GB/T 34587-2017 in English

This standard systematically specifies the technical requirements for inspection and repair of the refrigeration unit and container structure of steel refrigerated containers, and is applicable to mechanical refrigerated containers defined in GB/T7392. The standard technical framework includes:

• Refrigeration system maintenance: covering core components such as compressors, condensers, and evaporators
• Electrical system maintenance: including electronic equipment such as controllers and temperature recorders
• Box structure repair: for load-bearing components such as beams, columns, and panels
• Insulation layer reconstruction: special requirements for polyurethane foaming process

Case 1: Corner column patching repair

According to the requirements of 6.3.13.4:

1. The minimum size of the patch block is 150mm, and the distance from the corner piece weld is ≥300mm
2. The same grade of high-strength steel as the original material is used (yield strength ≥340MPa)
3. A 30° groove is required for welding, and full-section replacement is prohibited

Case 2: T-type bottom plate repair

According to 6.3.17:

• The web insertion depth of the I-shaped patch block is ≥13mm
• The top wing plate welding requires a 90° groove and is polished smooth
• A 50mm aluminum liner is required for partial replacement

Key points of quality management

1. Process control: The temperature of the heat affected zone (≤600℃) must be monitored during welding operations

2. Material traceability: Material certification documents must be retained when replacing components

3. Environmental protection requirements: The recovery and treatment of CFCs refrigerants must comply with Clause 4.4

Technology development prospects

With the application of IOT technology, it is recommended that subsequent versions add:

• Integration requirements for intelligent diagnostic systems
• Adaptation specifications for new environmentally friendly foaming materials
• Composite material repair process standards