Fire Hose Testing Apparatus with Segmented Branch Conduits
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Solution Overview
Problem
Current fire hose testing methods lack efficiency in testing at both low and service pressures, do not allow for simultaneous testing of multiple hoses at different pressures, and fail to isolate hoses in case of leaks or bursts, making them inefficient and unsafe.
Innovation Solution
A fire hose testing apparatus that performs two tests: a low-pressure test at 45 psig ±5 psi to check for leaks and coupling slippage, and a service pressure test where hoses are pressurized to at least 1.05 times their service test pressure for three minutes, using a variable frequency-variable speed drive and isolation valves to control pressure and isolate hoses if leaks occur, allowing for simultaneous testing of multiple hoses at different pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single testing apparatus is used for both low pressure and service pressure tests, then device complexity is reduced, but it becomes impossible to test multiple hoses at different pressures simultaneously
Solution Approach 1:
The testing apparatus is divided into multiple independent branch test conduits (first branch test conduit, second branch test conduit, etc.), each capable of testing a hose at a different pressure level simultaneously. Each branch has its own isolation valve, pressure transducer, and testing capabilities, allowing parallel testing at low pressure and service pressure without interfering with each other.
Solution Approach 2:
The apparatus is designed with universal components that can serve multiple functions. The pump system can supply pressure to multiple branches simultaneously, the controller can manage multiple isolation valves and pressure transducers, and the overall system can perform both low pressure tests and service pressure tests using the same basic infrastructure, just distributed across different branches.
2Reliability
If isolation valves are installed in each branch test conduit, then hoses can be isolated in case of leaks or bursts, but device complexity increases
Solution Approach 1:
Each branch test conduit is equipped with its own isolation valve (first isolation valve, second isolation valve, etc.), creating segmented isolation zones. This allows individual hoses to be isolated from the pressure system independently, so that a leak or burst in one hose does not affect other hoses being tested or the overall system operation.
Solution Approach 2:
The isolation valves act as intermediary components between the pressure supply system and the hoses being tested. They provide a controlled interface that can open or close to isolate specific branches, serving as a safety mediator that prevents uncontrolled pressure release while maintaining system integrity.
3Productivity
If multiple branch test conduits are used to test hoses at different pressures, then testing efficiency increases, but device complexity increases
Solution Approach 1:
The system uses multiple branch test conduits (first branch test conduit, second branch test conduit, third branch test conduit, etc.) that are segmented from the main pressure header. Each branch can independently test a hose at its required pressure level, allowing simultaneous testing of multiple hoses and significantly improving productivity compared to sequential single-hose testing.
Solution Approach 2:
Multiple branch test conduits are merged into a single integrated testing apparatus with a common pump system, pressure header, and controller. This combines the functionality of multiple separate testing stations into one unified system, achieving high productivity while consolidating control and reducing the need for multiple independent apparatuses.
4Measurement precision
If pressure is increased to service test pressure levels, then accurate service pressure testing is achieved, but safety risks increase in case of hose failure
Solution Approach 1:
The system segments the high-pressure testing into isolated branch conduits, each with its own isolation valve. When testing at service pressure levels (which may exceed 100 psi), the isolation valves ensure that if a hose bursts, the failure is contained to that specific branch and does not compromise the entire system or pose uncontrolled safety hazards.
Solution Approach 2:
The isolation valves are positioned upstream of the hoses being tested, providing beforehand cushioning protection. In the event of hose failure during high-pressure service testing, these pre-positioned valves can close to contain the failure and protect operators and equipment, cushioning the impact of potential hose bursts.
Data Source
AI summary
A method for testing a plurality of fire hoses having respective service test pressures and the test apparatus therefor wherein each hose is required to maintain a test pressure for a specified duration to pass the test. The test pressure is proportional to the service test pressure. Each hose is coupled to a respective hose fitting of a respective branch test conduit. Each branch test conduit includes an isolation valve, a pressure transducer, and a hose fitting downstream of the isolation valve. A variable frequency-variable speed controls a motor which drives a positive displacement water pump supplying water to and pressurizing a water header conduit and a plurality of branch test conduits interconnected therewith. An algorithm applied to the error signal for a respective hose line generates a pump speed command limited by the controller to regulate the rate of increase of pump output pressure.