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Control Points in the Manufacturing and Installation Process
The destruction of pressure vessels at low temperatures is influenced not only by the quality of the steel but also by manufacturing and installation defects causing internal stress concentration.
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The destruction of pressure vessels at low temperatures is influenced not only by the quality of the steel but also by manufacturing and installation defects causing internal stress concentration. Stress concentration at low temperatures, combined with overall membrane and bending stresses, can lead to high localized stress levels, causing sudden brittle fractures.
- Precise Material Processing: Strict adherence to calculated dimensions during steel plate cutting ensures accurate vessel formation. Secondary cutting for heads and spherical shell plates maintains precision.
- Reducing Cold Working Hardening: Excessive cold working can increase strength and hardness while reducing plasticity and toughness, raising the risk of low-temperature brittle failure. Control of cold plastic deformation rates and multiple rolling for vessel bodies are essential.
- Uniform Deviation Distribution: When assembling, distribute deviations evenly, preventing shape mutations and reducing stress concentration.
- No Steel Stamping on Vessel Surfaces: Avoid using steel stamps on vessel surfaces; instead, use paint for identification.
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