A test method for fire resistance performance of pipeline thermal insulation and fireproofing materials

Abstract

The present invention discloses a fire resistance performance test method for pipeline thermal insulation fireproof materials, comprising the following steps: step 1, modeling experiment; step 2, establishing a finite element model; step 3, finite element model auxiliary calculation; step 4, verification experiment: conducting a verification experiment on the fire protection system calculated and designed in step 3 to verify the calculation result; step 5, applying the qualified finite element model in step 4 to design a fire protection system for different fire protection objects under the same working conditions. The present invention can use a safe medium to conduct experiments and establish a finite element model, and then replace the physical property parameters of the target medium in the model for design calculation.

Description

Technical Field

[0001] The invention relates to the technical field of fire resistance testing, and in particular to a method for testing the fire resistance performance of pipeline thermal insulation and fireproofing materials. Background Art

[0002] As the requirements for fire safety in the petroleum, natural gas, and chemical industries continue to increase, passive fire protection (fire resistance) systems are increasingly being used in these industries. For example, the petrochemical industry standard SHT3005-2016 "Petrochemical Automation Instrument Selection and Design Specifications" puts forward requirements for the fire resistance time limit of valve actuators under hydrocarbon fires; SHT 3210-2020 "Petrochemical Equipment Safety Pressure Relief Facility Process Design Specifications" puts forward the requirement that the insulation layer of the safety pressure relief valve pipeline with gasifiable media should withstand fire conditions for 2 hours. Therefore, manufacturers, users, and design institutes of this type of fire resistance system have put forward experimental and testing requirements.

[0003] Compared with the fire protection requirements of the construction industry, the passive fire protection (fire resistance) systems used in the oil and gas and chemical industries have more complex and diverse application objects and working conditions, and it is necessary to examine the temperature rise curve and temperature resistance time limit of the actual medium or device inside the fire protection system. At present, it is difficult to cover the working conditions and requirements of actual needs by simply relying on sample measurements. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for testing the fire resistance of pipeline insulation and fireproofing materials. A safe medium can be used for experiments and a finite element model can be established. The physical properties of the target medium are then replaced in the model for design calculations.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A method for testing the fire resistance performance of pipeline thermal insulation and fireproofing materials comprises the following steps:

[0007] Step 1, modeling experiment: select a test piece, cover the outside of the test piece with fireproof material and put it into the test furnace, let a static or continuously flowing medium into the test piece, start the experiment and record the temperature rise curve in the test furnace and the test piece, or record the temperature rise curve in the test furnace, the test piece and the medium inside the test piece;

[0008] Step 2: Establish a finite element model: Use the finite element fluid-solid heat transfer model to establish a three-dimensional structural model that is the same as the experiment in step 1; at the same time, set the physical properties of the test piece, medium and fireproof material according to the actual material quality;

[0009] Load the temperature rise curve recorded in the experiment, calculate the established finite element model, and then compare and check it with the temperature rise curve of the test piece. After reaching the target accuracy, determine the model;

[0010] Step 3: Finite element model-assisted calculation: Use the model determined in step 2 to calculate and design the fire protection system for the fire protection object with the same or similar structure as the test piece; when calculating, use one or more of the geometric dimensions, material, physical properties of the medium, and material of the fire protection material of the fire protection object as design parameters, and use the temperature rise limit and / or aging of the fire protection material as boundary conditions;

[0011] Step 4: Verification test: The fire protection system calculated and designed in step 3 is subjected to a verification test to verify the calculation results. If the verification test results reach the set accuracy, the finite element model established in step 2 meets the standard. If the verification test results do not reach the set accuracy, the fire protection system calculation and design are re-performed for the model or physical parameters in step 2, and step 4 is repeated;

[0012] Step 5. Use the qualified finite element model in step 4 to design the fire protection system for different fire protection objects under the same working conditions, and generate one or more of the following: fire protection system structure, fire protection material performance indicators, fire protection material thickness, insulation performance indicators of fire protection materials under normal operation, fire protection time limit of fire protection materials, medium temperature rise curve and total heat absorption, and corresponding safe operating temperature limit to determine the fire protection time limit.

[0013] Furthermore, in step 2, the physical property parameters include material density, heat capacity, and thermal conductivity.

