GB 16413-2026Safety technical requirements for non-metallic products used in coal mines (English PDF)

4.1 General Requirements

4.1.1 The safety characteristics of the product shall be clearly stated in the product standard, including mechanical properties, flame retardancy and antistatic properties, weather resistance, and environmental safety. Other safety features.

4.1.2 Mechanical properties shall include the following characteristics:

---Tensile properties;

---Pressure resistance;

---Pulse performance.

4.1.3 Flame retardancy and antistatic properties should include the following characteristics:

---Flame retardancy;

---Antistatic properties.

4.1.4 Weather resistance shall include the following characteristics:

---Flame retardancy and weather resistance;

---Antistatic and weather-resistant properties.

4.1.5 Environmental safety characteristics shall include the following characteristics:

---Limits for lead and arsenic;

---Smoke density properties;

--- Flue gas toxicity properties.

4.1.6 In addition to the safety features mentioned above, the following items should be clearly stated in the product manual:

a) When the product is in relative frictional motion with other media, the metallic structural layer should not be exposed during use;

b) For products that involve environmental pollution, personal injury, or heat release during installation and use, manufacturers and users should clearly define the product selection criteria. Management standards for selection, use, and maintenance.

4.2 Mechanical properties

4.2.1 Tensile properties

When the product is used in applications where there is a risk of tensile failure, its tensile properties shall meet the following requirements:

a) The longitudinal tensile strength of fabric-core and steel cord-core conveyor belts should not be lower than the value specified in the product model.

b) The tensile strength of polyolefin pipes should be no less than 9.0 MPa, the tensile strength of polyvinyl chloride pipes should be no less than 30.0 MPa, and the tensile strength of fiberglass pipes should be no less than 30.0 MPa.

The minimum axial tensile strength of the pipe shall not be less than 35.0 MPa;

c) Positive pressure ventilation ducts with a nominal diameter of 800mm or less shall have a tensile strength of not less than 1300N in both warp and weft directions; those with a nominal diameter of more than 800mm shall have a tensile strength of not less than 1300N in both warp and weft directions.

The tensile strength of the positive and negative pressure ventilation ducts in both the warp and weft directions shall not be less than 2000N;

d) The tensile strength of the resin anchor rod should not be less than 300 MPa;

e) For other products that have a significant risk of tensile failure under other operating conditions, the tensile performance requirements should be clearly specified in their product technical requirements.

4.2.2 Pressure resistance

4.2.2.1 When the product is used in an environment with positive or negative pressure, the positive pressure resistance and negative pressure resistance of the product should be specified according to the requirements of the usage environment.

4.2.2.2 The positive pressure resistance performance shall meet the following requirements:

a) For positive pressure applications, the hydrostatic resistance of PVC pipes, fiber- or steel-wire-reinforced composite plastic pipes should be no less than twice the nominal pressure.

The hydrostatic resistance of polyolefin pipes and fiberglass pipes should be no less than 1.5 times the nominal pressure; the hydrostatic resistance of rubber hoses should also be... The performance should not be less than its maximum operating pressure;

b) For composite pipes and rubber hoses used in positive pressure applications, the burst pressure should not be less than 3 times the nominal pressure; the burst pressure of hydraulic support hoses should be... Not less than 4 times the nominal pressure;

c) For coated/covered composite steel pipes used in positive pressure applications, the hydrostatic resistance should be no less than 1.5 times the design pressure;

d) For positive pressure ventilation ducts with a nominal diameter of 600 mm or less, the wind pressure resistance should not be less than 5 kPa; for nominal diameters of 700 mm or less... The wind pressure resistance of a diameter of 1000mm or more should be no less than 8kPa; the wind pressure resistance of a diameter of 1000mm or more should be no less than 10 kPa;

e) Pipes used for negative pressure ventilation and gas extraction should withstand a positive pressure of not less than 1 MPa.

4.2.2.3 The negative pressure resistance performance shall meet the following requirements:

a) The negative pressure resistance of the ventilation duct product should not be lower than -3.5 kPa;

b) For other products used for gas extraction and negative pressure ventilation, the negative pressure resistance should not be less than -0.097MPa.

4.2.3 Pulse Performance

The pulse test pressure of the hose for hydraulic supports should be no less than 133% of the design pressure, and the number of pulses should be no less than 200,000.

4.3 Flame retardancy and antistatic properties

4.3.1 Flame retardancy

The flame retardancy of the product shall meet the requirements of Table 1.

