Some standard content:
National Standard of the People's Republic of China
Test methods for smoke fire dampers
Test methods for smoke fire dampers1 Subject content and scope of application
GB15931-1995
This standard specifies the performance test items, test piece requirements, test equipment, test procedures and judgment conditions of smoke fire dampers. This standard applies to the performance test of smoke fire dampers installed in the smoke exhaust system of civil and industrial buildings (including underground projects). 2 Reference standards
GB/T2624 Flow measurement throttling device Measuring the flow of fluids filling a circular tube with orifice plates, nozzles and venturi tubes GB9978 Fire resistance test methods for building components
3 Terminology
Smoke fire damper: Installed on the smoke exhaust system pipeline, usually in an open state, and automatically closed when the gas temperature in the pipeline reaches 280℃ during a fire. A valve that can meet the requirements of fire resistance stability and fire resistance integrity within a certain period of time and acts as a smoke and fire barrier. 4 Test items
This standard includes the following five tests:
Thermostatic sensor performance test;
Closing reliability test;
Salt spray test,
Air leakage test;
Fire resistance test.
Each smoke exhaust fire damper (hereinafter referred to as the test piece) to be tested shall be tested item by item according to the above items. 5 Test piece requirements
5.1 Materials
The material selection and manufacturing type of the test piece shall be the same as the actual use. 5.2 Installation
The installation of the test piece shall reflect its actual use. For the test piece to be tested, it shall be installed on the outside of the test furnace, and the test furnace shall be connected to the test furnace through the vertical partition member through the front connecting pipe of the test piece. The test partition member shall be consistent with the actual use. When it cannot be determined, concrete or brick structure with a density of not less than 450kg/m2 can be selected. The thickness of the partition member shall not be less than 100mm. When making the partition components, routine maintenance and drying treatment should be carried out. 6 Test equipment
6.1 Constant temperature oil bath
Approved by the State Administration of Technical Supervision on December 20, 1995, and implemented on June 1, 1996
GB 15931-1995
A set of oil baths that can fully immerse the temperature sensing element and have a heater, as well as control and measuring instruments that can control the temperature fluctuation in the horizontal and vertical directions within the range of ±0.5℃. The accuracy of the instrument for measuring the oil temperature should not be less than ±0.5℃. 6.2 Salt spray box or salt spray chamber
Capable of controlling the air temperature at 35 ±2℃. Salt spray box or salt spray chamber with a relative temperature greater than 95%; equipped with a nozzle and air compressor with a mist drop of 1 to 2mL/(h·80cm), a mist particle diameter of 1 to 5μm accounting for more than 85%, and a pressure of 0.08 to 0.14MPa, as well as an instrument measurement system. wwW.bzxz.Net
The measuring instruments shall have the following accuracy: Temperature: ±0.5℃
Humidity: ±2%
Acidity: 0.1pH
6.3 Gas flow measurement device
The gas flow measurement device consists of a connecting pipe, a gas flow meter and an induced draft fan system. The connecting pipe shall be made of a steel plate with a thickness of not less than 1.6mm. The cross section of the pipe shall be consistent with the size of the test piece. The length of the pipe shall be twice the diagonal of the cross section of the pipe, and the maximum length shall not exceed 2m.
The gas flow meter shall adopt a standard orifice plate. The processing, manufacturing and installation of the orifice plate shall comply with the provisions of GB/T2624 standard. The induced draft fan system shall include an induced draft fan, an air inlet valve, a regulating valve and a flexible pipe connecting the gas flow meter and the induced draft fan. 6.4 Pressure measurement and control system
The pressure measurement system includes a pressure sensor, a pressure outlet, a sealed connecting pipe, etc. The pressure is controlled by the pressure sensor to adjust the air inlet valve and regulating valve in the induced draft fan system.
