Order of the Czech Mining Office No. 246 / 1996 Coll.
Order of the Czech Mining Office laying down more detailed conditions for the authorisation and checking of explosives, explosive articles and equipment for circulation
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Order
Effective from 01.11.1996
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246
DECLARATION
Czech Mining Office
of 13 August 1996
laying down more detailed conditions for the authorisation and checking of explosives, explosive articles and devices for circulation
According to § 24 paragraph 3 of the Act of the Czech National Council No. 61 / 1988 Coll., on Mining Activities, Explosives and State Mining Administration, as amended by the Act of the Czech National Council No. 542 / 1991 Coll.:
Preliminary provisions
Scope
(1) The Decree sets out more detailed conditions for the placing on the market of explosive articles and devices, as well as conditions for their checking, methods for verifying the essential requirements for the safety of explosives, unless they are laid down by harmonised Czech technical standards, and the detailed conditions and characteristics of explosives which may be used in risk conditions or risk environments, and checks on the characteristics of such explosives.
(2) The Decree does not apply to pyrotechnic articles which are pyrotechnic articles 1)
Basic concepts
For the purposes of this decree:
(a) an explosion (explosive transformation) of a physical or physico-chemical action resulting in sudden release of energy;
(b) a chemical explosion caused by exothermic chemical reactions without metabolism with the surrounding system;
(c) a detonation chemical explosion in which a detonation wave is produced in an explosive moving an explosive at a speed greater than that of sound in the detonation products of the reaction zone;
(d) by explosive combustion, a chemical explosion, the reaction zone of which is spread by the explosive at a speed less than the sound rate of the explosion-burning products in the reaction zone under the conditions to be created;
(e) explosive explosive which is characterised by detonation. The effects of pressure waves caused by detonation in an explosive environment are used,
(f) explosive explosive which is characterised by an explosive burn. The energy of gaseous crops is used to provide the movement of a missile, rocket or to generate gases for the propulsion of a special device,
(g) a high-sensitivity explosive with a rapid transition from ignition to detonation;
(h) explosive pyrotechnic compose the type of pyrotechnic composition whose explosive transformation takes place in the form of a very rapid explosion and which may endanger the safety of persons and property by explosion;
(i) igniting portable electrical equipment incorporating a source of electricity and for the initiation of electrical detonators;
(j) a rigorously secure igniter designed to perform electrical igniting in an environment where, under normal circumstances, the accumulation of an explosive mixture of gases, vapours or dust cannot be excluded;
(k) a portable electrical apparatus designed to measure resistance of igniting nets and ignited circuit in the process of blasting and to measure resistance of individual igniters;
(l) a rigorously safe ohmmeter for measuring resistance in an environment where, under normal circumstances, accumulation of explosive mixtures of gases, vapours or dust cannot be excluded;
(m) an isolation meter for operating measurements or for indicating the insulation status of the supply line;
n) an electrical device for checking essential safety and functional parameters of the igniters by testing the detonators;
o) indicator of the igniter function of a portable test tube intended to check the igniter directly at the workplace;
(p) a power supply cable used for the conductive connection of the igniter with the igniting grid of electrical detonators, possibly with the extension (s),
(r) an electric conduction line (s) used for the conductive connection of the supply line to the igniting grid of electrical detonators;
(s) the technical requirement to determine the characteristics of the product or the production methods involved.
Use of explosives in risk and risk conditions, closer conditions and checking
(1) A closer condition for the first use of an individual type of explosive under risk conditions or in a risk environment is compliance with the requirements set out in Annexes 1, 2 and 3.
(2) Authorisation for the first use of an individual type of explosive in a risk environment or in a risk condition2) may be issued after the manufacturer or importer (the applicant) has submitted to the Czech Mining Authority:
(a) evidence of conformity assessment with the essential safety requirements, 3)
(b) a technical dossier containing instructions for the use of the explosive, which shall include the particulars listed in Annex 1, the draft technical requirements, the basic technical parameters identifying the explosive and its qualitative characteristics; the technical requirements shall contain the information set out in Annex 2.