4.3.2 Antistatic properties

The antistatic properties of the product shall meet the requirements of Table 2.

4.4 Weather resistance

4.4.1 Flame retardancy and weather resistance

For products with a service life of more than one year, after aging treatment at 70°C for 168 hours, their burn-in performance with a blowtorch and an alcohol lamp should meet the following requirements. In accordance with the provisions of 4.3.1.

4.4.2 Antistatic and weather-resistant properties

For products with a service life of more than one year, their antistatic and weather resistance should meet the following requirements:

a) After aging at 70°C for 168 hours, its surface resistivity should meet the requirements of 4.3.2;

b) After immersion in water at room temperature for 24 hours, its surface resistance should meet the requirements of 4.3.2.

4.5 Environmental safety characteristics

4.5.1 Limits for lead and arsenic

The lead and arsenic content in the product should not exceed 1000 mg/kg.

4.5.2 Smoke density performance

For products with low smoke density, the specific optical density Ds(4) after 4 minutes of combustion should not exceed 650. For products with a surface area not exceeding 100 cm²... Products used in a container or enclosed within a metal part are exempt from requirements.

4.5.3 Flue gas toxicity properties

For products with low smoke toxicity, the toxicity of the smoke after combustion should not exceed 1.2. For products with a surface area not exceeding 100 cm² or enclosed in metal... No requirements are required for products used within components.

5.1 Tensile property test

The tensile property test of the product shall be performed in accordance with the following provisions:

a) The tensile strength test of the conveyor belt shall be performed in accordance with the provisions of MT/T 914 and MT/T 668;

b) Tensile strength tests for polyolefin pipes, polyvinyl chloride pipes, and fiberglass pipes shall be conducted in accordance with MT/T 558.1, MT/T 558.2, and The provisions of MT/T 558.3 shall apply;

c) The tensile strength test of the ductwork product in the warp and weft directions shall be performed in accordance with the provisions of MT/T 164;

d) Remove the anchor head and anchor tail from the anchor rod body, cut an 800mm long specimen from the middle section of the rod body, and glue the two ends together with adhesive for 300mm each.

Within a matching steel pipe, the bond strength is made greater than the tensile strength of the rod, and the tensile strength is tested on a universal testing machine. Measurement;

e) For other products, the tensile property test method should be specified in the relevant product technical requirements.

5.2 Pressure Resistance Test

Unless otherwise agreed, the pressure resistance test of the product shall be carried out in accordance with the following provisions:

a) Both hydrostatic and burst tests should be conducted in an environment where the medium inside and outside the sample is clean tap water at a temperature of 20°C±3°C.

b) For hydrostatic and burst tests, the nominal diameter D is less than 160 mm, and the effective length of the sample is the longer of 5D or 300 mm;

For samples with a nominal diameter of 160 mm or more, the effective length is the longer of 3D or 760 mm, but not exceeding 1200 mm; The quantity is 3 pieces each.

c) The length of the specimen for the negative pressure resistance test is 5 times the nominal diameter of the pipe or 1000 mm, whichever is longer, and the quantity is 1 specimen.

d) When conducting hydrostatic tests on pipes intended for positive pressure applications, first fill the sample chamber with approximately 0.1 MPa of clean tap water, and then... The pressure should be uniformly increased to the specified pressure within 30 seconds to 1 hour. Polyolefin and polyvinyl chloride pipes should undergo a pressure holding test for 100 hours. Fiberglass pipes... Perform a pressure holding test for 5 minutes; perform a pressure holding test for 1 hour for fiber or steel wire reinforced composite plastic pipes; perform a pressure holding test for rubber hoses.

A 1-minute hydrostatic pressure test was conducted; a 5-second pressure holding test was performed on the coated/covered composite steel pipe, and the results were recorded on whether the sample was held for the specified time. There is leakage or damage.

e) When conducting hydrostatic tests on pipes used for negative pressure ventilation and gas extraction, pressurize to the specified pressure and hold for 1 hour, recording the results. Check for any leakage or damage to the sample.

f) When conducting hydrostatic tests on the pipelines and accessories in the section where the safety assurance facilities of the gas transmission system are installed, the pressure is increased to 2.5 MPa and held for 1 hour.

Record whether there is any leakage or damage to the sample.

g) When conducting the burst test, first fill the sample chamber with clean tap water at approximately 0.1 MPa, and the equipment should pressurize within 60 to 70 seconds.