[0014] Furthermore, in step 1, the test piece is a valve actuator, the medium is air, and the temperature rise curves in the test furnace and the test piece are recorded during the experiment.

[0015] Furthermore, in step 1, the test piece is a pipe, the medium is air or water at a constant flow rate, and the temperature rise curves of the test furnace, the test piece, and the medium inside the test piece are recorded during the experiment.

[0016] The beneficial effects of the present invention are:

[0017] The present invention can use a safe medium to conduct experiments and establish a finite element model, and then replace the physical property parameters of the target medium in the model to perform design calculations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural model diagram in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] The present invention provides a technical solution:

[0021] Example 1

[0022] A method for testing the fire resistance performance of pipeline thermal insulation and fireproofing materials comprises the following steps:

[0023] Step 1, modeling experiment: select the valve actuator as the test piece, cover the test piece with fireproof material and put it into the test furnace, set the pipe medium in the cavity of the internal mechanism of the test piece (the pipe medium in this embodiment is water), start the experiment and record the temperature rise curve in the test furnace and the test piece, or record the temperature rise curve in the test furnace, the test piece and the medium inside the test piece;

[0024] Step 2: Establish a finite element model: Use the finite element fluid-solid heat transfer model to establish a three-dimensional structural model that is the same as the experiment in step 1. The structure and size of the three-dimensional structural model are consistent with the furnace part of the test piece. A 1 / 2 symmetrical model can be used to speed up the calculation. (The specific three-dimensional structural model in this embodiment is as follows Figure 1 shown);

[0025] Figure 1 In the figure, the geometric dimensions of the three-dimensional structure model are consistent with the real experimental object, as follows:

[0026] Steel pipe length (furnace part): 1200mm; pipe outer diameter: 168mm; wall thickness: 3.5mm;

[0027] The steel pipe is inclined 10° to the horizontal direction (low inflow and high outflow)

[0028] The thickness of the insulation material is consistent with the experimental object:

[0029] In Example 1, the aerogel thickness is set to 50 mm;

[0030] In Example 2, the thickness of the aluminum silicate is set to 40 mm and the thickness of the aerogel is set to 20 mm.

[0031] At the same time, the physical properties of the test piece, medium and fireproof material are set according to the actual material, as shown in Tables 1 to 8 below;

[0032] 1. The steel pipe (test piece) is made of carbon steel (Steel AISI 4340)

[0033] (1) The main parameters are:

[0034]

[0035] Table 1

[0036] Note: Because the thermal conductivity of steel is high and the wall thickness is thin, constant thermal conductivity and heat capacity are used. In addition, the density of steel changes slightly within the temperature range of the experiment, so constant parameters are also used.

[0037] 2. The medium in the steel pipe is liquid water

[0038] The main parameters are:

[0039]

[0040] Table 2

[0041] (1) The formula for constant pressure heat capacity Cp(T) is:

[0042] Cp=12010.1471-80.4072879*T^1+0.309866854*T^2-5.38186884E-4*T^3+3.62536437E-7*T^4 (temperature range: 273.15K~553.15K);

[0043] (2) Density rho(T) formula:

[0044] rho(T)=0.000063092789034*T^3-0.060367639882855*T^2+18.9229382407066*T-950.704055329848 (temperature range 273.15K~293.15K);

[0045] rho(T)=0.000010335053319*T^3-0.013395065634452*T^2+4.969288832655160*T+432.257114008512 (temperature range 293.15K~373.15K);

[0046] (3) Thermal conductivity k(T) formula:

[0047] k(T)=-0.869083936+0.00894880345*T^1-1.58366345E-5*T^2+7.97543259E-9*T^3 (temperature range 273.15K~553.15K);

[0048] 3. Fireproof and thermal insulation materials

[0049] 3.1 High temperature resistant aluminum silicate material

[0050] (1) The main parameters are:

[0051]

[0052] Table 3

[0053] (2) Thermal conductivity K4(T) uses interpolation function:

[0054]

[0055] Table 4

[0056] (3) Constant pressure heat capacity CCP(T) uses the interpolation function:

[0057]

[0058] Table 5

[0059] 3.2 Armagel HTF fire-resistant aerogel

[0060] (1) The main parameters are:

