How Pressure Vessels Are Classified in the Capacity Regulation
To streamline safety management and regulatory oversight, the "Capacity Regulation" categorizes containers into three types based on pressure level, medium harm, and production role:
Class I Pressure Vessels:
Low-pressure vessels (excluding Class II and Class III).
Class II Pressure Vessels:
1. Medium-pressure vessels (excluding Class III).
2. Low-pressure reaction and storage vessels with flammable or moderately hazardous media.
3. Low-pressure containers with extremely toxic and highly hazardous media.
4. Low-pressure shell-and-tube waste heat boilers.
5. Low-pressure glass-lined pressure vessels.
6. Class III Pressure Vessels:
1. High-pressure vessels.
2. Medium-pressure reaction vessels with flammable or medium-toxic media and p•V ≥ 0.5MPa•m³, and medium-pressure storage vessels with p•V ≥ 10MPa•m³.
3. Medium-pressure containers with extremely or highly toxic media and low-pressure containers with p•V ≥ 0.2MPa•m³.
4. High and medium-pressure shell-and-tube waste heat boilers.
5. Medium-pressure glass-lined pressure vessels.
6. Pressure vessels made of materials with a higher strength level (tensile strength ≥ 540MPa).
7. Mobile pressure vessels, including railway tank cars (liquefied gas, cryogenic liquid), tank cars (liquefied gas transportation, cryogenic liquid transportation, permanent gas transportation), and tank containers (liquid gas, cryogenic liquid).
8. Spherical containers (volume ≥ 50m³).
9. Cryogenic liquid storage containers (volume ≥ 5m³).
Class I Pressure Vessels:
Low-pressure vessels (excluding Class II and Class III).
Class II Pressure Vessels:
1. Medium-pressure vessels (excluding Class III).
2. Low-pressure reaction and storage vessels with flammable or moderately hazardous media.
3. Low-pressure containers with extremely toxic and highly hazardous media.
4. Low-pressure shell-and-tube waste heat boilers.
5. Low-pressure glass-lined pressure vessels.
6. Class III Pressure Vessels:
1. High-pressure vessels.
2. Medium-pressure reaction vessels with flammable or medium-toxic media and p•V ≥ 0.5MPa•m³, and medium-pressure storage vessels with p•V ≥ 10MPa•m³.
3. Medium-pressure containers with extremely or highly toxic media and low-pressure containers with p•V ≥ 0.2MPa•m³.
4. High and medium-pressure shell-and-tube waste heat boilers.
5. Medium-pressure glass-lined pressure vessels.
6. Pressure vessels made of materials with a higher strength level (tensile strength ≥ 540MPa).
7. Mobile pressure vessels, including railway tank cars (liquefied gas, cryogenic liquid), tank cars (liquefied gas transportation, cryogenic liquid transportation, permanent gas transportation), and tank containers (liquid gas, cryogenic liquid).
8. Spherical containers (volume ≥ 50m³).
9. Cryogenic liquid storage containers (volume ≥ 5m³).
