How to determine if the wall temperature of a pressure vessel meets the standard?

1. Design Temperature and Material Limitations
The design temperature of the pressure vessel is the core basis for determining whether the wall temperature meets the standard. The vessel wall temperature must meet the following requirements:
Minimum temperature: Not lower than the lower limit of the design temperature (usually ≥-20℃);

Maximum temperature: Not exceeding the upper limit of the design temperature (usually ≤150℃).

2. Inspection and Evaluation Process

Comprehensive Inspection: Inspect the wall thickness and material condition using non-destructive testing (such as ultrasonic and radiographic testing) to confirm the absence of defects such as cracks and bulges. If defects such as intergranular corrosion are found, the inspection cycle must be adjusted or repairs made according to the safety status level (Level 1-5).

Safety Assessment: For vessels exceeding their design service life, a serviceability evaluation (safety assessment) is required to verify whether the material performance meets the requirements of the current operating conditions.

Operational Monitoring: After resuming operation, continuous monitoring of wall temperature fluctuations is required to ensure they remain within the design range, and any abnormalities must be recorded.

3. Special Media and Material Requirements

Toxic Media Containers: Containers containing extremely/highly hazardous media must have wall temperatures strictly conforming to design values, and welded joints must undergo 100% non-destructive testing.

High-Strength Steel Containers: Materials with a standard tensile strength ≥540MPa must pass all non-destructive testing to verify wall temperature adaptability.