Adjustable Inert Gas Generator for Fire Protection Systems

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Solution Overview

Problem

Existing fire protection systems face challenges in efficiently generating and maintaining inert gases for dry pipe and preaction systems, particularly in cold environments, due to high costs and ice buildup issues.

Innovation Solution

An adjustable inert gas generation assembly that allows for the selective production of inert gas at varying purity levels, enabling switching between different modes (fill, inert, and maintenance) to optimize gas production and prevent ice accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If an inert gas generator is operated in inert gas generation mode to produce high purity nitrogen gas, then the purity of the supervisory gas is improved, but the size and cost of the generator becomes prohibitively large to satisfy the 30-minute pressurization requirement

Engineering Contradiction:

Improvepurity of supervisory gasVSAvoidsize of inert gas generator

Core Design Contradiction:

Manufacturing precisionVSVolume of stationary object

Solution Approach 1:

The system dynamically switches between two operational modes: bypass mode for rapid pressurization using ambient air, and inert gas generation mode for maintaining high purity nitrogen. This dynamic operation allows the generator to be sized for maintenance rather than initial fill, reducing overall system size and cost while achieving both pressurization speed and gas purity requirements

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system employs periodic operation where the inert gas generator alternates between bypass mode and nitrogen generation mode. The control system monitors system pressure and automatically switches modes, using ambient air for initial pressurization and then transitioning to high purity nitrogen generation, thereby avoiding the need for an oversized continuous high-purity generator

Inventive Principle:

Principle #19Periodic action

2Speed

If ambient air is used to pressurize the pipe network, then the initial pressurization speed is improved, but ice buildup occurs in cold environments due to moisture condensation

Engineering Contradiction:

Improvepressurization speedVSAvoidice buildup in pipe network

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary pressurization using ambient air to quickly bring the system to operating pressure within the 30-minute requirement, then immediately transitions to inert gas generation mode to replace the moisture-laden air with high purity nitrogen, preventing ice buildup before it can occur

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system rushes through the initial pressurization phase using ambient air to meet the 30-minute deadline, then quickly transitions to nitrogen generation mode to eliminate moisture concerns. This two-phase approach allows the system to skip the prolonged exposure to moisture that would cause ice buildup

Inventive Principle:

Principle #21Skipping (Rushing through)

3Loss of time

If the inert gas generator is sized to satisfy the 30-minute pressurization requirement in inert gas mode, then the pressurization time requirement is met, but the purchase, installation, and operating costs become prohibitively high

Engineering Contradiction:

Improvetime to pressurize systemVSAvoidoperating cost of inert gas generator

Core Design Contradiction:

Loss of timeVSLoss of energy

Solution Approach 1:

The system dynamically adjusts its operation to use ambient air for the high-power initial pressurization phase, then switches to the lower-power inert gas generation mode for maintenance. This dynamic operation dramatically reduces energy consumption and operating costs compared to continuous high-purity nitrogen generation, while still meeting the 30-minute pressurization requirement

Inventive Principle:

Principle #15Dynamics

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 solution enables efficient and cost-effective inert gas generation, effectively preventing ice buildup and maintaining system integrity, while optimizing gas production to meet specific pressure requirements.

Implementation Method 1

an inert gas generator...configured for selectively producing a flow of inert gas to the pipe network at least at a first purity level and a second purity level

Methodology Applied

Scientific EffectGas separation:

Data Source

PatentUS20250041644A1Adjustable inert gas generation assembly for water-based fire protection systems

Publication Date: 2025.02.06 ENGINEERED CORROSION SOLUTIONS LLC

AI summary

An adjustable inert gas generation assembly for producing a flow of inert gas for introduction into a pipe network of a fire protection system includes an inert gas generator with an outlet in fluid communication with the pipe network and configured for selectively producing a flow of inert gas to the pipe network at least at a first purity level and a second purity level, wherein the first purity level is produced while the assembly is in a first mode and the second purity level is produced while the assembly is in a second mode; wherein the second purity level is higher than the first purity level; and a control circuit in electrical communication with the inert gas generator and configured to selectively switch the inert gas generator between the first and second modes.