Air Valve Vent Pipe Layout for Flood-Safe Pipeline Venting
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Solution Overview
Problem
Existing inflow protection devices for pipelines are complex, expensive, and difficult to install and maintain, and they fail to meet EPA, USC, or ASSC specifications for cross-connection protection, allowing water to contaminate pipelines during flooding.
Innovation Solution
An inflow protection device comprising an adaptor, flexible hose, and elongated vent pipe that connects to an air valve, allowing air to be exhausted and admitted without allowing water to enter, even when the vault is flooded, using quick connect fittings and a vent pipe positioned above the flood plain to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air valves are installed below grade in concrete vaults to protect from freezing, then the valves are protected from freezing, but water can accumulate in the vaults during heavy rain and flooding and enter the pipelines through the air valves, thus contaminating the potable water
Solution Approach 1:
The system separates the air valve housing from the venting function by routing air exhaust through an above-ground vent pipe, while the air valve itself remains protected in the below-grade vault. This segmentation allows the valve to benefit from freezing protection while the venting path avoids flood water contamination.
Solution Approach 2:
The vent pipe acts as an intermediary element that connects the below-grade air valve to above-ground air intake. It provides a protected pathway for air exchange that prevents direct contact between flood water and the air valve inlet, thereby preventing contamination while maintaining the freezing protection benefit.
2Reliability
If known inflow protection devices incorporate multiple float valves, check valves, etc., then inflow protection is provided, but the devices become complicated, expensive, and difficult to install and maintain
Solution Approach 1:
The invention extracts the essential protective function from complex valve assemblies and implements it through a simple architectural configuration: a below-grade air valve connected to an above-ground vent pipe. This eliminates the need for multiple float valves, check valves, and other complex components while maintaining inflow protection.
Solution Approach 2:
The system uses the natural environment (above-ground air space) to provide protection against flood water intrusion. The elevated vent pipe inlet naturally prevents water entry during flooding without requiring active control mechanisms, float valves, or check valves, thereby simplifying the device while maintaining reliability.
3Reliability
If known inflow protection devices are installed, then inflow protection is provided, but they are not testable or certifiable and therefore do not meet EPA, USC, or ASSC specifications for cross connection protection
Solution Approach 1:
The invention replicates the protective function of complex certified devices through a simpler, geometrically-defined configuration. The elevated vent pipe inlet at a specified height above the flood plain creates a passive barrier that can be easily measured, inspected, and certified according to regulatory standards, unlike complex mechanical assemblies.
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
Prevents water and contaminants from entering the pipeline while allowing air to be exchanged, simplifying installation and maintenance, and meeting regulatory standards for cross-connection protection.
Implementation Method 1
The vent pipe is of a length sufficient to position its upper end above a flood plain level so that it allows air to be exhausted from and admitted into the air valve even when the vault becomes flooded.
Data Source
AI summary
An inflow protection device for preventing liquids and other contaminants from entering a water-carrying pipeline through an air valve connected to the pipeline. The inflow protection device includes an adaptor and an elongated vent pipe. The adaptor has a first end for coupling with an outlet of the air valve and second end. The vent pipe has a first end configured for directly or indirectly coupling with the second end of the adaptor and a second end extending out of and above a vault in which the air valve is installed. The vent pipe is of a length sufficient to position its second end above a flood plain level so that the second end allows air to be exhausted from and admitted into the air valve even when the vault in which the air valve is located becomes flooded.