1. Material Properties & Heat Resistance Limits
- Plastic expansion tanks – high‑strength engineering plastics typically withstand up to ~110°C.
- Industrial tanks – carbon steel or stainless steel offer higher heat tolerance for severe thermal loads.
- Material selection directly determines maximum operating temperature.
2. Pressure‑Bearing Design & Anti‑Boiling Mechanisms
- Robust pressure‑bearing design – pressurized cap automatically opens to release pressure when temperature spikes.
- Hot vapor vented into overflow pipe prevents violent boiling.
- Protects tank from rupturing due to overpressure.
3. Thermal Expansion/Contraction & Structural Stress
- Expansion space (safety margin) – essential to accommodate volumetric expansion of hot fluid.
- Inadequate design causes immense thermal stress on tank walls.
- Over time, leads to weld cracking or fatigue deformation in plastic tanks.
4. Thermal Aging Resistance & Corrosion Resistance
- Sustained high‑temperature environments – require long‑term thermal stability without embrittlement or strength loss.
- High temperatures intensify coolant‑induced corrosion on metal ports and seals.
- Use high‑temperature‑resistant specialty rubber seals to prevent leakage.