Accuracy of gas flow and pressure measuring instruments: Temperature: ±2.5℃
Pressure: ±5Pa
Flow rate: ±2.5%
6.5 Fire-resistant test furnace
The fire-resistant test furnace can meet the requirements of Article 2.1 of GB9978 and the heating conditions specified in Article 3.1. 10 minutes after the start of the test, the furnace should maintain a pressure of 15±5Pa on the horizontal center line of the installed test piece. 6.6 Temperature measurement system
The temperature measurement in the furnace should comply with the provisions of Article 2.3.1 of GB9978, and the number of thermocouples shall not be less than five. The temperature of the gas in the pipeline is measured by a thermocouple with a delay time of no more than 5s. The measuring point is located on the center line of the measuring tube at the rear end of the orifice plate, and the distance from the orifice plate is twice the diameter of the measuring pipe. Accuracy of measuring instrument:
Temperature: furnace temperature ±15℃
Other ±5℃
Pressure: ±5Pa
Time: ±10s
7 Test method and judgment conditions
7.1 Temperature sensor action performance test
7.1.1 Test steps
Install the temperature sensor on the core rod of the temperature sensor. When the oil bath temperature is heated to 260±2℃, constant temperature control is performed. Put the temperature sensor into the oil bath so that the temperature sensor is completely immersed. After 5 minutes, observe whether the temperature sensor is activated. Then take out the core rod and cool it. Control the oil bath temperature to rise to 285±2℃ and keep constant temperature. Put the temperature sensor into the oil bath so that the temperature sensor is completely immersed. Record the time for the temperature sensor to 60
act.
7.1.2 Judgment conditions
GB15931—1995
The temperature sensor is qualified if it does not operate for 5 minutes at an oil temperature of 260±2℃ and operates within 1 minute at an oil temperature of 285±2℃. 7.2 Closing reliability performance test
7.2.1 Test steps
Fix the test piece on the test bench, open the valve, and start the operating mechanism to close the test piece. Repeat this operation 250 times. For test pieces with several different starting methods, the 250 operations should be evenly distributed. 7.2.2 Judgment conditions
During the 250 closing operations, the test piece should be able to close flexibly and reliably from the open position, and each component should have no obvious wear, deformation, or other damage that affects its sealing performance.
7.3 Salt spray test
7.3.1 Test steps
Before the test, the test piece must be cleaned and the grease on the surface of the test piece must be washed off. The test piece must be placed in the salt spray box (chamber) with the test piece opening facing upward and the axis of the valve plate at an angle of 15°~30° to the horizontal plane. The distance between the test pieces must not be less than 20mm. The salt water solution is prepared from chemically pure sodium fluoride and distilled water, with a weight concentration of 5% and a pH value controlled between 6.5 and 7.2. During the test, the test piece is in an open state. When spraying, the salt spray cannot be sprayed directly on the test piece, but on a baffle at a certain distance from the nozzle, so that the larger droplets settle and flow back to the storage box, and the finer droplets diffuse into the salt spray box (chamber) with the gas. The condensed salt water on the top of the box (chamber) must not drip on the test piece, and the salt water flowing down from the four walls of the equipment must not be reused. The spray method adopts continuous spraying for 8 hours, then stop spraying for 16 hours, 24 hours as a cycle, and a total of five cycles. When the spraying is stopped, no heating is performed, and the salt spray box (chamber) is closed to allow it to cool naturally. After the test, take out the test piece, rinse the salt water deposited on the surface of the test piece with running cold water, and dry it at room temperature for not less than 24 hours.
7.3.2 Judgment conditions
The test piece is tested for closing, and the test piece should still be able to be closed flexibly and reliably from the open position. 7.4 Air leakage test
7.4.1 Test steps
At the beginning of the test, the test piece is in a closed state and its inlet is sealed. Start the induced draft fan, adjust the air inlet valve and the regulating valve so that the gas pressure difference before and after the test piece is 300Pa. After stabilization for 60s, measure and record the differential pressure on both sides of the orifice plate, the gas pressure before the orifice plate, and the gas temperature in the measuring tube after the orifice plate. Calculate the gas flow rate in this state according to the calculation formula in GB/T2624 standard. This flow rate is the system air leakage. At the same time, measure and record the atmospheric pressure at the time of the test. Remove the seal at the entrance of the test piece. The test piece is still in a closed state. The gas pressure difference before and after the test piece is still maintained at 300Pa. After stabilizing for 60s, measure and record the differential pressure on both sides of the orifice plate, the gas pressure before the orifice plate, and the gas temperature in the measuring tube after the orifice plate. Calculate the gas flow rate in this state according to the calculation formula in GB/T2624 standard. This flow rate is the air leakage of the whole test piece. At the same time, measure and record the atmospheric pressure at the time of the test.
