Pinholing and cracks in cast iron stacks

Plumbing · Traps · printed page 288 (PDF page 289)

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Drains – Plumbing – Pinholing and Cracks in Cast Iron Stacks Pinholing and Cracks in Cast Iron Stacks Plumbing

Text in the illustration

manufacturing defects may cause pinholes pinholes can also be caused by pitting and corrosion inside the pipe cracks often start at the crown of the pipe some older cast iron pipes have variable wall thickness, leaving thin areas to more susceptible to damage
manufacturing defects may cause pinholes
pinholes can also be caused by pitting and corrosion inside the pipe
cracks often start at the crown of the pipe
some older cast iron pipes have variable wall thickness, leaving thin areas to more susceptible to damage

Generated explanation

The illustration shows a cutaway of a cast iron drain stack with pinholes, longitudinal cracks, and uneven pipe wall thickness. One pinhole is identified as a possible manufacturing defect, while another occurs at an area of internal pitting and corrosion. A callout notes that cracks often start at the crown of the pipe. The variable wall thickness of some older cast iron pipes leaves thin areas more susceptible to damage.