Which pressure vessels belong to category III vessels?

This post was last edited by ZZJJAA70 on 2009-11-26 at 17:32. The \"Regulations on Safety Inspection of Pressure Vessels\" stipulate that a vessel falls under Category III pressure vessels in any of the following situations: (1) High-pressure vessels； (2) Medium-pressure vessels (only for media with extremely high and high toxicity) ； (3) Medium-pressure storage vessels (only for flammable or moderately hazardous media, with a PV product greater than 10 Mpa·m3); (4) Medium-pressure reaction vessels (only for flammable or moderately hazardous media, with a PV product greater than or equal to 0.5 Mpa·m3); (5) Low-pressure vessels (for extremely hazardous or highly hazardous media, with a PV product greater than or equal to 0.2 Mpa·m3) ； (6) High-pressure and medium-pressure shell-and-tube waste heat boilers ； (Note 4) (7) Medium-pressure glass-lined pressure vessels ； (8) Pressure vessels manufactured from materials with a high strength grade (meaning that the minimum specified value for tensile strength in the relevant standards is 540 Mpa or higher) ； (9) Mobile pressure vessels, including railway tank cars (for liquefied gases and cryogenic liquids), tank trucks, and tank containers (for liquefied gases and cryogenic liquids), etc ； (10) Spherical storage tanks (volume greater than or equal to 50 m3) ； (11) Low-temperature liquid storage tanks (volume greater than 5 m3).

The synthesis tower in ammonia synthesis, as well as 40m3 or 100m3 liquid ammonia storage tanks, all belong to category III containers.

This post was last edited by luohx on 2009-11-26 at 13:35. Training material for pressure vessel operators – \"Knowledge of Safe Operation of Pressure Vessels\", 2nd edition, edited by Li Chunshu, published by Tianjin Academy of Social Sciences Press. Category 3 pressure vessels: 1. High-pressure vessels； 2. Medium-pressure reaction vessels with flammable media or toxic media that present a moderate hazard level, and where P*V >= 0.5 MPa·m3, as well as medium-pressure storage vessels with such media where P*V >= 10 MPa·m3 ； 3. Medium-pressure vessels whose toxicity level is that of highly hazardous substances, and low-pressure vessels with P*V >= 0.2 MPa·m3 ； 4 High-pressure and medium-pressure shell-and-tube waste heat boilers ； 5. Medium-pressure glass-lined pressure vessels ； 6. Pressure vessels manufactured from materials with a high strength level (i.e., whose specified minimum tensile strength value according to the relevant standards is 540 MPa or higher) ； 7. Mobile pressure vessels, including railway tank cars (for liquefied gases and cryogenic liquids), tank trucks (for transporting liquefied gases, cryogenic liquids, and permanent gases), and tank containers (for liquids, gases, and cryogenic liquids) ； 8. Spherical vessels (volume greater than or equal to 50 m3) ； 9. Low-temperature liquid storage containers (capacity greater than or equal to 50 m3).

The classification of pressure vessels should first be carried out based on the properties of the medium; the appropriate classification chart is selected accordingly, and then coordinates are determined using the design pressure p (in MPa) and volume V (in L) to identify the vessel category