![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
Foam fluid and system components (equipment) on-site inspection
First, on-site inspection of foam liquid
Under normal circumstances, after the foam liquid enters the site, it needs to be sampled and kept on site, so that it can be submitted for inspection in the future.
1. Check content and requirements
Because the foam liquid is the key material of the foam fire extinguishing system, it needs to be sent to a qualified testing unit for testing. The foam liquid belonging to one of the following cases needs to be submitted for inspection:
( 1 ) The design amount of 6 % type low multiple foaming liquid is greater than or equal to 7.0t ;
( 2 ) The designed amount of 3 % type low multiple foaming liquid is greater than or equal to 3.5t ;
( 3 ) The minimum stock of multiple foam liquid in 6% protein type is greater than or equal to 2.5t ;
( 4 ) The minimum stock of multiple foam liquids in 6 % synthetic type is greater than or equal to 2.0t ;
( 5 ) The minimum reserve of high-strength foam liquid is greater than or equal to 1.0t ;
( 6 ) The foam liquid required by the on-site sampling and inspection as stipulated in the contract documents.
2. Detection method: For sampling foam liquid retained, conduct inspection and inspection and check the market access system requirements of the effective certification documents and product exemption certificate can be; for the need to submit the foam liquid, according to the current national standard "foam fire Agent" GB15308 regulations on the relevant parameters for testing. The foam liquid is mainly tested for its foaming performance and fire extinguishing performance. The testing content mainly includes the foaming multiple, the time of liquid analysis, the extinguishing time and the anti-burning time.
Second, the system components on-site inspection
The on-site inspection of system components mainly includes the appearance quality inspection, performance inspection, strength and rigorous inspection of components.
(A) The appearance quality of system components
1. Check content and requirements
( 1 ) System components that need to be checked
The following components need to be inspected: foam generating device, foam proportioner ( device ) , foam liquid tank, foam fire pump, foam fire hydrant, valve, pressure gauge, pipeline filter, metal hose, etc.
( 2 ) Requirements that the component needs to meet
1 No deformation and other mechanical damage; 2 The exposed non-machined surface protective coating is in good condition; 3 The non-protected coated machined surface is not rusted; 4 All exposed interfaces are free from damage, and the protective coverings such as plugs and caps are well encapsulated; The nameplate mark is clear and firm; 6 The fire pump disc is flexible, no block, no abnormal sound; 7 The high-power foam generator turns the impeller by hand; 8 The manual mechanism of the fixed foam gun has no jamming phenomenon.
2. Detection method: observation inspection and manual inspection. For the manual mechanism in the assembly, if you need to rotate the part, you must manually operate to see if it can meet the requirements.
(B) performance check of system components
1. Check content and requirements
( 1 ) System components that need to be checked
Foam generator, foam proportioner ( device ) , foam fluid pressure tank, foam fire pump, foam fire hydrant, valve, pressure gauge, pipeline filter, metal hose, etc.
( 2 ) Requirements that the component needs to meet
1 The specifications, models and performances of the system components comply with the current national standard “General Technical Conditions for Foam Fire Extinguishing Systems and Components†GB20031 and design requirements.
2 When there are re-inspections on the design of the above components or if the construction party or construction party has doubts about the quality of the components, these components should be sent to the testing unit with corresponding qualifications for testing and re-inspection. The components to be inspected shall be under the responsibility of the supervision engineer. Sampling, specific retest results must meet the current national product standards and design requirements.
2. Detection method: Under normal circumstances, check the valid certification documents required by the market access system and the product factory certification. When the component needs retesting, it is tested according to the test method specified in the current national standard "General Technical Requirements for Foam Extinguishing System and Components" GB20031 and other related standards.
(c) Inspection of the strength and tightness of system components
1. Check content and requirements
( 1 ) System components that need to be checked
The foam fire extinguishing system has high requirements on the valve quality. For example, the leakage of the valve affects the pressure of the system and makes the system unable to operate normally. From the current situation, due to various reasons, the valve leakage phenomenon is more common, in order to ensure the construction quality of the system, the strength and tightness of the valve need to be tested.
( 2 ) Requirements to be met
1 Strength and tightness test should be carried out with clear water, the strength test pressure is 1.5 times the nominal pressure ; the tightness test pressure is 1.1 times the nominal pressure ;
2 The test pressure shall be kept constant during the test duration, and there shall be no leakage of the housing packing and the valve sealing surface;
3 The test duration of the valve pressure test should not be less than the specified
4 Qualified valves shall be drained of internal water and blow dried. Seal the surface with anti-rust oil, close the valve, close the entrance, and make a clear mark.
