Circular No. 14/2015/TT-BCT Issuing National Technical Regulations on Electric Blasting Machines

CIRCULAR

Issued Article 24national technical regulation on Electric Blasting MachinesFor power plants invested under the Build-Operate-Transfer (BOT) model, n is determined according to the operational period of the power plant stipulated in the BOT contract.

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Pursuant to Decree No. 95/2012/NĐ-CP dated November 12, 2012, of the Government, detailing the functions, tasks, powers, and organizational structure of the Ministry of Industry and Trade;

Pursuant to the Law on Standards and Technical Regulations dated June 29, 2006;

Based on Decree No. 132/2008/NĐ-CP dated December 31, 2008 of the Government detailing implementation of certain provisions

Pursuant to the proposal of the Director of the Science and Technology Department,

The Minister of Industry and Trade promulgates the National Technical Regulation on Electric Blasting Machines.

Article 1. This Circular issues the "National Technical Regulation on Electric Blasting Machines." Code: QCVN 01:2015/BCT.

Article 2. Effective Date

This Circular takes effect from December 22, 2015.

Article 3. Responsibility for Implementation

1. Organizations and individuals related to this matter shall be responsible for implementing this Circular.

2. In case of difficulties or obstacles, organizations and individuals shall promptly reflect them to the Ministry of Industry and Trade for consideration and resolution./.

 

 

QCVN 01 : 2015/BCT

NATIONAL TECHNICAL REGULATION ON ELECTRIC BLASTING MACHINES

National Technical Regulation For Electrical Blasting Machine

 

Foreword

QCVN 01 : 2015/BCT was drafted by the Drafting Board of the National Technical Regulation on Electric Blasting Machines, reviewed by the Department of Science and Technology - Ministry of Industry and Trade, examined by the Ministry of Science and Technology, and issued together with Circular No. 14/2015/TT-BCT dated June 22, 2015.

 

NATIONAL TECHNICAL REGULATION ON ELECTRIC BLASTING MACHINES

National Technical Regulation for Electrical Blasting Machine

Chapter 1. GENERAL PROVISIONS

1.1. Scope of Application

1.1.1. This technical regulation specifies the limit values for technical indicators and testing methods for capacitor-type electric blasting machines.

1.1.2. Electric blasting machines that do not operate according to the capacitor principle are not within the scope of this regulation.

1.2. Applicability

This technical regulation applies to organizations and individuals involved in production, import, business, testing, inspection, and use of electric blasting machines in Vietnam's territory, except where international treaties to which Vietnam is a party provide otherwise.

1.3. Definitions

In this regulation, the following terms are understood as follows:

1.3.1. Capacitor-type electric blasting machine (abbreviated as electric blasting machine) is a specialized device designed to supply electrical energy for the purpose of igniting electric detonators or electric blasting circuits.

1.3.2. Electric blasting circuit is a set of electric detonators, connecting wires between detonators, and the power source (abbreviated as blasting circuit).

1.3.3. Rated load resistance is the maximum permissible circuit resistance of the detonator that allows the electric blasting machine to ensure the complete ignition of the entire blasting circuit.

1.3.4. Automatic pulse width limitation is the automatic limitation of the pulse width emitted by the electric blasting machine in the blasting circuit, changing hazardous spark parameters of the blasting system (electric blasting machine - electric blasting circuit) into safe sparks before the electric blasting circuit can be damaged by the activation of any detonator in the group.

1.3.5. Safe discharge time is the maximum allowable duration of the current pulse when blasting in an environment containing flammable gases and explosive dust; unit of measurement is (ms).

1.3.6. Non-failing element

A non-failing element is a component with manufacturing and assembly structures as well as technical parameters that remain unchanged under all normal operating conditions and faults, its power consumption does not exceed two-thirds of the permitted power of the element.

1.3.7. Technical safety inspection of electric blasting machines is a technical activity carried out through a testing process aimed at evaluating and confirming the compliance of the technical safety condition of electric blasting machines as specified in this regulation.

1.4. Referenced Documents

1.4.1. QCVN 02: 2008/BCT National Technical Regulation on Safety in Storage, Transportation, Use, and Disposal of Industrial Explosives.

1.4.2. QCVN 04: 2009/BCT National Technical Regulation on Safety in Open-Pit Mining.

1.4.3. QCVN 05: 2012/BLĐTBXH National Technical Regulation on Occupational Safety in Quarrying and Stone Processing.

1.4.4. QCVN 04 - 04: 2012/BNNPTNT National Technical Regulation on Hydraulic Engineering - Drilling and Blasting Rock Requirements.

1.4.5. QCVN 01: 2011/BCT National Technical Regulation on Safety in Underground Coal Mining.

1.4.6. TCVN 7079-0: 2002 Electrical Equipment for Underground Mines - Part 0: General Requirements.

1.4.7. TCVN 7079-1: 2002 Electrical Equipment for Underground Mines - Part 1: Non-Incendive Enclosures - Type "d" Protection.