[0061]

[0062] Table 6

[0063] (2) Thermal conductivity K2(T) uses interpolation function:

[0064]

[0065] Table 7

[0066] (3) Constant pressure heat capacity ACP(T) uses the interpolation function:

[0067]

[0068] Table 8

[0069] Load the temperature rise curve recorded in the experiment, calculate the established finite element model, and then compare and check it with the temperature rise curve of the test piece. After reaching the target accuracy, determine the model;

[0070] Among them: 1. The target accuracy is evaluated by the goodness of fit R², and the expression is R²=SSR / SST=1-SSE / SST. The closer this statistic is to 1, the higher the goodness of fit of the model. Therefore, R²>=0.95 is set to meet the accuracy requirement. For example, the goodness of fit between the heating curve obtained in the experimental scheme (20mm aerogel + 40mm aluminum silicate) and the heating curve calculated by the model reaches 0.98 (the goodness of fit of the heating curve is calculated according to the data in Table 9 below combined with the R² calculation formula to be 0.98476462), which has good accuracy.

[0071]

[0072] Table 9

[0073]

[0074] Table 9 (Continued)

[0075]

[0076] Table 9 (Continued)

[0077] 2. If the target accuracy (0.95) is not achieved, the model needs to be checked and adjusted. The main checks should be whether the model structure is completely consistent with the geometric shape of the test piece, whether the boundary conditions such as the furnace temperature rise curve, medium flow rate, etc. are set correctly, and whether the various physical property parameters of the material in the model are set reasonably. According to practical experience, the main parameter adjusted in modeling is the thermal conductivity of the fireproof insulation material in the high temperature section. Because there is no measured value for the thermal conductivity of most insulation materials in the high temperature zone, and under high temperature combustion conditions, there may be morphological changes such as mass loss and large shrinkage of the material. The thermal conductivity of the high temperature section can be appropriately adjusted to simulate the change in insulation performance, thereby obtaining an effect close to the actual experimental conditions.

[0078] Step 3: Finite element model-assisted calculation: Use the model determined in step 2 to calculate and design the fire protection system for fire protection objects with the same or similar structure as the test piece (the same or similar structure means that the functions are the same but the structural dimensions are different); when calculating, use one or more of the geometric dimensions, material, physical properties of the medium, and material of the fire protection material as design parameters, and use the temperature rise limit and / or aging of the fire protection material as boundary conditions;

[0079] Step 4, verification experiment: conduct a verification experiment on the fire protection system calculated and designed in step 3 (wherein the verification experiment: the verification experiment is based on the determined finite element model (the finite element model in step 2), adjust the external dimensions of the test piece, the physical properties of the medium and the thickness combination of the fire protection material, and perform simulation calculations first. Then conduct experiments with the same calculation conditions to verify the calculation results.) to verify the calculation results. If the verification experiment results reach the set accuracy, the finite element model established in step 2 meets the standard, or if the verification experiment results do not reach the set accuracy, then re-calculate and design the fire protection system for the model or physical properties in step 2 and repeat step 4;

[0080] Step 5. Use the qualified finite element model in step 4 to design the fire protection system for different fire protection objects under the same working conditions, and generate the system structure and fire protection material performance indicators. Provide the thickness of the fire protection material according to the fire protection time limit required for the fire protection object, and provide the insulation performance indicators of the fire protection object under normal operation.

[0081] This embodiment is applicable to the design of a fire protection system that ensures the structural strength type: this type of fire protection is similar to steel structure fire protection, and is intended to prevent the influence of temperature rise on structural strength under fire conditions.

[0082] However, in the petrochemical industry, it is not only for structural steel, but also extended to pipelines, supports, tower skirts and other different forms and materials. 538°C is usually still used as the upper limit of carbon steel temperature resistance. For some small and medium diameter steel pipes, the temperature rise curve of petrochemical hydrocarbon fire can be directly tested. However, it is inconvenient to conduct direct testing for larger diameters and other forms of structures (such as tower skirts). The finite element model can be used to simulate and calculate objects of more forms and large geometric dimensions. At present, the more mature Hp / A calculation method of finite element calculation is abroad.

