Automatic Fire Hydrant Water Supply System with Air Bleeding
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Solution Overview
Problem
Manual operation of hydrant valves and air bleed valves in fire trucks can lead to errors, such as forgetting to open the air bleed valve, resulting in pressure issues and flow problems during firefighting operations.
Innovation Solution
An automatic fire hydrant water supplying system with a remotely controllable hydrant discharge valve and air bleed valve integrated with the fire truck's pump control system, using a pressure sensor to differentiate between air and water and automatically venting air from the hose before opening the master intake valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual operation of hydrant valves and air bleed valves is used, then operator control flexibility is maintained, but human error occurs leading to pressure issues and flow problems
Solution Approach 1:
The system performs automatic hydrant flushing and air bleeding without operator intervention. The control system automatically activates the hydrant flush valve to clear debris, then opens the air bleed valve to remove trapped air from the hose, and finally opens the hydrant discharge valve to supply water to the pump tank, eliminating human error while maintaining operational control
Solution Approach 2:
The manual mechanical valve operation is replaced with an automated control system that uses sensors and control logic to operate the hydrant flush valve, air bleed valve, and hydrant discharge valve. This substitution eliminates human error in valve operation while maintaining the mechanical hydraulic functions
2Reliability
If automatic control system is implemented, then operator error is eliminated, but system complexity increases
Solution Approach 1:
The control system uses pressure sensors to detect water flow from the hydrant and automatically controls the sequence of valve operations. The feedback from pressure detection enables the system to know when flushing is complete and when to proceed to air bleeding and water supply, providing automatic control without excessive complexity
Solution Approach 2:
The system uses pressure as a key parameter to control the automation sequence. By monitoring pressure changes in the hose, the control system determines when to transition between operations (flushing, air bleeding, water supply), using a simple parameter-based control logic that avoids complex control algorithms
3Object-affected harmful factors
If air is not bled from the hose, then system simplicity is maintained, but water hammer and cavitation damage occurs
Solution Approach 1:
The system automatically performs air bleeding as a preliminary action before opening the hydrant discharge valve to supply water to the pump. The control system activates the air bleed valve after detecting water flow from the hydrant but before opening the main discharge valve, removing trapped air in advance to prevent water hammer and cavitation, eliminating the need for manual air bleeding operations
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
Ensures debris-free water supply and prevents pressure spikes by automatically flushing the hydrant and bleeding air, reducing operator intervention and improving firefighting efficiency.
Implementation Method 1
a pressure sensor in fluid communication with the water-supply fire hose upstream of the master-intake-valve input port and operatively coupled to the fire-truck water-pump control system
Implementation Method 2
automatically venting air from the hose before opening the master intake valve
Data Source
AI summary
An automatic fire hydrant water supplying system provides hydrant supply water to a fire truck having a water pump; a water pump master intake valve; a water-supply fire hose, a pressure sensor upstream of the master-intake-valve, and a water-pump control system. The automatic fire hydrant water supplying system has a remotely-controllable hydrant discharge valve connectable to the hydrant and to the fire-hose. A remotely-controllable air bleed valve is in fluid communication with the master-intake-valve and the fire-hose. The water-pump control system determines whether a pressurized volume in the fire hose upstream of the master-intake-valve input port is air or water based on a difference in density between air and water as sensed by the pressure sensor and if the pressurized volume is air causes the air to be vented to atmosphere through the air-bleed-valve before opening the master-intake-valve to provide hydrant supply water to the water pump.