公开(公告)号：US06218840B1

公开(公告)日：2001-04-17

申请号：US09307408

申请日：1999-05-08

申请人： John Fridy Warren

发明人： John Fridy Warren

IPC分类号： G01V308

CPC分类号： H02G9/02 ,  C23F13/06 ,  C23F2213/32 ,  H02G9/00

摘要： The present invention is a means of allowing continuous radio detection of underground utilities while maintaining cathodic insulation of metal utility conduits such as gas mains and pipes. By using a capacitor between a metal gas main and an old metal gas service line, the gas main is isolated from the service line. A short in the tracer line against the old metal gas service line will not result in an electrical connection with the metal gas line that increases the rate of deterioration of the cathodic protection anode. Using the capacitor in the tracer wire system eliminates check points isolating tracer wire sections. In the preferred embodiment of the present invention, the capacitor assembly comprises a ceramic nonpolar capacitor ranging from 0.01 microfarad to 1.0 microfarad encased in an epoxy plastic contained in a case. The tracer wire leads are of 14 gauge oxygen free copper.

摘要翻译： 本发明是一种允许连续地对地下设施进行无线电检测的手段，同时保持诸如燃气主管和管道的金属公用管道的阴极绝缘。 通过在金属气体主体和旧的金属气体服务管线之间使用电容器，气体主体与服务管线隔离。 与旧金属燃气服务线相比，示踪线短路不会导致与金属气体管线的电连接，从而增加阴极保护阳极的劣化速率。 在示踪线系统中使用电容器可以消除检查点隔离示踪线段。 在本发明的优选实施例中，电容器组件包括一个陶瓷非极性电容器，其范围从包含在壳体中的环氧树脂中的0.01微法到1.0微法。 示踪线导线为14号无氧铜。