PVC U-Bend Pipe Repair for Leak Joints Under Pressure
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Solution Overview
Problem
Conventional methods for repairing PVC water piping introduce weak junctures and require extensive digging or are prone to failure under pressure, as they rely on threads, O-rings, or materials that deteriorate over time.
Innovation Solution
A PVC U-bend with glued-on elbow joints is used for repair, eliminating threads and O-rings, and allowing for one-handed installation without the need for constant pressure, maintaining the strength of the original piping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional repair fittings (slip fix, compression coupling, union, flexible coupling) are used to repair short sections of pipe, then the repair gap can be bridged, but weak junctures are introduced that are prone to failure under pressure and deterioration over time
Solution Approach 1:
The repair fitting is constructed entirely from homogeneous PVC material matching the original pipe, eliminating material incompatibility. The U-bend design with glued elbow joints creates a uniform PVC structure that maintains consistent material properties throughout the repair section, avoiding the mixed-material weak points inherent in fittings that combine metal threads, rubber O-rings, and plastic components.
Solution Approach 2:
The invention extracts and eliminates the problematic components from conventional fittings—specifically removing threads, O-rings, and multi-material assemblies. By taking out these weak elements and replacing them with a simplified all-PVC glued joint structure, the repair fitting achieves reliability comparable to the original pipe while maintaining ease of installation.
2Ease of manufacture
If replacement pipe with straight fittings is used to repair broken pipe, then the broken section can be replaced, but the fitting creates extra length requiring serious angling and stress on the system
Solution Approach 1:
The U-bend configuration uses a curved geometry that naturally accommodates the spatial requirements of the repair without requiring angular manipulation of rigid fittings. The curved U-shape allows the replacement section to fit into the repair gap while maintaining alignment with the existing pipe, eliminating the need for serious angling that would stress the system.
3Reliability
If the entire length of pipe containing the rupture is replaced, then a durable repair is achieved, but extensive digging is required to access fittings at both ends
Solution Approach 1:
The invention segments the repair task by designing a compact U-bend fitting that can be installed in a localized area. This segmentation allows the repair to be confined to a small section of pipe around the rupture, eliminating the need to replace entire 20-foot segments and access distant fittings, thereby reducing digging time while maintaining repair durability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides a durable, inexpensive, and efficient repair that maintains full pressure integrity without introducing weak points, allowing for quick and easy underground pipe repairs without replacing entire sections.
Implementation Method 1
heating PVC piping to approximately 300° F.
Implementation Method 2
bending the mandrel in order to bend the pipe without kinking
Data Source
AI summary
A device for repairing pipe leakage takes the form of a short section of PVC pipe with fittings. The pipe is ideally a 1′-2′ section fashioned into a U-bend with a substantially semi-circular bend and two arms, and the fittings take the form of an elbow joint glued onto each arm. The arms are ideally offset up to 5° from parallel. A method of repairing cracked PVC piping using the device involves cutting out a 4″-6″ section of piping, gluing the exposed ends of the broken piping as well as the elbow joints, squeezing the U-bend, positioning the squeezed device into the gap in broken piping, and releasing the U-bend to fit the elbow joints over the exposed ends of broken piping. The device has no vulnerable moving parts or O-rings, and it obviates the need to remove entire pipes.