The construction unit needs to regularly inspect, test, and maintain the water mist fire extinguishing system to ensure that the system is in good condition. The maintenance and repair of the system should be conducted by companies that have the experience of designing and installing water mist fire extinguishing systems. The operation and management of the system requires the development of management, test and maintenance procedures, and clear managerial responsibilities. At the same time, due to the high water pressure of the water mist system, the high water quality requirements, the large number of system components, and the complexity of the water mist system, the maintenance personnel are required to have high quality and are familiar with the operation and maintenance methods of the system. Therefore, the water mist fire extinguishing system is required. The maintenance managers are professionally trained.
First, system operation and inspection
The water mist fire extinguishing system shall be provided with specially trained personnel responsible for the management and operation of the system. The maintenance manager shall conduct daily inspections of the system and carefully fill in the inspection records. The inspection of the water mist fire extinguishing system is mainly for the daily inspection of the appearance of the system components, the on-site operation status, the working status of the system detection device, and the environmental conditions of the installation site.
(I) Inspection content
The inspection of the water mist fire extinguishing system mainly includes the connection of the main power and standby power of the system; the appearance and working status of the fire pump unit and the regulated pump; the appearance and opening and closing state of various valves such as control valves; system gas cylinders and water bottles The appearance and working environment of the water storage tank; the appearance and working status of the release indicator, alarm controller, spray head and other components; the marking status of the system's logo and instructions for use; the pressure value of the water testing device at the end of the closed system; Protection zone status, etc.
(B) inspection methods and requirements
Visual inspection is used to check the appearance of the system and its components, the status of valve opening and closing, the working status of the electrical equipment and its control devices, and the working conditions of pressure monitoring devices (pressure gauges, pressure switches). Specific inspection requirements are as follows:
1. Check the power distribution control cabinets of the system such as fire-fighting pumps and regulated voltage pumps to observe whether the voltage and current monitoring is normal; check whether the power supply of the system monitoring equipment is normal, and whether the power components such as solenoid valves and modules in the system are used. power ups.
2. Check whether the motor of the high-pressure pump group has any heating phenomenon; check whether the constant-voltage pump is started frequently; check the status of the control panel and the display signal status of the pump control cabinet (disc); check whether the connection pipeline of the pump group is leaking; Whether the main outlet valve is open; check whether the pump startup control and the main and backup pump switching control are set to the “automatic†position
3. Check whether the signs of various valves such as the zone control valves (groups) are in good condition and clear; check whether the permanent signs corresponding to the protection zone or the protection object set on the zone control valve are easy to observe; check the permanent flow indication on the valve body. Whether the sign is easy to observe and is consistent with the direction of water flow; check whether the components of the zone control valve group are complete, whether there is damage, whether there is water leakage, etc.; check whether each valve is in the normal position.
4. Check the appearance of the gas cylinders, water bottles, and water tanks for signs of no obvious bumps or damage; check the pressure display devices of the gas cylinders, water bottles, etc., for proper status; check whether the liquid level display devices of the water tanks are working properly. Cold and cold areas Check whether the room temperature of the water storage equipment is lower than 5°C.
5. Check whether the release indicator, alarm controller, etc. are in the normal state; check the appearance of the nozzle for obvious bumps or damage, whether the nozzle is leaking or removed, or blocked.
6. Check whether the system manual activation device and bottle group system mechanical emergency operation device identification is correct, clear, complete, whether in the correct position, whether it clearly corresponds to the place it protects; check the installation system place and the system manual operation position Whether there is a clear system operating instructions.
7. The inspection method and requirements for the end-of-water testing device of the closed system are detailed in related contents.
8. Check if the nature of use of the system protection zone changes; check whether there is ceiling decoration affecting the normal use of the nozzle in the protection zone; check whether there are major changes in the quantity and arrangement of combustibles in the protection zone.
