Method of fire testing of marine baffle

Abstract

The application discloses a fire resistance test method for a ship air distributor, and relates to the technical field of fire safety; steps include: experiment preparation, sample installation, experiment condition setting, flame contact test, heat radiation test, combustion performance evaluation, result analysis and report, the test method is formulated according to the ship air distributor, and the blank of the test method for the air distributor in the ship industry is filled; through the combustion performance evaluation step, the combustion of the air distributor sample under the flame contact and the fire resistance under the heat radiation are observed and recorded, and evaluation is carried out according to the evaluation standard, the fireproof performance of the air distributor can be effectively evaluated, and the fire safety of the air distributor when used on the ship is ensured; the air distributor is installed on the ceiling, and the combination of the air distributor and the ceiling forms a sample box body, the air distributor sample is compatible on the ship ceiling test device, the test environment is set, and the experimental result can be ensured to be closer to the actual application situation, so that the fire resistance test result of the ship air distributor is more accurate and reliable.

Description

Technical Field

[0001] This invention relates to the field of fire safety technology, specifically a fire resistance test method for marine air distributors. Background Technology

[0002] Marine air distributors are devices that distribute air from air conditioners into cabins, ensuring uniform mixing with indoor air and creating suitable airflow speeds. They are terminal devices in air conditioning and ventilation systems. Marine equipment can only be used on ships after obtaining a type approval certificate based on type testing. Currently, marine air distributors lack corresponding type testing standards, making it impossible to effectively evaluate their fire resistance performance and ensuring fire safety when used on ships, thus hindering their widespread application.

[0003] Currently, there is no type test method for air distributors in the shipbuilding industry. Therefore, by drawing on the test method for marine ceilings, we have conducted research and design on the fire resistance test method for marine air distributors and developed a test method suitable for marine air distributors. Summary of the Invention

[0004] The purpose of this invention is to provide a fire resistance test method for marine air distributors. By installing the air distributor on the ceiling and ensuring that its combination with the ceiling forms a sample box, the air distributor sample is compatible with the marine ceiling test device. By setting specific test environments and conditions, the test results are made closer to actual application conditions, making the fire resistance test results of marine air distributors more accurate and reliable.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] This application provides a fire resistance test method for marine air distributors, including the following steps:

[0007] S1: Experimental preparation, prepare the prototype marine air distributor as a sample, prepare experimental equipment and instruments and select appropriate experimental materials;

[0008] S2: Sample installation: The prototype air distributor is installed on the ceiling. The ceiling and the prototype air distributor are combined to form the air distributor sample box, so that the air distributor sample is compatible with the marine ceiling test device.

[0009] S3: Experimental conditions setting, setting the laboratory temperature and humidity to simulate the internal environment of a ship, setting the air flow and speed to simulate the normal working state of the air distributor;

[0010] S4: Flame contact test. Ignite the fire source and bring the flame into contact with the surface of the air distributor sample. Observe and record the combustion of the flame, the degree of combustion of the air distributor sample, and the development of the fire.

[0011] S5: Thermal radiation test. Place the thermal radiation meter at a standard distance from the marine air distributor and measure the thermal radiation intensity. Record and evaluate the fire resistance performance of the marine air distributor under thermal radiation.

[0012] S6: Combustion performance evaluation. When the test reaches the predetermined time, the test is stopped. The combustion performance of marine air distributors is evaluated by observing the combustion of the samples and the residue after combustion. The evaluation criteria include: B15 grade air distributors and B0 grade air distributors.

[0013] S7: Results Analysis and Reporting. Analyze the experimental results and determine whether the fire resistance performance of the marine air distributor meets the requirements.

[0014] Preferably, according to the installation of the air distributor as described in step S2, the installation method of the air distributor and the ceiling should be the actual application method. When installing the air distributor, the air outlet is located on the fire-facing side of the ceiling, and the air distributor housing is located on the fire-repellent side of the ceiling.