2. Detection method: The valve is installed in the test pipeline, there is a flow direction of the valve, the test pipeline to be installed in the valve inlet, and then the pipeline is full of water, clean air, with the pressure device slowly boost pressure until the tight After the sexual test pressure, in the shortest duration of the test, the sealing surface of the valve flap is acceptable; finally the pressure is increased to the strength test pressure. In the shortest test duration, no leakage of the casing packing is acceptable.
System components installation, debugging and inspection
First, the main components of the system installation and technical testing
The installation of the foam fire extinguishing system mainly includes the installation of components such as a foam liquid tank, a foam proportioner ( device ) , a valve, a bubble hydrant, and a bubble generation device.
(I) Installation of foam tank
1. General requirements
( 1 ) Installation requirements
The foam liquid storage tank must be left with channels that meet the maintenance requirements, its width can not be less than 0.7m , and the operation surface can not be less than 1.5m ; when the control valve on the foam liquid storage tank is greater than 1.8m from the ground , it needs to be in the operation surface. Place an operating platform or operating stool.
( 2 ) Detection method: Use a ruler to measure.
2. Installation of atmospheric foam tank
( 1 ) Installation requirements
1 At-site production of atmospheric steel foam liquid storage tanks, taking into account that the proportioning mixer can smoothly inhale the foam liquid from the tank, and at the same time prevent the rust and sediment in the tank from sucking into the tube and blocking the pipeline. The liquid port can not be higher than the minimum liquid level of the foam liquid storage tank by 1m , and the liquid suction port of the foam liquid pipe is not less than 0.15m from the bottom of the foam liquid storage tank , and is preferably made into a bell mouth shape;
2 Atmospheric steel foam liquid tanks produced on site need to be tested for tightness. The test pressure is the static pressure of the tank filled with water. The test time can not be less than 30 minutes , visual inspection can not have leakage;
3 The on-site and outer surfaces of the atmospheric pressure steel foam liquid tanks produced on site shall be treated according to the design requirements, and the anti-corrosion treatment shall be conducted after the stringency test is passed;
3. Installation of foam liquid pressure tank
( 1 ) Installation requirements
1 Foam liquid pressure storage tanks are provided with fixed brackets for channel steel or angle steel welding. When installed, anchor bolts are used to firmly anchor the foundations for concrete pouring on the ground; foam liquid pressure tanks are the styling equipment of manufacturers, There are attachments such as safety valves, feed holes, vent holes, slag holes, manholes, and sampling holes. They have been installed at the factory and tested. Therefore, they must not be disassembled or damaged during installation. In particular, the safety valve must not be easily removed. The outlet must not face the operating surface during installation. Otherwise, it may affect the safe use.
2 For foam liquid pressure tanks installed in the open air, sun protection, antifreeze and anti-corrosion measures shall be taken according to environmental conditions. When the ambient temperature is lower than 0 °C , antifreeze facilities need to be taken; when the ambient temperature is higher than 40 °C , cooling measures are needed; when it is installed in corrosive areas such as the sea, anti-corrosion measures are also needed. Because the temperature is too low, the flow of the foam liquid will be hindered, and the foaming multiples of various foam liquids will be decreased when the temperature is too high, the time for liquid extraction will be short, and the fire extinguishing performance will be reduced.
( 2 ) Detection method: observation and inspection.
(B) Installation of foam ratio mixer ( device )
1. General requirements
( 1 ) Installation requirements
1 When installing, make the foam proportioner ( device ) align with the direction of flow. All kinds of bubble proportion mixers ( devices ) have installation directions and are marked on them. Therefore, they cannot be installed reversely when installed. Otherwise, the foam cannot be sucked into the foam or the pump cannot foam into the foam so that the system cannot extinguish the fire. Therefore, when installing, special attention must be paid to the direction of the marking and the direction of flow.
(2 ) The installation of the foam proportioner ( device ) and the pipe connection must be tight and there must be no leakage. Otherwise, the mixing ratio will be affected.
( 2 ) Detection method: observation and inspection. The second item is mainly observed and checked during commissioning, because only when the pipeline is filled and commissioned, can the joint be observed for leakage.
2. Installation of Ring Pump Proportioner
( 1 ) Installation requirements
1 Connection sequence of each part: The inlet of the ring-pumped proportion mixer shall be connected with the outlet pipe section of the pump, and the outlet of the ring pump-type proportional mixer shall be connected with the inlet pipe section of the pump; the inlet of the ring pump-type proportional mixer shall be Connect to the outlet section on the foam tank.
