Container House Risk Assessment

Risk assessment of container houses should focus on potential risks in the design, manufacturing, use, and regulatory aspects, specifically including structural safety, medium hazards, operational specifications, and compliance management.

1. Design-related Risks

For special containers (such as tank containers used for transporting saturated steam), it is essential to strictly adhere to analytical design methods. This includes specifying the lower limit of the standard tensile strength of the steel for the main pressure-bearing components of the tank (e.g., <540MPa), the design pressure (≤2.5MPa), and the design temperature (≤225℃). Design calculations should cover fatigue effect analysis of loads during loading, unloading, and transportation processes, and provide allowable values for design cycle counts and control requirements for pressure and temperature changes during filling. If the design does not consider conditions such as stress corrosion, overpressure, or collisions, it may lead to tank rupture risks.

2. Manufacturing-related Risks

During manufacturing, it is crucial to ensure welding quality. For example, Class A and B welded joints should be ground flush with the base material and undergo 100% radiographic testing or recordable ultrasonic testing, as well as 100% magnetic particle testing on both internal and external surfaces. Surface cracks, undercuts, lack of fusion, and other defects are strictly prohibited. The tank must undergo post-weld overall heat treatment, with the heat treatment process meeting the requirements of design documents and relevant standards. If there are defects in the manufacturing process, it may lead to aging damage or stress concentration in the tank, increasing the risk of rupture.

3. Use-related Risks

1. Medium Hazards: If the container is used for transporting special media (such as saturated steam), it is necessary to assess the corrosiveness of the medium to the tank and the consequences of flashing and explosion. For example, saturated steam may undergo flashing under overpressure or collision conditions, with an explosion equivalent of up to several hundred kilograms of TNT, causing severe damage to surrounding personnel and buildings.
2. Operational Specifications: The using unit must strictly implement registration requirements and is prohibited from changing the using unit. If operations are not carried out in accordance with specifications (such as failing to control filling pressure and temperature or not regularly inspecting the tank's condition), it may lead to safety accidents.

4. Regulatory-related Risks

1. Compliance Management: Manufacturing units must register contracts with the provincial market regulatory department before production. Production without contract registration is strictly prohibited. The using unit must ensure that the equipment is registered for use by the purchasing party specified in the contract; otherwise, registration will not be granted.
2. Risk Assessment and Emergency Response: It is necessary to identify damage such as stress corrosion that may be caused by saturated steam, assess the consequences of flashing and explosion, and propose targeted risk prevention measures and emergency response plans.