[0015] Preferably, the ceiling structure is composed of layers of 0.7mm thick galvanized steel sheet, 28.6mm thick rock slab, and 0.7mm thick galvanized steel sheet, wherein the density of the rock slab is 120kg / m³. 3 .

[0016] In this embodiment, the ceiling includes multiple air diffusers, the interval between adjacent air diffusers is greater than 200mm, and the distance between the air diffuser and the edge of the ceiling is greater than 200mm.

[0017] Preferably, five thermocouples are arranged at the center of the four quarter-areas on the back of the air distributor sample box as described in step S2 and at the center of the entire back to measure the average temperature rise of the air distributor. Thermocouples are also arranged at the center of the four sides of the box, offset by 100mm from the air inlet side, and at the surface of the ventilation pipe fitted at the air inlet, 25mm away from the box.

[0018] Preferably, the temperature and humidity settings for the test conditions are as follows: the temperature in the test chamber is controlled between 20°C and 40°C, and the humidity is controlled between 45% and 75%.

[0019] The flame temperature was controlled between 800℃ and 1000℃, and the test time was between 30 minutes and 120 minutes.

[0020] Preferably, according to the flame contact test described in step S4, an upright flame is selected to test the air distributor sample;

[0021] Among them, the upright flame refers to the flame form that burns vertically upwards, which is achieved by contacting the surface of the air distributor sample with the upright flame and maintaining it for the test time.

[0022] Preferably, in the thermal radiation test described in step S5, the thermal radiation meter is started and measured, the value of thermal radiation intensity is recorded, and the result is displayed as the thermal radiation power received per unit area. Multiple measurements of thermal radiation intensity are performed, and the average value is calculated.

[0023] Preferably, according to the evaluation criteria for marine air distributors described in step S6, wherein...

[0024] The evaluation criteria for B15 grade air distributors are as follows: the air distributor sample undergoes a standard fire resistance test for 30 minutes, with no flame penetration and intact structure; at the end of the 15th minute of the test, the average temperature of the unexposed surface of the air distributor sample increases by no more than 140°C from the initial temperature, and the temperature of any point on the unexposed surface of the air distributor sample increases by no more than 225°C from the initial temperature.

[0025] The evaluation criteria for a Class B0 air distributor are: the sample undergoes a standard fire resistance test for 30 minutes, with no flame penetration and the structure remains intact.

[0026] The beneficial effects of this invention are as follows:

[0027] (1) Applicable test methods were developed based on marine air distributors, filling the gap in the shipbuilding industry for type test methods of air distributors; then, through the combustion performance evaluation steps, the combustion of air distributor samples under flame contact and the fire resistance performance under heat radiation were observed and recorded, and the evaluation was carried out according to the evaluation standards, which can effectively evaluate the fire resistance performance of air distributors and ensure their fire safety when used on ships.

[0028] (2) In the air distributor installation step, the air distributor is installed on the ceiling and its combination with the ceiling forms a sample box, so that the air distributor sample is compatible with the marine ceiling test device. Setting the test environment can ensure that the test results are closer to the actual application situation, and make the fire resistance test results of the marine air distributor more accurate and reliable. Attached Figure Description

[0029] To better understand and implement this application, the technical solution is described in detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the fire resistance test method for marine air distributors provided in Embodiment 1 of this application;

[0031] Figure 2 This is one of the schematic diagrams of the marine air distributor and thermal coupler arrangement in the fire resistance test method for marine air distributors provided in Embodiment 1 of this application.

[0032] Figure 3This is the second schematic diagram of the arrangement of the marine air distributor and thermal coupler in the fire resistance test method for marine air distributors provided in Embodiment 1 of this application.

[0033] Figure 4 This is a schematic diagram showing the effect of the fire resistance test method for marine air distributors provided in Embodiment 1 of this application on the air distributor after the test. Detailed Implementation

[0034] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, exemplary embodiments will be described in detail below, examples of which are illustrated in the accompanying drawings. In the following description relating to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of methods and systems consistent with some aspects of this application as detailed in the appended claims.

[0035] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0036] The following detailed description of the specific implementation methods, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided in detail.

[0037] Example 1

[0038] Please see Figures 1-4 In this embodiment, the air distributor is installed on the ceiling, and its combination with the ceiling forms a sample box, so that the air distributor sample is compatible with the marine ceiling test device. By setting the test environment, the test results can be more closely related to the actual application situation, and the fire resistance test results of the marine air distributor can be more accurate and reliable.

[0039] This invention provides a fire resistance test method for marine air distributors, comprising the following steps:

[0040] S1: Experimental preparation. Prepare a prototype marine air distributor as a sample to ensure it meets design requirements and specifications. Prepare experimental equipment and instruments, such as ceiling panels and thermal radiation meters. Select appropriate test materials, such as ignition sources and combustibles, according to requirements.

[0041] S2: Sample installation: Based on the marine ceiling test sample, the prototype air distributor is installed on the ceiling. The ceiling and the prototype air distributor are combined to form the air distributor test sample box, so that the air distributor test sample is compatible with the marine ceiling test device.

[0042] S3: Experimental conditions setting: Set the laboratory temperature and humidity to simulate the internal environment of a ship, and set the air flow and speed to simulate the normal working state of the air distributor.

[0043] S4: Flame contact test. Ignite the fire source to produce a flame, and bring the flame into contact with the surface of the air distributor sample for a certain period of time. Observe the effect of the flame on the marine air distributor, and observe and record the combustion of the flame, the degree of combustion of the air distributor sample, and the development of the fire.

[0044] S5: Thermal radiation test. Place the thermal radiation meter at a certain standard distance from the marine air distributor and measure the thermal radiation intensity. Record and evaluate the fire resistance performance of the marine air distributor under thermal radiation according to standard requirements.

[0045] S6: Combustion performance evaluation. The test is stopped when the predetermined time is reached or the air distributor sample can no longer withstand the flame. The combustion performance of marine air distributors is evaluated, including parameters such as combustion rate and smoke density. The fire resistance performance is evaluated by observing the combustion of the sample and the residue after combustion. The evaluation standards include: B15 grade air distributors and B0 grade air distributors.

[0046] S7: Results Analysis and Reporting. Analyze the experimental results and determine whether the fire resistance performance of the marine air distributor meets the requirements.

[0047] In this embodiment, according to the installation of the air distributor described in step S2, the installation method of the air distributor and the ceiling should be the actual installation method used. When the air distributor is installed, the air outlet is located on the fire-facing side of the ceiling, and the air distributor housing is located on the fire-repellent side of the ceiling.

[0048] In this embodiment, the ceiling structure is composed of layers of 0.7mm thick galvanized steel sheet, 28.6mm thick rock slab, and another 0.7mm thick galvanized steel sheet, wherein the density of the rock slab is 120kg / m³. 3 .

[0049] This structure provides good fire resistance and durability, and is in line with the design structure of marine air distributors.

[0050] In this embodiment, the ceiling includes multiple air distributors, and the interval between adjacent air distributors should not be less than 200mm to ensure that adjacent air distributors do not affect each other; the distance between the air distributor and the edge of the ceiling should not be less than 200mm to ensure that the air distributor is not affected by additional heat flow from the edge of the sample.

[0051] In this embodiment, five thermocouples are arranged at the center of the four quarter-area areas and the center of the entire back of the air distributor sample box as described in step S2, to measure the average temperature rise of the air distributor. Thermocouples are also arranged at the center of the four sides of the box (the thermocouple on the air inlet side is offset by 100mm), and on the surface of the ventilation pipe fitted at the air inlet, 25mm from the box. All of these thermocouples are used to measure the maximum temperature rise of the air distributor.

[0052] By arranging and measuring thermocouples, a comprehensive understanding of the temperature changes of the air distributor sample during flame contact testing can be obtained, including the average temperature rise and the maximum temperature rise. This helps in evaluating the fire resistance and thermal protection capabilities of the air distributor.

[0053] The arrangement of the marine air distributor and thermal coupler is as follows: Figure 2 , Figure 3 As shown.

