Confined Space Entry Work

Up for a Challenge Down Below

For CWW there’s never a sewer too large for cleaning, inspection or rehabilitation. The members of our specialized confined-space entry team will, according to our strict safety policies, venture into large-diameter sewer pipes that demand the implementation of effective and sustainable solutions.

Where required, we can divert the flow from large sewers to ensure a higher degree of safety and a more complete treatment. A closed-circuit television (CCTV) camera affixed to a large crawler – or held by a CWW operator – is used for inspection. A second CWW team member cleans the pipe by advancing on foot. Should video inspection reveal structural defects, CWW will proceed with the rehabilitation process of the respective sewers and outfalls. For sealing leaks and cracks, specialized grouting equipment is assembled directly inside the pipe.

A second operator utilizing the combination cleaning unit advances a high pressure cleaning nozzle rated for the pipe diameter while the CCTV unit monitors the cleaning operations.

CWW is also equipped to handle large diameter “over-the-hole wet-out” installations. The installation process consists of impregnating large size liners on site and over the manhole as it is being installed in the sewer.

CWW has a long history of deploying an extensive list of specialized equipment to clean and televise sewer outfalls, including an imposing flushing and pumping unit. In a case where the outfall of a storm sewer is submerged in a body of water, CWW deploys environmentally responsible measures of flushing debris and de-watering the pipe for inspection. We employ professional divers to complete large sewer outfall projects safely and effectively. CWW’s de-watering and on-site treatment removes the debris from the water that is being pumped from the sewer. The clean water is then re-introduced into the pipe, and the debris transported off-site for disposal.