Cathodic Protection Technology nyob rau hauv Ntev -Cov Roj & Roj Pipelines

Cathodic tiv thaiv thev naus laus zis yog ib qho tseem ceeb los tiv thaiv- kev ntsuas corrosion kom ntseeg tau lub sijhawm ntev -kev nyab xeeb ntawm cov roj thiab cov kav xa hluav taws xob.

• Av corrosion
• Fais fab tam sim no
• Txheej tsis xws luag
• Microbial corrosion (MIC)

1. Sacrificial Anode Cathodic Protection (SACP)

Application Scenario:

• Luv -cov kav dej nyob deb.
• Tej thaj chaw deb uas tsis muaj hluav taws xob ruaj khov.

Common Anodes:

• Magnesium alloy (Mg): High tsav voltage (qhib-circuit peev xwm -1.7V vs. CSE), haum rau high-resistivity av.
• Zinc alloy (Zn): Tsawg tsav voltage (qhib-circuit peev xwm -1.1V vs. CSE), haum rau cov av tsis tshua muaj zog.

Installation Methods:

• Sacrificial anodes faus rau ntawm ob sab ntawm cov kav dej, txuas nrog cables.

2. Txaus siab rau tam sim no Cathodic Protection (ICCP)

Siv tau Scenarios:

• Ntev - kis tau tus mob kav.
• Chaw nres tsheb faus pipelines.

Core Components:

1) Pab anodes:

• High-silicon cam khwb cia hlau anode (HSCI): Acid-tiv taus av sib xws, 15 ~ 25-xyoo kev pab cuam lub neej.
• MMO anode: Lub teeb yuag, siab tso zis tam sim no, 20 ~ 30 xyoo kev pab cuam lub neej.

2) Transformer rectifier:

• Muab cathodic tiv thaiv tam sim no, txhawb ntau hom kev ua haujlwm (tam sim no / muaj peev xwm / voltage), nrog rau cov chaw taws teeb saib xyuas (wired / wireless / mobile networks).

3) Anode av txaj:

• Cov txaj hauv av ntiav: Kev teeb tsa yooj yim, kev tsim kho yooj yim, hneev taw loj.
• Deep well ground beds (>30m): Compact hneev taw, tsis tshua muaj av tiv thaiv, niaj hnub faib.

4) Siv electrode:

• Ntev -lub neej tooj liab sulfate electrode (CSE): faus ze ntawm cov kav dej, qhov tseeb ± 10mV.

1. Sectional Protection Design

Zoned fais fab mov:

• Ib qhov chaw tiv thaiv cathodic ib 50-100km, ntsuas kev tiv thaiv kev ua tau zoo thiab kev ua haujlwm zoo.

Case:

• West-Tebchaws Gas Pipeline chaw nres tsheb txhua 80km, rectifier fais fab 5kW.

Insulating pob qij txha:

• Nruab ntawm cov chaw nres tsheb thiab lub valve chambers los tiv thaiv kev poob tam sim no.

2. Dynamic Stray Current Mitigation

Kev ntsuas dej ntws:

• Direct drainage: Pipeline txuas ncaj qha rau hauv av lub cev.
• Kev tso dej yuam kev: Dynamic thim rov qab tam sim no tso tawm los ntawm nrawm- teb rectifiers kom tsis txhob cuam tshuam.

Kev soj ntsuam systems:

• Cov chaw kuaj mob: Rau kev ntsuas kev ntsuas ntawm kev tiv thaiv muaj peev xwm, anode tso zis tam sim no, thiab stray tam sim no.
• Smart xeem chaw nres tsheb: Nruab nrog cov ntaub ntawv tau txais / kev sib txuas lus modules rau automated detection thiab tej thaj chaw deb cov ntaub ntawv kis tau tus mob.

3. Txheej -CP Synergy Optimization

Txheej -CP kev sib raug zoo:

• Kev tiv thaiv ua ke nrog lub luag haujlwm ntxiv; CP tsom mus rau txheej txheej tsis xws luag / tsis muaj zog.
• Cov txheej txheem zoo dua txo CP tam sim no thov.

Tam sim no qhov ntom ntom tsim:

• Cov kav dej tshiab: 0.01-0.05 mA / m² (cov txheej txheem tsis zoo).
• Cov kav dej muaj hnub nyoog: 0.1-1 mA / m² (qhov xav tau nce tam sim no rau cov txheej puas).

1. Kev soj ntsuam tas li

CIPS (Kaum Lub Sijhawm Muaj Peev Xwm Kev Tshawb Fawb):

• Tag nrho -kab kev soj ntsuam muaj peev xwm txhua 2 xyoos (kuaj chaw nres tsheb ntawm 1km ib ntus).

DCVG (Direct Current Voltage Gradient):

• Nrhiav cov txheej txheem tsis xws luag (± 0.5m raug).

2. Kev soj ntsuam ntse

SCADA kev koom ua ke:

• Cov chaw taws teeb rectifier parameter hloov thiab tiag -lub sij hawm txawv txav lub tswb.

Kev soj ntsuam ntse:

• Cov chaw kuaj ntse ntse raws cov kav dej saib xyuas kev tiv thaiv muaj peev xwm thiab tsis muaj kev cuam tshuam tam sim no.

• Sab hnub poob-Tebchaws Gas Pipeline III Fujian-Guangdong ceg (Guangzhou-Chaozhou seem).
• Chaozhou City High-Pressure Natural Gas Pipeline (96.5km) CP project.
• Zhuozhou-Yongqing Natural Gas Pipeline (82.35km) CP project.
• Tuam Tshoj-Russia East Pipeline (Yongqing-Shanghai) Taian-Taixing Tshooj Phase VII.
• Ningbo-Taizhou-Wenzhou Natural Gas, Zhejiang-Shanghai Gas Interconnection, Guodian Nanxun Fais Fab Kev Pabcuam, thiab Shangyu-Xinchang Natural Gas Pipeline tej yaam num.

1. International:

• TS EN ISO 15589 -1 "Petroleum, petrochemical thiab natural gas industries - Cathodic kev tiv thaiv ntawm cov kav xa hluav taws xob - Ntu 1: Cov kav dej hauv av"
• NACE SP0169-2004 "Control of External Corrosion on Underground or Submerged Metallic Piping Systems"

2. Teb chaws (Tuam Tshoj):

• GB / T 21448-2017 "Technical Standard of Cathodic Protection for faus Steel Pipeline"
• GB50369-2014 "Code rau Kev Tsim Kho thiab Kev Txais Cov Roj thiab Roj Pipeline Engineering" ntev

Kev tiv thaiv Cathodic rau kev sib kis cov kav dej yuav tsum muaj kev txiav txim siab zoo:

• Kev xaiv thev naus laus zis: ICCP ua thawj txoj hauv kev, SACP ua pab pawg.
• Txheej kev sib koom ua ke: 3PE / FBE txheej txheej ua lub hauv paus, CP them nyiaj rau txheej txheej tsis xws luag.
• Kev soj ntsuam ntse: Kev tswj xyuas lub neej sib koom ua ke ntawm cov chaw sim ntse, kev tshuaj xyuas phau ntawv, thiab kev soj ntsuam drone.
• Ib puag ncig tshwj xeeb: Customized designs for permafrost/desert area (eg, deep well anodes, solar power).

Los ntawm cov kev ntsuas no, qhov kev pheej hmoo ntawm cov dej xau tau txo qis, ua kom lub sijhawm ntev - muaj kev nyab xeeb thiab ruaj khov kav dej.