Zhongshan Explosion-proof Retrofitting

Shenzhen Zhongnuo Inspection & Technology Co., Ltd. is based in South China and offers explosion-proof technology consulting services, including on-site construction, safety inspections, modifications, project acceptance, and installation. We are well-versed in explosion-proof construction standards, boast a team with extensive construction experience, and have served major corporations such as PetroChina, LG, Hanlan Environment, BOE Technology Group, and Sinovac Biotech, receiving consistent praise and trust from our clients!
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 are present in various industries and fields, including petrochemicals, metal smelting, fine chemicals, petrochemical ground facilities (such as gas stations, refueling stations, and petrochemical storage and transportation), new energy, special equipment, nuclear power, tunnels, grain processing, wood processing, metal component manufacturing, and environmental protection engineering. Ensuring explosion-proof safety in these dangerous areas safeguards the防爆safety of hazardous explosion-prone spaces, protecting the economic development of our country and its people.

Shenzhen Zhongnuo Testing Technology Co., Ltd. offers explosion-proof engineering construction services for hazardous explosive areas.
1. Explosion-proof field inspection and consultation
2. Explosion-proof engineering construction and renovation on-site
3. Explosion-proof construction acceptance
4. Explosion-proof electrical installation, maintenance, and renovation
5. Explosion relief walls, doors, and windows installation
6. Dust Removal Equipment Installation and Retrofitting Construction

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 tilt, and fixed installation.
2. When using non-explosion-proof equipment for mechanical transmission as a partition wall, the following regulations should be observed:
The room for installing 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 gland packing 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 environment, a positive pressure relative to the explosive environment should be maintained.
3. Electrical lines and equipment in explosive environments, excluding inherently safe circuits, must be equipped with overcurrent, short-circuit, and ground protection. Overcurrent protection is not required for electrical equipment that cannot experience overloading. Motors in explosive environments should be fitted with phase failure protection in addition to the necessary protection as required by current standards. If the automatic shutdown of electrical equipment may pose a greater danger than the ignition hazard, an alarm device should be used instead of an automatic shutdown device.
4. In emergency situations, measures should be taken at suitable locations or sites outside of hazardous areas to disconnect the power to equipment within the hazardous area. Continuous-running 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, sub-stations (including switch 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 within areas 1 and 2.
(2) For explosive gas atmospheres where the gas is denser than air, the equipment floor of electrical and instrumentation in power 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.

According to the basic requirements of GB 15577 "Safety Code for Dust Explosion Prevention," in防爆construction and modification in explosive dust environments, the following five major explosion prevention measures can primarily be adopted (shared by Shenzhen ZhongNuo Inspection Technology Co., Ltd.).
Anti-knock
1. Definition: A suppression technology that allows the enclosed container to withstand the high explosion pressure when an explosion occurs within, where flammable dust and gaseous oxidizers or air are present, thereby preventing the container from being destroyed.
2. Objective: By enhancing container wall thickness and improving materials, external damage can be minimized even in the event of a dust explosion.
3. Basic Requirements:
When manufacturing and handling powders that can cause explosions, if there are no explosion suppression devices and no pressure relief measures, all process equipment should be designed with explosion-proof features and capable of withstanding overpressure generated by internal explosions without bursting.
(2) The connection 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 an explosion occurring within an enclosed package, allows the high temperature, high-pressure combustion products, and unburned materials generated by the explosion to escape through pre-set weak points in the package towards a safe direction before the explosion pressure reaches the package's limiting strength, thus preventing the package from being destroyed.
2. Purpose: To reduce explosion losses by installing explosion relief devices.
3. Methods: Two explosion relief methods are 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 actual working 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) Dust explosion hazard equipment installed indoors should vent to a safe outdoor direction through pressure relief conduits. These conduits should be as short and straight as possible, with a cross-sectional area not less than that of the relief port, and their strength should not be less than the strength of the protected equipment container.
(3) Equipment inside the room that cannot vent explosions to the outside via a pressure relief conduit should be equipped with flameless explosion relief 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: During the initial stage of an explosion, extinguishing the flame and suppressing (preventing) the progression of dust explosion through physical and chemical actions.
2. Purpose: To pre-detect fire extinguishing and explosion suppression through the installation of an explosion suppression device.
3. Basic Requirements:
Process equipment with a risk of dust explosion should be protected by using explosion suppression devices.
(2) If a monitoring-type explosion suppression device is used, it should comply with the requirements of GB/T 18154.
(3) Design and application of explosion suppression systems should comply with the requirements of GB/T 25445.
Four, Explosion-proof
1. Definition: Technology that prevents the spread of an explosion through physical and chemical actions after an explosion occurs.
2. Purpose: To prevent flame spread through pipes or other conduits
3. Basic Requirements:
(3) Equipment and facilities with dust explosion hazards, interconnected through 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 suppression 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.
Explosion-proof electrical modifications and on-site explosion-proof construction consulting services for hazardous areas — Shenzhen Zhongnuo Testing Technology Co., Ltd.