(3) The Czech Mining Authority shall examine the documentation referred to in paragraph 2 and, where appropriate, determine the scope of the additional official tests which can only be carried out by a person authorised to carry out conformity assessment activities in respect of explosives under a specific legislative regulation.4)
(4) The applicant shall provide the Czech Mining Authority with evidence of the conduct and results of any additional official tests, indicating whether the type of explosives meets the conditions laid down by specific legislation, 5) or harmonised Czech technical standards to ensure safety and health at work and safety of operations.
(5) The costs of taking samples of explosives for additional official tests and carrying out such tests shall be borne by the applicant.
More detailed conditions for the placing on the market of explosive articles and aids
(1) Only explosive articles may be placed on the market, (6) which have been verified by the Czech Office for the Testing of Weapons and Weapons, (7) that they comply with the requirements set out in Annexes 1, 2 and 3. The Czech Office for the Testing of Weapons and Ammunition will inform the Czech Mining Office and the person who requested the verification.
(2) Only aids may be placed on the market, (8) which have been verified by a person authorised to carry out conformity assessment activities in respect of explosives under a specific legislation, (9) that they comply with the requirements set out in Annexes 1, 2 and 3. The person authorised to carry out conformity assessment activities in respect of explosives under specific legislation shall inform the Czech Mining Authority and the person who requested verification of the result of the verification.
(3) Verification of the requirements for explosive articles and aids is requested and the costs of such verification are borne by whoever intends to place them on the market.
Distribution of explosives, igniters and pyrotechnic articles
Explosives are divided into explosives, ammunition, explosives and explosive pyrotechnic compounds. The distribution of explosives, detonators and pyrotechnic articles is set out in Annex 1, which is part of this Decree.
Basic parameters and their testing
(1) The basic parameters of explosives, explosive articles and explosive devices which apply to them must be included in the technical requirement. These parameters must be fulfilled throughout the period of use and are included in Annex 2, which is part of this Decree, including the method of testing.
(2) Only the mandatory procedure set out in Annex 3 which forms part of this Decree may be used for testing and checking the essential parameters of explosives, explosive articles and devices.
Test record
The record of tests carried out in accordance with Section 4 (2) shall include:
(a) the description and description of the product;
(b) the date of manufacture and, where appropriate, the serial number;
(c) the manufacturer,
(d) the date of the test;
(e) other information specified in the relevant mandatory procedure describing the conduct of the said test;
(f) evaluation and test result.
Transitional provision
Explosives, explosive articles and equipment authorised by the Czech Mining Office under the current regulations may be used after the date of application of this decree for five years.
Repeal
They shall be deleted:
1. The yield of the Central Mining Office No 7566 / 28 / 67 of 13 November 1967 authorising the use of electrical thermo-stable detonators TSR-2 (reg. 44 / 1968 Coll.).
2. The proceeds of the Czech Mining Office No 999 / 1 / 6 / 70 of 3 August 1970 authorising the use of pneumatic ejector stuffing equipment in ČSR, marked with a blow gun ZP 1 and ZP 2 (reg. 7 / 1971 Coll.).
3. The proceeds of the Czech Mining Authority No 17 / 1976 Ú. v. ČSR of 19 July 1976 No 4418 / 25 / 1976, which is authorised to use explosives for special purposes marked SEMTEX S 35 (reg. 25 / 1976 Coll.).
4. The proceeds of the Czech Mining Office No. 18 / 1976 Ú. v. ČSR of 19 July 1976 No 4419 / 26 / 1976, which is authorised to use explosives for special purposes marked SEMTEX S 30 (reg. 25 / 1976 Coll.).