[0054] In this embodiment, the temperature and humidity settings of the test chamber are as follows: the temperature is controlled between 20°C and 40°C, and the humidity is controlled between 45% and 75% to simulate the internal environment of a ship.

[0055] The flame temperature was controlled between 800℃ and 1000℃, and the test time ranged from 30 minutes to 120 minutes.

[0056] Under 80 minutes (800℃) conditions, the air distributor sample exhibited good fire resistance under moderate high temperature conditions and could withstand flame contact at 800℃; the characteristics of the flue gas produced during combustion were relatively stable, and the release of harmful substances was relatively low; the residue of the air distributor sample was relatively uniform in morphology, with no obvious physical damage or carbonization.

[0057] Under 80 minutes (900℃) conditions, the air distributor sample exhibited strong fire resistance under high temperature conditions and could withstand flame contact at 900℃; the characteristics of the smoke generated during combustion were quite obvious, and it may release a certain amount of harmful substances; the residue of the air distributor sample did not show any physical damage or carbonization, and the overall structure remained intact.

[0058] Under 80 minutes (1000℃) conditions, the fire resistance of the air distributor sample is limited under extremely high temperature conditions and cannot withstand continuous flame contact at 1000℃; the characteristics of the smoke generated during combustion are relatively violent and may release a large amount of harmful substances; the residue of the air distributor sample does not show obvious physical damage or carbonization, and the structure may be severely damaged.

[0059] By setting the above test conditions, the temperature and humidity conditions inside the ship, as well as the temperature and test time of flame contact, can be simulated. This helps to evaluate the fire resistance and combustion characteristics of the air distributor samples under real-world usage conditions.

[0060] In this embodiment, according to the flame contact test described in step S4, different flame types can be selected, such as upright flames, jet flames, fan-shaped flames, etc. Different flame types have different thermal radiation and combustion characteristics. By testing the effects of different flame types on the air distributor sample, its fire resistance performance can be understood more comprehensively.

[0061] Among them, upright flame refers to a flame that burns vertically upward, such as a burning candle or open flame. By contacting the surface of the air distributor sample with an upright flame and maintaining it for the duration of the test, the fire resistance and heat resistance of the air distributor under real fire conditions can be evaluated.

[0062] Jet flame refers to a type of flame that burns at high speed, such as blowtorches and flame guns. By bringing the jet flame into contact with the surface of the air distributor sample and adjusting the temperature and pressure of the jet flame, fire conditions under certain special working conditions can be simulated, such as the situation where the jet flame directly impacts the air distributor.

[0063] A fan-shaped flame refers to a flame that is fan-shaped. It is achieved by adjusting the nozzle or other devices. A fan-shaped flame has a large area and a low height, which can simulate the uniform contact of the fire source on the surface of the air distributor. By contacting the fan-shaped flame with the air distributor sample and adjusting the flame size and temperature, the fire resistance performance of the air distributor under a wide range of flame contact can be evaluated.

[0064] The duration can be set to different flame contact times, such as short contact and long contact. Short contact can simulate the situation where the fire source is in short contact with the air distributor sample, while long contact can simulate the situation where the fire source is continuously acting. By testing flame contact of different durations, the fire resistance and durability of the air distributor sample can be evaluated.

[0065] Applying pressure can be done by inducing a certain amount of pressure during flame contact to simulate the mechanical stress that may exist in actual use environments. By conducting a flame contact test after applying pressure, the fire resistance and durability of the air distributor sample under stress can be evaluated.

[0066] Among them, the effects produced after testing the air distributor are as follows: Figure 4 As shown.

[0067] In this embodiment, according to the thermal radiation test described in step S5, a thermal radiation meter is activated and measurements are taken. The thermal radiation intensity is recorded. The thermal radiation meter typically measures in the form of thermal radiation and displays the result as the thermal radiation power received per unit area. Multiple thermal radiation intensity measurements are performed, and the average value is calculated to improve the reliability and accuracy of the results. This allows for a better evaluation of the fire resistance performance of the air distributor sample under thermal radiation.

