The selection of sandblasting equipment for offshore oil production platforms demands a comprehensive consideration of environmental peculiarities, safety, efficiency, and durability. The following are the key aspects:

一. Equipment Selection Requirements

1. Explosion - proof Design

It is imperative that the equipment adheres to international explosion - proof standards such as ATEX or IECEx. Electrical components, including motors and control systems, must possess explosion - proof certifications (e.g., Ex d, Ex e). This is crucial to prevent the ignition of combustible gases, thereby avoiding potentially catastrophic explosions.

2. Corrosion - resistant Materials

The main body of the equipment is preferably constructed from 316L stainless steel or hot - dip galvanized steel. For the sandblasting hoses, they should exhibit both wear resistance and salt - fog resistance. For example, hoses with a polyurethane lining and steel wire reinforcement are suitable choices.

3. Environmental Adaptability

The equipment should be able to withstand the harsh marine environment characterized by high humidity, salt spray, and significant temperature variations. It is required to have a protection level of at least IP65. Additionally, it should be designed to endure wind and wave forces, ensuring stable operation even when the platform experiences oscillations.

4. Automation and Remote Control

Automated sandblasting systems, such as robotic sandblasting arms, are highly recommended. These systems can reduce manual intervention and enhance operational efficiency. Moreover, they should be integrated with sensors to monitor parameters such as pressure and abrasive flow rate in real - time.

二.Core Equipment Selection - Types of Sandblasting Machines

1. Pressure - fed Sandblasting Machines

Operating at high pressures ranging from 0.7 - 1.4 MPa, pressure - fed sandblasting machines are highly efficient and are particularly suitable for large - scale operations. However, they necessitate the use of a large - capacity air compressor for proper functioning.

2. Vacuum Recovery Sandblasting Machines

Featuring a closed - loop system, vacuum recovery sandblasting machines are effective in minimizing abrasive waste and environmental contamination. This makes them an ideal choice for operations in restricted spaces on the platform.

三. Abrasive Selection

1. Metal Abrasives

Metal abrasives, such as steel grit (G25 - G40) and steel shot, are recyclable and are well - suited for applications that require high - intensity surface treatment.

2. Non - metallic Abrasives

Non - metallic abrasives, including garnet and aluminum oxide, pose no risk of spark generation. Nevertheless, the complexity of abrasive recovery needs to be taken into account when using these materials.

四.Supporting Equipment

1. Air Compressors

Oil - free screw air compressors are recommended, with a minimum air supply capacity of 6 m³/min. The actual capacity may vary depending on the number of spray guns in use.

2. Dust Removal Systems

Explosion - proof dust collectors, such as those with a bag - type configuration and HEPA filtration, are essential. These systems should comply with OSHA dust standards to ensure a safe and clean working environment.

五. Safety and Environmental Protection

1. Safety Measures

To prevent static electricity - related hazards, the equipment should be properly grounded. Gas detectors (for LEL monitoring) should be installed in the sandblasting area. Additionally, all operating personnel are required to wear air - supplied breathing apparatus (SCBA) and anti - slip, anti - static clothing to safeguard their safety.

2. Environmental Protection Requirements

The abrasive recovery rate should be at least 90%. Waste abrasives must be disposed of in accordance with the IMDG Code. Regarding wastewater, it should undergo sedimentation and filtration before being discharged to prevent any negative impact on the marine ecosystem.

In conclusion, for offshore platform sandblasting equipment, safety and explosion - proof features are of utmost importance. At the same time, efficiency and environmental protection should not be overlooked. It is advisable to select either pressure - fed or recovery systems based on specific job requirements, including the size of the operation area, coating specifications, and platform conditions. Regular maintenance and operator training are also critical to ensure the long - term reliable operation of the equipment.

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