MT 61-1997 English PDF

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MT 61-1997: Test method and judge rules of safety of permissible explosive for coal mining in firedamp
Status: Obsolete

MT 61: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
MT 61-1997	279	Add to Cart	3 days	Test method and judge rules of safety of permissible explosive for coal mining in firedamp	Obsolete
MT 61-1982	RFQ	ASK	3 days	(Chinese Industry Standard)	Obsolete

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Basic data

Standard ID: MT 61-1997 (MT61-1997)
Description (Translated English): Test method and judge rules of safety of permissible explosive for coal mining in firedamp
Sector / Industry: Coal Industry Standard
Classification of Chinese Standard: G89
Classification of International Standard: 71.100.30
Word Count Estimation: 7,720
Date of Issue: 12/12/1997
Date of Implementation: 2/1/1998
Older Standard (superseded by this standard): MT 61-1982
Quoted Standard: GB/T 8031-1987; GB/T 15663.8-1995; GB/T 15663.9-1995
Regulation (derived from): State Administration of Work Safety & Supervision Notice 2014 No. 7
Summary: This standard specifies the permissible explosives underground coal mine gas safety grade, scope, test methods and decision rules. This standard applies to coal permissible explosives.

MT61:

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method and judge rules of safety of permissible explosive for coal mining in firedamp People's Republic of China Coal Industry Standard MT/T 61-1997 Test method and judging rules of coal mine allowable explosives underground gas safety degree 1997-12-12 ratified 1998-02-01 implemented Approved by the Ministry of Coal Industry of the People's Republic of China

Contents

1 Scope 1 2 Normative references 1 3 Terms and symbols 1 4 Coal Mine Permissible Explosive Gas Safety Level and Application Scope 1 5 Test method 2 6 Judgment Rule 4 Gas safety of coal mine permitted explosives Test methods and judgment rules

1 Scope

This standard specifies the safety level, applicable scope, test methods and judgment rules of the combustible underground explosives in coal mines. This standard applies to permitted explosives in coal mines.

2 Reference standards

The following standards contain provisions that, through reference in this standard, constitute provisions of this standard. When this standard was published, the editions shown were all Is effective. All standards will be revised, and all parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 8031-87 industrial electric detonator GB/T 15663.8-1995 terminology of coal mine technology GB/T 15663.9-1995 coal mine scientific and technological terms explosive materials and blasting technology

3 terms and symbols

3.1 Terminology This standard uses the following terms 3.1.1 Sample mean Under the specified conditions, the explosive probability is 50%. 3.1.2 interval The absolute value of the difference between two adjacent test levels. 3.1.3 Up-and-down method An experimental design method for finding the average of a single factor random variable 3.1.4 excess nitrogen nitrogen Nitrogen content in downhole combustible gas that exceeds the normal atmospheric nitrogen-to-oxygen ratio 3.2 Symbols

4 Coal Mine Permissible Explosive Gas Safety Level and Application Scope

The coal mine's permissible explosive gas safety level is divided into three levels, which are one, two, and three in turn. See Table 1 for the standard ignition value (m50) of half of the ignition levels at each level.

1 Downhole flammable gas safety level and applicable scope of coal mine permitted explosives

5 Test method

5.1 Method summary Under the specified conditions, the small sample lift method was used to explode the test explosive in the mortar hole of the mortar. According to the test tunnel The result of gas-air mixed gas ignition, half of the amount of ignition is calculated, so as to determine the underground gas safety of explosives. 5.2 Materials 5.2.1 Underground flammable gas for test. Must use underground coal flammable gas approved by the Ministry of Coal Industry. When testing, when methane concentration When it is 9.0%, the sum of the contents of other combustible gases shall not be greater than 0.3%, and the sum of the contents of carbon dioxide and excess nitrogen shall not be greater than 1.0%. 5.2.2 Allowable transient power detonators for coal mines shall meet the requirements of GB/T 8031. 5.3 Apparatus and equipment 5.3.1 Device The underground gas safety test device is shown in Figure 1.It is mainly composed of test tunnels, gas mixing pipelines, firing mortars, mixed ventilators, and smoke exhaust ducts. Fan and control system. 1-test tunnel; 2-extension chamber; 3-closed device; 4-explosion chamber; 5-measurement hole; 6-launch mortar; 7- smoke exhaust fan; 8-exhaust pipe; 9-intake pipe; 10-mixed fan; 11-return pipe; 12-combustible pipe; 13-valve

