Case Histories

Public Sector

Severe Graphitic Corrosion in Cast Iron Drain Lines in 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 both finished walls, and in the crawl space.

Material: Cast iron drain lines are to conform to ASTM A888, the analyzed pipe did not conform to these specifications.

Manufacturer: Titan

Installation Date: approx. 1983

Service Life: approx. 23 years

Mode of Failure: Severe graphitic corrosion, and cracking due to the use of a cast iron material which did not meet specifications for this use.

Findings: The drain line system contained multiple longitudinal and transverse cracks in the cast iron piping. In addition, sever graphitic corrosion had reduced the wall thickness of piping in some locations to 1/16-inch or less, creating holes and leak sites, in some locations, appearing as ‘carbunkle’ leak sites.