lessons learnt on pipe failure mechanisms from observation of exhumed cast iron pipes
The main reasons for the failure of cast iron pipes are external load, internal load and corrosion.
Replace the pipes after the failure as quickly as possible, and only briefly record the failure mechanism.
The degree of corrosion of the excavated cast iron pipe was sorted out.
Pipeline failure that did not cause a major burst (
No leakage and failure of pipes)were examined.
Some examples of non-
The failure cast iron pipe section was analyzed using stress analysis and approximate pipe material input data.
In conclusion, regardless of the depth of corrosion, the patch/pit size of the inspected diameter below 40mm is unlikely to cause failure of all the cast iron pipes tested.