EVALUATION OF ENVIRONMENTALLY ASSISTED CRACKING OF ARMOUR WIRES IN FLEXIBLE PIPES, POWER CABLES AND UMBILICALS
(0) Environmentally assisted cracking(EAC)of armour wires in flexible pipes,power cables and umbilicals is a major concern with the development of oil and gas fields and wind farms in harsh environments.Hydrogen induced cracking(HIC)or hydrogen embrittlement(HE)of steel armour wires used in deep-water and ultra-deep-water has been evaluated.Simulated tests have been carried out in simulated sea water,under conditions where the susceptibility is the highest,i.e.at room temperature,at the maximum negative cathodic potential and at the maximum stress level expected in service for 150 hours.Examinations of the tested specimens have not revealed cracking or blistering,and measurement of hydrogen content has confirmed hydrogen charging.In addition,sulphide stress cracking(SSC)and chloride stress cracking(CSC)of nickel-based alloy armour wires used in harsh down-hole environments has been evaluated.Simulated tests have been carried out in simulated solution containing high concentration of chloride,with high hydrogen sulphide partial pressure,at high stress level and at 120℃ for 720 hours.Examinations of the tested specimens have not revealed cracking or blistering.Subsequent tensile tests of the tested specimens at ambient pressure and temperature have revealed properties similar to the as-received specimens.
environmentally assisted cracking(EAC) Hydrogen induced cracking(HIC) hydrogen embrittlement(HE) sulphide stress cracking(SSC) chloride stress cracking(CSC) stress corrosion cracking(SCC) steel nickel based alloy corrosion
Zhiying Zhang
Wuhan University of Technology 122 LuoShi Road HongShan District Wuhan,HuBei,430070,China
国际会议
Energy Materials 2014(第一届能源材料国际会议)
西安
英文
775-780
2014-11-04（万方平台首次上网日期，不代表论文的发表时间）