Second, the system periodic inspection and maintenance
The system and system components are periodically checked and maintained to determine that their functions meet the requirements. Contents of inspection and maintenance are mainly based on the following differences:
(a) The contents and requirements of the monthly inspection
1. Check the appearance of system components for collision-free deformation and other mechanical damage;
2. Check whether the partition control valve is operating normally.
3. Check whether the seal or chain on the valve is in good condition and whether the valve is in the correct position;
4. Check whether the water level of the storage tank and the water storage container and the gas pressure in the air storage container meet the design requirements;
5. For the closed system, use the test valve to test the feedback condition of the motion signal to observe whether it is normal operation and display;
6. Check whether the appearance and standby quantity of the nozzle meet the requirements;
7. Check whether the guards, seals, etc. of the manual operation device are intact.
(II) Contents and requirements of the quarterly inspection
1. Through the test valve to the pump group system to conduct a discharge test, check the pump set to start, the main pump and switch alarm linkage function is normal;
2. Check if the control valve action of the bottle group system is normal;
3. Check whether the pipe and support and hanger are loose and whether the pipe connection is deformed, aged or cracked.
(III) Contents and Requirements of the Annual Inspection
1. Regularly measure the water supply capacity of the system water source;
2. Perform a complete inspection of the system components, piping and fittings, clean the storage tank, filter, and purge the piping behind the control valve;
3. The water storage tank is changed once every six months. The water in the storage container is periodically changed according to the requirements of the product manufacturer.
4. Perform the system simulation linkage function test. For details of the test contents and requirements, refer to section 3 of the fourth section.
(IV) System maintenance and management follow-up requirements
1. After problems are found in the system maintenance check, they must be dealt with in accordance with the specified requirements for specific problems. Such as the replacement of damaged nozzles, hangers, replacement valve seals; lubrication control valve stems, cleaning filters, etc.;
2. After the system inspection and simulation test, all the valves of the system are restored to working condition;
3. Compare the results of inspections and simulations with previous test results or test results for completion acceptance to see if they are consistent.
Third, the system of annual testing
The annual inspection is a periodical functional inspection and test conducted annually by the building's use and management units in accordance with relevant laws and regulations and national fire-fighting technical standards. Annual inspections of construction use and management units can be commissioned by qualified fire-fighting technical service units.
(a) water mist nozzle
Check whether the nozzle selection and the function of the protection area are matched. Whether the closed bubble glass bubble color mark is higher than the maximum temperature of the protective zone environment of 30°C; check the appearance of the nozzle to see if there are obvious bumps, scratches, deformation, damage, and whether the nozzle is leaking. Or be removed, obstructed, etc.; Check whether the open nozzle is blocked by the nozzle.
(B) Partition control valve
1. Check content and requirements
(1) Check the appearance of the zone control valves, signs, markings, and requirements in line with product standards and design requirements;
(2) Test the manual/automatic control function of the open system partition control valve, requiring normal opening and signal feedback;
(3) Check the open and closed status of the closed system partition control valve. The partition control valve is required to open normally and has a switch lock or switch indication function.
2. Check the operation procedure
(1) Check whether the appearance of the zone control valve is intact, non-destructive, whether the mark and mark are clear, and whether it corresponds to the protection zone that it protects;
(2) For open systems, open the bleed test valve after the zone closes the control valve and close the subsequent control valve;
(3) Use special test instruments or other methods to input simulated fire signals to the fire detector and check whether the fire alarm controller promptly starts the open system partition control valve after receiving the fire alarm signal to check if there is a discharge test valve. The water flows out; and in the corresponding control device, the operation status of the partition control valve and the signal feedback condition are viewed;
(4) Press the manual button outside the protection area to check whether the open system partition control valve is opened in time. Check if there is water flowing out after the discharge test valve; and check the operation status and signal feedback status of the partition control valve on the corresponding control equipment. ;
(5) cut off the electric valve control power simulation emergency mechanical start, open the electric valve by hand crank, check open system partition control valve action conditions are consistent with the contents of 3);
(6) manually close the open system partition control valve, close the discharge test valve, open the subsequent control valve, reset the system and return to working condition;
(7) For the closed system, check whether the system partition control valve is open, check whether the valve opening and closing signs are obvious, and whether it is fixed with the lock; if using the signal valve, put water at the test valve or manually close the partition control valve to check The signal feedback is correct.