2 The allowable deviation of the installed elevation of the ring pump proportional mixer is ± 10mm ;
3 In order to make the ring pump proportional mixer clogged or corrosive damage, the spare ring pump proportional mixer can be put into use immediately, and the spare ring pump type proportional mixer needs to be installed in parallel on the system with obvious signs. .
( 2 ) Detection methods: The first and third items were observed and checked, and the second item was checked using a wire and a ruler.
3. Installation of pressure proportional mixing device
( 1 ) Installation requirements
1 The pressure tank and proportioning mixer of the pressure proportional mixing device have been installed and fixed together before leaving the factory. Therefore, the pressure proportional mixing device should be installed as a whole. From the appearance, the pressure proportioner has horizontal and vertical two kinds of physical map shown in Figure 3-8-3-2. From the structural point of view, the pressure-type proportional mixing device can be divided into two kinds: no capsule type pressure proportion mixing device and capsule type pressure proportion mixing device.
2 pressure type proportional mixing device pressure tank inlet pipe pressure of 0.6 ~ 1.2MPa , and through the pressure proportional mixing device flow is also larger, there is a certain impact, so the installation of pressure-type proportional mixing device and the foundation Fixed firmly.
( 2 ) Detection method: observation and inspection.
4. Installation of balanced proportional mixing device
( 1 ) Installation requirements
1 The integral balanced proportional mixing device is composed of two parts: the balanced pressure flow control valve and the proportional mixer. The strength test and the mixing ratio calibration have been carried out before leaving the factory. Therefore, the entire vertical pressure mixing device needs to be installed vertically. On the horizontal pipeline, separate pressure gauges shall be installed on the horizontal pipelines of water and foam liquid inlet. To facilitate observation and accurate measurement of pressure values, the distance between the pressure gauge and the inlet of the balanced proportional mixing device shall not exceed 0.3m .
The balanced pressure flow control valve and proportional mixer of the two-body balance type proportional mixing device are separately arranged, and the flow adjustment range is relatively large, and the balanced pressure flow control valve is to be installed vertically.
3 The foam liquid pump of the hydraulic-driven balanced proportioning device must be installed horizontally, and the installation dimensions and connection of the pipelines must meet the design requirements.
Balanced foam ratio mixing device consists of foam liquid pump, foam proportioner, balanced pressure flow control valve and piping. The balanced proportion mixing device has a high proportion mixing accuracy, and the applicable foam mixture has a relatively large flow range. The foam liquid storage tank is an atmospheric pressure tank.
( 2 ) Detection methods: ruler size and observational examination.
5. Installation of pipeline proportional mixer
( 1 ) Installation requirements
1 The difference is that the pipeline proportional mixer is directly installed on the main line.
The working pressure of the pipeline-type proportional mixer is usually in the range of 0.7 to 1.3 MPa , and the pressure loss is more than 1/3 of the inlet pressure , and the mixing ratio is usually poor. For this reason it is mainly used for mobile foam systems, and many are used in conjunction with foam guns, foam guns, and foam generators, and are rarely used in fixed foam fire suppression systems.
2 In order to reduce the pressure loss, the installation position of the pipeline foam proportioner should be close to the tank or protection zone;
3 To ensure that the in-line foam proportioner can smoothly inhale the foaming liquid so that the mixing ratio is maintained within the normal range, the height difference between the liquid suction mouth of the proportioning mixer and the minimum liquid level of the foam liquid storage tank or the foam liquid barrel can not exceed 1.0m .
( 2 ) Detection methods: ruler check and observation check.
(c) Installation of valves
1. Installation requirements
( 3 ) Submerged injection and semi-liquid jet foam fire extinguishing systems The foam rods and check valves installed in the foam piping at the storage tank need to be installed horizontally. The direction marked on the check valve should be consistent with the flow direction of the foam. , otherwise the foam can not enter the tank, but the medium inside the tank may fall into the pipeline, causing greater accidents.
( 4 ) Pressure gauges, line filters, and control valves installed on the foam mixing pipe at the inlet end of the high-magnification foam generator are generally installed on the horizontal branch pipe.
( 5 ) The automatic exhaust valve provided on the foam mixture pipe should be installed vertically after the system is pressure tested and flushed.
( 6 ) When the foam mixture pipe is installed on the ground, the installation height of the control valve is generally controlled at 1.1 to 1.5m . When the ambient temperature is 0 °C and below, the cast iron control valve is used. If the pipe is installed on the ground, the cast iron control valve It should be installed on the riser; if the pipeline is buried or set in the trench, the cast iron control valve should be installed in the valve well or in the trench, and antifreeze measures must be taken.
