1. Subject content and scope of application

This standard specifies the fire test equipment, test conditions, test requirements, test procedures and fire time determination conditions of elevator door fire test.

This standard is applicable to fire resistance test of elevator floor doors on the waiting side.

2 Reference Standards

gb 7633 Fire resistance test method for doors and curtains

gb 7588 Safety specification for the manufacture and installation of elevators

3 Test equipment

3.1 Fire test furnace

Fire resistance test of elevator door is done by fire resistance test furnace. The fire side of the elevator floor door shall meet the heating conditions and pressure bar years specified in articles 4.1 and 4.2 of this standard, and meet the requirements of the installation test and observation test process of the specimen.

3.2 Furnace temperature test device

The temperature test device in the furnace shall meet the requirements of Article 1.2 of gb 7633.

3.3 Furnace pressure test device

The pressure test device in the furnace shall meet the requirements of Article 1.4 of gb 7633.

3.4 Test device for the radiation intensity of the specimen's back fire surface

The radiometer for measuring the radiation intensity of the back fire surface of the specimen should have a aiming and receiving system, and can print the value and draw the relationship curve between time and radiation intensity. The position and viewing Angle of the radiometer should be selected to ensure that the full radiant heat flux emitted by the elevator floor door can be measured.

3.5 Gap Measuring instrument

There are two types of gap measuring instrument that can be used to measure the gap amount of the elevator floor door, as shown in Figure 1. The gap measuring instrument is composed of stainless steel and equipped with an insulated handle. The measuring accuracy of the measuring instrument is ±0.5mm.

3.6 Accuracy of test equipment

Each test device shall meet the following accuracy:

http://www.chinaelevator.org/association/ewebeditor/uploadfile/2007227172924853.jpg

Temperature: ±15℃ in the furnace;

Other ±10℃;

Pressure: ±2pa;

Time: ±10s.

4 Test conditions

4.1 Temperature rise conditions

4.1.1 Heating form

Open fire heating should be used so that the elevator floor door is subjected to flame action similar to the actual fire.

4.1.2 Temperature rise curve

During the test, the temperature in the furnace changes with time and is controlled by the following functional relationships:

t=345log10(8t+1)+20 (1)

Where: t - the average temperature in the furnace when the temperature rises to t, ℃;

t - Duration of the test, min.

The curve representing the above functions is shown in Figure 2.

4.1.3 Error

The allowable average deviation of temperature rise in the furnace is determined by equation (2) :

http://www.chinaelevator.org/association/ewebeditor/uploadfile/2007227172925391.jpg

Where: d - average deviation value;

a - the integral value of the average temperature in the furnace as a function of time;

as - The integral value of the time-temperature standard curve over the time function.

The average deviation allowance shall meet the following requirements:

Time t,min

A. When 0≤t≤10, 15%;

b, when 10<t≤30, [15-0.5(T-10)]%;

c, when 30<t≤60, [5-0.083(T-30)]%;

d, when t>60, 2.5%.

The method of integrating the time function is as follows: for a, the interval time does not exceed 1min; For b, the interval is not more than 2 minutes; For c and d, the interval is not more than 5min; The calculation starts at zero time.

When the test is carried out after 10min, the difference between the temperature in the furnace measured at any temperature measurement point and the standard temperature of the corresponding time shall not be greater than ±100℃.

4.2 Pressure Conditions

There is a linear pressure over the entire height of the test furnace. As the temperature in the furnace changes, the pressure gradient at each point in the furnace will change slightly, but the average pressure increase per meter height should be maintained at 8pa. The position of the neutral pressure surface of the test furnace can be adjusted by controlling the supply of compressed air, the size of the opening area of the test furnace and the height of the opening position.

The pressure value in the furnace should be maintained at a rated average value, which ignores the sudden increase and decrease of pressure when vortex is generated. The average pressure in the furnace should be monitored and controlled at any time.

