GB/T 47374-2026Chemical oxygen generators for aviation (English PDF)

4.1 Symbols and Codes

The product label should clearly and permanently display the manufacturer, product model name, and serial number.

4.2 Materials

The materials used in chemical oxygen generators must meet the following requirements.

a) Environmental requirements specified in this document;

b) It can resist ozone;

c) Exposure to oxygen should not cause harmful reactions; chemicals and reaction products generated during the oxygen production process should not be in contact with structural materials.

No harmful reactions should occur.

4.3 Structure and Design

4.3.1 Composition

A chemical oxygen generator typically consists of an oxygen core, shell assembly, insulation layer, filter, cable assembly, starting mechanism, safety valve, output port assembly, and extinguishing device.

It consists of a consumption indicator, a dust cover, and a safety pin, etc. Figure 1 shows the components of a typical chemical oxygen generator.

4.3.2 Oxygen Core

Oxygen cores are generally composed of sodium chlorate or similar alkaline metal chlorates or perchlorates, and the combustion agent and catalyst are used according to specific design requirements.

It is formulated with agents and other regulators and additives. As an oxygen source, the oxygen core should have a specific formula, shape, and weight to meet the output flow requirements.

The oxygen core is installed inside a sealed housing assembly.

4.3.3 Housing Assembly

The housing assembly should be a thin-walled structure, capable of withstanding three times the maximum operating pressure without breaking. The outer casing is generally made of stainless steel, while the inner...

The cylinder body is made of high-temperature resistant material.

4.3.4 Insulation layer

Chemical oxygen generators should be equipped with a heat-insulating layer to protect against high temperatures, ensuring that the surface temperature of the outer casing generated during operation does not exceed the limits for aircraft or other equipment.

The crew members caused harm.

4.3.5 Filter

The filter should be suitable for removing trace gaseous impurities and solid particles generated during the oxygen production process. The materials used should avoid any defects found in the product.

It can withstand the high temperatures during the reaction process, even if the filtration efficiency decreases or the product deteriorates within the shelf life.

4.3.6 Cable assembly

The cable assembly typically consists of ropes and loops, and can be directly connected to the starting pin on the starting mechanism. Pulling either cable should enable...

Start the operation of the mechanism.

4.3.7 Starting Mechanism

The starting mechanism should include a starting pin, spring, firing pin, and flash cap. This mechanism is used to ignite the flash cap and initiate the chemical reaction. The mechanism should be connected by a cable.

To control the startup.

4.3.8 Safety valve

Chemical oxygen generators should be equipped with safety valves. When internal overpressure occurs, the safety valves should overcome the spring force to release the pressure.

4.3.9 Output Port Components

Output port assemblies are generally equipped with a one-way valve. Output port assemblies can be designed in single-nozzle, double-nozzle, triple-nozzle, or other forms as needed, and can...

Rotate along the axis to any direction.

4.3.10 Consumption Indicator Marker

Consumption indicator marks are typically a non-black, heat-sensitive band, used to check the status of chemical oxygen generators.

4.3.11 Dust cover

All openings on the chemical oxygen generator should be equipped with dust covers to prevent dust from entering and clogging the output.

4.3.12 Insurance sales

A safety pin is a safety locking device used to prevent the chemical oxygen generator from being accidentally activated in non-emergency situations.

4.4 Performance

4.4.1 Consumption Indicator

When the chemical oxygen generator is in the unfired state, the consumption indicator is not black. Once the chemical oxygen generator fires and the oxygen core is working, the consumption indicator...

The markings should be black.

4.4.2 Operating tension

The operating force of the starting mechanism should be maintained within the range of 4.4N to 40N at any angle within a 120° cone angle in the pulling direction.

4.4.3 Oxygen Flow Start-up

The starting mechanism should have an airflow within 5 seconds after the spark cap is fired, and reach the required value within 10 seconds.

4.4.4 Oxygen supply and time

The oxygen supply and duration should meet the requirements of the compatible aircraft model, and the oxygen supply at each altitude should be greater than that of the passenger oxygen masks used for testing.

Approved traffic.

4.4.5 Oxygen purity

4.4.5.1 Purity

The oxygen purity should reach 99.5% or higher.

4.4.5.2 Water vapor

At a temperature of 21°C and an atmospheric pressure of 101.3kPa, the water vapor content per liter of oxygen should not exceed 20mg.

4.4.5.3 Chlorine and various chlorine derivatives

The average weighted concentration of pollutants such as chlorine and various chlorine derivatives during the reaction process, within a time period not exceeding 5 minutes, should not exceed [a certain value].

