳极
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