5. The proceeds of the Czech Mining Office No 20 / 1976 Ú. v. ČSR of 19 July 1976 No 4421 / 27 / 1976 authorising the use of explosives for special purposes marked SEMTEX S 25 (reg. 25 / 1976 Coll.).
6. The proceeds of the Czech Mining Authority No 22 / 1976 Ú. v. ČSR of 19 July 1976 No 4384 / 10 / 1976, which is authorised to use the mining rock explosive marked DANUBIT GEOFEX 2 (reg. 25 / 1976 Coll.) in the blasting works.
7. The proceeds of the Czech Mining Office No. 23 / 1976 Ú. v. ČSR of 19 July 1976 No 4385 / 11 / 1976, which is authorised to use the mining rock explosive marked DANUBIT 1 (reg. in the amount of 25 / 1976 Coll.).
8. The proceeds of the Czech Mining Office No. 30 / 1976 Ú. v. ČSR of 19 July 1976 No 4392 / 18 / 1976, which is authorised to use the demo-N electric millisecond detonators with the Cu cavity (reg. 25 / 1976 Coll.) in the blasting works.
9. The proceeds of the Czech Mining Office No. 32 / 1976 Ú. v. ČSR of 19 July 1976 No 4394 / 20 / 1976, which is authorised to use the timed (semi-second) DeP-N with Cu cavity (reg. 25 / 1976 Coll.) during the blasting works.
10. The proceeds of the Czech Mining Office No. 33 / 1976 Ú. v. ČSR of 19 July 1976 No 4395 / 21 / 1976, which is authorised to use the time (half-second) DeP-N with Al-cavity (reg. 25 / 1976 Coll.) during the shredding works.
11. The proceeds of the Czech Mining Office No 34 / 1976 Ú. v. ČSR of 19 July 1976 No 4396 / 22 / 1976, which is authorised to use the dem-N electric millisecond detonators with an Al cavity (reg. 25 / 1976 Coll.).
12. The proceeds of the Czech Mining Office No. 7 / 1978 Ú. v. ČSR of 31 January 1977 No. 22 / 1 / 1977, which is authorised to use PERUNIT 20 mining rock explosives in the blasting works (reg. 28 / 1978 Coll.).
13. The proceeds of the Czech Mining Office No. 10 / 1978 Ú. v. ČSR of 31 January 1977 No. 25 / 4 / 1977, which is authorised to use the surface explosives PERMON EXTRA 9 (reg.
14. The proceeds of the Czech Mining Authority No 18 / 1978 Ú. v. ČSR of 31 January 1977 No 27 / 6 / 1977, which is authorised to use the surface explosive material VESUVIT TN (reg. 28 / 1978 Coll.) in the blasting works.
15. The proceeds of the Czech Mining Authority No 19 / 1978 Ú. v. ČSR of 31 January 1977 No 28 / 7 / 1977, which is authorised to use SEMTEX 1A surface explosive (reg. In the amount of 28 / 1978 Coll.).
16. The proceeds of the Czech Mining Office No 21 / 1978 Ú. v. ČSR of 31 January 1977 No 30 / 9 / 1977, which is authorised to use the surface explosives PERMON DAP 1 (reg.
17. The proceeds of the Czech Mining Office No. 32 / 1978 Ú. v. ČSR of 3 March 1978 No 571 / 1 / 1978, which is authorised to use electric detonators DeM-S- Cu (reg. 32 / 1978 Coll.) in the blasting works.
18. The proceeds of the Czech Mining Office No. 34 / 1978 Ú. v. ČSR of 30 January 1978 No. 572 / 2 / 1978, which is authorised to use electric detonators DeM-S-Al (reg. in the amount of 32 / 1978 Coll.).
19. The proceeds of the Czech Mining Authority No. 36 / 1978 Ú. v. ČSR of 3 March 1978 No 515 / 24 / 1977, which is authorised to be used in the blasting works of the lightning works Np VII (reg. in amount 32 / 1978 Coll.).
