Shenzhen ZhongNuo Inspection & Technology Co., Ltd. is based in South China, offering services such as on-site explosion-proof construction, safety inspections, renovations, project acceptance, and explosion-proof installation. We are well-versed in explosion-proof construction standards, with experienced construction teams and a wealth of practical experience. We have served major corporations including PetroChina, LG, Huanlan Environment, BOE, and KeXing Biotechnology, earning consistent positive feedback and trust from our clients!
Based on the fundamental requirements of GB 15577 "Safety Regulations for Dust Explosion Prevention," the following five main explosion-proof measures can be adopted for explosion-proof construction and renovation in explosive dust environments (shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.).
Explosion-proof
1. Definition: A containment explosion suppression technology that allows the enclosed package to withstand the pressure of a large explosion when combustible dust and gaseous oxidizers or air are present inside, preventing the package from being destroyed.
2. Objective: By enhancing the wall thickness of the container and improving the material, external damage will be minimized even in the event of a dust explosion.
3. Basic Requirements:
When 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 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 for explosion-proof pressure and impact resistance should comply with the requirements of GB/T 24626.
Explosion Relief
1. Definition: A suppression technology that, upon explosion occurring within the containment, releases the high-temperature, high-pressure combustion products and unburned substances generated by the explosion through pre-set weak points on the containment before the explosion pressure reaches the containment's limit strength, thereby preventing the containment from being destroyed.
2. Purpose: To reduce explosion losses by installing explosion relief devices.
3. Methods: Flare and Non-Flare Explosion Relief are the two available relief methods.
4. Basic Requirements:
(1) If the strength of the process equipment is insufficient to withstand the overpressure generated by internal dust explosion under actual working conditions, a relief port should be installed. The relief port should be directed towards a safe direction, and its size 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 to the outside through a pressure relief conduit should be fitted with flameless venting caps.
(4) Process equipment with inline piping 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 flame and suppress (prevent) the development of dust explosion through physical and chemical actions.
2. Objective: To pre-detect and extinguish fires, as well as suppress explosions, by installing explosion suppression devices.
3. Basic Requirements:
Process equipment with a risk of dust explosion should be protected with explosion suppression devices.
(2) If a monitoring-type 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 that prevents the spread of an explosion by means of physical and chemical actions after the explosion occurs.
2. Purpose: To prevent the spread of flame through pipelines or other conduits
3. Basic Requirements:
(3) Equipment and facilities with dust explosion hazards that are interconnected by pipelines should be equipped with explosion-proof devices on the pipelines.
(2) Equipment and facilities with dust explosion hazards that are interconnected through pipelines should be equipped with explosion suppression devices. The shutdown direction should align 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.

In recent years, as society continues to develop and safety accidents become increasingly prominent, people's awareness of safety production has been on the rise, making it urgent to address potential hazards in dangerous environments.
In various industrial sectors in our country, such as oil, chemicals, ports, coal, and others, during the 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 mix with air, they can form explosive mixtures. If the concentration of the mixture reaches the explosive range, a spark can trigger an explosion and severe fires, potentially leading to catastrophic chain reactions. Therefore, equipment used in such hazardous environments must be certified with explosion-proof capabilities. The use of all explosion-proof environment equipment requires installation and commissioning by experienced engineering companies, strictly adhering to the specifications and acceptance standards for explosion-proof construction. Only then can the safety requirements of each stage in the production process be maximally ensured.

Basic Safety Standards for Explosion-Proof Design in Hazardous Areas (Shared by Shenzhen ZhongNuo Testing Technology Co., Ltd.)
1. Initial Explosion Protection Overall Design
2. Directed release of explosive energy. Around the explosion source, comprehensively utilize anti-explosion and venting technology, setting anti-explosion walls and windows in the direction of high population density, office areas, and critical equipment; and venting walls and windows in directions with low human traffic and no critical equipment.
3. Determine the safe distance. Avoid setting up personnel office areas, residential zones, and critical equipment areas within the distance if not necessary; if they are established, necessary anti-explosion measures should be taken.
4. Conversion of non-blast-resistant buildings to blast-resistant structures. Within the range of less than the safe distance, blast resistance assessment of the buildings should be conducted, and reinforcement for buildings not meeting blast resistance requirements should be carried out: to prevent building collapse; to prevent the fracturing of brittle materials such as bricks, concrete, glass, etc., and the resulting shrapnel.
5. Place explosion-proof shelters in hazardous blast areas.

Shenzhen ZhongNuo Testing Technology Co., Ltd. offers explosion-proof construction service in the field of:
Explosive gas environments and hazardous areas with explosive or combustible dust exist in various industries and fields, including petrochemicals, metal smelting, fine chemicals, petrochemical ground facilities (gas stations, refueling 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 explosion-proof safety in these dangerous areas safeguards the防爆 safety of hazardous explosion-prone places for both our and the national economy's development.
Explosion-proof electrical modifications and on-site explosion-proof construction consulting services for hazardous areas — Shenzhen Zhongnuo Testing Technology Co., Ltd.