The U.S. Department of Transportation now requires all new pipelines to be 100 percent cathodically protected. However, the use of casing pipe around carrier pipe obstructs the successful application of cathodic protection. Although once necessary because of materials and methods of construction, casing can now be eliminated because of better materials and manufacturing methods, welding procedures, and quality control and inspection methods. In 1971, 3 state highway departments allowed uncased pipes to be used at highway crossings. The following features were incorporated in this new design: Nominal pipe wall thickness increased by a minimum of 20 percent, heavier wall pipe extended 40 to 80 ft on either side of the highway right-of-way, complete X-ray examination of girth welds within right-of-way, pipe coated and wrapped to provide adequate protection and electrical insulation, 1-in. thick reinforced concrete jacket installed on the pipe to be pulled, cathodic protection of pipeline at all times, 3-ft minimum cover provided between pipe and ground surface within right-of-way, and hydrostatic pressure test at 125 percent of maximum operating pressure level for a 24-hour period.

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 15-23
  • Monograph Title: Accommodating utilities in transportation rights-of-way
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00056887
  • Record Type: Publication
  • ISBN: 030902269X
  • Report/Paper Numbers: #483
  • Files: TRIS, TRB
  • Created Date: Aug 16 1974 12:00AM