Flow-Liner Water, Winch-in-Place-Pipe (WIPP):
Water is a valuable resource as a basis of life, which requires sustainable use and our protection. Flow-Liner guarantees a loss-free and secure conveyance of even the most-sensitive media, such as drinking water, contaminated or polluted liquids. Simultaneously, the composite pipe protects the old pipe from the inside against abrasive particles in the water and against corrosion. The process is based on a flexible high-pressure hose and a connecting technology, which has been developed specifically for this system. The extremely smooth inner coating, ideal flow characters and the optimized systems for high-,medium- and low-pressure requirements all make Flow-Liner an economical choice for the rehabilitation of aging pipelines. Water authorities and network operators benefit from a sustainable and reliable operation and consistent revenue. Flow-Liner Water utilizes Winch-in-Place-Pipe(WIPP) lining for underground water pipes 6”-20” in diameter.
Flow-Liner Water, Spray-in-place-pipe (SIPP):
Spray-in-place pipe lining (SIPP) is an innovative pipe rehabilitation technique where a protective lining is sprayed directly onto the interior surfaces of existing pipes. This process restores the structural integrity of pipes, prevents leaks, and enhances flow capacity, all without the need to dig up and replace old piping systems. This makes it a trenchless pipe rehabilitation service, which is a fast, efficient method that doesn’t disrupt the surrounding area with unsightly digging and dismantling. The SIPP method is ideal for a wide range of applications, including water mains, sewer lines, storm drains, and industrial pipelines. It is even the perfect solution for complicated and delicate vertical piping in high-rise buildings. Our SIPP suitable for pipes 2”-12” in diameter.
Flow-Liner Water WIPP and SIPP are suitable for the transport of the following liquids in the water sector:
potable water
firefighting water
industrial water
sea water
waste water
WIPP Projects
NYC Tunnel No. 3
A Certified Flow-Liner Installer was employed by a general contractor to collaborate with the legendary New York City Sandhogs on one of the most ambitious underground infrastructure projects in U.S. history — Water Tunnel No. 3. This monumental system, part of the city’s vast water supply network, has been under construction for decades and is designed to improve the reliability and redundancy of New York City’s water distribution system. Once fully operational, Tunnel No. 3 will provide a critical backup to the city’s two original tunnels, which date back to the early 1900s and serve over eight million residents daily. The project represents the largest capital construction effort in the city’s history, spanning multiple boroughs and reaching depths of up to 800 feet below the surface. Working in this unique and challenging environment required precision, safety, and coordination at the highest level. The Sandhogs—members of the Laborers’ Local 147, known for their expertise in subterranean construction—have been the backbone of the city’s tunnel and foundation projects for generations. Their work in the pressurized, confined underground spaces of Tunnel No. 3 is both dangerous and highly specialized, demanding teamwork and technical excellence.
The Certified Flow-Liner Installer was tasked with rehabilitating a vertical access pipe several hundred feet deep. Traditional replacement methods were impossible due to the depth and surrounding infrastructure. Instead, the team utilized Flow-Liner’s Winch-In-Place-Pipe (WIPP) lining system, featuring Primus Line® technology—a proven trenchless solution engineered for high-pressure applications and long-distance installations. The WIPP system allowed the team to install a durable, flexible liner through the existing pipe with minimal surface disruption. Using a high-strength aramid reinforced hose-like liner, the system was winched into place and then reconnected to the existing infrastructure. This method provided a seamless, continuous, corrosion-resistant solution that extended the service life of the pipeline while maintaining the integrity of the surrounding tunnel structure.
By incorporating advanced trenchless methods like Flow-Liner’s WIPP system, the project achieved remarkable efficiency—eliminating the need for costly excavation, reducing environmental impact, and minimizing downtime in one of the most complex and restricted urban environments on Earth. The success of this installation underscores the vital role of modern trenchless technology in maintaining New York City’s underground lifelines. Certified Flow-Liner Installers and Primus Line technology continue to demonstrate how innovative rehabilitation techniques can support the work of the Sandhogs and major infrastructure contractors—helping preserve and protect the systems that keep cities like New York running, both above and below ground.