Are gas cylinders pressure vessels? The difference between a gas cylinder and a pressure vessel

Broadly speaking, pressure vessels generally refer to all closed vessels that bear a certain pressure, including fixed pressure vessels, mobile pressure vessels, gas cylinders, oxygen chambers, etc. So strictly speaking, gas cylinders belong to a type of pressure vessel.

However, the pressure vessel commonly referred to mainly refers to the fixed pressure vessel. The latest specification TSG 21-2016 stipulates that the following three conditions can be called a pressure vessel at the same time: (1) the working pressure is greater than or equal to; (2) The volume is greater than or equal to and the inner diameter (non-circular cross-section refers to the maximum size of the inner boundary of the cross-section) is greater than or equal to 150mm; (3) The containing medium is gas, liquefied gas and liquid with the maximum working temperature of the medium higher than or equal to its standard boiling point.

In order to distinguish it from general containers (atmospheric vessels), only containers that meet the following three conditions at the same time are called pressure vessels

1) The working pressure (Note 1) is greater than or equal to the working pressure, which refers to the highest pressure (gauge pressure) that the top of the pressure vessel may reach under normal working conditions); Without hydrostatic pressure) (2) The inner diameter (non-circular cross-section refers to its maximum size) is greater than or equal to. And the volume (v) is greater than or equal to cubic meters, and the product of the working pressure and the volume is greater than or equal to the volume, which refers to the geometric volume of the pressure vessel);

(3) The containing medium is gas, liquefied gas and liquid with the maximum working temperature of the medium higher than or equal to its standard boiling point.

The differences between gas cylinders and pressure vessels are as follows:

The difference between the two is first of all that the scope of definition is different, gas cylinders belong to mobile pressure vessels, but Jing Rent Yuan is a mobile pressure vessel is not the same as gas cylinders.

Secondly, the working pressure is different, and the working pressure of the mobile pressure vessel is generally not high, usually around more than ten kilograms. The working pressure range of gas cylinders is very large, and the low pressure is a few kilograms, and the high pressure can exceed more than 100 kilograms. Finally, there is a difference in the hazard, and gas cylinders are far more dangerous than mobile pressure vessels.

Pressure Cylinder Basics:

The gas cylinder belongs to the mobile refillable pressure vessel, because it has some special problems in use, so to ensure safe use, in addition to requiring it to meet the general requirements of the pressure vessel shirt, there are also some special requirements. For the sake of distinction, cylinder-type metal or non-metal closed containers with a volume of no more than 1,000 liters (commonly used 35 or 60 liters) for storing and transporting permanent gases, liquefied gases, dissolved gases or adsorbed gases are called gas cylinders.

Cylinders that are not used as pressure vessels for the storage and transportation of the above-mentioned gases are not considered gas cylinders, but pressure vessels. <>

Question 1: Why do gas cylinders not belong to the safety and technical supervision regulations of pressure vessels The full name of the new regulations is "safety and technical supervision regulations for fixed pressure vessels".

Note: It is fixed...

The cylinders are obviously mobile...

Question 2: Are oxygen cylinders and acetylene cylinders pressure vessels? Yes, definitely.

Question 3: Do oxygen cylinders and acetylene cylinders belong to special equipment Oxygen cylinders are divided into two types: 40L and 10L. The height is 150cm

The acetylene bottle is 40 l. The height is 100cm

Both of these are high-pressure cylinders. The material is carbon steel.

It belongs to the category of gas cylinders in special equipment pressure vessels, and the specific concept is (the concept of gas cylinders): pressure vessels refer to closed equipment containing gas or liquids and carrying a certain pressure, and its scope is specified as the maximum working pressure is greater than or equal to the gauge pressure), and the product of pressure and volume is greater than or equal to the fixed container and mobile container of gas, liquefied gas and liquid with a maximum working temperature higher than or equal to the standard boiling point; Gases, liquefied gases and gas cylinders with a standard boiling point equal to or lower than 60 liquids with a nominal working pressure greater than or equal to gauge pressure, and the product of pressure and volume greater than or equal to the volume; Oxygen chamber iso-excited.

It belongs to special equipment.

Question 4: What kind of pressure vessel does the oxygen storage tank belong to? In order to distinguish it from general containers (atmospheric vessels), only containers that meet the following three conditions at the same time are called pressure vessels

1) The working pressure is greater than or equal to the working pressure, which refers to the highest pressure (gauge pressure) that the top of the pressure vessel may reach under normal working conditions; Without hydrostatic pressure) (2) The inner diameter (non-circular cross-section refers to its maximum size) is greater than or equal to. and the volume (v) is greater than or equal to cubic meters, and the product of the working pressure and the volume is greater than or equal to the volume concession volume, which refers to the geometric volume of the pressure vessel); 3) The medium is gas, liquefied gas and the liquid with the maximum working temperature of the medium higher than or equal to its standard boiling point.

Question 5: As a pressure vessel, what does the safe use of gas cylinders include Hello, about the safe use of gas cylinders, as follows:

1. Gas cylinders should be dedicated to special cylinders, and cannot be modified at will, and various barometers should not be mixed;

2.Gas cylinders should be stored in a cool, dry place, away from heat sources, and the distance between flammable gas cylinders and open flames should not be less than 5 meters; Flammable cylinders are best stored in isolation;

3.When handling gas cylinders, they should be light and stable, and they should be placed firmly;

4.During operation, the oxygen cylinder is strictly forbidden to be oiled;

5.Do not use up the gas cylinders to prevent backfilling;

6.When opening the valve, you should stand on the side of the barometer, and do not aim the main valve of the cylinder at the head or body, in case the valve or barometer rushes out and injures people.

