General knowledge of demolition of chemical plant


November 5, Foshan City, Guangdong Province, a chemical company explosion in the removal of old equipment, killing one person dead and three people were slightly injured.

Related Case 1

November 18, 2013

A chemical company in Nantong, Jiangsu suffered an explosion of a tank during the demolition process and caused three injuries.

November 19, 2011

The maintenance personnel of Shandong Xintai United Chemical Co., Ltd. had a deflagration during the demolition of the blinds, resulting in 15 deaths and 4 injuries.

January 7, 2008

Shanxi Jinan Electronics and Trade Co., Ltd. exploded during the demolition of waste chemical storage tanks, killing 4 people and injuring 4 people.

Easy accident

The dismantling of chemical plants has many unfavorable factors such as the difficulty of demolition and many dangerous factors. Once negligence occurs, the following accidents can easily occur.

Fire and explosion

The cleaning and replacement of chemical devices is not complete, and flammable and explosive substances remain in the device or the (easily) combustible materials at the site of the device have not been cleaned. Fire and explosion accidents may occur when the fire is dismantled.


The poisonous and harmful substances on the installation site or inside the device have not been cleaned or replaced. Personal protective equipment has not been effectively worn. During the demolition process, poisonous and harmful substances are splashed (overflowed), which is likely to cause poisoning.


The scalding may come from two aspects: one is the residual acid, alkali and other corrosive chemicals in the device; the second is that in the process of cleaning the device, most of the devices must be cleaned with steam, and when the steam is used, the operation is improper or the protection is not In place, it may be burned with steam.

Falling high

When removing large equipment or working on platforms, holes, or pipe supports, protective measures are not in place, and high-falling accidents may occur.

Environmental pollution

After the device is parked, the remaining or discarded hazardous chemicals are improperly disposed, and environmental pollution such as running out may occur.

In addition to the above risk factors, there may be risk factors such as collapse, object strike, and lifting injury during the demolition process.

What should I pay attention to when working?

On-site workers must wear helmets, consciously wear personal protective equipment, strictly abide by relevant regulations and standards, follow the command of the site, and strictly prohibit blind and illegal operations.

Special operators must be certified after the training assessment, and illegal operation without a license is strictly prohibited.

Do not vent flammable or explosive gases into the atmosphere or equipment containers such as reaction vessels.

Blind board dismantling management must appoint someone to be responsible for the unified management. The blanking process must be performed according to the blind flow chart in the removal plan. Demolition blinds should be numbered and registered to prevent leakage. Blind plate thickness must meet the requirements of the process pressure level.

When moving the fire on equipment containers and pipelines containing flammable media, the source of the material should be cut off first, and the blinding plate must be added. After the scavenging, cleaning, and replacement, the ventilation holes of the manholes are opened and the samples can be analyzed and passed. Hot fire. The hot work at a high altitude shall adopt measures to prevent spark splashing, deal with the water seals of the trenches, valve wells, and downhole wells, and take measures to block or close low-level equipment, pipelines, valves, and meters.

During the dismantling of the device, safety officers at all levels and special (part-time) safety management personnel must perform safety inspection and supervision at the installation site. The on-site inspection and confirmation of each operation link shall be carried out in a safe and controlled state.

In order to clean and close down the wells, floor drains, and open drains at the site of the dismantling device, it is necessary to carry out the “triple set” (definite, regular, fixed-point) inspections. The well covers must be tightly closed and the pump ditch should establish and maintain an effective water seal.

When construction work is carried out on containers, equipment, and pipelines containing flammable and explosive materials, explosion-proof tools must be used. Strikes and collisions with iron tools are strictly forbidden.

When opening the equipment manhole, the internal temperature and pressure should be reduced to below the safety condition, and when opening the manhole, the bottom discharge slagging valve should be opened first, and it is confirmed that there is no remaining material inside before the operation can be performed. Before the manhole cover is loosened, it is forbidden to disassemble all the screws. Before dismantling the equipment, it must be inspected by relevant personnel to confirm that the stored ethanol, toluene, crude oil, steam, and water are completely disposed of before they are allowed to be disassembled to prevent residual pressure from hurting people.

The opening of the device after the dismantling of the device shall prevent foreign matter from falling into the pipe, and it shall have tight and secure sealing measures.

The motor vehicles and construction machinery that enter the on-site construction work must go through the relevant procedures (special permit) according to the regulations. Vehicle safety fire prevention facilities, in line with national standards, speed limit according to the specified route, parked at the designated location.

Parabolic objects, tools, and sundries are prohibited, and tools, materials, industrial waste, and other items should be placed at designated locations.

In case of abnormal conditions, such as material leakage, facility damage, etc., all construction operations shall be stopped and corresponding emergency measures shall be taken.

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.

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