The peak concentration during the entire reaction process should not exceed 1.0×10^-^6.

4.4.5.4 Carbon monoxide

The average weighted concentration of carbon monoxide during the reaction process should not exceed 50 × 10^-^6 over a period of no more than 5 minutes. The entire reaction process...

The peak concentration should not exceed.200×10-6.

4.4.5.5 Carbon Dioxide

The average weighted concentration of carbon dioxide during the reaction process should not exceed 5000 × 10^-^6 over a period of no more than 5 minutes. The entire reaction process...

The peak concentration should not exceed 30,000 × 10^-^6.

4.4.5.6 Solvent

The average weighted concentration of the solvent (trichloroethylene, carbon tetrachloride, etc.) during the reaction process should not exceed [a certain value] over a period of no more than 5 minutes.

0.2×10-6.

4.4.5.7 Solid Particles

Solid particles should not exceed 500 µm.

4.4.5.8 Fibers

The fiber length should not exceed 3000µm and the diameter should not exceed 40µm.

4.4.5.9 Total Solids

The total amount of solid matter in each liter of oxygen should not exceed 0.1 mg.

4.4.6 Gas and structural temperatures

4.4.6.1 Oxygen Temperature

When the ambient temperature is 24°C±5°C, the temperature of the oxygen delivered to the user's mouth and nose by the chemical oxygen generator should not exceed the ambient temperature.

5°C.

4.4.6.2 Outlet surface temperature

When the ambient temperature is 24°C±5°C, the surface temperature at the outlet of the chemical oxygen generator should not exceed 82°C.

4.4.6.3 Surface temperature of the outer casing

When the ambient temperature is 24°C±5°C, the surface temperature of the outer casing should not exceed 315°C.

4.4.7 Pressure

4.4.7.1 Work pressure

The maximum working pressure of a chemical oxygen generator is generally no more than 343 kPa.

4.4.7.2 Safety valve opening pressure

The opening pressure of the safety valve of the chemical oxygen generator should not exceed 1.5 times the working pressure.

4.4.7.3 Verify pressure

Chemical oxygen generators should be able to withstand 1.5 times the maximum working pressure without permanent deformation.

4.4.7.4 Destructive Pressure

The chemical oxygen generator should be able to withstand three times the maximum working pressure without breaking.

4.4.7.5 External pressure

The chemical oxygen generator should be able to withstand an external pressure of not less than 170 kPa without permanent deformation.

4.4.8 Leakage

Under the verification pressure specified in 4.4.7.3, the chemical oxygen generator shall not leak.

4.4.9 Decompression

During decompression at the specified height, the oxygen supply and duration shall meet the requirements of 4.4.4.

4.4.10 Tensile Strength

The cable assembly should be able to withstand a tensile force of 88N without permanent deformation or damage.

4.5 Environmental adaptability

4.5.1 Temperature and Altitude

After the temperature test, the oxygen supply capacity and time of the chemical oxygen generator should meet the requirements of 4.4.4.

After the low-pressure test, the oxygen supply and time of the chemical oxygen generator should meet the requirements of 4.4.4.

After the decompression test, the oxygen supply and time of the chemical oxygen generator should meet the requirements of 4.4.4.

After the chemical oxygen generator has undergone the overpressure test, the oxygen supply and time should meet the requirements of 4.4.4.

4.5.2 Temperature Change

After at least two cycles of temperature change from -40°C to 70°C, the oxygen supply and time of the chemical oxygen generator should meet the requirements of 4.4.4.

4.5.3 Humid and hot

The chemical oxygen generator passes through a high-temperature, high-humidity section with a temperature of 50°C and a relative humidity of 95%, and a low-temperature, high-humidity section with a temperature of 38°C and a relative humidity of not less than [missing value].

After an 85% humidity and 2-day damp heat test, the oxygen supply and time should comply with the requirements of 4.4.4, and the appearance should meet the following requirements.

a) Slight tarnishing or blackening of metal structural components is permissible, but corrosion is not allowed;

b) There should be no severe corrosion at the metal joints;

c) The corroded area of the metal protective layer should not exceed 20% of the total area of the metal protective layer;

d) The paint layer should be free of bubbles, wrinkles, cracks, or peeling; the base metal should be free of corrosion except at local edges.

e) Non-metallic parts should not have obvious whitening, swelling, blistering, cracking, or pitting.

4.5.4 Safety from workplace impacts and falls

The chemical oxygen generator was tested three times per axial direction under the conditions of a sawtooth wave at the rear peak, a peak acceleration A of 6g, and a duration D of 11ms.

After the impact, the oxygen supply and duration should comply with the provisions of 4.4.4.