(III) Open system linkage function
1. Check content and requirements
Through alarm linkage, the open system linkage control function is tested to simulate the water mist spray test to check whether the zone control valve, pump group or bottle group can act in time and send corresponding action signals. The system's action signal feedback device can The system initiates a feedback signal in a timely manner. Whether the nozzle in the protection area or the protected area of ​​the protection object sprays a fine mist or not, the warning light at the entrance of the corresponding place is actuated.
2. Check the operation procedure
(1) Use special test instruments or other methods to input simulated fire signals to fire detectors to check whether the fire alarm controller emits audible and visual alarm signals and whether the associated interlocking control device issues an automatic shutoff command;
(2) Check the corresponding operation status of the zone control valve, the pump group or the bottle group, and the display of the operation status on the corresponding control device;
(3) Check the spray condition of the system and use a stopwatch to measure the time interval between the alarm signal from the fire alarm device and the fine water mist spray nozzle to check whether the system meets the response time requirement;
(4) Check the signal feedback status of the system action signal feedback device and the action of the device such as the spray indicator light at the entrance of the protection zone;
(5) System reset, return to working condition.
(4) Closed system linkage function
1. Check content and requirements
Test the closed system linkage function by putting the water at the end. Check whether the pump group can start in time and send corresponding action signals; whether the system's action signal feedback device can send out the system start feedback signal in time.
2. Check the operation procedure
(1) Open the test valve, check and record the value change of the pressure gauge;
(2) Use a stopwatch to measure the time interval between the opening of the test valve and the start of the fire pump. Check if the pump set starts in time. Check the status of the pump displayed on the pump control cabinet and other control devices.
(3) Check the status of the flow sensor, pressure switch, and signal feedback displayed by the control device;
(4) When the zone control valve adopts the signal valve, check the signal feedback condition of the valve displayed by the control device;
(5) Close the test valve, reset the system, and return to working condition.
Fourth, system common fault analysis
When performing periodic system checks, it is necessary to timely analyze the cause of the fault and eliminate the fault to ensure that the system is intact and effective.
(I) Analysis and Treatment of Common Faults of Pump Units
1. There is leakage at the pump assembly connection
(1) Failure Analysis
1 connector loose;
2 The O-ring or gasket is damaged at the connection;
3 connector is damaged.
(2) Troubleshooting
1 screw connection;
2 Replace O-rings or gaskets;
3 Replace the connector.
2. Low pump outlet pressure
(1) Failure Analysis
1 pump set test valve is not closed;
2 Inverted input power to the pump unit;
3 high-pressure pump damage;
4 The usage flow exceeds the rated value.
(2) Troubleshooting
1 Close the pump set test valve;
2 Adjust the phase sequence of the incoming power supply;
3 replace the high pressure pump;
4 Operate within the pump set rating.
3. The pump set does not start
(1) Failure Analysis
1 high pressure pump contactor is not closed;
2 The pump set stops the contacts open;
3LOGO! Not executing the program;
4 power is not connected;
5 water level protection.
(2) Troubleshooting
1 Closed contactor;
2 Close the pump set stop contact;
3 maintenance LOGO! Replace if necessary;
4 power on;
5 Restore the tank water level.
4. Regulator pump starts frequently
(1) Failure Analysis
1 pipeline leakage;
2 safety relief valve seal is not good;
3 test valve is not closed;
4 Check valve seals adhere to impurities.
(2) Troubleshooting
1 Leakage point of pipeline leakage;
2 maintenance safety relief valve;
3 completely close the test valve;
4 Clean the check valve and clean the tank and piping.
5. Regulated pump can not restore pressure within the specified time
(1) Failure Analysis
1 residual air in the pipeline;
2 pipeline leakage;
3 high pressure ball valve leakage;
4 regulator pump outlet pressure is low;