20. The proceeds of the Czech Mining Office No. 37 / 1978 Ú. v. ČSR of 3 March 1978 No 514 / 23 / 1977, which is authorised to be used in the blasting works of the lightning works Np VI (reg. in amount 32 / 1978 Coll.).
21. The proceeds of the Czech Mining Office No. 1 / 1979 Ú. v. ČSR of 23 October 1978 No 5883 / 12 / 1978 concerning the authorisation to use the electric detonators DeD-S / Cu (reg. in the amount of 3 / 1979 Coll.).
22. Proceeds of the Czech Mining Office No. 2 / 1979 Ú. v. ČSR of 24 October 1978 No 5884 / 13 / 1978 concerning the authorisation to use the electric detonators DeD-S / Al (reg. in the amount of 3 / 1979 Coll.).
23. The proceeds of the Czech Mining Office No 3 / 1979 Ú. v. ČSR of 25 October 1978 No 5885 / 14 / 1978 concerning the authorisation to use the electric detonators DeP-S / Cu (reg. in the amount of 3 / 1979 Coll.).
24. The proceeds of the Czech Mining Office No. 4 / 1979 Ú. v. ČSR of 26 October 1978 No 5886 / 15 / 1978 concerning the authorisation to use the electric detonators DeP-S / Al (reg. in the amount of 3 / 1979 Coll.).
25. The proceeds of the Czech Mining Office No. 6 / 1979 Ú. v. ČSR of 5 March 1979 No 1120 / 5 / 1979 concerning the authorisation to use the electric detonators Dem-zb-S (reg. in amount 12 / 1979 Coll.).
26. The proceeds of the Czech Mining Office No 7 / 1979 Ú. v. ČSR of 6 March 1979 No 1121 / 6 / 1979 concerning the authorisation of use of electric detonators DeR-S (reg. in amount 12 / 1979 Coll.).
Efficacy
This Decree shall take effect on 1 November 1996.
Chairman:
Ing. Bartoš v. r.
Příloha č. 1
Annex No 1 to Decree No. 246 / 1996 Coll.
DISTRIBUTION OF EXPLOSIVES, DISTRIBUTIONS AND PYROTECHNICAL PRODUCTS
Distribution of explosives
1. Explosives are divided according to the area of application into industrial and military.
2. Industrial explosives are explosives intended for use mainly in the blast technology in various industries.
According to the method of use, it is divided into:
(a) superficial
(b) mining
(c) for specific uses.
Mine explosives are divided into mine rock and mine-safe. It is strictly safe to divide into dust and gas. Strictly safe gas is divided into categories I, II and III.
3. Surface explosive is an industrial explosive intended exclusively for work in surface workplaces.
4. Mine explosive is an industrial explosive intended for underground use. It can also be used on the surface.
5. The mine rock explosive is a mine explosive that is not safe against the ignition of explosive gases or explosive mixtures of dust and air.
6. A highly safe explosive is a mine explosive that shows a degree of safety against the ignition of explosive gases or explosive mixtures of dust with air or mixtures of explosive gases and dust.
7. A thoroughly safe anti-dust explosive is a thoroughly safe explosive that shows a degree of safety against the ignition of explosive mixtures of coal dust with air.
8. A strictly safe gas-proof explosive is a mine-safe explosive that shows a degree of safety against the ignition of explosive mixtures of methane with air and coal dust with air.
9. Explosive material for special use is intended to be used in blast work under pressure, underwater, geoseismic exploration and other special work.
Shell distribution
1. According to the area of use, ammunition is divided into civil and military.
2. The ammunition is divided into free cash, solid fuel, liquid fuel and ammunition to generate gases to drive special devices.
3. Non-volatile dust is a material containing, as a general rule, gelatinised nitrocellulose and stabiliser, which may also contain an energy gelatinator, plasticiser, explosive heat enhancers, inorganic additives, etc.