1 Schematic diagram of underground gas safety test device

b) The gas mixing pipe is composed of an intake pipe, a return pipe and a control valve. The air intake pipe is introduced near the closed end of the explosion chamber and returns to the air. The pipe is led out from the lower part near the open end of the explosion chamber, and valves should be installed on the intake and return lines respectively; c) The firing mortar is a steel cylinder, which is composed of an inner cylinder and a jacket. The inner cylinder is convex, is covered with a sealing rubber pad, and has a gun hole in the center axis. outer Ordinary carbon steel can be used as the sleeve material, and PNi3CrMoV gun steel should be used as the inner material. 138 ± 10) mL. 5.3.2 Instrument a) Methane detector. the division value should not be greater than 0.02%; b) Thermometer. The division value should not be greater than 1C; c) Hygrometer. The division value should not be greater than 1%; d) Balance. the sense should be no more than 1g. 5.4 Test conditions 5.4.1 The sample is made of explosive raw material roll. When weighing samples, take the full weight. The drug temperature should be (20 ± 10) ° C. 5.4.2 In the downhole combustible-air mixed gas in the explosion chamber, the methane concentration is (9.0 ± 0.3)%, the temperature is (20 ± 10) ° C, and the humidity should not be greater than 80%. 5.4.3 The reaming rate of firing mortars shall not exceed 25%. 5.5 Test procedure 5.5.1 The dose of each test is determined according to 6.1. 5.5.2 Before each test, the air tightness of the methane detector should be checked and the zero point calibrated. 5.5.3 Close the open end of the explosion chamber with a kraft paper or plastic film with a closing device. 5.5.4 Insert the detonator into one end of the sample, the insertion depth should not be less than 2/3 of the length of the detonator, and use a wooden cannon to load the sample into the firing mortar hole. Bottom, reverse detonation. 5.5.5 Push the firing mortar to the closed end of the explosion chamber and compact it so that the boss enters the round end of the closed end, and its end face is flush with the inner wall of the closed end. 5.5.6 Turn on the mixed ventilator, fill the explosion chamber with downhole combustible gas, and measure the temperature, humidity and methane concentration of the mixed gas. 5.5.7 When the methane concentration reaches the requirements, stop inflation. Mix 1 Min, close the mixing fan and related valves, and open the pressure relief valve. 5.5.8 Connect the detonation line and detonate within 2 minutes after the hybrid fan is turned off. 5.5.9 Check whether the tested explosive is fully explosive. If it is not explosive or semi-explosive, this test is invalidated and the level test is repeated. 5.5.10 Use the sound of explosion or other parameters to determine whether the mixed gas ignites and make a record. 5.5.11 Turn on the smoke exhaust ventilator, at the same time open the inlet valve of the mixed ventilator, turn on the mixed ventilator, and eliminate the cannon smoke in the tunnel. 5.5.12 Reset each valve to the initial state of the test.

6 Decision rules

6.1 Test design 6.2 Test records The test results are recorded in the format shown in Table 2. "Ignite" is recorded as "1", "Unignited" is recorded as "0".

2 Small sample lifting method test records

The "X" of the 7th test level in Table 2 is fictitious based on the results of the 6th test, that is, the "ignition" of the 6th test, a step is lowered, and a step is increased on the contrary. 6.3 Data processing After confirming the test results, calculate the half ignition amount by the following formula, and round the final result to a few digits. ......

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