[0083] Embodiment 2:

[0084] The difference between this embodiment and embodiment 1 is that, step 1, modeling experiment: select a pipe shape or a small container of appropriate geometric size as a test piece (a pipe is selected in this embodiment), cover the outside of the test piece with fireproof material and put it into a test furnace (the test furnace can be but not limited to the test furnace in CN213780005U, so that different pipe types can be tested), and a pipe medium with a constant flow rate is passed into the test piece. In this embodiment, the pipe medium is water (water enters from one end of the pipe and flows out from the other end), and then start the experiment and record the temperature rise curve in the test furnace and the test piece, or record the temperature rise curve in the test furnace, the test piece and the medium inside the test piece;

[0085] Step 2: Establish a finite element model: Use the finite element fluid-solid heat transfer model to establish a three-dimensional structural model that is the same as the experiment in step 1. The structure and size of the three-dimensional structural model are consistent with the furnace part of the test piece. A 1 / 2 symmetrical model can be used to speed up the calculation. (The specific three-dimensional structural model is as follows Figure 1 As shown); at the same time, the physical properties of the test piece, the medium and the fireproof material are set according to the actual material (the physical properties are the same as those in Example 1 and will not be repeated here);

[0086] Load the temperature rise curve recorded in the experiment, calculate the established finite element model, and then compare and check it with the temperature rise curve of the test piece. After reaching the target accuracy, determine the model;

[0087] Wherein: 1. The target accuracy is evaluated by goodness of fit R², and the expression is R²=SSR / SST=1-SSE / SST. The closer the statistic is to 1, the higher the goodness of fit of the model. Therefore, R²>=0.95 is set to meet the accuracy requirement. For example, the goodness of fit of the heating curve obtained in the experimental scheme (20mm aerogel + 40mm aluminum silicate) and the heating curve calculated by the model reaches 0.98, which has good accuracy. The calculation method of the goodness of fit is the same as that of Example 1, which will not be repeated here.

[0088] 2. If the target accuracy (0.95) is not achieved, the model needs to be checked and adjusted. The main checks should be whether the model structure is completely consistent with the geometric shape of the test piece, whether the boundary conditions such as the furnace temperature rise curve, medium flow rate, etc. are set correctly, and whether the various physical property parameters of the material in the model are set reasonably. According to practical experience, the main parameter adjusted in modeling is the thermal conductivity of the fireproof insulation material in the high temperature section. Because there is no measured value for the thermal conductivity of most insulation materials in the high temperature zone, and under high temperature combustion conditions, there may be morphological changes such as mass loss and large shrinkage of the material. The thermal conductivity of the high temperature section can be appropriately adjusted to simulate the change in insulation performance, thereby obtaining an effect close to the actual experimental conditions.

[0089] Step 3: Finite element model-assisted calculation: Use the model determined in step 2 to calculate and design the fire protection system for fire protection objects with similar structures to the test piece (similar structures refer to those that achieve the same functions but have different structural dimensions); during the calculation, the geometric dimensions of the fire protection object, the material of the components, and the materials of the fire protection and insulation materials are used as design parameters, and the temperature rise limit and / or aging of the fire protection materials are used as boundary conditions;

[0090] Step 4, verification experiment: conduct a verification experiment on the fire protection system calculated and designed in step 3 (wherein the verification experiment: the verification experiment is based on the determined finite element model (the finite element model in step 2), adjust the external dimensions of the test piece, the physical properties of the medium and the thickness combination of the fire protection material, and perform simulation calculations first. Then conduct experiments with the same calculation conditions to verify the calculation results.) to verify the calculation results. If the verification experiment results reach the set accuracy, the finite element model established in step 2 meets the standard, or if the verification experiment results do not reach the set accuracy, then re-calculate and design the fire protection system for the model or physical properties in step 2 and repeat step 4;

[0091] Step 5. Use the qualified finite element model in step 4 to design the fire protection system for different fire protection objects under the same working conditions, and provide system structure and material performance indicators, provide fire insulation thickness regulations according to the required fire protection time limit, provide medium temperature rise curve and total heat absorption, assist in gasification analysis, and provide insulation performance indicators under normal operation.

