This paper discusses the use of UV Cured-In-Place-Pipe (CIPP) as part of a long-term sewer rehabilitation programme in Singapore. Over the past 30 years, Public Utilities Board (PUB), Singapore’s National Water Agency, has rehabilitated over 2,200 km of public sewers as part of its asset renewal initiative, which aims to extend the useful life of aging infrastructure. The programme, initiated in mid-1990s, utilises trenchless technologies such as CIPP, Fold and Form (F&F), and Spiral Wound Lining (SWL) to rehabilitate pipes with diameters ranging from 100mm to 2,100mm. Recent advancements include the adoption of UV CIPP, which provides several advantages such as improved quality control, enhanced structural strength, and integration of advanced monitoring technologies. This method is particularly suited for rehabilitating smaller diameter sewers (up to 600mm) and deeper pipes. This paper highlights the benefits and challenges encountered during the installation of UV CIPP, focusing on projects involving pipes ranging from 225mm to 600mm. The findings underscore UV CIPP as a cost-effective, sustainable, and efficient solution for maintaining the integrity and flow capacity of Singapore’s used water network.

KEYWORDS

Sewer maintenance, sewer rehabilitation, trenchless methods, trenchless technology, No-dig technology, UV liner trenchless Techniques