电流法在阀室阴极保护绝缘故障排查中的应用

文中采用电流环、钳型电流表等电流测量设备,精确测量管道或者其他部位的电流大小及方向,结合开挖检查,查找出阀室内绝缘故障的位置。对某输油管道阀室的阴极保护绝缘故障进行检测,发现阀室内电伴热金属丝与管道存在搭接,导致阀室内管道阴极保护欠保护。

Formation and Sintering Behavior of Nanocrystalline Fe-Ni Powder by Mechanical Alloying

The solid sintering behavior and mechanical properties of Fe-Ni powders prepared by mechanical alloying of elemental powders and hot pressing sintering in vacuum atmospheres were investigated. It was observed that the microstructure of the powder particles evolves in three stages. The alloy powder with average grain size of 20-30 nm was obtained. The sinter densification depends crucially on the particle rearrangement and the large amount of internal strain introduced during milling. The theoretical density of over 95 % was obtained after hot pressing sintering at 800 ℃ for 30 min with pressure of 50 MPa. No significant grain growth was observed during sintering. And also relatively high hardness was obtained.

站场柔性阳极断点查找方法研究及应用

文中采用RD8000测量设备,对某输气管道站场区域阴极保护柔性阳极走向及埋深进行测量,找出柔性阳极线缆的断点区域,结合开挖检查,精确找出断点部位。断点处柔性阳极腐蚀严重,可能是施工导致柔性阳极破损,长期腐蚀导致断缆。建议对该段柔性阳极进行更换,或者与站内其他柔性阳极形成回路,降低恒电位仪整体回路电阻,提高区域阴极保护输出水平。