5 Regulator pump is damaged.
(2) Troubleshooting
1 completely eliminate the air pipe;
2 leakage of pipeline leakage;
3 See below for troubleshooting of high pressure ball valve leakage;
4 Regulator pump pressure adjustment screw;
5 Replace the regulated pump.
(II) Analysis and Handling of Common Faults in Water Storage Tanks
1. The water quality of the storage tank is unqualified and the water storage capacity is insufficient
(1) Failure Analysis
1 Water is drawn from domestic water, but it produces germs for long periods of time.
2 inlet valve can not enter the water;
3 Incoming water control valve is closed by mistake.
(2) Troubleshooting
1 Water tanks shall be provided directly by professional manufacturers and shall not be processed on site by the construction unit;
2 at the bottom of the tank set vent valve;
3 Inlet control valve Select the valve with electric signal.
2. Adjust the tank low level alarm or stop pump
(1) Failure Analysis
1 The filter inlet pressure is low;
2 Filter filter plugging;
3 Inflow solenoid valve foreign matter is blocked.
(2) Troubleshooting
1 ensure that the inlet pressure is not less than 0.2MPa;
2 Clean or replace the filter element;
3 Clean the inlet solenoid valve.
(III) Analysis and Handling of Common Failures of Partition Control Valves
1 partition control valve is not convenient to operate, misuse
(1) Failure Analysis
1 In order to prevent erroneous operation, setting the control valve at a high position outside the protection area is not convenient to operate;
2 When the installation position is appropriate, other personnel malfunction.
(2) Troubleshooting
A plexiglass box is located outside the control valve and marked as "non-fire-free."
2. The bottle group system partition control valve manual starting device can not operate
(1) Failure Analysis
When the solenoid valve is used as the zone control valve in the bottle group system, the electromagnetic activation valve is equipped with a manual emergency starting device. In case of an emergency, the manual safety pin is pulled out. When the manual button is clicked, the starting valve can be actuated and the starting device sprays the fire. . After the electromagnetic valve is tested, the spring of the operating mechanism is in a state of being pressed. To prevent malfunction during installation, commissioning and transportation, the operating mechanism is locked by the auxiliary safety pin and it is easy to forget to pull it out after the system is put into use. Out of the insurance pin, the electromagnetic activation valve action mechanism cannot operate.
(2) Troubleshooting
After the system is installed and commissioned and put into use, the auxiliary insurance pin must be pulled out, and this job must be explicitly written into the system operation management operation and maintenance procedures of the user.
3 electric valve does not move
(1) Failure Analysis
1 power wiring connection is bad;
2 exceeds the allowable range of the power voltage;
3 The valve core is mixed with impurities and stuck;
4 Electric device burned or short circuited.
(2) Troubleshooting
1 Press the power wiring;
2 Adjust the voltage within the allowable range;
3 cleaning valve core;
4 Replace the electric device.
4. High pressure ball valve leakage
(1) Failure Analysis
1 The water in the pipeline is cut with impurities;
2 handles are tightened with hexagonal screws;
3O ring damage.
(2) Troubleshooting
1 Replace the gasket and clean the pipe;
2 tighten tight hexagonal screws;
3 Replace the O-ring.
5. Pressure switch alarm
(1) Failure Analysis
1 high pressure ball valve leakage;
2 High pressure ball valve is not closed in place;
3 pressure switch is not reset;
4 The pressure switch is damaged.
(2) Troubleshooting
1 See the above method for troubleshooting leakage of high pressure ball valve;
2 Use the handle to close the electric valve to zero position;
3 Press the pressure switch to reset;
4 Replace the pressure switch.
(4) Analysis and handling of common failures of water mist nozzles
Nozzle spray is not normal
(1) Failure Analysis
1 There are impurities in the pipeline to block the nozzle;
2 nozzle working pressure is low.
(2) Troubleshooting
1 See the nozzle plugging solution below;
2 Ensure that the working pressure of the nozzle is not less than its minimum design working pressure.
2. Sprinkler
(1) Failure Analysis
1 The quality of water supply is irrational, and sand and dirt are found in the water.
2 The environment where the nozzle is located is more dust and impurities.
(2) Troubleshooting
1 Before the installation of the nozzle, the pipe network should be purged, and the sand and dirt etc. at the nozzle filter should be cleaned after each use.
