PUB fixes sewer 'wounds' with PVC strips
When a sewer so large that a man can walk inside develops a leak, it takes more than just a simple plug.
Instead, the PUB relies on a technique using strips of PVC that are interlocked in a spiral pattern to form a pipe.
On Thursday, the national water agency conducted a show-and-tell in Kallang on how it has been fixing large sewers with the method called spiral wound lining since 2007.
PUB said this technique is ideal for sewers larger than 60cm in diameter since it can be used even when there is water inside. Other methods require the water in the sewer to be diverted.