4. According to the contents of the components which carry explosive properties, the free money is divided into one component, two component and multiple components.
5. Single-component non-volatile money is one where the source of explosive properties is nitrocellulose gelatinised without the use of an energy gelatinator.
6. Two-component free cash is the one where the source of explosive properties is nitrocellulose gelatinised with an energy gelatinator (a nitrous ester of multipotent alcohol).
7. According to the shape of the dust element, the free money is divided into tabular, strip, roller, tube, single-bore, multi-hole and spherical.
Distribution of detonators and pyrotechnic articles
1. The ignites are divided into basic and auxiliary.
2. Basic igniters are devices used to ignite explosives where the initial stimulus is different from the working characteristics.
3. Auxiliary ignitators are devices used to ignite explosives for which the initial stimulus is consistent with the working characteristics.
4. Pyrotechnic articles are divided into explosive articles and pyrotechnic articles (1).
Příloha č. 2
Annex No. 2 to Decree No. 246 / 1996 Coll.
ESSENTIAL PARAMETERS OF EXPLOSIVES, EXPLOSIVE SUBJECT MATTERS AND ELEMENTS FOR USE OF EXPENSES AND ELIGIBLE TESTING
Explosives
Explosives
(1) The chemical composition of industrial explosives (hereinafter referred to as explosives) shall correspond to the composition indicated in the technical requirement of the explosive for which the authorisation for placing into circulation has been issued.
All components must be mixed evenly throughout the volume.
The content of each component of industrial explosive shall be determined by appropriate analytical methods as specified in the technical requirement.
2. Explosives are manufactured and delivered according to technical requirement
(a) in cylinder shaped brackets
(b) moulded to another geometric shape (e.g. prisms, plates)
(c) directly stuffed in sacks or other containers
The diameter of the small-diameter label, i.e. the 50 mm diameter, may be within tolerances (+ 2 mm, -1 mm) from the nominal diameter, the large-diameter label diameter, i.e. 50 mm diameter or more, may be within tolerances ± 15% of the nominal diameter.
The mass of the small-diameter label shall be within ± 5 per cent of the rated weight, the mass of the large-diameter label shall be within ± 15 per cent of the rated weight.
The diameter of both small and large diameter charges shall be checked for at least 10 charges by means of a sliding scale. The diameter shall be measured approximately half the length of the label after its previous manual adjustment into a circular shape. As a result of the test, the arithmetic mean of the measured values of the charges shall be given.
The mass of the charges shall be checked for at least 20 charges by weighing to the nearest 1 g for charges of up to 1 kg or to the nearest 10 g for charges of over 1 kg. As a result of the test, the arithmetic mean of the measured values of the load masses shall be given.
In the case of a group pack of small-diameter charges, weigh to the nearest 10 g enough packages to contain at least 20 individual charges. As a result of the test, i.e. the weight of each label, the weight of the package and the number of charges shall be given.
3. the explosive density, the bulk mass of the bulk explosive and the bulking mass of the label shall not differ from the values specified in the technical requirement.
The density of the loaded explosive shall be determined in accordance with the Binding Procedure 1 set out in Annex 3 to this Decree, of the dimensions and weight of the explosive sticker with the face cut off and the packaging removed.
The volume mass shall be determined in accordance with Binding Procedure 2 set out in Annex 3 to this Decree by immersing the label into a known volume of water presented in a measuring cylinder. The weight of the label and the increase of the total volume shall be calculated by volume (method A). If the geometric shape of the label does not allow the use of method A, the volume shall be calculated from the dimensions of the label and the volume and weight thus determined shall be calculated by volume (method B).
The bulk mass of non-encrusted bulk explosives shall be determined by weighing the pre-determined explosive volume according to the Binding Procedure 2 set out in Annex 3 to this Decree.