2 After the completion of the debugging, apply a grease with a consistency rating of 4 to 6 on the nozzle hole, a drop point of not less than 95°C, a rust-preventive grease, or other dust-proof measures.
First, system operation and inspection
The water mist fire extinguishing system shall be provided with specially trained personnel responsible for the management and operation of the system. The maintenance manager shall conduct daily inspections of the system and carefully fill in the inspection records. The inspection of the water mist fire extinguishing system is mainly for the daily inspection of the appearance of the system components, the on-site operation status, the working status of the system detection device, and the environmental conditions of the installation site.
(I) Inspection content
The inspection of the water mist fire extinguishing system mainly includes the connection of the main power and standby power of the system; the appearance and working status of the fire pump unit and the regulated pump; the appearance and opening and closing state of various valves such as control valves; system gas cylinders and water bottles The appearance and working environment of the water storage tank; the appearance and working status of the release indicator, alarm controller, spray head and other components; the marking status of the system's logo and instructions for use; the pressure value of the water testing device at the end of the closed system; Protection zone status, etc.
(B) inspection methods and requirements
Visual inspection is used to check the appearance of the system and its components, the status of valve opening and closing, the working status of the electrical equipment and its control devices, and the working conditions of pressure monitoring devices (pressure gauges, pressure switches). Specific inspection requirements are as follows:
1. Check the power distribution control cabinets of the system such as fire-fighting pumps and regulated voltage pumps to observe whether the voltage and current monitoring is normal; check whether the power supply of the system monitoring equipment is normal, and whether the power components such as solenoid valves and modules in the system are used. power ups.
2. Check whether the motor of the high-pressure pump group has any heating phenomenon; check whether the constant-voltage pump is started frequently; check the status of the control panel and the display signal status of the pump control cabinet (disc); check whether the connection pipeline of the pump group is leaking; Whether the main outlet valve is open; check whether the pump startup control and the main and backup pump switching control are set to the “automatic†position
3. Check whether the signs of various valves such as the zone control valves (groups) are in good condition and clear; check whether the permanent signs corresponding to the protection zone or the protection object set on the zone control valve are easy to observe; check the permanent flow indication on the valve body. Whether the sign is easy to observe and is consistent with the direction of water flow; check whether the components of the zone control valve group are complete, whether there is damage, whether there is water leakage, etc.; check whether each valve is in the normal position.
4. Check the appearance of the gas cylinders, water bottles, and water tanks for signs of no obvious bumps or damage; check the pressure display devices of the gas cylinders, water bottles, etc., for proper status; check whether the liquid level display devices of the water tanks are working properly. Cold and cold areas Check whether the room temperature of the water storage equipment is lower than 5°C.
5. Check whether the release indicator, alarm controller, etc. are in the normal state; check the appearance of the nozzle for obvious bumps or damage, whether the nozzle is leaking or removed, or blocked.
6. Check whether the system manual activation device and bottle group system mechanical emergency operation device identification is correct, clear, complete, whether in the correct position, whether it clearly corresponds to the place it protects; check the installation system place and the system manual operation position Whether there is a clear system operating instructions.
7. The inspection method and requirements for the end-of-water testing device of the closed system are detailed in related contents.
8. Check if the nature of use of the system protection zone changes; check whether there is ceiling decoration affecting the normal use of the nozzle in the protection zone; check whether there are major changes in the quantity and arrangement of combustibles in the protection zone.
