The spray system is available
Fire pump room, stairwell, elevator front room, basement, roof
Waiting for key inspection sites and
Test water testing at the end; pipeline bracket, hanging frame, anti -shaking stent settings
What are the common quality concerns for quality attention points? And how can we control?
Common problem 1
The installation position of the water flow indicator of the water pipe spraying water pipe automatic water spraying system does not meet the requirements.
Causes and consequences:
Can’t meet the functional requirements or cause mistakes.
Control measures and relevant regulations:
The water current indicator should be installed above 1.8m from the ground. The installation of the water current indicator should be at least 15cm from the elbow and at least 60cm from the valve. The pipeline openings should be used to use a dedicated tool to ensure that the opening is on the vertical line of the pipeline and clean the pipe.
Common problem 2
The signal valve of the automatic water spray fire extinguishing system is installed behind the water current indicator, and the connection is directly connected to each other
The signal valve is not sensitive, or even the water flow in the tube cannot be displayed, and it is transmitted to the fire system command center.
The signal valve should be installed on the pipeline in front of the water current indicator, and the distance between the two should not be less than 30cm.
Common problem 3
The automatic water spray fire extinguishing system uses a non -galvanized steel pipe or a connected spraying header pipe with a galvanized steel pipe with a diameter of less than 25mm
The rust in the welding steel pipe or seamless steel pipe can cause the spray head to block, lose the function of automatic water injection and fire, and increase fire loss.
The automatic water -spraying fire extinguishing system must use galvanized steel pipes and connect the spraying headpower pipe diameter must not be less than 25mm.
Common problem 4
Below the wet alarm valve and the water flow indicator come to the direction of the water without the signal valve and install the ordinary valve
Turn off the valve when repairing the pipeline. After the repair, due to the forgotten to open, there is no water in the fire pipeline, causing major losses.
The signal valve must be installed under the alarm valve and the water flow indicator to the water direction. And check whether the signal when the signal valve is opened or closed is returned to the fire control center. In order to prevent errors, the valve is also locked to prevent the valve from accidentally closed.
Common problem 5
The water outlet pipe (constant pressure pipe) or automatic water spray fire extinguishing system of the water spray fire extinguishing system of the fire water spraying system of the fire water spraying system of the roof water tank is not installed with a filtering device
The water tank or the debris in the pool enters the pipe network, causing a closed -type spray head to block or the alarm bell or the pressure switch in the alarm valve fails, affecting the fire and fire extinguishing and the alarm work.
The device exit of pressure and replenishment of automatic water -spraying system. Setting filtration facilities should be set.
Common problem 6
The number of pipe diameters is not matched with the number of spray heads
Failure to be constructed according to the design drawings, changes or spray heads during the decoration phase, and can not achieve the effect of automatic water spray fire extinguishing.
For secondary design according to the decoration drawings and requirements, the construction shall be constructed in accordance with the requirements of design specifications.
(1) The standard nozzles controlled by each sides of the water pipes on both sides of the water pipe should not exceed 8 light risk and medium -risk places. At the same time, the water supporting tube of the nozzle head on the ceiling should not exceed 8. The serious danger level and warehouse dangerous places should not exceed 6.
(2) The standard nozzles of water supporting pipes and water -assigned pipe controls in light danger levels and mid -dangerous places shall not exceed the provisions of Table 51.
Light -dangerous, medium -dangerous places with standard nozzles for water support and water pipe control
Table 5 1 1
Common problem 7
The distance of the spray head position, height, and the distance from the block does not meet the requirements
Due to changes in the decoration and room size and use, the position of the spray head is relatively changed, resulting in the spraying head spraying area of the spray head cannot meet the design specifications and reduce the effect of automatic water spray fire extinguishing.
Prevention and control measures and relevant regulations: “Design Specifications for Automatic Water Spitfire and Extermination System” GB50084 One 2001 (2005 Edition) Regulations:
(1) Except for the sprinkler of the top and under the ceiling, the standard nozzle of the upright and drooping type is not less than 75mm or more than 150mm.
(2) When the nozzle is arranged on the plane below the bottom surface of the beam or other obstacles, the distance between the splash plate and the top board should not be greater than 300mm. At the same time It should be greater than 100mm.