1.4.8. TCVN 7079-11: 2002 Electrical Equipment for Underground Mines - Part 11: Spark Safety - Type "i" Protection.

1.4.9. TCVN 7079-18: 2003 Electrical Equipment for Underground Mines - Part 18: Filling with Covering Material - Type "m" Protection.

1.4.10. TCVN 4255: 2008 - Ingress Protection (IP) Rating.

2. TECHNICAL PROVISIONS

2.1. Electric blasting machines used in normal environments (without flammable gases and explosive dust).

2.1.1. Normal operating conditions:

2.1.1.1. Temperature: (0 °C ÷ +40 °C);

2.1.1.2. Relative humidity of surrounding air must not exceed 95%;

2.1.1.3. Atmospheric pressure: (80 kPa ÷ 110 kPa).

2.1.2. The ingress protection rating must not be lower than IP54 according to TCVN 4255: 2008 - Ingress Protection (IP) Rating.

2.1.3. The pulse voltage generated by the electric blasting machine must not exceed 3000 V.

2.1.4. The structure of the machine must ensure operation only with a dedicated key. The dedicated key may be mechanical or electronic.

2.1.5. The voltage on the capacitor after discharging the pulse to ignite must be reduced to zero within 10 seconds, components used to dissipate the capacitor's residual energy after discharge must be non-failing elements.

2.1.6. Connections to the blasting circuit wires must be equipped with dedicated connectors. Conductive parts of the connecting equipment (connectors) must be insulated to prevent short-circuiting due to foreign objects or wire ends touching.

2.1.7. There must be a display indicating the machine is ready to ignite after the capacitor is fully charged.

2.1.8. The structure of the electric blasting machine and its electrical circuit must ensure the ability to automatically cut off the current flowing in the blasting circuit.

2.1.9. The magnitude of the current pulse delivered to the blasting circuit must be greater than 1.3 A.

2.1.10. Electric blasting machines may be designed with additional measuring circuits to check the status of the blasting circuit. During measurement, the current through the blasting circuit must not exceed 50 mA.

2.1.11. The insulation resistance of the equipment must be greater than 3 MΩ.

2.1.12. The technical documentation of the electric blasting machine must include all technical parameters of the machine, including: Operating voltage, permissible resistance of the blasting circuit, charging time of the machine, amplitude, duration, energy of the discharge pulse, and other necessary information.

2.2. Electric blasting machines used in environments with flammable gases and explosive dust

2.2.1. Electric blasting machines must meet the requirements of Section 2.1.

2.2.2. Explosive electric blasting machines used in environments with flammable gases and explosive dust must comply with TCVN 7079-0: 2002 Electrical equipment for surface and underground mines - Part 0: General requirements, TCVN 7079-1: 2002 Non-sparking enclosures - Protection type "d"; or TCVN 7079-11: 2002 Spark-proofing - Protection type "i"; or TCVN 7079-18: 2003 Filling with non-conductive material - Protection type "m" or international standards IEC 60079, depending on the explosion protection type registered by the manufacturer.

2.2.3. The peak voltage generated by the explosive electric blasting machine shall not exceed 1500 V.

2.2.4. For explosive electric blasting machines designed with an additional measuring circuit to check the resistance of the explosive electrical network, this measuring circuit must have an explosion-proof protection type: spark-proofing and the current through the explosive electrical network shall not exceed 50 mA.

2.2.5. The charging time from start-up until the capacitor indicator part is fully charged shall not exceed 15 seconds.

2.2.6. The pulse width limiting device provided for the explosive network must meet the following requirements:

2.2.6.1. The power supply must be disconnected from the explosive network.

2.2.6.2. The pulse duration shall be within the range 3ms ≤ t ≤ 4ms.

2.2.7. Under rated load conditions, when the display part of the machine has started to activate, the magnitude of the current pulse delivered to the explosive network must ensure that it is not less than 1.3 A, and the energy of the pulse must meet the specifications given in the technical documentation.

3. MANAGEMENT PROVISIONS

3.1. Inspection regulations

3.1.1. Inspection requirements

3.1.1.1. Organizations and individuals producing, trading, and using explosive electric blasting machines must conduct quality inspections in accordance with this standard and implement labeling as prescribed in Section 3.4 of this standard.

3.1.1.2. The conformity assessment for explosive electric blasting machines is carried out according to method 7: Testing and evaluating batches of goods as stipulated in Section VII, Appendix 2, Circular No. 28/2012/TT-BKHCN dated December 12, 2012 of the Ministry of Science and Technology regarding the provisions on declaration of conformity and conformity assessment methods.

3.1.1.3. Regulations on designation of inspection organizations and testing organizations

The designation of inspection organizations and testing organizations for explosive electric blasting machines is carried out in accordance with the provisions in Section 2 Chapter II of Circular No. 48/2011/TT-BCT dated December 30, 2011 of the Ministry of Industry and Trade concerning the management of product quality in Group 2 products under the jurisdiction of the Ministry of Industry and Trade.

3.1.1.4. Explosive electric blasting machines must be affixed with an inspection label before being put into circulation on the market, in accordance with the prescribed regulations.