[0092] In this embodiment, only step 1 is performed to verify whether a certain refractory material protection pipeline can meet the ability of a certain type of pipeline medium to operate safely for a specified time. Specifically, a pipeline shape or a small container with appropriate geometric dimensions is selected as a test piece (a pipeline is selected in this embodiment), and the test piece is coated with fireproof material on the outside and placed in a test furnace (the test furnace can be but is not limited to the test furnace in CN213780005U, so that different pipe types can be tested), and water with a constant flow rate is passed into the test piece (water enters from one end of the pipe mouth and flows out from the other end), and temperature detectors (which can be temperature sensors or thermocouples) are respectively set on the inner wall of the pipeline, the outer wall of the pipeline, and the inside of the pipeline to detect the temperature of the inner wall of the pipeline, the outer wall, and the water. After that, the experiment is carried out with the experimental duration or the temperature rise of the inner wall of the track to a fixed value as the boundary condition. After the experiment starts, the temperature rise curves in the test furnace and the test piece are recorded at the same time, or the temperature rise curves in the test furnace and the test piece are recorded.

[0093] After reaching the boundary conditions, the pipe inner wall temperature and the medium temperature meet the safety temperature of the pipeline medium (water in this embodiment) (set to 80°C to avoid increased pressure inside the pipeline due to evaporation of water). If the pipe inner wall temperature and the medium temperature both meet the pipeline medium safety temperature, it means that the fireproof material meets the requirements for the specified time of safe operation of this type of pipeline medium, otherwise it does not meet the requirements.

[0094] Continuing with steps 2 to 5 is used to design the thickness of the fireproof material for the pipeline medium based on the temperature rise and time information of a certain fireproof material, so that the fireproof material meets the requirements of the pipeline medium for safe operation for a specified time.

[0095] This embodiment is used for the design of a fire protection system of the medium temperature rise control type. According to the requirements of standards and specifications such as SHT 3210 and API521, the temperature rise of the gasifiable medium in the insulated container and pipeline needs to be controlled under fire conditions. This requires loading the medium for testing. A safe medium (such as water, air) can be used for experiments and a finite element model can be established, and then the physical properties of the target medium can be replaced in the model for design calculations.

[0096] Embodiment 3:

[0097] The difference between this embodiment and embodiment 1 or embodiment 2 is that, step 1, modeling experiment: select a valve actuator of appropriate geometric size as a test piece (the sample should be approximately consistent with the actual fire protection object in geometric structure, material and weight), cover the test piece with fireproof material on the outside and put it into a test furnace (the test furnace can be but not limited to the test furnace in CN213780005U), set a pipe medium in the internal cavity of the test piece, and the pipe medium in this embodiment is water, then start the experiment and record the temperature rise curve in the test furnace and the test piece, or record the temperature rise curve in the test furnace and the test piece;

[0098] Step 2: Establish a finite element model: Use the finite element fluid-solid heat transfer model to establish a three-dimensional structural model that is the same as the experiment in step 1. The structure and size of the three-dimensional structural model are consistent with the furnace part of the test piece. A 1 / 2 symmetrical model can be used to speed up the calculation. (The specific three-dimensional structural model is as follows Figure 1 As shown); at the same time, the physical properties of the test piece, the medium and the fireproof material are set according to the actual material (the physical properties are the same as those in Example 1 and will not be repeated here);

[0099] Load the temperature rise curve recorded in the experiment, calculate the established finite element model, and then compare and check it with the temperature rise curve of the test piece. After reaching the target accuracy, determine the model;

[0100] Wherein: 1. The target accuracy is evaluated by goodness of fit R², and the expression is R²=SSR / SST=1-SSE / SST. The closer the statistic is to 1, the higher the goodness of fit of the model. Therefore, R²>=0.95 is set to meet the accuracy requirement. For example, the goodness of fit of the heating curve obtained in the experimental scheme (20mm aerogel + 40mm aluminum silicate) and the heating curve calculated by the model reaches 0.98, which has good accuracy. The goodness of fit calculation is the same as in Example 1 and will not be repeated here.

[0101] Step 3: Finite element model-assisted calculation: Use the model determined in step 2 to calculate and design the fire protection system for a fire protection object with a similar structure to the test piece (similar structure means that the function is the same but the structural dimensions are different). When calculating, the geometric dimensions of the fire protection object, the internal structure material composition of the test piece, and the material of the fire protection material are used as design parameters, and the temperature rise limit and / or aging of the fire protection material are used as boundary conditions.