For the elevator floor door, the neutral pressure surface in the test furnace should be established at a height of 500mm above the ground plane of the test specimen, as shown in Figure 3. For specimens with a height greater than 3m, the vertex pressure value should not be greater than 20pa, and the position of the neutral pressure surface should be properly adjusted.

4.3 Fire conditions

The specimen was exposed to fire on the waiting side.

http://www.chinaelevator.org/association/ewebeditor/uploadfile/2007227172925420.jpg

d- net width of door opening; h- clear height of door opening; h- Brick wall opening height

5 Specimen Requirements

5.1 Dimensions

The size of the specimen is the same as that used in practice.

If the actual size of the elevator door is greater than the size of the test furnace, the size of the specimen should be the largest size suitable for the test furnace as far as possible.

5.2 Quantity

The number of specimens is one.

5.3 Structure

The materials, manufacture and decoration of the samples should conform to the actual use of the elevator door. The specimen shall include: one or more door sections, frames and main structural accessories, door suspension mechanisms, closing mechanisms, unlocking devices or controls (door locks, door handles, etc.) and the maximum electrical wiring under normal use.

5.4 Installation

The installation of the specimen should be able to reflect the actual use and meet the installation requirements of the elevator floor door.

The elevator door should be installed on the actual use of similar walls for testing, can be selected concrete wall or brick wall, the thickness of not less than 20mm.

5.5 Maintenance

During the test, the specimen is installed on the wall, and the strength and humidity of the wall should be close to the actual use state. For example, the masonry of the brick wall should be completed within not less than two weeks before the test; for the concrete wall, the pouring should be completed within four weeks before the test, and the maintenance and drying treatment should be carried out at the time.

6 Test procedure

Within 5 minutes before the start of the test, check the initial temperature recorded by all thermocouples, ensure the consistency of these data, and record these data to the factory. The initial deformation of the specimen should also be recorded.

During the test, the waiting side of the specimen should be subjected to fire, and the temperature in the furnace should be less than 50℃ before the test starts. According to the requirements of the standard temperature curve, the test starts at the moment when the test program starts to run, and all the instruments used for measurement and observation start to work.

Tests shall be measured, observed and recorded in accordance with the relevant provisions of Chapters 4 and 7 of this standard. During the test, the test shall be terminated if any of the criteria specified in Article 8 of this standard are found on the specimen. Alternatively, the test may be terminated if the conditions for decision of purchase specified in Chapter 8 of this Standard do not occur, but the predetermined time has been reached.

7 Measurement and observation

7.1 Measurement of temperature in the furnace

The measuring device for temperature in the furnace shall meet the provisions of Article 3.2 of this standard. There shall be 5 to 8 thermocouples evenly distributed in the furnace. The measuring point of each thermocouple shall be 100 mm away from the fire surface of the specimen.

7.2 Pressure measurement in furnace

The measuring device of the pressure in the furnace shall meet the requirements of Article 3.3 of this standard. The pressure in the furnace should be measured on at least three pressure measuring points, the distribution of which is shown in Figure 3. The pressure in the furnace must be controlled so that it meets the pressure value specified in Article 4.2 of this standard.

7.3 Temperature measurement of the specimen's back fire surface

The temperature of the back fire surface of the specimen is measured in accordance with Article 6.3 of gb7633.

Note: The back fire surface temperature of the sample is not measured for the elevator door without insulation layer.

7.4 Measurement of radiation intensity of the specimen's back fire surface

The radiation intensity of the back fire surface of the specimen is measured according to Article 6.4 of gb7633.

7.5 Specimen integrity measurement

7.5.1 Cotton pad test

Cotton pad test press (; b7633 in accordance with Section 6.5.

Note: Cotton pad test is not carried out on the elevator door without insulation layer.

7.5.2 Gap Measurement

During testing, openings and cracks appearing on the surface of the specimen shall be measured at intervals with the gap measuring instrument specified in this standard. The length of the time interval is determined by the failure rate of the specimen. When measuring, two kinds of gap measuring instruments should be used in sequence. The time and location of the opening or crack should be recorded when the following situations occur.

a. The gap gauge with a diameter of 6 mm can be penetrated into the furnace from the opening or crack through the specimen and can be moved up to 150 mm along the opening or crack.

h. Diameter of 2; The mm gap measuring instrument can penetrate into the furnace from the opening or crack through the specimen.