Second, the system periodic inspection and maintenance
The system and system components are periodically checked and maintained to determine that their functions meet the requirements. Contents of inspection and maintenance are mainly based on the following differences:
(a) The contents and requirements of the monthly inspection
1. Check the appearance of system components for collision-free deformation and other mechanical damage;
2. Check whether the partition control valve is operating normally.
3. Check whether the seal or chain on the valve is in good condition and whether the valve is in the correct position;
4. Check whether the water level of the storage tank and the water storage container and the gas pressure in the air storage container meet the design requirements;
5. For the closed system, use the test valve to test the feedback condition of the motion signal to observe whether it is normal operation and display;
6. Check whether the appearance and standby quantity of the nozzle meet the requirements;
7. Check whether the guards, seals, etc. of the manual operation device are intact.
(II) Contents and requirements of the quarterly inspection
1. Through the test valve to the pump group system to conduct a discharge test, check the pump set to start, the main pump and switch alarm linkage function is normal;
2. Check if the control valve action of the bottle group system is normal;
3. Check whether the pipe and support and hanger are loose and whether the pipe connection is deformed, aged or cracked.
(III) Contents and Requirements of the Annual Inspection
1. Regularly measure the water supply capacity of the system water source;
2. Perform a complete inspection of the system components, piping and fittings, clean the storage tank, filter, and purge the piping behind the control valve;
3. The water storage tank is changed once every six months. The water in the storage container is periodically changed according to the requirements of the product manufacturer.
4. Perform the system simulation linkage function test. For details of the test contents and requirements, refer to section 3 of the fourth section.
(IV) System maintenance and management follow-up requirements
1. After problems are found in the system maintenance check, they must be dealt with in accordance with the specified requirements for specific problems. Such as the replacement of damaged nozzles, hangers, replacement valve seals; lubrication control valve stems, cleaning filters, etc.;
2. After the system inspection and simulation test, all the valves of the system are restored to working condition;
3. Compare the results of inspections and simulations with previous test results or test results for completion acceptance to see if they are consistent.
Third, the system of annual testing
The annual inspection is a periodical functional inspection and test conducted annually by the building's use and management units in accordance with relevant laws and regulations and national fire-fighting technical standards. Annual inspections of construction use and management units can be commissioned by qualified fire-fighting technical service units.
(a) water mist nozzle
Check whether the nozzle selection and the function of the protection area are matched. Whether the closed bubble glass bubble color mark is higher than the maximum temperature of the protective zone environment of 30°C; check the appearance of the nozzle to see if there are obvious bumps, scratches, deformation, damage, and whether the nozzle is leaking. Or be removed, obstructed, etc.; Check whether the open nozzle is blocked by the nozzle.
(B) Partition control valve
1. Check content and requirements
(1) Check the appearance of the zone control valves, signs, markings, and requirements in line with product standards and design requirements;
(2) Test the manual/automatic control function of the open system partition control valve, requiring normal opening and signal feedback;
(3) Check the open and closed status of the closed system partition control valve. The partition control valve is required to open normally and has a switch lock or switch indication function.
2. Check the operation procedure
(1) Check whether the appearance of the zone control valve is intact, non-destructive, whether the mark and mark are clear, and whether it corresponds to the protection zone that it protects;
(2) For open systems, open the bleed test valve after the zone closes the control valve and close the subsequent control valve;
(3) Use special test instruments or other methods to input simulated fire signals to the fire detector and check whether the fire alarm controller promptly starts the open system partition control valve after receiving the fire alarm signal to check if there is a discharge test valve. The water flows out; and in the corresponding control device, the operation status of the partition control valve and the signal feedback condition are viewed;
(4) Press the manual button outside the protection area to check whether the open system partition control valve is opened in time. Check if there is water flowing out after the discharge test valve; and check the operation status and signal feedback status of the partition control valve on the corresponding control equipment. ;
(5) cut off the electric valve control power simulation emergency mechanical start, open the electric valve by hand crank, check open system partition control valve action conditions are consistent with the contents of 3);
(6) manually close the open system partition control valve, close the discharge test valve, open the subsequent control valve, reset the system and return to working condition;
(7) For the closed system, check whether the system partition control valve is open, check whether the valve opening and closing signs are obvious, and whether it is fixed with the lock; if using the signal valve, put water at the test valve or manually close the partition control valve to check The signal feedback is correct.