(3) When arranging at the beam, it shall comply with the provisions of Article 7.2.1 of this specification. When it is difficult, the distance between the splash and the top board should not be greater than 550mm. When the spray head between the beam, the splash of the spray head and the top board reaches 550mm, and it should not meet the provisions of Article 7.2.1, and the nozzle should be added below the bottom of the beam. The spray head under the dense rib beam, the vertical distance between the water splash plate and the bottom surface of the dense ribbing plate should not be less than 251nm, and should not be greater than 100mm.
(4) In place where the net air height does not exceed 8M, the cross -beams that are not arranged by 4×4 (m) can be arranged between the beams, but the water spray intensity should still meet the requirements of Table 5.0.1.
(5) The nozzle should be arranged under the top panel or ceiling that is easy to contact the fire thermal airflow and is beneficial to the position of evenly. When there are obstacles near the nozzle, the nozzle head with the distance between the nozzle and the obstacles should be compliant.
(6) When there are combustibles in the dumplings and technical expansion of the net air height greater than 800mm, a nozzle should be set.
(7) When the automatic water -spraying fire extinguishing system is set up in the local area, a nozzle should be provided with the annex or the outer side of the opening of an automatic water spray fire extinguishing system.
(8) The place where the transparent ceiling is installed, and the nozzle should be arranged under the top board.
(9) When the width of obstacles such as beams, ventilation pipelines, rowing pipelines, and bridges is greater than 1.2m, a nozzle should be added below it. If there is a gap above the sprinkler, a hot plate should be set when there is a gap.
(10) The spatter plate of the upright side wall type, the distance between the spatter plate and the top board should not be less than 100mm, and should not be greater than 150mm. The distance from the back wall should not be less than 50mm, and it should not be greater than 100mm. The distance between the horizontal side wall spray head splash and the top board should not be less than 150mm and should not be greater than 300mm.
Common problem 8
Automatic water spray fire extinguishing system directly leads to the connection to the sprinkler support on the sanitary pipe
The amount of water led directly exceeds the design water volume, resulting in the design requirements of other nozzles, which affects the overall fire extinguishing effect.
The nozzle should be reasonably distributed in accordance with the design requirements, and the connection position of the nozzle cannot be changed at will.
Nature 9
Automatic water spray fire extinguishing system Pipelines use pipe supplements or live joints are incorrect
Pipes are prone to leakage and damage, affecting normal fire fighting work.
When the pipeline variable diameter is transformed, a different diameter connector should be adopted, and the pipe supplementary core shall not be used at the elbow of the pipeline. When the pipe supplementary core needs to be used, 1 can be used in the three links, and the four -way can not exceed 2. It is not appropriate to use live connectors.
Top 10
The valve between the wet alarm valve and the delayer switch the alarm bell, or the installation of the connection rod of the alarm bell is not flexible
When the fire alarm valve is opened, the pipeline of the alarm bell does not run through the police bell, which causes the alarm bell to not move. The delayer switch cannot call the police to the fire center to delay fire fighting.
The valve between the wet alarm valve and the delayer switch the alarm bell must be opened, and the connection rod with the alarm bell must be ensured.
Nature 11
The type and settings of the anti -shaking stent do not meet the requirements
Shaking refers to shaking back and forth or swinging up and down, especially refers to repeated and rapidly shaking. The main purpose of setting anti -shaking brackets is to ensure the strength of the pipe network, so that it does not cause damage when it is hit by external mechanical collision and its own hydraulic impact. At the same time, it emphasizes that its installation position must not hinder the spray of water spraying and affect the fire extinguishing effect.
The spray level and end branch pipes are adopted with anti -shaking brackets, which can make the pipeline firm and reliable and prevent errors from turning to reverse. The main thing is that the level of smallpox spans is very beneficial. The phenomenon of decoration is caused by unstable suspension.
(1) In order to prevent the pipeline shaking along the pipeline when the nozzle is sprayed, the anti -shake bracket should be set at the following parts:
1) The midpoint of the water pipe (when the size of the nominal nominal size is less than 50mm), it is not set)
2) The length of the water stem pipe and the water distribution pipe and the water supporting pipe exceeds the clever rice (including the water distribution pipe and water supporting tube with a diameter of 50mm), at least one in the length of 15 meters;
3) When the pipeline changes direction, the anti -shaking support should be added.