The chemical oxygen generator operates once per axial direction under the conditions of a sawtooth wave at the rear peak, a peak acceleration A of 20g, and a duration D of 11ms.

After a fall impact, twisting and deformation are permissible, but the mounting connections should not be damaged and the structure should remain intact.

After a chemical oxygen generator is subjected to a sustained impact load of 9g for at least 3 seconds in all directions, torsion and deformation are permissible, but safety is not guaranteed.

The connectors should be undamaged and the structure should be intact.

4.5.5 Vibration

Under vibration conditions, the chemical oxygen generator should not suffer damage to its internal or external components, and the oxygen supply rate and duration should comply with 4.4.4.

According to the regulations.

4.5.6 Mold

After undergoing a mold test at 30°C and 97%±2% relative humidity for 28 days, the surface mold growth of the chemical oxygen generator should not exceed [a certain value].

The total area is 30%. Furthermore, the oxygen supply and duration should comply with the provisions of 4.4.4.

4.5.7 Salt spray

After being exposed to atmospheric conditions with a salt spray deposition rate of 1 mL/(80 cm²·h) to 3 mL/(80 cm²·h) for 48 hours, the chemical oxygen generator...

The oxygen supply volume and duration shall comply with the provisions of 4.4.4, and the appearance shall meet the following requirements.

a) Slight tarnishing or blackening of metal structural components is permissible;

b) There is no severe corrosion at the metal joints;

c) The corroded area of the metal protective layer shall not exceed 30% of the total area of the metal protective layer;

d) The paint layer is free of bubbles, wrinkles, cracks, or peeling;

e) Non-metallic parts should not have obvious whitening, swelling, blistering, cracking, or pitting.

5.1 Marks and Codes

The markings and codes of the chemical oxygen generator should be visually inspected and should meet the requirements of 4.1.

5.2 Consumption Indicator

Visually inspect the color of the consumption indicator markings on the chemical oxygen generator (both in the non-firing and firing states), and the test results should meet the requirements of 4.4.1.

5.3 Operating tension

The required tension required for the cable assembly to disengage from the starting mechanism should be measured using a special device, and the test results should meet the requirements of 4.4.2.

5.4 Oxygen Flow Start-up

The time from the ignition of the chemical oxygen generator to the generation of maximum flow should be tested using specialized equipment, and the test results should meet the requirements of 4.4.3.

5.5 Oxygen supply and time

Use specialized equipment to test the oxygen supply and time of the chemical oxygen generator, and the test results should meet the requirements of 4.4.4.

5.6 Oxygen purity

The purity of the oxygen output from the chemical oxygen generator shall be tested, and the test results shall meet the requirements of 4.4.5.

5.7 Oxygen Temperature

During the operation of the chemical oxygen generator, the oxygen temperature at the end of the mask assembly (the hose connecting the mask is 1m~1.2m long) is recorded every 30 seconds.

The test results should meet the requirements of 4.4.6.1.

5.8 Outlet surface temperature

During the operation of the chemical oxygen generator, the surface temperature at its outlet should be recorded every 30 seconds, and the test results should meet the requirements of 4.4.6.2.

5.9 Surface temperature of the outer casing

Use specialized equipment to measure the temperature at different points on the shell of the chemical oxygen generator during operation. Temperature measurement points should be located in key positions.

At least three temperature measuring points should be evenly distributed around the circumference of the initiation end, output end, and middle section of the chemical oxygen generator, and the temperature should be recorded every 30 seconds.

The temperature at one location should meet the requirements of 4.4.6.3.

5.10 Work Pressure

The peak operating pressure of the chemical oxygen generator should be tested using specialized equipment, and the test results should meet the requirements of 4.4.7.1.

5.11 Safety valve opening pressure

Before assembling the output port assembly of the chemical oxygen generator, a certain pressure of gas is input into the output port using a special tool to test the opening of the safety valve.

The pressure test results shall comply with the provisions of 4.4.7.2.

5.12 Verification of Pressure

Block the safety valve of the chemical oxygen generator. Before assembling the output port assembly, use a special tool to input the specified verification pressure from the output port.

The force test results shall comply with the provisions of 4.4.7.3.

5.13 Destructive Pressure

Block the safety valve of the chemical oxygen generator. Before assembling the output port assembly, use a special tool to input the specified destructive pressure from the output port.

The force test results shall comply with the provisions of 4.4.7.4.

5.14 External Pressure

When an external pressure of not less than 124 kPa is applied to the chemical oxygen generator, the test results shall comply with the provisions of 4.4.7.5.