Complete the burst, record the burst pressure, or at least increase the pressure to the minimum burst pressure required by the product, and record whether the sample leaks at this point. Destructive phenomena.

h) After maintaining the air pressure specified in 4.2.2.2 for 5 minutes, read the pressure gauge value and record the status of the air duct.

i) The negative pressure resistance test shall be conducted at a pressure of -0.097 MPa under standard atmospheric pressure for 100 hours. If the local atmospheric pressure is lower than the standard atmospheric pressure, then... The test pressure should be calculated proportionally, and any signs of suction flattening or damage should be recorded.

5.3 Pulse performance test

Perform in accordance with the provisions of MT/T 98.

5.4 Flame retardancy test

Follow the provisions of Appendices A through E.

5.5 Antistatic Test

Follow the provisions of Appendices F to H.

5.6 Weathering resistance test

The product samples were prepared according to the specifications in sections 5.4 and 5.5, and after aging at 70°C for 168 hours, the product was processed according to the specifications in sections 5.4 and 5.5. For water immersion testing... For testing, the sample should be immersed in tap water or purified water (pH 7.5±1) at room temperature for at least 5 times its volume, and the sample should be completely submerged.

Similarly, for pipes with a nominal diameter greater than 300mm, either the main body or a pipe of the same material and manufacturing process with a nominal diameter of 300mm or less can be used.

The simulated tube of any diameter was soaked for 24 hours, then removed and dried at 70°C for 6 hours. After removal, it was carried out in accordance with the provisions of 5.5.

5.7 Lead and Arsenic Limit Tests

Follow the provisions of Appendix I.

5.8 Smoke Density Performance Test

The test shall be conducted in accordance with the provisions of GB/T 8323.2, with the length and width of the sample block both being 75mm ± 1mm, and ignition shall be carried out under an irradiance of 25kW/m2.

In non-ignition mode, samples should be selected from parts that represent the characteristics of the product, and the test surface should be the original surface; for conveyor belts, samples with the skeleton removed should be taken.

Test the upper and lower cover rubber layers; if the cover rubber materials are different, they should be tested separately; for rubber hoses, test the outer rubber layer; products unsuitable for direct sample preparation.

It can be manufactured by splicing, stacking, crushing and then melting or injection molding, or by using the same raw materials to melt or coat. The process conditions should be... The sample preparation temperature should be similar to that of the product manufacturing process, and the thickness should preferably be the thickness of the product itself, but not exceeding 25 mm. Sample preparation conditions and any special requirements should be recorded.

Convention. Three samples were used for each ignition mode, and Ds(4) data were recorded. The average value was taken. For any single value exceeding the average, For a value of 50%, three additional test samples should be added, and the average of the six test data should be recorded.

5.9 Flue gas toxicity test

Using the samples from section 5.8, and in accordance with Appendix J, the products were tested under ignition and non-ignition modes at a radiation intensity of 25 kW/m². performance.

6.1 Inspection Classification

6.1.1 Factory Inspection

6.1.1.1 For the same product produced continuously using the same formula and process, each batch is considered to have been manufactured within 7 days; batches less than 7 days are also considered to have been manufactured within the specified time. Each batch should be processed according to regulations. Perform at least one factory inspection before leaving the factory.

6.1.1.2 The factory inspection items are as per Table 3.

6.1.2 Type Testing

6.1.2.1 Type test items are as per Table 3

6.1.2.2 Type testing shall be conducted under any of the following circumstances.

a) Trial production and type approval when new products or old products are transferred to another factory for production;

b) If, after formal production begins, significant changes occur in the structure, materials, or processes that may affect product performance;

c) When production resumes after a two-year hiatus;

d) When the factory inspection results differ significantly from the previous type inspection results;

e) When the relevant national authorities request type testing.

6.1.2.3 The test specimens for type testing shall be drawn from the products that have passed the factory inspection, and the number of samples shall meet the requirements for sample preparation for the product type testing items. need.

6.2 Judgment Rules

6.2.1 If all inspection items pass, the test is deemed qualified.

6.2.2 If any item fails to meet the standard, double the sample size shall be taken for retesting. If the retest is passed, the batch of products shall be deemed qualified; otherwise, it shall be deemed unqualified.

6.2.3 If two or more items fail, the item is deemed unqualified.

6.2.4 If any situation arises requiring early termination of the test, it should be recorded in detail, and the batch should be deemed unqualified.