Classification Of Three Types Of Pressure Vessels

Three types of containers. The three types of containers meet one of the following conditions:

(1) High pressure vessel;

(2) Medium-pressure containers (the degree of toxicity is extremely and highly hazardous media);

(3) Medium-pressure storage container (a medium that is flammable or toxic with a moderately hazardous degree, and the product of design pressure and volume PV≥10MPa·m3;

(4) Medium-pressure reaction vessel (inflammable or toxic medium is moderately hazardous, and PV≥0.5MPa·m3;

(5) Low-pressure container (toxicity is extremely and highly hazardous media, and PV≥0.2MPa·m3;

(6) High-pressure and medium-pressure shell-and-tube waste heat boiler;

(7) Medium-pressure glass-lined pressure vessel;

(8) Pressure vessels made of materials with higher strength levels (the lower limit of the specified tensile strength value is greater than or equal to 540MPa;

(9) Mobile pressure vessels, including railway tank cars (liquefied gas, cryogenic liquid medium), tank cars (liquefied gas, cryogenic liquid or permanent gas transport vehicle) and tank containers (liquefied gas, cryogenic liquid medium), etc. ;

(10) Spherical storage tank (volume V≥50m3);

(11) Cryogenic liquid storage container (V≥5m3)

Second-class container. Those that meet one of the following conditions and are not covered by paragraph 1 are classified as Class II containers:

(1) Medium pressure vessel;

(2) Low-pressure container (the degree of toxicity is extremely and highly hazardous media);

(3) Low-pressure reaction vessel and low-pressure storage vessel (flammable medium or medium with moderate toxicity);

(4) Low-pressure shell-and-tube waste heat boiler;

(5) Low-pressure glass-lined pressure vessel.

A type of container. Low-pressure container and not covered by paragraph 1 and 2.

The toxicity level of the chemical medium in the pressure vessel and the classification of the flammable medium can refer to the relevant regulations, or according to the following principles:

High allowable concentration <0.1mg/m3 is extremely hazardous (level I);

The high allowable concentration of 0.1~<1.0mg/m3 is highly hazardous (level Ⅱ);

The high allowable concentration is 1.0~<10mg/m3, which is a moderate hazard (Class Ⅲ);

The high allowable concentration is ≥10mg/m3, which is a mildly hazardous toxic medium (level IV).

The mixture of medium and air whose lower explosive limit is less than 10% or the difference between the upper explosive limit and the lower limit> 20% is a flammable medium.