Research Of Deep-well Anode Cathodic Protection In Urban Gas Pipeline Corrosion Protection

The corrosion problem of city gas buried steel pipeline is key of the safe operation of gas network. Deep well anode cathodic protection technology compared to conventional shallow anode technology , due to the deep well anode bipropellant obtained along the depth, so in low resistivity of deep stratum along the metal structures can obtain more uniform current distribution. Meanwhile,deep well anode bed possesses distinguishing features of little interference to other metal structures and just requires minimum space. In recent years deep well anode cathodic protection technology has been widely used in long-distance oil and gas pipelines, city gas pipeline network and large regional cathodic protection facilities.For various reasons, there are many problems come to being in deep well anode cathodic protection technology practical application. Based on consulting patent and other literature and combined with cathodic protection project of the hypo-high pressure gas pipeline network in Mianyang, the emphasis is mainly placed on the design of deep well anode cathodic protection in this paper, and relevant design optimization scheme has been put forward.Scientific and reasonable design of deep well anode cathodic protection system is the foundation to ensure system normal operation. Combining with cathodic protection examples in Mianyang, the same engineering with multiple deep-well anodes design of cathodic protection three aspects of design parameter selection, determination of cathodic protection mode and the number and location of the cathodic protection station have been analyzed , and the corresponding optimization scheme has been put forward. For the design of deep well anode ground bed, and aiming at the problem of the deep well anode ground bed deep-well anodes designed along the depth direction of soil resistivity problems in the test, Barnes analysis has been introducted and used in engineering practice.For power equipment selection, the present standard of trival formula has been optimized again with theoretical derivation.Make formula simple, practical and meet the engineering requirements. Finally, anode cathodic protection system design is summarized, the key point of the design chain is pointed out, and a set of practical design optimization process is established. The software of deep well anode cathodic protection has been made for designers in the design reference.In addition, this paper makes studies of the basic theory of cathodic protection deep well anode,early implementation of data collection and field investigation. Finally, deep well anode cathodic protection technology has been compared economic analysis. Through the above study, the article draws relevant conclusions for the designers and builders for reference.