3.1.2. Inspection methods

3.1.2.1. The conformity assessment of the housing with the requirements of Section 2.1.2 according to TCVN 4255: 2008 - Enclosure protection level (IP code).

3.1.2.2. Depending on the protection type selected by the manufacturer, the conformity assessment of the equipment with the requirements of Section 2.2.2 is conducted according to TCVN 7079-1: 2002 Non-sparking enclosures - Protection type "d"; or TCVN 7079-11: 2002 Spark-proofing - Protection type "i"; or TCVN 7079-18: 2003 Filling with non-conductive material - Protection type "m" or international standards IEC 60079, the testing procedures must be carried out according to the corresponding test methods specified in these standards.

3.1.2.3. The conformity assessment of the equipment with the requirements of Sections 2.1.4; 2.1.6; 2.1.7 and 2.1.8 is performed by reviewing technical documentation and testing samples of the equipment.

3.1.2.4. The conformity assessment of the equipment with the requirements of Sections 2.1.3 and 2.2.3 is performed by measuring the voltage across the fully charged capacitor of the explosive electric blasting machine using precision resistors of 1% accuracy and measurement instruments of 0.5% accuracy, or using an oscilloscope to record data, with measurement errors not exceeding ±5% of the measured value.

3.1.2.5. The conformity assessment of the equipment with the requirements of Section 2.1.5 includes measuring the voltage across the capacitor after 10 seconds using a measurement instrument of 0.5% accuracy or by recording the pulse waveform (oscilloscope), with measurement errors not exceeding ±5%.

3.1.2.6. The conformity assessment of the equipment with the requirements of Sections 2.1.9 and 2.2.7 is performed by measuring the magnitude and duration of the current pulse using precision resistors with values equal to the maximum allowable resistance of the explosive network, combined with an oscilloscope.

3.1.2.7. The conformity assessment of the equipment with the requirements of Sections 2.1.10 and 2.1.11 is performed by direct testing on sample units using current measurement instruments of 0.5% accuracy and a megohmmeter of 1000V.

3.1.3. Inspection process

3.1.3.1. To ensure reliability and accuracy, the equipment must be re-inspected annually, and the testing procedures must comply with Section 3.1.2.

3.1.3.2. Organizations authorized to perform quality inspections of explosive electric blasting machines must publish their inspection procedures and measurement devices used for inspections.

3.2. Safety regulations during use

3.2.1. Before each use, a thorough technical inspection of the explosive electric blasting machine must be conducted, including the machine's housing, ignition lock, wiring structures, screws, etc., to ensure proper operation.

3.2.2. The key to the explosive electric blasting machine must be kept by the blasting supervisor or the person assigned responsibility for blasting from the preparation stage until the detonation. It is prohibited to hand over the blasting key to anyone else.

3.2.3. Blasting may only occur after the explosive network resistance has been checked and confirmed safe.

3.2.4. Prior to blasting in environments with flammable gases and explosive dust, the concentration of flammable gases in the environment must be checked to ensure it is within the permissible limits as stipulated by current technical standards (for coal mines, the methane concentration in mine air must be less than 1%).

3.2.5. Disassembly, replacement of parts of the machine in environments with flammable gases and explosive dust is strictly prohibited. Only battery replacement can be done in a safe area (without flammable gases and explosive dust).

3.2.6. After each use, the explosive electric blasting machine must be cleaned and maintained properly, then handed over to the responsible person for inspection and storage at the designated location.

3.3. Inspection regulations

Electric detonator firing machines imported, produced domestically, circulating in the market, and during their use must be subject to quality inspection in accordance with Circular No. 48/2011/TT-BCT dated December 30, 2011 of the Ministry of Industry and Trade and current laws on product and commodity quality.

3.4. Labeling

Electric detonator firing machines must comply with labeling requirements stipulated in Decree No. 89/2006/NĐ-CP dated August 30, 2006 of the Government regarding product labels and must display the following information:

3.4.1. Type of equipment.

3.4.2. Manufacturer's symbol or product symbol.

3.4.3. Operating voltage.

3.4.4. Permissible resistance of the blasting network.

3.4.5. Equipment serial number and year of manufacture.

3.4.6. Enclosure protection rating symbol.

3.4.7. Blasting protection type symbol (if used in environments with flammable gases and explosive dust).

4. IMPLEMENTATION ORGANIZATIONS

4.1. The Department of Science and Technology shall take the lead and coordinate with the General Directorate of Safety and Environmental Protection for Industry, relevant units to guide and inspect the implementation of this Technical Regulation.

4.2. The Market Management Administration shall be responsible for organizing and directing Provincial and Municipal Market Management Bureaus to inspect, control, and handle violations related to the quality of products and commodities circulating in the market according to the provisions of the law and this Technical Regulation.

4.3. Provincial and Municipal Departments of Industry and Trade shall be responsible for guiding and inspecting the implementation of this technical regulation at the local level, reporting to the Ministry of Industry and Trade on the implementation situation, difficulties, and issues periodically before January 31 of the following year or at any time.

4.4. In cases where regulatory legal documents, materials, and standards cited in this Technical Regulation are amended, supplemented, or replaced, they shall be implemented according to the new document./.