(III) Open system linkage function
1. Check content and requirements
Through alarm linkage, the open system linkage control function is tested to simulate the water mist spray test to check whether the zone control valve, pump group or bottle group can act in time and send corresponding action signals. The system's action signal feedback device can The system initiates a feedback signal in a timely manner. Whether the nozzle in the protection area or the protected area of ​​the protection object sprays a fine mist or not, the warning light at the entrance of the corresponding place is actuated.
2. Check the operation procedure
(1) Use special test instruments or other methods to input simulated fire signals to fire detectors to check whether the fire alarm controller emits audible and visual alarm signals and whether the associated interlocking control device issues an automatic shutoff command;
(2) Check the corresponding operation status of the zone control valve, the pump group or the bottle group, and the display of the operation status on the corresponding control device;
(3) Check the spray condition of the system and use a stopwatch to measure the time interval between the alarm signal from the fire alarm device and the fine water mist spray nozzle to check whether the system meets the response time requirement;
(4) Check the signal feedback status of the system action signal feedback device and the action of the device such as the spray indicator light at the entrance of the protection zone;
(5) System reset, return to working condition.
(4) Closed system linkage function
1. Check content and requirements
Test the closed system linkage function by putting the water at the end. Check whether the pump group can start in time and send corresponding action signals; whether the system's action signal feedback device can send out the system start feedback signal in time.
2. Check the operation procedure
(1) Open the test valve, check and record the value change of the pressure gauge;
(2) Use a stopwatch to measure the time interval between the opening of the test valve and the start of the fire pump. Check if the pump set starts in time. Check the status of the pump displayed on the pump control cabinet and other control devices.
(3) Check the status of the flow sensor, pressure switch, and signal feedback displayed by the control device;
(4) When the zone control valve adopts the signal valve, check the signal feedback condition of the valve displayed by the control device;
(5) Close the test valve, reset the system, and return to working condition.
Fourth, system common fault analysis
When performing periodic system checks, it is necessary to timely analyze the cause of the fault and eliminate the fault to ensure that the system is intact and effective.
(I) Analysis and Treatment of Common Faults of Pump Units
1. There is leakage at the pump assembly connection
(1) Failure Analysis
1 connector loose;
2 The O-ring or gasket is damaged at the connection;
3 connector is damaged.
(2) Troubleshooting
1 screw connection;
2 Replace O-rings or gaskets;
3 Replace the connector.
2. Low pump outlet pressure
(1) Failure Analysis
1 pump set test valve is not closed;
2 Inverted input power to the pump unit;
3 high-pressure pump damage;
4 The usage flow exceeds the rated value.
(2) Troubleshooting
1 Close the pump set test valve;
2 Adjust the phase sequence of the incoming power supply;
3 replace the high pressure pump;
4 Operate within the pump set rating.
3. The pump set does not start
(1) Failure Analysis
1 high pressure pump contactor is not closed;
2 The pump set stops the contacts open;
3LOGO! Not executing the program;
4 power is not connected;
5 water level protection.
(2) Troubleshooting
1 Closed contactor;
2 Close the pump set stop contact;
3 maintenance LOGO! Replace if necessary;
4 power on;
5 Restore the tank water level.
4. Regulator pump starts frequently
(1) Failure Analysis
1 pipeline leakage;
2 safety relief valve seal is not good;
3 test valve is not closed;
4 Check valve seals adhere to impurities.
(2) Troubleshooting
1 Leakage point of pipeline leakage;
2 maintenance safety relief valve;
3 completely close the test valve;
4 Clean the check valve and clean the tank and piping.
5. Regulated pump can not restore pressure within the specified time
(1) Failure Analysis
1 residual air in the pipeline;
2 pipeline leakage;
3 high pressure ball valve leakage;
4 regulator pump outlet pressure is low;
5 Regulator pump is damaged.
(2) Troubleshooting
1 completely eliminate the air pipe;
2 leakage of pipeline leakage;
3 See below for troubleshooting of high pressure ball valve leakage;
4 Regulator pump pressure adjustment screw;
5 Replace the regulated pump.
(II) Analysis and Handling of Common Faults in Water Storage Tanks
1. The water quality of the storage tank is unqualified and the water storage capacity is insufficient
(1) Failure Analysis
1 Water is drawn from domestic water, but it produces germs for long periods of time.
2 inlet valve can not enter the water;
3 Incoming water control valve is closed by mistake.
(2) Troubleshooting
1 Water tanks shall be provided directly by professional manufacturers and shall not be processed on site by the construction unit;
2 at the bottom of the tank set vent valve;
3 Inlet control valve Select the valve with electric signal.
2. Adjust the tank low level alarm or stop pump
(1) Failure Analysis
1 The filter inlet pressure is low;
2 Filter filter plugging;
3 Inflow solenoid valve foreign matter is blocked.
(2) Troubleshooting
1 ensure that the inlet pressure is not less than 0.2MPa;
2 Clean or replace the filter element;
3 Clean the inlet solenoid valve.
(III) Analysis and Handling of Common Failures of Partition Control Valves
1 partition control valve is not convenient to operate, misuse
(1) Failure Analysis
1 In order to prevent erroneous operation, setting the control valve at a high position outside the protection area is not convenient to operate;
2 When the installation position is appropriate, other personnel malfunction.
(2) Troubleshooting
A plexiglass box is located outside the control valve and marked as "non-fire-free."
2. The bottle group system partition control valve manual starting device can not operate
(1) Failure Analysis
When the solenoid valve is used as the zone control valve in the bottle group system, the electromagnetic activation valve is equipped with a manual emergency starting device. In case of an emergency, the manual safety pin is pulled out. When the manual button is clicked, the starting valve can be actuated and the starting device sprays the fire. . After the electromagnetic valve is tested, the spring of the operating mechanism is in a state of being pressed. To prevent malfunction during installation, commissioning and transportation, the operating mechanism is locked by the auxiliary safety pin and it is easy to forget to pull it out after the system is put into use. Out of the insurance pin, the electromagnetic activation valve action mechanism cannot operate.
(2) Troubleshooting
After the system is installed and commissioned and put into use, the auxiliary insurance pin must be pulled out, and this job must be explicitly written into the system operation management operation and maintenance procedures of the user.
3 electric valve does not move
(1) Failure Analysis
1 power wiring connection is bad;
2 exceeds the allowable range of the power voltage;
3 The valve core is mixed with impurities and stuck;
4 Electric device burned or short circuited.
(2) Troubleshooting
1 Press the power wiring;
2 Adjust the voltage within the allowable range;
3 cleaning valve core;
4 Replace the electric device.
4. High pressure ball valve leakage
(1) Failure Analysis
1 The water in the pipeline is cut with impurities;
2 handles are tightened with hexagonal screws;
3O ring damage.
(2) Troubleshooting
1 Replace the gasket and clean the pipe;
2 tighten tight hexagonal screws;
3 Replace the O-ring.
5. Pressure switch alarm
(1) Failure Analysis
1 high pressure ball valve leakage;
2 High pressure ball valve is not closed in place;
3 pressure switch is not reset;
4 The pressure switch is damaged.
(2) Troubleshooting
1 See the above method for troubleshooting leakage of high pressure ball valve;
2 Use the handle to close the electric valve to zero position;
3 Press the pressure switch to reset;
4 Replace the pressure switch.
(4) Analysis and handling of common failures of water mist nozzles
Nozzle spray is not normal
(1) Failure Analysis
1 There are impurities in the pipeline to block the nozzle;
2 nozzle working pressure is low.
(2) Troubleshooting
1 See the nozzle plugging solution below;
2 Ensure that the working pressure of the nozzle is not less than its minimum design working pressure.
2. Sprinkler
(1) Failure Analysis
1 The quality of water supply is irrational, and sand and dirt are found in the water.
2 The environment where the nozzle is located is more dust and impurities.
(2) Troubleshooting
1 Before the installation of the nozzle, the pipe network should be purged, and the sand and dirt etc. at the nozzle filter should be cleaned after each use.
2 After the completion of the debugging, apply a grease with a consistency rating of 4 to 6 on the nozzle hole, a drop point of not less than 95°C, a rust-preventive grease, or other dust-proof measures.
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