[0068] In this embodiment, according to the evaluation criteria for marine air distributors described in step S6, wherein,

[0069] The evaluation criteria for B15 grade air distributors are as follows: the air distributor sample undergoes a standard fire resistance test for 30 minutes, with no flame penetration and intact structure; at the end of the 15th minute of the test, the average temperature of the unexposed surface of the air distributor sample increases by no more than 140°C from the initial temperature, and the temperature of any point on the unexposed surface of the air distributor sample increases by no more than 225°C from the initial temperature.

[0070] The evaluation criteria for a Class B0 air distributor are: the sample undergoes a standard fire resistance test for 30 minutes, with no flame penetration and the structure remains intact.

[0071] Example 2

[0072] This embodiment differs from Embodiment 1 by adding a flue gas emission test. Through the flue gas emission test, we can gain a more comprehensive understanding of the characteristics of the flue gas produced when the air distributor is burning and the release of harmful substances. This helps to assess the impact of the air distributor on the internal environment of the ship and the health of personnel in the event of a fire, and provides a scientific basis for relevant safety measures and emergency plans.

[0073] The flue gas emission test includes an assessment of the emissions from the combustion of the air distributor. By measuring the density and composition of the flue gas, the release of harmful substances produced during the combustion of the air distributor, and its impact on the ship's internal environment and personnel health, are evaluated.

[0074] Flue gas emission testing includes the following steps:

[0075] Sampling device preparation: Prepare a suitable flue gas sampling device, such as a flue gas sampling hood, adsorption tube, filter paper, etc., to ensure that the flue gas sample can be collected effectively.

[0076] By preparing appropriate flue gas sampling equipment, it is possible to effectively collect flue gas samples generated during combustion. This helps to obtain representative flue gas samples for subsequent analysis and evaluation.

[0077] The selection of flue gas sampling points depends on the experimental requirements. Flue gas sampling points are set at appropriate locations in the sample box of the air distributor. Usually, different locations such as the front, back and side of the air distributor can be selected for sampling in order to fully understand the characteristics of the flue gas.

[0078] During the flue gas sampling process, the flue gas is guided to the sampling point through the flue gas sampling device and sampled for a certain period of time. The sampling time should be determined according to the test requirements and relevant standards to ensure that representative flue gas samples are obtained.

[0079] By setting up flue gas sampling points at different locations, the characteristics of the flue gas produced during the combustion of the air distributor can be fully understood. Sampling from different positions such as the front, back, and sides of the air distributor can obtain more comprehensive and integrated flue gas information.

[0080] Flue gas density measurement involves using appropriate flue gas density measuring instruments, such as optical sensors or particle counters, to measure the sampled flue gas. These instruments can assess the density of flue gas by measuring the number or concentration of particles in the flue gas.

[0081] The sampled flue gas is measured using appropriate flue gas density measuring instruments, such as optical sensors or particle counters. This provides an accurate measurement of flue gas density, allowing for an assessment of the flue gas concentration and its distribution.

[0082] Flue gas composition analysis: The collected flue gas samples are sent to the laboratory and the flue gas composition is analyzed using instruments such as gas chromatography-mass spectrometry. By analyzing the types and contents of harmful substances in the flue gas, the release of harmful substances produced during the combustion of the air distributor can be assessed.

[0083] By sending collected flue gas samples to the laboratory and analyzing their components using instruments such as gas chromatography-mass spectrometry, the types and amounts of harmful substances in the flue gas can be accurately determined. This helps in assessing the release of harmful substances generated during the combustion of the air distributor.

[0084] Data processing and evaluation: Based on the results of flue gas density measurement and flue gas composition analysis, data processing and statistical analysis are performed to evaluate the characteristics of flue gas generated during the combustion of the air distributor, the release of harmful substances, and the potential impact on the internal environment of the ship and the health of personnel.

