Interpretation of Safety Standards for Bolt Preloading in the Petrochemical Industry

The petrochemical industry faces complex bolt tightening environments with multiple hazards, including flammability, explosivity, high temperature and pressure, and toxic substances. To ensure operational safety, national authorities have established a series of safety standards. This article provides an in-depth interpretation of these requirements to help professionals improve safety performance and compliance.

I. Explosion-Proof Requirements

Petrochemical plant areas are classified as explosion-hazard zones. Only explosion-proof certified tools and equipment must be used:

• Tool explosion-proof rating: Ex d IIB T4 or higher
• Pneumatic Tools: Preferred Choice, No Spark Risk
• Power tools: Must have explosion-proof certification
• Hydraulic Tools: Place the hydraulic power unit in a safe area.

II. Work Permit System

The petrochemical industry strictly enforces the work permit system. Prior to bolt tightening operations, all relevant procedures must be completed:

• Hot Work Permit: Covers open-flame operations such as welding and cutting.
• Confined Space Entry Permit: Entering containers, pipelines, and other confined spaces
• Permit for Work at Heights: 2 meters or higher
• Temporary Power Permit: Use Temporary Power

3. Personal Protective Equipment Requirements

Personnel must wear required personal protective equipment (PPE):

• Hard Hat: Complies with GB2811 standard
• Safety Glasses: Protects eyes from foreign objects
• Protective Gloves: Oil-Resistant, Non-Slip, Cut-Resistant
• Safety Shoes: Toe Protection, Puncture Resistance, Anti-Static
• Protective Suit: Anti-static, Flame-retardant

IV. Gas Detection Requirements

Gas testing must be conducted before and during work:

• Combustible gas concentration: Below 10% of the Lower Explosive Limit (LEL)
• Toxic gas concentration: Below occupational exposure limits
• Oxygen content: 19.5%–23.5%
• Inspection frequency: Pre-work inspection, followed by re-inspection every 2 hours during work.

V. Emergency Response Requirements

The work site must be equipped with necessary emergency equipment and supplies:

• Fire Extinguisher: Dry Chemical or Carbon Dioxide
• Eyewash Station: Emergency rinse for chemical exposure
• First Aid Kit: Equipped with common medicines and supplies
• Emergency Communication: Maintain connectivity to contact rescue teams promptly.

Safety guidelines for bolt preloading in the petrochemical industry are critical for protecting personnel and equipment. All staff must strictly adhere to these standards, enhance safety awareness, and ensure compliant operations. Ailansheng Technology provides explosion-proof hydraulic torque tools and professional safety training services to help clients improve the safety and compliance of bolt preloading in the petrochemical sector.