( 7 ) When the fixed foam fire extinguishing system in the storage tank area also has semi-fixed system function, it is necessary to install a control valve and a tube-toothed interface on the foam mixed liquid pipe outside the fire-proof dyke to facilitate the fire truck or other movable type. The fire- fighting equipment is connected to the foam fire extinguishing equipment fixed in the tank area.
( 8 ) The control valve provided on the riser of the foam mixture has a mounting height of 1.1 to 1.5m , and requires a clear opening and closing sign. When the installation height of the control valve is greater than 1.8m , the operating platform needs to be set. Or operate the stool.
( 9 ) The return pipe with control valve provided on the discharge pipe of the fire pump must meet the design requirements. The installation height of the control valve is generally between 0.6 and 1.2m .
(D) Installation of bubble generating device
1. Installation of low magnification foam generator
( 1 ) Installation requirements
2 The installation of the foam chute in the water-soluble liquid storage tank shall spiral down along the inside of the tank wall to 1.0 to 1.5m from the bottom of the tank. The angle between the chute and the bottom plane of the tank is generally 30 ° to 45 °; the foam drop tank shall be installed vertically. The allowable verticality deviation is 5 高度 of the height of the drop tank , and does not exceed 30mm , the allowable deviation of coordinates is 25mm , and the allowable deviation of elevation is ± 20mm .
The high back pressure foam generator sprayed under the 3 liquid and half liquid is to be horizontally installed on the foam mixed liquid pipe outside the fireproof bank.
④ high back pressure gauge connection on the inlet side of the foam generator is provided to be installed vertically; the outlet side of the pressure gauge, a back pressure regulating valve and the sampling port installed size of the foam to meet the design requirements, and ambient temperature is 0 ℃ In the following regions, steel valves are required for back pressure regulators and control valves on foam sampling ports.
Also, semi-liquid ejecting apparatus requires lower foam integrally mounted on a steel pipe into the foam storage tank is provided at the level of the next shot valve and the check valve between the pipe, and using the dilator (retractor) or a metal tube with stopper Return valve connection, installation and can not be disassembled and damaged sealing film and its accessories.
( 2 ) Detection methods: observation and inspection.
3. Installation of high magnification foam generator
( 1 ) Installation requirements
1 High-magnification foam generators should be installed above the depth of foam inundation as close to the object of protection as possible, but they should not be affected by explosions or flames. At the same time, the installation should ensure that a uniform foam cover is easily formed in the protected area.
2 Under normal circumstances, make sure there is no obstructer at or less than 0.3m from the inlet end of the high-power foam generator .
3 There should be no obstacles affecting the foam discharge at a position less than or equal to 1.0 m before the foam net of the high-magnification foam generator .
4 The high-magnification foam generator should be installed as a whole and must not be disassembled. In addition, since the fan blades are rotated at a high speed by a power source, the vibration of the high-magnification foam generators is not secured and the vibrations are generated. Therefore, the high-magnification foam generators must be firmly mounted on buildings and structures.
4. Installation of foam nozzle
( 1 ) Installation requirements
1 The specification and model of the foam nozzle are closely related to the type of foam liquid used, the supply intensity and protection area of ​​the foam mixture, must not be misloaded and must meet the design requirements; and the foam nozzle installation must be tested and flushed in the system. Afterwards, because the nozzle diameter of the foam nozzle is small, the system pipeline is not washed cleanly, and the foreign material easily clogs the nozzle and affects the foam fire extinguishing effect.
(five) Installation of foam spray pipe
1. Installation requirements
( 1 ) The distance between foam spray pipe support, hanger and foam sprayer should not be less than 0.3m ; the distance from the end foam sprayer should not exceed 0.5m .
(2) each have a foam spray pipe branch pipe branched pipe section between two adjacent foam applicator, the hanger can not less than 1, and support, the spacing is not greater than 3.6m hanger; when the foam head When the setting height is greater than 10m , the spacing between the hangers and hangers shall not exceed 3.2m .
2. Detection method: check the size.
system debugging
The debugging of the foam fire extinguishing system is completed after the completion of the system construction and the technical parameters meet the design requirements. The system commissioning mainly includes the debugging of the various components of the system and the debugging of the system functions.
(a) system component debugging
1. Debug foam proportioner (apparatus)
( 1 ) Commissioning requirements
The adjustment of the foam ratio mixer ( device ) needs to be performed simultaneously with the system spray foam test, and the mixing ratio must meet the design requirements.
( 2