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The Pressure Vessel Has Mechanical Properties
Jul 06, 2017


The pressure vessel is a sealed container which has internal or external gas or liquid pressure and has high safety requirements.

The pressure vessel is mainly cylindrical, a few spherical or other shapes. Cylindrical pressure vessel is usually composed of cylinder, head, take over, Pressure Vessel and Pressure Pipe Component flange and other parts and components, the higher the pressure of the pressure vessel, the wall of the cylinder should be thicker.

Classification of pressure vessels

Press the pressure level classification: pressure vessel can be divided into internal pressure vessel and external pressure vessel.

The internal pressure vessel can be divided into four pressure grades according to the design pressure (p), which is divided as follows:

Pressure Vessel and Pressure Pipe Component Low pressure (code L) container 0.1 MPa ≤ p <1.6 MPa;

Medium pressure (code M) container 1.6 MPa ≤ p <10.0 MPa;

High pressure (code H) container 10 MPa ≤ p <100 MPa;

Ultra high pressure (code U) container p ≥ 100MPa.

According to the role of the container in the production classification:

Reaction pressure vessel (code R): used to complete the physical and chemical reactions of the media.

Heat exchange pressure vessel (code E): used to complete the heat exchange of media.

Separate pressure vessel (code S): used to complete the fluid pressure balance buffer and gas purification separation.

Storage pressure vessel (code C, in which the ball tank code B): for storage, containing gas, liquid, liquefied gas and other media.

In a pressure vessel, Pressure Vessel and Pressure Pipe Component if two or more processes are applied at the same time, the breed should be divided according to the main role of the process.

Sort by installation:

Fixed pressure vessel: fixed installation and use of the location, process conditions and the operator is also more fixed pressure vessel.

Mobile pressure vessels: not only under pressure to withstand internal pressure or external pressure, the handling process will be due to the internal media caused by the impact of rocking, Pressure Vessel and Pressure Pipe Component as well as the transport process to bring the external impact and vibration load, and therefore in the structure, use and safety Aspects have their own special requirements.

The above-mentioned classification methods only take into account a pressure vessel of a design parameters or the use of conditions, can not fully reflect the risk of pressure vessels.

The risk level of the pressure vessel is also related to the risk of the medium and its design pressure p and the total volume V. The greater the pV value, Pressure Vessel and Pressure Pipe Component the greater the explosive energy when the container breaks, and the greater the damage, the design, Inspection, use and management requirements of the higher.

Use a pressure vessel made of a material with a higher strength level (the lower limit of the tensile strength specified in the corresponding standard is greater than or equal to 540 MPa)

Mobile pressure vessels, including rail tankers (medium for liquefied gas, cryogenic liquids), tank cars [liquefied gas transport (semi-trailer), low temperature liquid transport (semi-trailer), permanent gas transport (semi-trailer) Tank containers (medium for the liquefied gas, low temperature liquid);

Spherical tank (volume greater than or equal to 50m3); cryogenic liquid storage container (volume greater than 5m3).

Cryogenic liquid storage container (volume greater than 5m3)

The choice of pressure vessel should take into account the mechanical properties of the material, Pressure Vessel and Pressure Pipe Component chemical properties, physical properties and process performance.

Pressure vessel pressure element steel, should be oxygen converter or electric furnace smelting of sedimentary steel.

Low-alloy steel sheet and austenitic-ferritic stainless steel sheet with a standard tensile strength lower than or equal to 540 MPa, and low temperature steel and low temperature steel forgings for temperatures below -20 ° C should also be used Furnace refining process.