[0102] Step 4, verification experiment: conduct a verification experiment on the fire protection system calculated and designed in step 3 (wherein the verification experiment: the verification experiment is based on the determined finite element model (the finite element model in step 2), adjust the external dimensions of the test piece, the physical properties of the medium and the thickness combination of the fire protection material, and perform simulation calculations first. Then conduct experiments with the same calculation conditions to verify the calculation results.) to verify the calculation results. If the verification experiment results reach the set accuracy, the finite element model established in step 2 meets the standard, or if the verification experiment results do not reach the set accuracy, then re-calculate and design the fire protection system for the model or physical properties in step 2 and repeat step 4;

[0103] Step 5: Use the qualified finite element model in step 4 to design the fire protection system for different fire protection objects under the same working conditions, and provide system structure and material performance indicators as well as corresponding safe operating temperature limits to determine the fire protection period.

[0104] This embodiment is applicable to the following types of internal mechanical and electrical protection:

[0105] It is necessary to control the temperature upper limit of the mechanical or electrical components inside the fireproof object so that it can operate normally within the required time limit. According to the requirements of SHT3005 and other specifications, passive fire protection measures such as fireproof covers are required for the valve actuator. It is also impossible to conduct full-scale and real sample tests. After modeling the actual experiment through finite element, fire protection design calculations can be performed on more valve types.

[0106] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A method for testing the fire resistance of pipeline thermal insulation and fireproof materials, characterized in that: The steps include: Step 1, modeling experiment: select a test piece, cover the outside of the test piece with fireproof material and put it into the test furnace, let a static or continuously flowing medium into the test piece, start the experiment and record the temperature rise curve in the test furnace and the test piece, or record the temperature rise curve in the test furnace, the test piece and the medium inside the test piece; Step 2: Establish a finite element model: Use the finite element fluid-solid heat transfer model to establish a three-dimensional structural model that is the same as the experiment in step 1; at the same time, set the physical properties of the test piece, medium and fireproof material according to the actual material quality; Load the temperature rise curve recorded in the experiment, calculate the established finite element model and compare and check it with the temperature rise curve of the test piece, and determine the model after reaching the target accuracy; the target accuracy is evaluated by the goodness of fit R², and when R²>=0.95, the target accuracy requirement is met; Step 3: Finite element model-assisted calculation: Use the model determined in step 2 to calculate and design the fire protection system for the fire protection object with the same structure as the test piece; when calculating, use one or more of the geometric dimensions, material, physical properties of the medium, and material of the fire protection material of the fire protection object as design parameters, and use the temperature rise limit and / or aging of the fire protection material as boundary conditions; Step 4: Verification test: The fire protection system calculated and designed in step 3 is subjected to a verification test to verify the calculation results. If the verification test results reach the set accuracy, the finite element model established in step 2 meets the standard. If the verification test results do not reach the set accuracy, the fire protection system calculation and design are re-performed for the model or physical parameters in step 2, and step 4 is repeated; Step 5. Use the qualified finite element model in step 4 to design the fire protection system for different fire protection objects under the same working conditions, and generate one or more of the following: fire protection system structure, fire protection material performance indicators, fire protection material thickness, insulation performance indicators of fire protection materials under normal operation, fire protection time limit of fire protection materials, medium temperature rise curve and total heat absorption, and corresponding safe operating temperature limit to determine the fire protection time limit.

2. The fire resistance performance test method of pipeline thermal insulation and fireproofing materials according to claim 1 is characterized by: In the step 2, the physical property parameters include material density, heat capacity, and thermal conductivity.

3. The fire resistance performance test method of pipeline thermal insulation and fireproofing materials according to claim 2 is characterized by: In the step 1, the test piece is a valve actuator, the medium is air, and the temperature rise curves in the test furnace and the test piece are recorded during the experiment.

4. The fire resistance performance test method of pipeline thermal insulation and fireproofing materials according to claim 2 is characterized by: In the step 1, the test piece is a pipe, the medium is air or water with a constant flow rate, and the temperature rise curves of the test furnace, the test piece, and the medium inside the test piece are recorded during the experiment.

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