公开(公告)号：US4228399A

公开(公告)日：1980-10-14

申请号：US881737

申请日：1978-02-27

申请人： Frank E. Rizzo ,  Marvin L. Miller ,  Clark Weldon

发明人： Frank E. Rizzo ,  Marvin L. Miller ,  Clark Weldon

IPC分类号： C23F13/04 ,  G01N17/02 ,  G01R19/10 ,  G01R27/14 ,  G01V3/15 ,  G01N27/26 ,  G01R31/00

CPC分类号： G01R19/10 ,  C23F13/04 ,  G01N17/02 ,  G01R27/14 ,  C23F2213/21

摘要： A method and apparatus for conducting offshore pipeline electrical surveys is characterized by initially locating and marking the pipeline, traversing the length of the pipeline towing a reference electrode in close proximity to the structure, providing a supply of wire having one end electrically and mechanically connected to the pipeline at a reference location, playing out the wire along the length of the pipeline through a distance measuring device while transporting the supply of wire and towing the reference electrode, and measuring and recording the potential difference between the reference electrode and pipe either continuously or at spaced test locations along the length of the structure. The method and apparatus are further characterized by alternately connecting and disconnecting an electrical power source to the pipeline at the reference location, measuring and recording the potential difference in both connected and disconnected modes at the test locations, and measuring and recording the depolarization and/or polarization times when the power source is disconnected and/or connected, respectively, to the pipeline.

摘要翻译： 用于进行海上管道电气勘测的方法和装置的特征在于首先定位和标记管道，穿过管道的长度，将参考电极牵引紧靠该结构，从而提供一根电线的供应，其中一端电连接和机械地连接到 在参考位置处的管道，在输送电线并牵引参比电极的同时，通过距离测量装置沿着管道的长度播放电线，并连续测量和记录参考电极与管道之间的电位差，或 在沿结构长度的间隔的测试位置。 该方法和装置的特征还在于，在参考位置交替地连接和断开电源到管道，测量并记录在测试位置处的连接和断开模式中的电位差，以及测量和记录去极化和/或 电源分别断开和/或连接到管道的极化时间。

公开(公告)号：US5728943A

公开(公告)日：1998-03-17

申请号：US620763

申请日：1996-03-15

申请人： Leslie G. Colter, Jr. ,  David C. Katz ,  Frank E. Rizzo

发明人： Leslie G. Colter, Jr. ,  David C. Katz ,  Frank E. Rizzo

IPC分类号： G01N17/00 ,  G01N17/04

CPC分类号： G01N17/043 ,  G01N17/00

摘要： A method and system for detecting and preventing Stress Corrosion Cracking (SCC) in buried pipelines or other structures is presented. The basic principle of the invention is to use a plurality of test coupons which are placed in the same environment as a pipeline or other structure of interest as indicators of the development of SCC in the structure of interest. Loading and temperature of the test coupons are controlled. The test coupons are given a range of different Cathodic Protection (CP) levels, with the range of CP levels selected so as to encompass the CP level at which SCC would be expected to occur. The occurrence of cracking in a test coupon indicates levels of CP which will sustain SCC. SCC is prevented in the structure by application of a level of CP which did not sustain SCC.

摘要翻译： 提出了一种用于检测和预防埋地管道或其他结构中应力腐蚀开裂（SCC）的方法和系统。 本发明的基本原理是使用多个测试试样，其被放置在与管道或其它感兴趣结构相同的环境中，作为感兴趣结构中SCC发展的指标。 试件的装载和温度受到控制。 测试券被给予一系列不同的阴极保护（CP）水平，选择CP水平的范围，以便涵盖预期发生SCC的CP水平。 测试试样中发生裂纹，表明将维持SCC的CP水平。 通过应用不支持SCC的CP级别来防止SCC的结构。