Container classification

It is a liquid at the design temperature, so it cannot be classified in this way.

Please take a look at the following: Containers with a pressure range of 0.1~1.6 Mpa are low-pressure containers. (I) Category I pressure containers: Low-pressure containers, except those specified in items (II) and (III). (II) Class II pressure vessels (one of the following situations, except as specified in paragraph (III)): (1) Medium-pressure vessels ； (2) Low-pressure vessels (only for media with extremely high and high toxicity) ； (3) Low-pressure reaction vessels and low-pressure storage vessels (only for flammable media or media with moderate toxicity) ； (4) Low-pressure shell-and-tube waste heat boiler ； (5) Low-pressure glass-lined pressure vessels. (III) Class III pressure vessels (one 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 pV greater than or equal to 10 MPa·m3) ； (4) Medium-pressure reaction vessel (only for flammable or moderately hazardous media with pV greater than or equal to 0.5 MPa·m3) ； (5) Low-pressure vessels (only for media with extremely high or high toxicity levels, and where pV is greater than or equal to 0.2 MPa·m3) ； (6) High-pressure and medium-pressure shell-and-tube waste heat boilers ； (7) Medium-pressure fiberglass-lined containers ； (8) Pressure vessels manufactured from materials with a high strength level (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) ； (10) Spherical storage tanks (volume greater than or equal to 50 m3) ； (11) Low-temperature liquid storage containers (capacity greater than 5 m3).

I would like to add some clarification to the classification proposed by the poster on the 3rd floor: In the aforementioned classification method, the \"toxicity level of chemical agents\" is divided into four categories according to the provisions of GB5044 \"Standards for Occupational Exposure to Toxic Substances\": I – extremely hazardous, II – highly hazardous, III – toxic, IV – slightly hazardous； In the PV product, P represents the design pressure, while V represents the geometric volume of the pressure vessel, rounded after deducting the volume of the internal components

Whether to classify or not depends on the operating pressure, rather than the design pressure, as well as on the properties of the medium.

Trichlorosilane SiHCl3 1. Aliases • English names: silicon chloroform, silane, trichlorosilane； Trichlorosilane, Silicochloroform. 2. Uses: Raw material for single-crystal silicon, epitaxial growth, silicon melt, silicone oil, chemical vapor deposition, production of silicon compounds, electronic gases. 3. Preparation method: (1) Si reacts with HCl at high temperature. (2) Reduction of silicon tetrachloride with hydrogen (using an aluminum-containing catalyst). 4. Physical and chemical properties Molecular weight: 135.43 Melting point (101.325 kPa): -134℃ ； Boiling point (101.325 kPa): 31.8℃ ； Liquid density (0°C): 1350 kg/m3 ； Relative density (gas, air=1): 4.7 ； Vapor pressure (-16.4°C): 13.3kPa ； (14.5℃): 53.3kPa ； Ignition point: -27.8℃ ； Autoignition point: 104.4℃ ； Flash point: -14℃ ； Lower explosion limit: 9.8% ； Toxicity level: 3 ； Flammability rating: 4 ； Explosivity level: 2. Trichlorosilane is a colorless and transparent liquid that is highly volatile, flammable, and has an irritating, foul odor under normal temperature and pressure conditions. It burns very easily in air, and there is a risk of ignition at temperatures below -18°C. It burns vigorously when exposed to an open flame, producing red flames and white smoke, with SiO2, HCl, and Cl2 being formed: SiHCl3 + O2 → SiO2 + HCl + Cl2 ； Vapors of trichlorosilane can form explosive mixtures with air over a wide range of concentrations, leading to violent explosions when heated. Its thermal stability is better than that of dichlorosilane; at 900°C, it decomposes to produce toxic hydrogen chloride fumes, as well as Cl2 and Si. It should be category two!

Trichlorosilane is a colorless and transparent liquid that is highly volatile, easily flowable, and has an irritating foul odor at normal temperature and pressure. It burns very easily in air, and there is a risk of ignition even at temperatures below -18°C. When exposed to an open flame, it burns vigorously, producing red flames and white smoke; the products formed are SiO2, HCl, and Cl2. The boiling point of SiHCl3 at 101.325 kPa is 31.8°C. The design pressure for this storage tank is 0.4 MPa, with a design temperature of 50 degrees Celsius. The medium stored in this tank is SiHCl3. According to HG20600-2000 “Classification of Toxicity and Explosive Hazards of Chemical Media in Pressure Vessels”, trichlorosilane is considered an explosive-hazardous medium as well as a medium that poses poisoning risks. If this tank is classified as a storage vessel, it belongs to category II; otherwise, it belongs to category I.

The classification of containers takes into account the maximum operating pressure and maximum operating temperature, rather than the design pressure and design temperature. Last edited by deus on 2009-2-25 15:53.]

Correction. HG20660-2000 \"Classification of Toxicity Hazards and Explosion Risks of Chemical Media in Pressure Vessels\"

A liquid with a standard boiling point refers to a “potential gas””

The maximum operating pressure is only used when determining whether it falls within the scope of the Pressure Vessel Code; the classification is based on the design pressure.

Whether to classify or not depends on the operating pressure, rather than the design pressure, as well as on the properties of the medium. This is too amateurish; the regulatory standards clearly specify the design pressure.

What was said on the 7th floor is clear; now the key is to see whether its operating pressure is >=0.1MPa

Whether to classify a container or not should be based on certain criteria; these are the requirements specified in the regulations for containers that meet \"three conditions\": namely, the maximum operating pressure, the maximum diameter of the container or the PV value (design pressure * volume), and whether the medium is a gas. Only when all three aforementioned conditions are met can such a container be considered a pressure vessel and be subject to the Regulations on Pressure Vessels. Next is, which category does this pressure vessel fall into? The category of such pressure vessels should be determined based on factors such as the design pressure of the vessel, the flammability and toxicity of the working medium, the manufacturing process of the vessel, and its classification. So, set the threshold first, and then evaluate the categories.

I need to correct a statement: classification is based on the design pressure; refer to page 9 of the regulations, where p represents the design pressure

It should be classified as such: under the design pressure and design temperature specified by the poster, the boiling point of that medium has been reached. Additionally, this medium is flammable and explosive. If the equipment is used for storing this medium, it should be classified as Category II; if it is a process vessel, such as a buffer tank or a regeneration tank, it should be classified as Category I

As a supplementary note, the maximum operating pressure is 0.3 MPa, the operating temperature is 40 degrees, and the medium is SiHCl3. I would like to know what type of container this metering tank belongs to

The poster provided too few parameters, so an accurate judgment cannot be made

In fact, to determine the classification, one should first check whether it falls under the scope of relevant regulatory requirements and whether the working pressure is ≥0.1 MPa; thereafter, classification is carried out based on the design pressure, as well as considering the medium, volume, and material used.

Whether to classify or not depends on the operating pressure, not the design pressure, as well as on the properties of the medium