[0085] By processing and statistically analyzing the results of flue gas density measurements and flue gas composition analysis, the characteristics of the flue gas generated during the combustion of the air distributor and the release of harmful substances can be comprehensively assessed. This helps to understand the potential impact of flue gas on the internal environment of the ship and the health of personnel, and provides a scientific basis for relevant safety measures and emergency plans.

[0086] In flue gas emission testing, appropriate instruments and equipment can be used to measure flue gas density and composition. Flue gas density can be measured using devices such as optical sensors or particle counters to assess the concentration and distribution of flue gas. Simultaneously, flue gas samples can be collected and analyzed using instruments such as gas chromatography-mass spectrometry to determine the types and amounts of harmful substances.

[0087] Example 3

[0088] In this embodiment, the fire resistance performance is evaluated by observing the combustion of the sample and analyzing the residue after combustion.

[0089] Analysis of post-combustion residues includes the following steps:

[0090] Residue collection: After the test, the residue of the burnt-out air distributor sample should be collected. Tools, brushes, etc. can be used to collect the residue into a container.

[0091] By collecting the residue samples from the burnt-out air distributor, we can obtain residue samples generated during the actual combustion process, providing a basis for subsequent analysis and evaluation.

[0092] Observe the appearance characteristics of the residue, including color, shape, texture, etc. These appearance characteristics can initially reflect the thermal decomposition, carbonization and other possible reactions that occur during the combustion of the air distributor.

[0093] Physical property testing involves conducting basic physical property tests on the residue, such as measuring its density, hardness, and strength, to understand its physical characteristics and structural changes.

[0094] By testing the physical properties of the residue, such as density, hardness, and strength, we can gain a deeper understanding of its physical characteristics and structural changes. This helps in assessing the fire resistance of the air distributor during a fire and the stability of the residue after combustion.

[0095] Chemical composition analysis involves using appropriate chemical analysis methods to analyze the chemical composition of the residue. Common analytical techniques include infrared spectroscopy, elemental analysis, and mass spectrometry. These analyses can determine the organic and inorganic components in the residue and provide insights into the composition of the gaseous and solid products generated during combustion.

[0096] Chemical analysis of the residues allows for the identification of their organic and inorganic components. This helps in understanding the chemical composition of the gaseous and solid products generated during combustion, thereby assessing the characteristics of the air distributor's combustion products and the potential release of hazardous substances.

[0097] Hazardous substance detection, with particular attention to potentially hazardous substances in the residues, assesses the release of hazardous substances during the combustion of the air distributor and its potential impact on the ship's internal environment and personnel health through the detection and analysis of toxic and hazardous substances.

[0098] Detection and analysis of potentially hazardous substances in the residues help assess their potential impact on the ship's internal environment and personnel health, and provide a basis for relevant safety measures.

[0099] Results analysis and assessment: Based on the observation and analysis results, a comprehensive assessment is conducted on the characteristics, chemical composition, and hazardous substances of the residues. These assessments can help determine the combustion products generated by the air distributor during a fire and evaluate the impact on the ship's internal cleaning and restoration work.

[0100] A comprehensive evaluation of the observations and analysis results can determine the characteristics and impact of the combustion products generated by the air distributor during a fire. This helps assess the impact on the ship's interior cleaning and recovery efforts and provides reference information for improving air distributor design and selecting safer and more reliable materials.

[0101] By analyzing the combustion residues through the above steps, we can gain a comprehensive understanding of the characteristics and composition of the residues produced by the air distributor during combustion, as well as their potential impact on the ship's internal environment and personnel health. This helps to assess the fire resistance of the air distributor and the safety of the combustion products, providing the shipbuilding industry with more reliable fire safety measures.