4. Unless otherwise specified in the official tests, explosives shall be distinguished by the colour marking of the masses and packages, stickers or tags (hereinafter referred to as packaging) as follows:
| Trhavina | Barevné označení | |||
|---|---|---|---|---|
| masy | obalů | |||
| povrchová | je předepsáno v | žluté | ||
| důlní skalní | červené, nevztahuje se na typu | červené | ||
| důlně bezpečná | protiprachová | modré | modré | |
| protiplynová kategorie | I. | bílé | bílé | |
| protiplynová kategorie | II. | zelené | zelené | |
| protiplynová kategorie | III. | zelené | zelené s černým pruhem | |
| pro zvláštní použití | je předepsáno technickým požadavkem dané | |||
It is essential that the labelling on the packaging is clear and legible until the explosive is consumed.
The colour marking of the packages shall be checked for stickers, inner packaging and stickers or labels of the shipping package.
5. The effluent on the surface of the loaded explosive shall not compromise safety at work.
When determining effusion, qualitative tests shall determine whether effusion is caused by the hygroscopic properties of certain components of the explosive or by the excretion of liquid nitroesters of multi-potent nitric acid alcohols or liquid aromatic nitrites.
The tests shall be carried out on three randomly selected charges in accordance with Binding Procedure 3 set out in Annex 3 to this Order.
6. The explosive shall detonate reliably and fully over the whole length of the charge at the average of the charge specified in the technical requirement.
Detonation capability is determined when initiating a uniform action, either by a PCB consisting of a pentritol body, detonator No 3 or detonator No 8. The complete detonation shall be determined from a trace on the ground, which shall be visible over the whole length of the charge. The test shall be carried out on three samples in accordance with Binding Procedure 4 set out in Annex 3 to this Decree.
The determination of the lower limit mean shall be carried out in accordance with the Binding Procedure 5 set out in Annex 3 to this Decree. When determining the lower charge limit diameter, the smallest explosive charge diameter shall be determined when detonation is still carried out in a stable manner. The determination shall be carried out with an explosive introduced into the glass tubes with graduated internal diameters. The lower limit mean of the explosive at a given density shall be the smallest diameter at which the full detonation of the charge occurs in three tests.
7. The explosive shall show the effect of the values specified in the technical requirement.
Determination of effect:
(a) When determining the effect according to Trauzle, an aneurysm whose value in cm3 expresses the effect of the test explosive shall be formed in the lead cylinder by introducing an explosive of the prescribed mass to detonation. The test shall be carried out on three samples in accordance with Binding Procedure 6 set out in Annex 3 to this Decree.
(b) In determining the relative working capacity in a ballistics device, the deflection in mm of a 10 g charge shall be detected from five detonators. The mass of the comparator explosive corresponding to the arithmetic mean of the deflection of the vent shall be determined from the calibration curve. This mass, multiplied by 10, indicates the relative working capacity of the explosive as a percentage (see Binding Procedure 7 in Annex 3 to this Decree).
(c) In determining the brisance by a lead roller, the tested explosive, adjusted to the shape of the label, shall be placed on the test lead roller and initiated by detonator No 8. The brisket of explosives is expressed in mm by compression of the cylinder. The test shall be carried out on three samples in accordance with Binding Procedure 8 set out in Annex 3 to this Decree.
8. The explosive shall have the capability to transmit detonation from one marker to another. The maximum size of the air gap between the cartridges is specified in the technical requirement as the value of detonation transmission.
The determination of the transfer of detonation shall be carried out on a wooden support in accordance with the Binding Procedure 9 set out in Annex 3 to this Decree.
9. It is essential that the explosive is sufficiently insensitive to mechanical stimuli (impact, friction).
The determination of the sensitivity to impact shall be carried out in accordance with the Binding Procedure 10 set out in Annex 3 to this Decree, the determination of the sensitivity to friction according to Binding Procedure 11 set out in Annex 3 to this Decree.