5.15 Leakage

During the 5.12 verification pressure test, an air bubble solution was applied to all connections to check for leaks. The test results should meet the requirements of 4.4.8.

Require.

5.16 Stress Reduction

The decompression test shall be conducted according to the descent profile of the matching model, and the test results shall meet the requirements of 4.4.9.

5.17 Tensile Strength

Under a tensile force of 88N, the cable assembly should not undergo permanent deformation, and the test results should meet the requirements of 4.4.10.

5.18 Temperature and Altitude

The chemical oxygen generator shall be tested according to the test procedures specified in Chapters 5 and 6 of HB6167.2-2014, and the test results shall meet the requirements.

Requirements of 4.5.1.

5.19 Temperature Change

The chemical oxygen generator shall be tested according to the test procedures specified in Chapter 7 of HB6167.3-2014, and the test results shall meet the requirements of 4.5.2.

Require.

5.20 Hot and humid

The chemical oxygen generator shall be tested according to the test procedures specified in Chapter 7 of HB6167.4-2014, and the test results shall meet the requirements of 4.5.3.

Require.

5.21 Workplace Impact and Fall Safety

The chemical oxygen generator shall undergo a working impact test according to the test procedures specified in Chapter 8 of HB6167.5-2014, and the test results shall meet the requirements.

Requirements of 4.5.4.

The chemical oxygen generator shall undergo a crash safety test according to the test procedures specified in Chapter 8 of HB6167.5-2014, and the test results shall meet the requirements.

Requirements of 4.5.4.

5.22 Vibration

The chemical oxygen generator shall be tested according to the test procedures specified in Chapter 6 of HB6167.6-2014, and the test results shall meet the requirements of 4.5.5.

Require.

5.23 Mold

The chemical oxygen generator shall be tested according to the test procedures specified in Chapter 8 of HB6167.11-2014, and the test results shall meet the requirements of 4.5.6.

Require.

5.24 Salt spray

The chemical oxygen generator shall be tested according to the test procedures specified in Chapter 7 of HB6167.12-2014, and the test results shall meet the requirements of 4.5.7.

Require.

6.1 Inspection Classification

The inspection categories specified in this document are as follows.

a) Factory inspection;

b) Type testing.

6.2 Inspection conditions

Unless otherwise specified, the test shall be conducted under the following conditions.

a) Measuring tools and instruments used for inspection and measurement shall conform to the provisions of national or industry standards and be verified by a qualified metrological verification machine.

The measuring instruments and equipment must be certified as qualified and used within their validity period. The measuring range and accuracy of the measuring tools and equipment should meet the requirements for product testing and inspection.

b) The test conditions shall comply with the provisions of Chapter 4 of HB6167.1-2014.

6.3 Factory Inspection

6.3.1

Each chemical oxygen generator shall undergo factory inspection and obtain a product quality inspection certificate.

6.3.2

Factory inspection items shall be carried out in accordance with 5.1 and 5.2 (unfired state).

If any test fails during factory inspection, the cause should be identified, the issue corrected, and the relevant test performed again. If the requirements still cannot be met, the investigation should continue.

If the result is unsatisfactory, the inspection and testing will be deemed unqualified.

6.4 Type Testing

Type testing should be conducted in the following situations.

a) After the product has been identified and approved, the manufacturer will conduct its first trial production or small-batch trial production.

b) Changes in the design or process of a chemical oxygen generator may cause changes in certain characteristics and parameters.

c) The inspection results show an unacceptable deviation from the previous type test results.

d) Chemical oxygen generators produced in batches shall be subject to periodic random inspections, once a year. When the number of generators requiring inspection is too large, the inspection interval may be adjusted.

Extend the period appropriately, but conduct random checks at least once every two years.

For type testing, 5% of the total number of products that have passed factory inspection are randomly selected, but no fewer than 2 pieces. If any of these pieces are found to be defective, a penalty will be imposed.

If a test fails, the number of samples for that test should be doubled. If the test still fails, the batch of products is considered unqualified.

Type testing items should include all performance testing items specified in this document.

7.1 Protective Packaging

The sealing and packaging of chemical oxygen generators shall be carried out in accordance with the relevant provisions of HB5028.

7.2 Packing

The packing of chemical oxygen generators shall be carried out in accordance with the relevant provisions of HB5028.

7.3 Transportation and Storage

The transportation and storage of chemical oxygen generators shall be carried out in accordance with the relevant provisions of HB5028.

7.4 Marking

The packaging markings of chemical oxygen generators should comply with the requirements of GB/T 191, including "Keep away from sunlight", "Keep away from radiation", "Keep away from rain", and "Do not roll".