In addition, gas cylinders do not belong to pressure vessels.

Hope, thank you. Question 6: Is the gas cylinder a mobile pressure vessel? Mobile pressure vessel refers to a transportation device composed of a tank or a large-volume steel seamless gas cylinder (referred to as a gas cylinder) and a running device or frame that is permanently connected, including railway tank cars, automobile tank cars, long-tube trailers, tank containers and tube bundle containers.

Summary. Hello, the high-pressure cylinder capacity has nothing to do with the air pressure. The pressure and capacity of a high-pressure gas cylinder are two different things, the capacity is the size of the actual internal space of the bottle, for example, a 10-liter cylinder, 10 liters of water can be filled, and only 10 liters of gas can be filled, and the capacity of a container cannot be changed (a balloon can not be counted as a "container"); Because the gas can be compressed, the volume of the gas decreases after compression, but the pressure increases, so the compressed gas needs a "high-pressure gas cylinder", that is, a container that can withstand large pressure to store, and the high-pressure gas released from the pressure vessel (high-pressure cylinder), the volume increases after the pressure decreases, such as a 10-liter high-pressure cylinder, filled with 10 pressures of compressed air, when the air is released to become atmospheric air, it is theoretically equivalent to 10 times 10 liters, that is, 100 liters of air.

Therefore, the volume of air that the cylinder can provide for the diver to breathe is greater than the volume of the cylinder.

Hello, the high-pressure cylinder capacity has nothing to do with the air pressure. The pressure and capacity of a high-pressure gas cylinder are two different things, the capacity is the size of the actual internal space of the bottle, for example, a 10-liter cylinder, 10 liters of water can be filled with water, and only 10 liters of gas, and the capacity of a container cannot be changed (a balloon can not be counted as a "container"); Because the gas can be compressed, the volume of the gas decreases after compression, but the pressure increases, so the gas that is compressed or mu needs a "high-pressure gas cylinder", that is, a container that can withstand large pressure to store, and the high-pressure gas released from the pressure vessel (high-pressure cylinder), the volume increases after the pressure decreases, such as a 10-liter high-pressure cylinder, filled with 10 pressures of compressed air, when the air is released to become atmospheric pressure air, it is theoretically equivalent to 10 times 10 liters, that is, 100 liters of air. Therefore, the volume of air that the cylinder can provide for the diver to breathe during diving is greater than the volume of the cylinder.

2.Atmospheric pressure is the atmospheric pressure acting on the unrented volume of the unit surface row, that is, the gravitational force that is numerically equal to the vertical air column that extends upward to the upper boundary of the atmosphere per unit area. The famous Magdeburg hemispheric experiment proves its existence.

The international unit of barometric pressure is Pascal, referred to as Cha Pa, and the symbol is Pa

In a broad sense, gas cylinders should include disposable or refillable mobile pressure vessels with different pressures, different volumes, different structural forms and different materials for the storage and transportation of permanent gases, liquefied gases and dissolved gases.

The gas cylinder is a mobile pressure vessel, which mainly requires the filling unit to be qualified, and shall not be filled with expired gas cylinders.

The safety management of fixed pressure vessels requires that the equipment has the production qualification of the unit manufacturing, the operator is certified, the operating procedures and management system are complete.

Precautions for the use of pressure vessels:

1. When the pressure vessel leaves the factory, it shall be accompanied by "design documents required by safety technical specifications, product quality qualification certificate, safety and use and maintenance instructions, and supervision and inspection certificate (safety performance supervision and inspection certificate)".

2. Installation, transformation and repair of pressure vessels. Units engaged in the installation, transformation and repair of pressure vessels shall obtain the qualification certificate for the transformation, installation and maintenance of special equipment issued by the provincial market supervision bureau before they can engage in the installation, transformation and repair of pressure vessels at the corresponding level. Units holding pressure vessel manufacturing licenses can be engaged in the installation and transformation of pressure vessels of the corresponding level.

3. Supervision and inspection of pressure vessel installation, transformation and major repair. For the installation of fixed pressure vessels, only the installation of oxygen chambers needs to be supervised and inspected, and the transformation and major maintenance of pressure vessels need to be supervised and inspected.

4. Registration of the use of pressure vessels. When using pressure vessels, the user must register for use in accordance with the provisions of the "Rules for the Administration of Registration of the Use of Special Equipment" and apply for the "Registration Certificate for the Use of Special Equipment".

5. The operation of the pressure vessel. The operation of the quick-opening pressure vessel must be carried out by the certified personnel who have been trained and qualified and obtained the "Special Equipment Operator Certificate".

6. Periodic inspection of pressure vessels. The first periodic inspection shall be carried out after the new pressure vessel is put into use for 3 years, and the regular inspection is generally carried out once every 3 years, and the annual inspection shall be carried out once every 1 year, and the pressure vessel shall not be used without regular inspection.

The safety accessories of the pressure vessel are calibrated once a year, and the pressure gauge is verified once every six months, and the safety accessories that have not been inspected shall not be used. <>

The cylinders containing compressed gas and liquefied Shiqing gas belong to the pressure vessel packaging and have special safety technical specifications TSG 23-2021.