[0102] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A fire resistance test method for marine air distributors, characterized in that: Includes the following steps: S1: Experimental preparation, prepare the prototype marine air distributor as a sample, prepare experimental equipment and instruments and select appropriate experimental materials; S2: Sample installation: The prototype air distributor is installed on the ceiling. The ceiling and the prototype air distributor are combined to form the air distributor sample box, so that the air distributor sample is compatible with the marine ceiling test device. S3: Experimental conditions setting, setting the laboratory temperature and humidity to simulate the internal environment of a ship, setting the air flow and speed to simulate the normal working state of the air distributor; S4: Flame contact test. Ignite the fire source and bring the flame into contact with the surface of the air distributor sample. Observe and record the combustion of the flame, the degree of combustion of the air distributor sample, and the development of the fire. S5: Thermal radiation test. Place the thermal radiation meter at a standard distance from the marine air distributor and measure the thermal radiation intensity. Record and evaluate the fire resistance performance of the marine air distributor under thermal radiation. S6: Combustion performance evaluation. When the test reaches the predetermined time, the test is stopped. The combustion performance of marine air distributors is evaluated by observing the combustion of the samples and the residue after combustion. The evaluation criteria include: B15 grade air distributors and B0 grade air distributors. S7: Results Analysis and Reporting. Analyze the experimental results and determine whether the fire resistance performance of the marine air distributor meets the requirements.

2. The fire resistance test method for marine air distributors according to claim 1, characterized in that: According to the installation of the air distributor as described in step S2, the installation method of the air distributor and the ceiling should be the actual application method. When installing the air distributor, the air outlet is located on the fire-facing side of the ceiling, and the air distributor housing is located on the fire-repellent side of the ceiling.

3. The fire resistance test method for marine air distributors according to claim 2, characterized in that: The ceiling structure is composed of layers of 0.7mm thick galvanized steel sheet, 28.6mm thick rock slab, and 0.7mm thick galvanized steel sheet, wherein the density of the rock slab is 120kg / m³. 3 .

4. The fire resistance test method for marine air distributors according to claim 3, characterized in that: The ceiling includes multiple air distributors, with a spacing of more than 200mm between adjacent air distributors and a distance of more than 200mm between the air distributors and the edge of the ceiling.

5. The fire resistance test method for marine air distributors according to claim 1, characterized in that: According to step S2, five thermocouples are arranged at the center of the four 1 / 4 areas on the back of the air distributor sample box and at the center of the entire back to measure the average temperature rise of the air distributor. Thermocouples are also arranged at the center of the four sides of the box and on the surface of the ventilation pipe fitted at the air inlet, 25mm away from the box. If the air inlet is set on the side of the box, the thermocouple position is offset by 100mm from the center of the side of the box.

6. The fire resistance test method for marine air distributors according to claim 1, characterized in that: The test conditions were set with the temperature and humidity controlled between 20°C and 40°C and between 45% and 75% in the test chamber. The flame temperature was controlled at 800℃ to 1000℃, and the test time was 30 minutes to 120 minutes.

7. The fire resistance test method for marine air distributors according to claim 1, characterized in that: According to the flame contact test described in step S4, an upright flame is selected to test the air distributor sample; Among them, the upright flame refers to the flame form that burns vertically upwards, which is achieved by contacting the surface of the air distributor sample with the upright flame and maintaining it for the test time.

8. The fire resistance test method for marine air distributors according to claim 1, characterized in that: According to the thermal radiation test described in step S5, the thermal radiation meter is started and measured, the value of thermal radiation intensity is recorded, and the result is displayed as the thermal radiation power received per unit area. Multiple thermal radiation intensity measurements are performed, and the average value is calculated.

9. The fire resistance test method for marine air distributors according to claim 1, characterized in that: According to the evaluation criteria for marine air distributors described in step S6, wherein... The evaluation criteria for B15 grade air distributors are as follows: the air distributor sample undergoes a standard fire resistance test for 30 minutes, with no flame penetration and intact structure; at the end of the 15th minute of the test, the average temperature of the unexposed surface of the air distributor sample increases by no more than 140°C from the initial temperature, and the temperature of any point on the unexposed surface of the air distributor sample increases by no more than 225°C from the initial temperature. The evaluation criteria for a Class B0 air distributor are: the sample undergoes a standard fire resistance test for 30 minutes, with no flame penetration and the structure remains intact.

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