10. The detonation rate of the explosive shall not differ from the values specified in the technical requirement.
The detonation rate of the explosive is determined either by the method of measuring the time needed to pass the detonation wave between two sensors, or by the continuous method using the resistance probe, or by the method of Dautrich using the lightning circuit. The time measurement method is an arbitrator's test, the continuous method is used in the verification of the detonation process, the method using the lightning circuit is informative. The test shall be carried out on three samples in accordance with the Binding Procedure 12 set out in Annex 3 to this Decree.
11. It is necessary that chemical stability, as specified in the technical requirement, should be exposed throughout the period of consumption.
During the test of chemical stability according to the Binding Procedure No 13 set out in Annex 3 to this Decree, the thermal exposure period shall be determined in minutes in which the iodostarch paper shows a discoloration indicating degradation. Two parallel determinations are made.
12. Explosives intended for underwater use must show resistance to the water pressure for which they are intended.
Determination of water resistance.
In determining the degree of resistance to water in accordance with the Binding Procedure 14 set out in Annex 3 to this Decree, the test samples - unmodified and modified by longitudinal cuts - shall be inserted into the steel water container where they are subjected to the action of water at the prescribed pressure and for the prescribed time. After removal, the samples shall be tested for complete detonation in accordance with the procedure referred to in paragraph 6.
In order to be classified in a degree of resistance corresponding to the test conditions, complete detonation is necessary in three unmodified and three modified samples. The parameters of the permitted water exposure, i.e. water pressure and the time required by the explosive technical requirement, shall be verified in accordance with the procedure laid down in Binding Procedure 15 set out in Annex 3 to this Decree. It is necessary to detonate at a specified water pressure after a specified time of exposure to the explosive in six consecutive attempts.
13. Unless otherwise specified in the official tests, the mine explosive in the explosion shall not release more toxic residues than 50 1.kg-1 in conversion to carbon monoxide.
When determining the toxic gaseous residues of the explosion in accordance with the Binding Procedure 16 set out in Annex 3 to this Decree, the explosive shall be produced by an explosion in the test chamber.
After chilling of the crops, samples shall be taken to determine the carbon monoxide and nitrogen oxides content as NO2 or, where appropriate, the hydrogen sulphide content according to the Binding Procedure 17 set out in Annex 3 to this Decree.
14. The limit charge of a mine-safe dust explosive shall not cause a mixture of coal dust to ignite with air of 300 g / m-3
The limit charge of a mine-safe gas explosive shall not cause an explosive mixture of methane to be ignited with an air concentration between 8,5 and 9,5% vol and coal dust with an air concentration of 300 g.m-3
Mine security shall be determined in accordance with Binding Procedure 18 set out in Annex 3 to this Order.
The test explosive shall be detonated under the prescribed conditions. It shall be ascertained whether or not an explosion in the blast chamber of the test chambers has exploded an explosive mixture of methane with air or coal dust with air filling the chamber space.
15. It is essential that the Category II and III high-level protective gas explosives show a certain level of resistance to deflagration.
Resistance to the deflagration of rigorously safe anti-gas explosives shall be tested in accordance with the Binding Procedure 19 set out in Annex 3 to this Decree. It is required that the explosive does not show deflagration in 11 consecutive attempts with an escape nozzle of 3,5 mm in diameter for Category II explosives and an escape nozzle of 2 mm in diameter for Category III explosives.
16. The explosive must be sufficiently insensitive to heat stimuli.
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Regulation Information
| Citation | Order of the Czech Mining Office No. 246 / 1996 Coll., laying down more detailed conditions for the authorisation and checking of explosives, explosive articles and devices for circulation |
|---|---|
| Regulation Type | Order |
| Author | - |
| Collection | Code of Laws |
| Date of Promulgation | 20.09.1996 |
|---|---|
| Effective from | 01.11.1996 |
| Effective until | - |
| Status | Valid |
The regulation text is for informational purposes only.
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