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The case history will discuss HDD methodology and challenges. With all the benefits of HDD comes the disadvantages especially from pipeline maintenance, corrosion control and integrity management. HDD can impose additional strain on the pipeline during the pull through process and can increase both installation stress and operational stress. HDD installed pipeline crossings are deep and could easily become low points for liquid hold up causing flow issues.
Pipeline installation by Horizontal Directional Drilling (HDD) i.e., trenchless technology, has gained popularity over the last four (4) decades. Sound engineering practices, site conditions, and safety considerations dictate the use of HDD methodology for installing a pipeline segment. HDD is often recommended by regulatory agencies and governmental agencies to avoid contamination, disturbance, and flow interruption of water bodies and especially in environmentally sensitive areas (ESAs). This pipe replacement is an update of the field work, design, pull through installation, type of coatings, inspection, repair, and cathodic protection (CP) testing.
Two drilling mud samples, taken at different HDD operations. Results demonstrated the presence of microorganism populations associated with microbiologically influenced corrosion (MIC) at one of the two test locations.
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Laboratory and field experiment results show that the soil resistivity is the main influencing factor of the cathodic protection current distribution of horizontal directional drilling. This article also gives a test method for effectiveness of cathodic protection of HDD.
Galvanic anodes have been used to provide various levels of corrosion protection to reinforced concrete structures for many years.