公开(公告)号：US6160403A

公开(公告)日：2000-12-12

申请号：US81804

申请日：1998-05-20

申请人： Fumio Kajiyama

发明人： Fumio Kajiyama

IPC分类号： C23F13/00 ,  G01N17/02 ,  G01N27/26 ,  G01N27/42

CPC分类号： G01N17/02

摘要： A method and a device to assess the adequacy of a cathodically protected underground pipeline with consideration of AC corrosion. A steel probe and a CSE are installed near the pipeline at a depth. The steel probe is electrically connected to a pipeline. The measurements of AC probe currents flowing between a steel probe (2) and the pipeline (1) are per-formed simultaneously with those of on-and off-potentials, and DC probe currents.

摘要翻译： 考虑到AC腐蚀，评估阴极保护地下管道的充分性的方法和装置。 钢管探头和CSE安装在管道附近的深处。 钢探头电连接到管道。 在钢探头（2）和管道（1）之间流动的交流探头电流的测量与导通和关断电位以及直流探针电流同时进行。

公开(公告)号：US09568412B2

公开(公告)日：2017-02-14

申请号：US14240944

申请日：2012-06-04

申请人： Fumio Kajiyama

发明人： Fumio Kajiyama

IPC分类号： G01N17/02 ,  G01N17/04

CPC分类号： G01N17/043 ,  G01N17/02

摘要： A measuring and assessing method for the AC corrosion risk of a pipeline wherein the coupon is connected to a metallic pipeline buried in the earth and the AC corrosion risk of the pipeline is assessed on the basis of coupon DC current density and coupon AC current density that are acquired from a measured value of a coupon current, wherein the measuring and assessing method includes: a step of specifying frequency to specify a source of AC corrosion from a waveform of the measured value of the coupon current; and a step of calculating a coupon current density whereby a pair of coupon DC current density and coupon AC current density is acquired from the measured value of the coupon current in one time unit by defining one cycle of a specified frequency as one time unit.

摘要翻译： 基于优惠券直流电流密度和优惠券交流电流密度来评估管道的交流腐蚀风险的测量和评估方法，其中优惠券连接到埋在地球中的金属管道和管道的交流腐蚀风险 从所述优惠券电流的测量值获取，其中所述测量和评估方法包括：从所述优惠券电流的测量值的波形中指定频率以指定AC腐蚀源的步骤; 以及计算优惠券电流密度的步骤，通过将特定频率的一个周期定义为一个时间单位，从一个时间单位中的优惠券电流的测量值获取一对优惠券直流电流密度和优惠券AC电流密度。

公开(公告)号：US20140225631A1

公开(公告)日：2014-08-14

申请号：US14240944

申请日：2012-06-04

申请人： Fumio Kajiyama

发明人： Fumio Kajiyama

IPC分类号： G01N17/04

CPC分类号： G01N17/043 ,  G01N17/02

摘要： A measuring and assessing method for the AC corrosion risk of a pipeline wherein the coupon is connected to a metallic pipeline buried in the earth and the AC corrosion risk of the pipeline is assessed on the basis of coupon DC current density and coupon AC current density that are acquired from a measured value of a coupon current, wherein the measuring and assessing method includes: a step of specifying frequency to specify a source of AC corrosion from a waveform of the measured value of the coupon current; and a step of calculating a coupon current density whereby a pair of coupon DC current density and coupon AC current density is acquired from the measured value of the coupon current in one time unit by defining one cycle of a specified frequency as one time unit.

摘要翻译： 基于优惠券直流电流密度和优惠券交流电流密度来评估管道的交流腐蚀风险的测量和评估方法，其中优惠券连接到埋在地球中的金属管道和管道的交流腐蚀风险 从所述优惠券电流的测量值获取，其中所述测量和评估方法包括：从所述优惠券电流的测量值的波形中指定频率以指定AC腐蚀源的步骤; 以及计算优惠券电流密度的步骤，通过将特定频率的一个周期定义为一个时间单位，从一个时间单位中的优惠券电流的测量值获取一对优惠券直流电流密度和优惠券AC电流密度。