What qualifications are required for explosion-proof electrical construction in Nanjing? Shenzhen ZhongNuo Inspection

Shenzhen ZhongNuo Inspection & Technology Co., Ltd. is based in South China and offers a range of explosion-proof technical consulting services, including on-site explosion-proof construction, safety inspections, modifications, project acceptance, and installation. We are well-versed in explosion-proof construction standards and boast experienced construction teams with a wealth of experience. We've served major corporations like PetroChina, LG, Huanlan Environment, BOE Technology Group, and Sinovac Biotech, receiving consistent praise and trust from our clients!
In recent years, with the continuous development of society and the increasing prominence of safety accidents, people's awareness of safety production has been on the rise, and the governance of potential hazards in dangerous environments is urgently needed.
In various industrial sectors in our country, such as oil, petrochemicals, ports, coal, and others, during production, processing, transportation, and storage processes, there is often a risk of leaks or spills of flammable and explosive gases, liquids, dust, and fibers. When these substances are mixed with air, they can form explosive mixtures. If the concentration of the mixture reaches the explosive range, any ignition source can cause explosions and severe fires, potentially leading to catastrophic chain reactions. Therefore, equipment used in such hazardous environments must be certified explosion-proof products with safety features. The use of all equipment in explosion-proof environments must be installed and debugged by experienced engineering companies in strict accordance with explosion-proof construction specifications and acceptance standards before being put into actual production use. This ensures the maximum safety requirements for all stages of the production process.

Basic Standards for Explosion-Proof Electrical Construction (Shared by Shenzhen ZhongNuo Inspection Technology Co., Ltd.)
Explosion-proof electrical installation differs from standard electrical installation due to the increased explosion-proof requirements of its environment. In accordance with industry standards, an environment where air mixes with gases, vapors, mist, or dust under atmospheric conditions and, upon ignition, the combustion spreads to the entire unburned mixture is termed an explosive environment. An area where explosive gas environments or flammable dust environments are present or expected in sufficient quantities to necessitate special preventive measures for the structure, installation, and use of electrical equipment is called a hazardous area. Explosion-proof electrical installation refers to the work of conducting operations in explosive environments or hazardous areas, meeting the requirements for explosion-proof electrical equipment, conditions, and personnel, with strong emphasis on safety.

According to the basic requirements of GB 15577 "Safety Code for Dust Explosion Prevention," for explosion-proof construction and modification in explosive dust environments, the following five main explosion-proof measures can be adopted (shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.).
Anti-knock
1. Definition: A suppression technology that allows the enclosed container to withstand the pressure of a large explosion when flammable dust and gaseous oxidizers or air are present inside, preventing the container from being destroyed.
2. Objective: By enhancing the container wall thickness and improving the material, external damage is minimized even in the event of a dust explosion.
3. Basic Requirements:
When producing and handling powdered materials that can cause explosions, if there is no explosion suppression device or pressure relief measures, all process equipment should be equipped with explosion-proof designs and able to withstand the overpressure from internal explosions without bursting.
(2) The connecting parts between various process equipment (such as pipes, flanges, etc.) should have the same strength as the equipment itself. For connections between high-strength and low-strength equipment, explosion-proof devices should be installed.
(3) Equipment with explosion-proof pressure and explosion-proof pressure impact resistance should comply with the requirements of GB/T 24626.
Explosion Relief
1. Definition: A controlled explosion technique that, upon an explosion occurring within the containment vessel, allows the high temperature, high-pressure combustion products, and unburned materials generated by the explosion to be released through pre-set weak points in the containment vessel to a safe direction before the explosion pressure reaches the vessel's limiting strength, thus preventing the vessel from being damaged.
2. Purpose: To reduce explosion losses by installing explosion relief devices.
3. Methods: Two explosion relief methods available – Flaming and Non-flaming.
4. Basic Requirements:
When the strength of the process equipment is insufficient to withstand the overpressure generated by internal dust explosion under its actual operating conditions, explosion relief ports should be installed. The relief ports should be directed towards a safe direction, and the size of the relief ports should comply with the requirements of GB/T 15605.
(2) Indoor dust explosion hazard process equipment should be vented to a safe outdoor direction through pressure relief ducts. The pressure relief ducts should be as short and straight as possible, with a cross-sectional area not less than that of the relief opening, and their strength should not be less than the strength of the protected equipment container.
(3) Equipment within the room that cannot vent explosion to the outside via a pressure relief conduit should be equipped with flameless explosion venting caps.
(4) Process equipment with inline pipelines should be designed to withstand at least 0.1 MPa of internal overpressure.
Section 3: Explosion Suppression
1. Definition: In the initial stage of an explosion, extinguish the flames and suppress (prevent) the development of dust explosion through physical and chemical actions.
2. Objective: To pre-detect fire extinguishing and explosion suppression through the installation of explosion suppression devices.
3. Basic Requirements:
Process equipment with a risk of dust explosion should be protected by using explosion suppression devices.
(2) If a monitored explosion suppression device is used, it should comply with the requirements of GB/T 18154.
(3) Explosion suppression system design and application shall comply with the requirements of GB/T 25445.
Four, Explosion-proof
1. Definition: Technology used to prevent the spread of an explosion through physical and chemical actions after the explosion occurs.
2. Purpose: To prevent the spread of flame through pipes or other conduits
3. Basic Requirements:
(3) Equipment and facilities with a risk of dust explosion should be interconnected by pipes, and explosion-proof devices should be installed on the pipes.
(2) Equipment and facilities with dust explosion hazards that are interconnected through pipelines should be equipped with explosion-proof devices on the pipelines. The shutdown direction should be consistent with the direction of explosion propagation.
Five, Inertization
For processes such as crushing, grinding, drying of powders, and pneumatic conveying through pipelines in sealed containers, inert gases like nitrogen, carbon dioxide, halogenated hydrocarbons, argon, helium, and steam, or inert dusts such as fire extinguishing powder, chemical dry powder, and mineral rock powder are introduced. This is to dilute combustible components and reduce the oxygen content in the environment.

Shenzhen Zhongnuo Testing Technology Co., Ltd. offers explosion-proof construction service in the field of:
Explosive gas environments and hazardous areas with explosive or flammable dust exist in various industries and fields, including petrochemicals, metal smelting, fine chemicals, petrochemical ground facilities (gas stations, gas filling stations, petrochemical warehousing and transportation), new energy, special equipment, nuclear power, tunnels, grain processing, wood processing, metal component manufacturing, environmental protection engineering, and more. Ensuring the explosion-proof safety of these dangerous areas safeguards our and the national economy's development.
explosion-proof electrical retrofitting and on-site explosion-proof construction consulting services for hazardous areas - Shenzhen Zhongnuo Testing Technology Co., Ltd.