Nu Flow has received a patent for its Cured in Place Pipe (CIPP) Flex Liner, designed to line around multiple 90-degree bends.
San Diego-based Nu Flow, a global provider of inside-infrastructure products and services, filed the patent application in May 2005.
The newly issued U.S. Patent No. 7,849,883—“Liner Assembly for Pipeline Repair and Methods of Installing Same”—covers Nu Flow’s Flex Liner, which the company calls an improvement “that extends the market well beyond traditional CIPP straight-pipe applications.”
Pipe Repair around Bends
Nu Flow’s Flex Liner can be used to rehabilitate failing pipe systems without digging or destruction, the manufacturer says. The process creates a structurally sound pipe within the existing pipe, spanning voids with a seamless liner that prevents root intrusion and leaks, the company says.
“Our products are designed to satisfy the growing demand for cost-effective, non-invasive, pipe rehabilitation solutions,” says Nu Flow CEO Cameron Manners. “This patent allows Nu Flow to continue providing innovative products to our customers and licensees by supplying a complete no-dig solution that structurally repairs pipes around 90-degree bends.”
Pipe systems inside and below buildings typically have significantly more elbows and junctions than other pipe systems. Flex Liner has an internal rubber assembly that gives the liner greater flexibility, allowing installation in pipes with 22-, 45- and 90-degree bends without wrinkling inside the liner, the company says.
Cured-in-place materials mold to the host pipe and increase flow capacity by providing a smoother pipe, Nu Flow says. Resin formulas are customized to the customer’s requirements.
“Structural strength enhances structural strength of host pipe and acts as a stand-alone pipe meeting or exceeding test results using ASTM D790 as our benchmark,” the company says.
“Millions of linear feet of cured-in place materials have been installed worldwide,” the company says. “They have withstood every corrosive environment plus the test of time. Billions of dollars have been saved because excavation was eliminated.”
The patent also covers Nu Flow’s pull-in-place method of installing the liner as well as a liner assembly for installing a liner at a junction between a main pipe and a lateral pipe. The Nu Flow lining process is suitable for pipes ranging from 1 1/2 to 8 inches in diameter, but smaller or larger diameters are also available.
The Flex Liner assembly is constructed to prevent over-expansion during positioning and inflation of the liner within a pipeline, according to Nu Flow.
Nu Flow provides trenchless technologies that rehabilitate inside infrastructure drinking water pipes, sewer drain and sanitary lines, lead service piping, mechanical systems such as HVAC, chiller and heating lines, fire suppression systems, compressed air systems, process pipes and pool lines.
More information: www.nuflowtech.com.