The electric fire pump is basically the same as the general industrial pump. It is an important part of the fire engineering equipment, which determines the quality and performance of the entire fire protection system. It is by using the pressure difference to press the water flow to the height required by itself, but the fire pump pays attention to the advantages of efficiency and lift, so the design of the fire pump must take into account the power of the pump and good maintenance, because of the fire. With uncertainty, the space and time requirements are relatively high, and the fire pump should be as efficient and large as possible in use, which has a very good effect on suppressing fire.
Before the fire pump is used, some test items, such as water pressure test, water flushing, water source test, fire pump test, steady pump test, alarm valve test, drain test, linkage test, etc., are required.
First, the water pressure test
1. System pressure test principle
The system pressure test is carried out according to the principle of the first main pipe, the rear main pipe and the second branch pipe; the pipe pressure test is carried out according to the system segmentation, each area of ??the fire main pipe is a single unit, and the fire sprinkler pipe basement is a single unit in each area. The concealed and buried pipelines are subjected to a single hydrostatic test before concealing, and the overall hydrostatic test is carried out after the installation of the piping system.
2. Sectional pressure test
Before the partial pressure test, the water supply point shall be determined according to the site conditions. The drainage after the pressure test shall be organized and discharged, and shall not pollute other pipelines and equipment that have been constructed. When the system is pressure tested, draw the pressure test system diagram first, and set the blind plate and discharge port as required.
3. Test point settings
The test points for the hydraulic strength test are set at the low point of the pipe network. The test pressure is 1.5 times the working pressure and not less than 1.5 MPa. When water is injected into the pipe network, the air in the pipe network should be drained and gradually boosted. After the test pressure is reached, the pressure drop of the fire water supply pipe system within 10 minutes under the test pressure should not exceed 0.02 MPa, and then it should be reduced to work. The pressure is checked and the pressure should remain the same and will not leak.
Second, water rinse
After the pipeline is pressure tested, it can be flushed. Before the official delivery, the municipal tap water is continuously flushed to observe the water in the water tank and the water outlet. The turbidity, transparency, color and water intake are basically the same. The flushing sequence is first outdoor and rear indoor, first underground and back ground, and the indoor pipe network is divided into several loop flushes.
The regulating valve, the filter screen of the filter and the relevant instrument are installed after the pipeline is pressure tested and flushed. Water should not pass through all equipment when flushing. The pipe after flushing should be blocked in time to prevent dirt from entering.
Third, the water source test
Check whether the volume and elevation of the fire water tank meet the design requirements. Verify the number of fire pump combiners and water supply capacity, and use the mobile fire pump combiner for water supply test to verify whether the water supply capacity can meet the design requirements.
Fourth, fire pump test
When starting in manual or automatic mode, it should be in normal operation within 5min. After the backup power is switched, the pump should be put into normal operation within 90s.
Five, steady pump test
The analog design start condition, the steady voltage pump should start immediately; when the system design pressure is reached, the steady pressure pump should stop running automatically.
Sixth, alarm valve test
Wet alarm valve
When the water is released at the water test device, the alarm valve should be opened in time, and the delay should be within 5~90s. The hydraulic alarm should be alarmed. At the same time, the water flow indicator outputs the alarm electric signal, the pressure switch is connected to the circuit alarm, and the fire pump should be started.
2. Pre-action alarm valve
After opening the system test valve, test the start time of the alarm system and the time required for the water to flow to the exit of the test device, which should meet the design requirements.
Seven, drainage device test
This test determines whether the system pressure can reach the design pressure based on the maximum design spray volume of the system, so that the water spray effect can be guaranteed after the fire is completely opened. During the test, the main drain valve of the full-open drain device shall be subjected to a drainage test according to the maximum designed fire extinguishing water volume of the system, and the pressure shall be stable. During the test, water should be drained from the drainage system in time.
Eight, linkage test
Use a dedicated test instrument or other method to input the fire alarm signal, understand the responsiveness of the automatic alarm controller, and whether it can send out an alarm signal and start the system in time. In addition, the flow rate (0.94~1.33L / s) of the nozzle is discharged from the end water test device, and whether the water flow indicator, the pressure switch, the hydraulic alarm, the fire pump, etc. can emit corresponding signals and actions in time.