7.5.3 Flame

If a flame appears on the back of the specimen and continues to burn for more than 10 s, the time and location of the flame should be recorded.

7.6 Other Observations

In the course of the test, the deformation of the specimen should be recorded, and the situation of smoke emission should also be recorded.

After the test, a 300 n force should be applied to the metal surface of the specimen, which is perpendicular to the exposed surface and evenly distributed on a 5cm2 round or square surface, and then observe and measure the extent of damage to the elevator floor door.

8 Fire time criteria

If any of the following conditions are found, it indicates that the specimen has reached the fire resistance time:

8.1 Loss of Integrity

8.1.1 Flame appears on the back of the specimen and continues to burn for 10s or more.

8.1.2 The cotton pad test is carried out according to Article 7.5.1 of this standard, and the cotton pad is ignited.

8.1.3 According to Article 7.5.2 of this standard, the crack amount of the specimen is measured, and the length of the opening or crack of the back fire surface of the specimen meets the provisions of Article 7.5.2 a or b of this standard.

8.2 Loss of insulation

8.2.1 At 1m away from the back fire surface of the specimen, the radiant heat flux value reaches 1.0w/cm2.

8.2.2 The average temperature of the specimen's back fire surface exceeds the initial temperature by more than 140℃.

8.2.3 The maximum temperature of the specimen's back fire surface exceeds the initial temperature by more than 180℃.

8.3 Damage

At the end of the test, the specimen has failed to remain mechanically locked and the metal surface cannot withstand the forces specified in Article 7.6 of this standard at any point.

9 Test Report

The test report shall include the following:

a. Name of the entrusting unit;

b, the name of the manufacturer;

c. Test date;

d. Technical data of specimen structure and materials used;

e, temperature, deformation, radiation intensity data and description;

f. Test results;

g. Seal of the inspection unit;

h, the responsible inspector's seal, the director of the inspection Department's signature and the center director's approval.

Annex a

Canopy test (supplement)

a1 Test equipment

The shape and dimensions of the canopy are shown in Figure a1. It is arranged on the back fire surface of the specimen. The canopy is constructed with a steel frame and is inlaid with 20mm thick asbestos insulation panels in the frames on the top and sides of the canopy, with a density of approximately 600kg/m3.

The canopy is supported on the wall where the specimen is mounted, and all gaps between the canopy and the wall should be sealed. The canopy temperature is measured by a thermocouple composed of 6 wires with a diameter of no more than 1mm. The position of the thermocouple is shown in Figure a2.

A porcelain tube of no more than 8mm in diameter should be used where the thermocouple passes through the canopy, the hot end of the thermocouple should be located 25mm below the bottom surface of the canopy, the distance of the porcelain tube extending under the bottom surface of the canopy should not exceed 10mm, and the porcelain tube hole should be on an axis perpendicular to the plane of the canopy.

Temperature measurement for a2 canopy test

The gas temperature under the canopy is measured by 6 thermocouples, the position of which is shown in Figure a1 and Figure a2, and the structure is shown in Figure a3.

http://www.chinaelevator.org/association/ewebeditor/uploadfile/2007227172925102.jpg

D-floor door width, H-floor door opening height; h - height of brick wall opening;

○ - static pressure probe tube position; × - Thermocouple position

http://www.chinaelevator.org/association/ewebeditor/uploadfile/2007227172925940.jpg

a3 Observation and measurement

The temperature and average temperature of each point on the canopy shall not exceed 5min. At the end of the test, the temperature and average temperature of each point on the canopy shall be recorded in the test report.

Additional note:

This standard is proposed by the Ministry of Public Security of the People's Republic of China.

This standard is jointly drafted by the Tianjin Fire Science Research Institute of the Ministry of Public Security, Tianjin Architectural Design Institute and Tianjin Fire Protection Association.