Shenzhen ZhongNuo Inspection Technology Co., Ltd. is based in South China, offering explosion-proof construction on-site services, safety inspections, renovations, project acceptance, and explosion-proof installation. We are well-versed in explosion-proof construction standards, with experienced teams and extensive practical experience. We have served major corporations such as PetroChina, LG, Huanlan Environment, BOE Technology Group, and Sinovac Biotech, earning consistent praise and trust from our clients!
Basic Requirements for Explosion-Proof Electrical Installations in Explosive Areas (Shared by Shenzhen ZhongNuo Inspection Technology Co., Ltd.)
1. Oil-immersed equipment should be used under conditions of no vibration, no inclination, and fixed installation.
2. When using non-explosion-proof equipment for mechanical transmission as partition walls, the following regulations should be observed:
The room housing electrical equipment should be separated from the explosive hazard area by a solid wall made of non-combustible materials.
(2) Transmission shafts passing through walls should be sealed with stuffing boxes or equivalent sealing measures.
(3) The exit of the electrical equipment room should lead to an environment free of explosive hazard areas.
(4) When the room where the equipment is installed must be connected to an explosive atmosphere, a positive pressure relative to the explosive atmosphere should be maintained.
3. Electrical wiring and equipment in explosive environments, excluding inherently safe circuits, should be equipped with overload, short-circuit, and grounding protection. Electrical equipment that cannot experience overload does not require overload protection. Motors in explosive environments, in addition to the necessary protection as required by current standards, should also be equipped with phase failure protection. If the automatic shutdown of electrical equipment could pose a greater risk than the ignition hazard, an alarm device should be used in place of the automatic shutdown device.
4. In emergency situations, appropriate measures should be taken at suitable locations outside of hazardous areas to disconnect the power supply to the equipment in the hazardous area. Continuous operating equipment should not be included in the emergency shutdown circuit and should be installed on a separate circuit to prevent the occurrence of additional hazards.
5. The design of substation, distribution substation, and control room shall comply with the following regulations:
Transformer stations, distribution stations (including distribution rooms, etc.), and control rooms should be located outside of explosive atmosphere environments. When they are in a positive pressure room, they can be arranged in Zones 1 and 2.
(2) For explosive gas atmospheres where the gas is heavier than air, the equipment floor of electrical and instrumentation in substations, distribution stations, and control rooms located in the additional 2 zone of the explosion hazard area should be elevated 0.6 meters above the external ground level.

Basic Safety Rules for Explosion-Proof Electrical Construction (shared by Shenzhen Zhongnuo Testing Technology Co., Ltd.)
Explosion-proof electrical installation differs from standard electrical installation due to the increased explosion-proof requirements of its environment. Based on industry standards, an environment where air mixes with gases, vapors, mist, or dust, and upon ignition, the flame can spread to the entire unburned mixture, is termed an explosive environment. An area where a large number or expected number of explosive gas environments or flammable dust environments necessitates special preventive measures for the structure, installation, and use of electrical equipment is called a hazardous area. Explosion-proof electrical installation refers to a task that meets the requirements for explosion-proof electrical equipment, conditions, and personnel, and involves working in explosive environments and hazardous areas, emphasizing strength.

Based on the basic requirements of GB 15577 "Safety Code for Dust Explosion Prevention," in the construction and renovation for explosion-proof in dust explosion-prone areas, the following five main explosion-proof measures can be adopted (shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.).
Anti-knock
1. Definition: An explosion suppression technology that allows a sealed container to withstand the immense pressure of an explosion when combustible dust and gaseous oxidizers or air are present inside.
2. Objective: By enhancing container wall thickness and improving material, external damage is minimized even in the event of a dust explosion.
3. Basic Requirements:
When producing and handling powders that can cause explosions, if there is no explosion suppression device and no pressure relief measures, all process equipment should be designed to be explosion-proof and capable of withstanding the overpressure generated by internal explosions without bursting.
(2) The connection parts between various process equipment (such as pipelines, 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 for explosion-proof pressure and impact resistance shall comply with the requirements of GB/T 24626.
Explosion Relief
1. Definition: An explosion suppression technology that, upon an explosion occurring within the confinement, releases the high-temperature, high-pressure combustion products and unburned materials through pre-established weak points in the confinement before the explosion pressure reaches the confinement's limiting strength, thereby preventing the destruction of the confinement.
2. Purpose: To reduce explosion damage by installing explosion relief devices.
3. Methods: Two explosion relief methods are available: flamed and flameless.
4. Basic Requirements:
When the strength of the process equipment is insufficient to withstand the overpressure generated by internal dust explosion under actual working conditions, explosion relief ports should be installed. These ports should be directed towards a safe direction, and their size should comply with the requirements of GB/T 15605.
(2) Dust explosion hazard process equipment installed indoors should be vented to a safe outdoor direction through pressure relief conduits. The conduits 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 be equal to or greater than the strength of the protected equipment container.
(3) For equipment within the room that cannot vent its explosion to the outdoors via a pressure relief conduit, a flameless venting hood should be installed.
(4) Process equipment with inline pipes should be designed to withstand at least 0.1 MPa of internal overpressure.
3. Explosion Suppression
1. Definition: During the initial stage of an explosion, extinguishing the flame and suppressing (preventing) the development of dust explosion through physical and chemical actions.
2. Purpose: To pre-detect and extinguish fires, as well as suppress explosions through the installation of explosion suppression devices.
3. Basic Requirements:
Process equipment with a risk of dust explosion should be protected with 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 propagation of an explosion following an explosion event through physical and chemical means.
2. Purpose: To prevent the spread of flames through pipes or other conduits
3. Basic Requirements:
(3) Equipment and facilities with dust explosion hazards that are interconnected by pipelines should ideally be equipped with explosion suppression devices on the pipelines.
(2) Equipment and facilities with dust explosion hazards that are interconnected by pipelines should be equipped with explosion-proof devices on the pipelines. The shutdown direction should be consistent with the direction of explosion propagation.
Five, Inertizing
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 engineering service in the field of:
Including petrochemicals, metal smelting, fine chemicals, petrochemical ground facilities (gas stations, gas filling stations, petrochemical warehousing and transportation, etc.), new energy, special equipment, nuclear power, tunnels, grain processing, wood processing, metal component processing, environmental protection engineering, and many other industries and fields, there are hazardous areas with explosive gas environments and explosive or flammable dust environments. Ensuring the explosion-proof safety of these dangerous areas safeguards the development of our and the national economy.
explosion-proof electrical modifications and on-site explosion-proof construction consulting services for hazardous areas — Shenzhen ZhongNuo Inspection Technology Co., Ltd.