Open AccessREALTIME MONITORING OF PIPELINES FOR THIRD-PARTY CONTACT
Author(s) -
G. L. Burkhardt,
Alfred E Crouch
Publication year - 2004
Language(s) - English
Resource type - Reports
DOI - 10.2172/835012
Subject(s) - pipeline transport , cathodic protection , signal (programming language) , pipeline (software) , marine engineering , coating , current (fluid) , engineering , structural engineering , forensic engineering , mechanical engineering , computer science , electrical engineering , materials science , chemistry , electrode , composite material , electrochemistry , programming language
Third-party contact with pipelines (typically caused by contact with a digging or drilling device) can result in mechanical damage to the pipe, in addition to coating damage that can initiate corrosion. Because this type of damage often goes unreported and can lead to eventual catastrophic failure of the pipe, a reliable, cost-effective method is needed for monitoring and reporting third-party contact events. The impressed alternating cycle current (IACC) pipeline monitoring method consists of impressing electrical signals on the pipe by generating a time-varying voltage between the pipe and the soil at periodic locations where pipeline access is available. The signal voltage between the pipe and ground is monitored continuously at receiving stations located some distance away. Third-party contact to the pipe that breaks through the coating changes the signal received at the receiving stations. In this project, the IACC monitoring method is being developed, tested, and demonstrated. Work performed to date includes (1) a technology assessment, (2) development of an IACC model to predict performance and assist with selection of signal operating parameters, (3) Investigation of potential interactions with cathodic protection systems, and (4) experimental measurements on buried pipe at a test site as well as on an operating pipeline. Initial results show that simulated contact can be detected. Future work will involve further refinement of the method and testing on operating pipelines