When using specialized equipment for explosive environments (such as explosion-proof electric hoists), it is necessary to strictly follow the operating procedures to ensure safety. The following are key precautions, with detailed explanations as follows:

1、 Installation and commissioning phase

Confirmation of environmental compatibility

Verify whether the explosion-proof level of the equipment (such as Ex d Ⅱ BT4) matches the gas/dust group and temperature level of the work area.

Example: If propane (Class IIA) is present in the work area, equipment with an explosion-proof rating not lower than Class IIA must be selected.

Professional installation requirements

It must be operated by personnel with explosion-proof equipment installation qualifications to ensure that cable sealing joints, grounding devices, etc. comply with standards.

Case: An explosion was caused by static electricity in a chemical plant due to the improper installation of grounding devices.

Load limit

Overloading is strictly prohibited and must be operated within the range indicated on the nameplate.

Data: Overloading by 20% may shorten the fatigue life of steel wire ropes by more than 50%.

2、 Daily operation standards

Operator Qualification

Operators need to receive specialized training on explosion-proof equipment and be familiar with emergency response procedures.

Requirement: Conduct at least one explosion-proof equipment operation refresher training per year.

environmental monitoring

Check the gas concentration before homework to ensure it is below 25% of the lower explosive limit (LEL).

Tool: Equipped with a portable combustible gas detector to monitor the environment in real-time.

EXCEPTION

When abnormal noise, leakage, or temperature (exceeding 80 ℃) is detected, immediately stop the machine and report it.

Process: Establish a four step emergency mechanism of "discovery shutdown isolation maintenance".

3、 Key points for maintenance and overhaul

Regular inspection system

Monthly inspection of the integrity of the explosion-proof surface coating and quarterly electrical insulation testing (≥ 1M Ω).

Standard: The corrosion depth of the explosion-proof surface shall not exceed 0.3mm.

Maintenance qualification requirements

Repairs must be carried out by the original factory or authorized institutions, and unauthorized disassembly of explosion-proof components is prohibited.

Case: A coal mine illegally replaced a non explosion proof motor, resulting in a gas explosion.

Spare parts Management

Spare parts must have the same explosion-proof rating as the original equipment and be stored in an environment with a humidity of ≤ 75%.

Record: Establish a spare parts requisition ledger and trace the usage cycle.

4、 Environmental adaptability management

temperature control

The surface temperature of the equipment should be lower than the gas self ignition point in the work area (such as the methane self ignition point of 537 ℃).

Measures: Increase ventilation equipment during high temperature seasons to reduce environmental temperature.

Dust protection

When used in a dusty environment, it is necessary to install a dust cover and regularly clean the accumulated dust.

Standard: The thickness of the dust layer shall not exceed 5mm.

Protection against corrosive media

When used in acidic or alkaline environments, choose 316L stainless steel material or add anti-corrosion coating.

Testing: Conduct coating thickness testing (≥ 100 μ m) every six months.

5、 Compliance with regulations and standards

review of compliance

The equipment needs to obtain ATEX, IECEx or China Explosion proof Certificate (CNEX).

Verification: Check the authenticity of the certificate through the official website of the National Explosion proof Electrical Product Quality Supervision and Inspection Center.

record keeping

Save records of the entire lifecycle of the device, including installation, maintenance, and testing data.

Deadline: Explosion proof equipment archives must be kept for 5 years after the equipment is scrapped.

Emergency plan

Develop a special emergency plan for explosion-proof equipment and conduct a drill every six months.

Content: including emergency shutdown procedures, personnel evacuation routes, and firefighting equipment configuration.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment