Case Histories » Public Sector

Severe Graphitic Corrosion in Cast Iron Drain Lines of a Health Care Facility

Cracked and Perforated Elbow of Failed Cast Iron Drain Pipe
Corrosion and Cracking of a Titan 3 1/8 inch Drain Line Elbow This elbow was likely in a horizontal position as this portion of the pipe wall had thinned to 1/16 inch or less.

Environment

Vertical and horizontal waste water drain line located in a health care facility. Pipes were located in finished walls and the crawl space.

Material

Cast iron drain lines should conform to ASTM A888, but the analyzed pipe did not comply with these specifications.

Manufacturer

Titan.

Installation Date

Approximately 1983.

Service Life

Approximately 23 years.

Mode of Failure

Severe graphitic corrosion and cracking due to the use of a cast iron material which did not meet specifications.

Findings

The drain line system contained multiple longitudinal and transverse cracks in the cast iron piping. Severe graphitic corrosion had also reduced the wall thickness of the piping in some locations to 1/16-inch or less, creating holes and leak sites, which in some locations, appeared as tubercle leak sites.