The air leakage of the test piece at ambient temperature (standard state) is calculated by the following formula: Q = Qb2 — Qb1
Qb2 = Q: × 273+ T, ×
X101325
Qb1 = Q1× 2734T
×101325
Where: Q is the air leakage of the test piece at ambient temperature (standard state), Nm/h;(1)
·(2)
(3)
GB15931—1995
Air leakage of the whole machine of the test piece at ambient temperature (standard state), Nm2/h; Q mark 2—
Q. Air leakage of the whole machine of the test piece measured according to this article, m\/h; P2—Pressure in front of the orifice plate when the whole machine leakage of the test piece is measured, Pa; T
Q mark 1—
When the whole machine leakage of the test piece is measured Gas temperature in the duct, ℃; atmospheric pressure at the time of the actual test piece leakage, Pa; - system leakage at ambient temperature (standard state), Nm2/h; Q
actual system leakage, m/h;
Pl—gas pressure in front of the orifice plate when the actual system leakage is measured, Pa; Ti-
measure the gas temperature in the duct when the actual system leakage is measured, ℃; atmospheric pressure at the time of the actual system leakage, Pa. 7.4.2 Judgment conditions
The test piece is qualified if the unit area leakage (standard state) is not greater than 700Nm2/(h·m2). 7.5 Fire resistance test
7.5.1 Test steps
During the test, the test piece is in the open state. First, start the induced draft fan, adjust the air inlet valve and the regulating valve, so that the air flow flows steadily through the test piece at a speed of 0.15m/s.
The test furnace is ignited. When the center temperature of the fire-receiving surface of the test piece reaches 50℃, the test starts. The temperature rise of the fire-receiving surface of the test piece is controlled to reach the temperature rise condition of Article 3.1 of GB9978.
Record the closing time of the test piece. After the test piece is closed, adjust the induced draft fan system to keep the gas pressure difference before and after the test piece within the range of 300±15Pa.
10 minutes after the start of the test, control the furnace pressure within the range of 15±5Pa. Before measuring, record the differential pressure on both sides of the orifice plate, the gas pressure before the orifice plate, and the gas temperature in the measuring tube after the orifice plate. The time interval is not more than 2 minutes. Calculate the gas flow rate of the orifice plate at each time according to the calculation formula in GB/T2624 standard. Measure and record the atmospheric pressure during the test. During the fire test, the air leakage of the specimen (standard state) is calculated using the following formula: Q = Qb3 -Qb1
Qb3 = Q × 273T,
B— P
K101325
Wherein: Q - air leakage of the specimen during the fire test (standard state), Nm/h; - air leakage of the entire specimen during the fire test (standard state), Nm/h; Qb3
Q: - measured air leakage of the entire specimen at each moment of the fire test, m /h; P: gas pressure in front of the orifice at each time during the fire test, Pa; T: gas temperature in the measured pipe behind the orifice at each time during the fire test, ℃; B: atmospheric pressure during the fire test, Pa; Q: mark 1 - system air leakage (standard state) calculated according to formula (3) in 7.4.1, Nm2/h7.5.2 Judgment conditions
When any of the following conditions occurs during the test, it indicates that the test piece has lost its fire resistance: the test piece cannot be closed automatically within 2 minutes after the start of the test; a.
The air leakage per unit area of the test piece (standard state) is greater than 1000Nm/(h·m2). bi
8 Test report
The test report shall include the following contents:
(4)
Name of the test entrusting organization;
Name of the manufacturer and the model and specification of the test piece; form of sample delivery;
Standard number;
Test date;
GB15931
Structural diagram, materials used, technical data, installation and other relevant instructions of the test piece; test data;
Observation record;
Test conclusion;
Signature of the test host and the person in charge of the test unit, and seal of the test unit. Additional notes:
This standard was proposed by the Ministry of Public Security of the People's Republic of China. This standard is under the jurisdiction of the National Fire Protection Standardization Technical Committee. This standard was drafted by the Tianjin Fire Science Research Institute of the Ministry of Public Security and the China Academy of Building Research. Yangzhou Qida Fire Protection Equipment Factory, Yangzhou Huazhen Electronic Fire Protection Equipment Factory and Jiangsu Jingjiang Yangzi Fire Protection Equipment Factory participated in the preparation. 63
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