This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of small diameter explosives. This standard is applicable to industrial explosives with a diameter of less than 30 mm for open-pit mining, coal mining and full-face blasting projects. MT/T 931-2005 Technical conditions for small diameter explosives MT/T931-2005 Standard download decompression password: www.bzxz.net

ICS 71.100.30
Registration No.: 15488—2005
Coal Industry Standard of the People's Republic of China
MT/T 931—2005
Technique qualification of small diameter tube explosive2005-03-19 Issued
National Development and Reform Commission
2005-06-01 Implementation
1 ScopeWww.bzxZ.net
Technical qualification of small diameter tube explosive
MT/T931—2005
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of small diameter tube explosives. This standard applies to industrial explosives with a tube diameter of less than 30 mm for open-pit mining and full-section blasting projects in coal mines. Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all referenced documents with dates, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all referenced documents without dates, the latest versions are applicable to this standard. GB/T7968 Paper bag paper
GB/T8031 Industrial electric detonator
GB/T10111
GB/T12436
GB/T12440
GB/T13228
GB/T13230
Method of random sampling using random numbers Lead method for explosive performance test
Lead cylinder compression method for explosive intensity test
Method for measuring detonation velocity of industrial explosives
Industrial fire detonator
GB14493—200 3 Packaging of industrial explosives
Classification and naming rules of industrial explosives
GB/T17582
GB18097
Test method and judgment of combustible gas safety of permissible explosives for coal minesGB18098
Determination of toxic gas content after explosion of industrial explosivesMT378 Determination method and judgment rules of anti-deflagration property of explosives for coal minesMT/T932-2004 Determination of density, moisture and explosion distance of industrial explosives3 Classification and naming
Small diameter cartridge explosives are mainly divided into three types according to their use: rock, permissible for coal mines and open-pit. Small diameter cartridge rock explosives are suitable for blasting projects without underground combustible gas and (or) coal dust explosion hazards. Small diameter cartridge coal mine permitted explosives are suitable for blasting projects with underground combustible gas and (or coal dust explosion hazards. Small diameter cartridge open-air explosives are suitable for open-air blasting projects. 3.2
2 Naming
The naming of small diameter explosives shall comply with the provisions of GB/T17582. 4 Requirements
The main performance indicators of small diameter cartridge explosives shall comply with the requirements of Table 1. Test method
Determination of cartridge density
According to the provisions of MT/T932-2004
MT/T931-2005
Density of cartridge
Explosive density
Sympathetic detonation distance
Working capacity
Explosion extinguishing diameter
Anti-gap effect
Anti- Water performance
Toxic gas content after explosion
Combustible gas safety
Anti-explosion
Impact sensitivity
Friction sensitivity
Thermal sensitivity
Guarantee period
Table 1 Main performance indicators of small diameter cartridge explosives
Rock explosives
Nominal value ±0.05
Nominal value ±0.05
≥3.1×103
Permitted explosives for coal mines
Nominal value ±0.05
Nominal value ±0.05
≥2.5×103
Comply with the provisions of the corresponding product standards
Comply with the provisions of the corresponding product standards
Open-air Explosive
Nominal value ±0.05
Nominal value ±0.05
≥2.5×103
Detonation length in seamless steel pipe with inner diameter $32mm is not less than 2m. After soaking in 98kPa water pressure for 2h, it can completely detonate≤80
Meet the requirements of relevant product standards
Meet the requirements of relevant product standards
Meet the requirements of relevant product standards
Note 1: The numbers in the table are valid within the warranty period, which is calculated from the date of completion of the manufacture of the explosive; Note 2: The density, water resistance and thermal sensitivity of explosives are only for emulsion explosives and water gel explosives. 5.2 The determination of the density of explosives
shall be carried out in accordance with the provisions of MT/T932-2004.
5.3 Determination of explosion distance
Perform according to the provisions of MT/T932-2004.
Note: The diameter of the round rod is the same as the diameter of the charge roll. 5.4 Determination of explosion velocity
Perform according to the provisions of GB/T13228.
Note: The temperature of the water-containing explosive sample should not be lower than 5℃. If the sample temperature is lower than 5℃, heating measures should be taken, but the temperature increase should not exceed 25℃. 2
5.5 Determination of intensity
Perform according to the provisions of GB/T12440
MT/T931-2005
Note: The temperature of the water-containing explosive sample should not be lower than 5℃. If the sample temperature is lower than 5℃, heating measures should be taken, but the temperature increase should not exceed 25℃. 5.6 Determination of working capacity
Perform according to the provisions of GB/T12436.