(2) The intensity of anti -shaking brackets should be able to withstand the weight of the pipeline, accessories and water in the pipe and the promotion force of the level of 50 % of the level without damage or permanent deformation.
Generally in actual construction, it is recommended to set up the dragon door frame at the end of the spray pipe or in accordance with regulations to replace the anti -shaking bracket. It is made of corner steel or slot steel. The U -shaped tube card is fixed. The axial movement (displacement) of the pipeline is limited.
Common problem 12
Incorrect installation of the pipeline bracket, hanging frame, and anti -shaking bracket
The pipeline is damaged during the collision of external mechanical and its own hydraulic impact. At the same time, the wrong installation position will prevent the nozzle of water spraying fire and fire extinguishing effect.
(1) The pipeline should be fixed and firm; the distance between the pipeline branches and the suspension shall meet the specifications.
(2) The installation position of the pipeline bracket and hanging rack should not hinder the spraying effect of the nozzle: the distance between the pipeline bracket, the suspension frame and the nozzle should not be less than 300mm; the distance between the end of the end should not be greater than 750mm.
(3) The suspension racks set up between the pipe sections between the pipe sections and the adjacent sprinkler should not be less than one, and the spacing of the suspension rack should not be greater than 3.6m.
(4) When the nominal diameter of the pipeline is equal to or greater than 50mm, each section of the water stem pipe or water distribution pipe should not be less than 1, and the spacing of the anti -shaking bracket should not be greater than the ingenious m; when the pipeline changes the direction, when the pipeline changes direction, when the pipeline changes direction, when the pipeline changes direction, the direction of the pipeline is changed. Anti -shaking bracket should be added.
The distance table between the pipeline bracket or suspension
5 1 2
Through problem 13
The decoration engineering ceiling does not have a component layout, and the installation of the spray head is not coordinated with the ceiling layout diagram
The ceiling head of the aisle is not on a line, and the size of the roof is inconsistent. It seriously affects the quality of the overall building decoration.
The arrangement of the spray head is arranged according to the professional design drawings and the ceiling plane layout, so that the spray head installation of the spray head on the ceiling of the straight aisle must be arranged into a straight line. , And match the lamp, speakers, and air outlets on the ceiling. The installation of the spray head in the room should be arranged consistent. The installation position of the spray head cannot be installed on the keel with the ceiling grid line. The size of the shallow water plate of each spray head must be consistent. At the same time, the position of the spray head is the size of the top of the top and the position of the spraying head distance beam.
Nothing problem 14
The setting of the end water testing device is unreasonable
(1) Improper setting of the water testing device at the end. However, in order to facilitate use, the construction unit requires the construction unit to set the end -end water testing device in the toilet to facilitate drainage without setting up the most unfavorable point. The drainage facilities at the device at the device are less than the amount of water leaking valve from the test valve or simply without drainage facilities. After the test valve is turned on, it will cause a “flood”. Water release test; some construction units are placed in the ceiling of the end -end testing device in the ceiling of the corridor, room or toilet, which is extremely inconvenient to test water;
(2) Do not use the prescribed end water testing device, and use DN25’s ball valve instead of 25mm, which is much larger than a nozzle with a nominal diameter of 15mm (the actual pore diameter is about 11mm). The water flow is far greater than the drainage volume of a standard nozzle. Obviously, such a water test device cannot represent the effect of a sprinkler.
(1) According to Article 6.5.1 of the “Design Specification of Automatic Water Spitfire System”, the end -end water testing device shall be set at the most unfavorable point and should have sufficient drainage capacity. The most unfavorable point of the longest pipeline can be determined at the end of the drawing and construction.
(2) The DN15 ball valve is adopted. The water testing device at the end must be equivalent to the flow of a nozzle head in the fireproof partition, so that the test results can meet the test purpose.
The “Design Specification of Automatic Water Spitfire System” GBS0084 1 2001 (2005 version) clearly stipulates that the end water testing device should be composed of water test valves, pressure gauges and water test connections. The flow coefficient of the water outlet out of the water outlet should be equivalent to the minimum flow coefficient nozzle in the same floor or fireproof partition. The water outlet of the end water testing device should be discharged into the drainage pipes when the pore outflow should be used.
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