站场阳极地床的布置Layout of anode ground bed in the station

2022-09-06 浏览次数：129次

站场阳极地床的布置

1、站场管道较好架空安装，不与土壤相接触。

2、站场内接地极要通过通交隔直装置与工艺管网连接(如等电位连接器、直流去耦合器、极性排流器等)。

3、建议站场区域保护采用分布式阳极或线性阳极。阳极要安装在接地极对面，尽量远离接地极。深井阳极电流分布均匀，影响范围大，但保护效果有时不好，经常会对站外管道产生阴极干扰。

4、当接地极与管网直连时，由于接地极对阴极保护电流的屏蔽，大部分阴极保护电流会经过接地极到达管道再回到电源负极，导致埋地管道欠保护。当接地极与管道隔离时，注意阴极保护电流对接地极引起的杂散电流干扰腐蚀。

5、影响阴极保护电流分布的因素是阳极地床位置，与阴极汇流点位置无关，阴极线可以在恒电位仪附近与管道连接，阴极线*延伸到被保护区域。

6、站内设施已经相互连通(管道自身连通或通过接地网连通)时，为等势体，*跨接线(除非怀疑个别法兰接触电阻太大)。

7、站场内可以用牺牲阳极替代接地极，也可以用外加电流辅助阳极兼作接地极。用辅助阳极兼作接地极时，阳极之间用电缆连接，与工艺设备之间安装避雷器或其他高压导通装置。

8、阴极线和零位线可以在站内任何位置与站内管道连接，不一定非要连接到地床位置。

Layout of anode ground bed in the station

1. The pipeline in the station should be installed overhead and not in contact with the soil.
2. The grounding electrode in the station shall be connected to the process pipe network through the AC / DC isolation device (such as equipotential connector, DC decoupler, polarity drain, etc.).
3. It is recommended to adopt distributed anode or linear anode for station area protection. The anode shall be installed opposite to the grounding electrode and away from the grounding electrode as far as possible. The anode current in deep wells is evenly distributed and has a wide range of influence, but sometimes the protection effect is not good, often causing cathodic interference to pipelines outside the station.
4. When the grounding electrode is directly connected to the pipe network, due to the shielding of the grounding electrode to the cathodic protection current, most of the cathodic protection current will reach the pipeline through the grounding electrode and then return to the negative electrode of the power supply, resulting in underprotection of the buried pipeline. When the grounding electrode is isolated from the pipeline, pay attention to the stray current interference corrosion caused by the cathodic protection current to the grounding electrode.
5. The factor affecting the current distribution of cathodic protection is the anode ground bed position, which has nothing to do with the cathode confluence point position. The cathode line can be connected to the pipeline near the potentiostat, and the cathode line does not need to extend to the protected area.
6. When the facilities in the station are connected with each other (the pipeline itself or through the grounding grid), they are equipotential bodies and do not need jumper wires (unless it is suspected that the contact resistance of individual flanges is too large).
7. In the station, sacrificial anode can be used to replace the grounding electrode, or impressed current auxiliary anode can also be used as the grounding electrode. When the auxiliary anode is used as the grounding electrode, the anodes shall be connected with cables, and lightning arresters or other high-voltage conduction devices shall be installed between the anodes and the process equipment.
8. The cathode line and the zero line can be connected to the pipeline in the station at any position in the station, not necessarily to the ground bed.

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