Note: The temperature of water-containing explosive samples should not be lower than 5℃. If the sample temperature is lower than 5℃, heating measures should be taken, but the temperature increase should not exceed 25℃. 5.7 Determination of the extinction diameter
5.7.1 Tools and materials
a) Ruler: graduation value 1mm;
b) Aluminum plate: 600mmX80mmX4mm;
c) 80g paper bag paper: in accordance with the provisions of GB/T7968; d) No. 8 detonator: in accordance with the provisions of GB/T8031 or GB/T132305.7.2 Procedure
5.7.2.1 Use paper bag paper to roll into a paper tube with the size shown in Figure 1 on the mold. The thickness shall not exceed three layers. Fill the paper tube with the explosive to be tested, and the density shall be controlled within the range of the original density of the sample. The charge is placed on the aluminum plate. Tie the two ends firmly with a thin wire, and insert a detonator into the large end of the charge, with the insertion depth being about 2/3 of the length of the detonator. 2 After detonation, use a ruler to measure the length of the burst mark on the aluminum plate, accurate to 1mm. 5.7.2.2
5.7.3 Expression of results
Calculate the extinction diameter of the explosive according to the following formula:
Where d.—explosion diameter of the explosive, in millimeters (mm); d1—diameter of the large end of the charge, in millimeters (mm); d2—diameter of the small end of the charge, in millimeters (mm); l—length of the burst mark on the aluminum plate, in millimeters (mm); L—total length of the charge, in millimeters (mm). 570
-(d.-d,)
Measure twice in parallel, take the average value, accurate to 1mm, and the difference between the two results should not exceed 3mm. If the parallel measurement is out of tolerance, an additional measurement can be made and the following treatment shall be performed:
a) If the additional measurement result is within the tolerance of the previous two results, the average of the three results shall be taken; b) If the additional measurement result is within the tolerance of only one of the previous two results, the average of the two results shall be taken; c) If the additional measurement result is out of tolerance of both the previous two results, the sample shall be re-measured. 5.8 Determination of anti-gap effect
5.8.1 Materials
a) Seamless steel pipe: inner diameter g32mm, wall thickness 23mm, length 2.4m; 3
MT/T931—2005
b) No. 8 detonator: in accordance with the provisions of GB8031 or GB/T13230. 5.8.2 Procedure
5.8.2.1 Place the steel pipe with one end closed by a steel plate horizontally, and load the explosive rolls into the steel pipe in sequence. There shall be no gaps between the cords, and the length of the charge shall be 2m. Insert the detonator at the end of the charge, and then plug it with sealing material. 5.8.2.2 After detonation, determine the detonation length of the charge based on the length of the remaining steel tube. 5.8.3 Expression of results
Measure twice in parallel, and each charge shall be fully detonated. 5.9 Determination of water resistance
5.9.1 Materials
No. 8 detonator: in accordance with the provisions of GB/T8031 or GB/T13230. 5.9.2 Procedure
5.9.2.1. Open the seal at one end of the drug roll and place it in a water tank filled with room temperature water. Keep the drug roll under 98kPa pressure for 2 hours. Then take it out. Insert the detonator into the open end of the drug roll. The insertion depth is about 2/3 of the detonator length. 5.9.2.2 After detonation, if there is no residual explosives on the scene and a blast pit is produced where the explosive drug roll is placed, it is determined that the drug roll is completely detonated. 5.9.3. Expression of results
Parallel measurements are performed twice, and the tested drug rolls should all be completely detonated. 5.10
Determination of toxic gases after the explosion of explosives
Carry out in accordance with the provisions of GB18098.
5.11 Inspection of the safety of combustible gas
Carry out in accordance with the provisions of GB18097.
2 Inspection of anti-deflagration
Carry out in accordance with the provisions of MT378.
5.13 Determination of impact sensitivity
Carry out in accordance with the provisions of the corresponding product standards.
5.14 Friction sensitivity measurement
Thermal ... d)
6.3.2 Inspection items
Type inspection items are all items specified in Table 1. 4
3 Sampling
Samples are randomly selected according to the method specified in GB/T10111, and the total amount of samples drawn should not be less than 16kg. 6.3.4 Judgment rules and re-inspection rules
When all the inspected items meet the requirements of this standard, they are judged as qualified. MT/T 931—2005
If any of the three indicators of toxic gas content after explosion of explosives, combustible gas safety, and anti-explosion performance do not meet the requirements of this standard, they are judged as unqualified.
If the test results of two or more (excluding two) of the twelve items of the density of the cartridge, the density of the explosive, the detonation velocity, the detonation distance, the intensity, the working capacity, the extinguishing diameter, the anti-gap effect, the water resistance, the friction sensitivity, the impact sensitivity and the thermal sensitivity do not meet the requirements of this standard, the test is considered unqualified. If the test results of one or two items do not meet the requirements of this standard, the items that do not meet the requirements shall be doubled for re-test. If the re-test results meet the requirements of this standard, the test is still considered qualified, otherwise it is considered unqualified. Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall comply with the provisions of GB14493-2003. 5
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