Musashi Engineering, Inc.
Pressure vessels play an important role in many industries, and their correct understanding and safe use are required. Pressure vessels are mainly used to hold liquids and gases at high pressure, and are widely used in the Chemical Industry, Petroleum and Food industries. In order to ensure safety and applicability, it is necessary to have deep knowledge of design standards and usage.
In this column, we will explain the types of pressure vessels and our proposed products.
Pressure vessels can be broadly classified into Type 1 pressure vessels and Type 2 pressure vessels. By understanding the characteristics, the optimal pressure vessel can be selected according to the appropriate application.
Class 1 pressure vessels and Class 2 pressure vessels each have different design standards and regulations, so appropriate selection is required according to the application and the pressure they are handled. Since first-class pressure vessels often handle high-pressure gas, strict safety standards are required by design. For example, reactors and boilers in chemical factories are designed as Type 1 pressure vessels to withstand high temperatures and high pressures and to prevent leakage of contents.
On the other hand, Type 2 pressure vessels often handle lower pressure compared to Type 1, so safety standards are also acceptable. Type 2 pressure vessels are applied to applications that are relatively safe, such as household gas cylinders and compressed air tanks for small and medium-sized enterprises. As a result, cost and ease of installation are often prioritized.
Thus, when choosing a pressure vessel, it is important to carefully consider its application and required pressure conditions. By selecting an appropriate type of pressure vessel, it is possible to achieve efficient operation while ensuring safety. Understanding the difference between Type 1 pressure vessels that handle high pressure and Type 2 pressure vessels that can ensure safety at low pressure is essential for the selection and operation of appropriate equipment.
The Type 1 pressure vessel is a large pressure vessel that does not fall under any of the (simple) containers and small pressure vessels specified in Article 1, Item 5 of the Ordinance for Enforcement of the Industrial Safety and Health Act. Inspection by prefectural labor bureaus at each stage of import, installation, etc. is required. After the start of use, a performance inspection by a registered performance inspection organization is required once a year.
Article 1, Item 5 of the Industrial Safety and Health Law Enforcement Order
The following containers (containers used with a gauge pressure of 0.1 MPa or less, with an internal volume of 0.04 m3 or less, or with an inner diameter of 200 mm or less and a length of 1000 mm or less, and the maximum gauge pressure used by MPa is the numerical value representing MPa and the internal volume of m3).
B. Containers that accept the heat medium of steam Other or generate steam to heat solids or liquids whose pressure in the container exceeds atmospheric pressure (excluding containers listed in (b) or (c))
(B) Containers that generate steam due to chemical reactions in containers and nuclear reactions by the Other and whose pressure inside containers exceeds atmospheric pressure.
(C) A container that heats the liquid and generates steam in order to separate the components of the liquid in the container, and whose pressure in the container exceeds atmospheric pressure.
In addition to the containers listed in ni to c, containers that hold liquids at temperatures above the boiling point at atmospheric pressure inside them.
Figures show the application categories in the figure below.
(1) Classification by maximum operating pressure and internal volume
(2) Classification by inner diameter and length of the body (maximum operating pressure ≤ 0.1 MPa)
Type 2 pressure vessel is a pressure vessel specified in Article 1, Item 7 of the Ordinance for Enforcement of the Industrial Safety and Health Act, and is a pressure vessel larger than a (simple) container. It is mandatory to undergo individual certification at the time of manufacture, manufacture or import based on the Type 2 pressure vessel structure standard, and to conduct regular voluntary inspections once a year.
Article 1, Item 7 of the Ordinance for Enforcement of the Industrial Safety and Health Act
Type 2 Pressure Vessels (excluding Type 1 Pressure Vessels) that hold gas with a gauge pressure of 0.2 MPa or more inside the vessel (excluding Type 1 Pressure Vessels).
B. Containers with an internal volume of 0.04 m3 or more
(B) Containers with an inner diameter of 200 mm or more and a length of 1000 mm or more
Figures show the application categories in the figure below.
(1) Classification by maximum operating pressure and internal volume
(2) Classification by the inner diameter and length of the torso
Please refer to the following link for detailed information on the applicable categories of various pressure vessels.
・(https://www.jbanet.or.jp/en/examination/classification/vessel-1/) (in Japanese) (in Japanese).
・Applicable categories of Type 2 pressure vessels (Japan Boiler Association) (https://www.jbanet.or.jp/examination/classification/vessel-2/) (in Japanese).
Design standards and safety regulations for pressure vessels are very important to ensure product safety and user reliability. By complying with appropriate standards and regulations, it is possible to reduce risks and prevent accidents.
In the installation and operation of pressure vessels, it is necessary to comply with domestic and international regulatory standards and safety standards. These regulatory standards and safety standards are established to prevent accidents and ensure the safety of users. By following this, the risk can be minimized.
For example, in Japan, the inspection and certification of pressure vessels are required under the High Pressure Gas Safety Act. This law confirms that safety standards are met at each stage of manufacturing, installation, and use, and thoroughly implements accident prevention measures. On the other hand, "ASME boilers and pressure vessel codes" are widely recognized internationally and are being complied with in many countries. This code is formulated by the American Association of Mechanical Engineers (ASME) and provides detailed rules from design, material selection, manufacturing and testing.
When selecting a pressure vessel, it is important to select the appropriate size and material according to the purpose. The use of a pressure vessel that does not fit the purpose reduces safety and efficiency and increases the risk of accidents. Therefore, by selecting a material suitable for the application, it is possible to operate reliably over the long term.
For example, chemical factories often handle corrosive substances, so it is recommended to choose a stainless steel pressure vessel with high corrosion resistance. On the other hand, a lightweight and durable aluminum pressure vessel is suitable for air compressors. By choosing the right size and material, safety and efficiency can be ensured and long-term operation is possible.
It is important to maintain and manage pressure vessels regularly to detect problems early. Periodic inspection and maintenance work can detect deterioration and damage of the pressure vessel at an early stage and prevent accidents. In addition, operating costs can be reduced by preventing sudden failures.
The liquid tank of Musashi Engineering is a liquid tank that realizes continuous operation of large flow rate application.
We offer four types of safe lock tanks, straight one-touch tanks, one-touch tanks, and gallon tanks to accommodate a wide range of viscosity, properties, and applications of liquid materials. There are two types of liquid materials: direct input type and inner container type, with a wide range of sizes ranging from 0.5L to 38.5L, so choose the most appropriate tank according to daily usage. Can also be used for Filling liquid agent for syringe.
※We do not manufacture first-class pressure vessels.
※The following 124710 corresponds to the number in "Required components of the liquid tank" above.
①Tank sizeThe size is indicated in the effective volume of the tank. When using material cans or inner containers, be sure to check that the size is large.
②O-ring for lidsFor the O-ring, select a material that is difficult to swell according to the material to be inserted.
④Suction pipeThe suction pipes and liquid tubes vary greatly in diameter and length, respectively, with the flow rate.
⑩Piston for inner containers (for 1kg cans)
It is essential for pumping high viscosity materials.
The standard specification is a typical 1kg can.
Inner diameter: It is matched to the size of Φ108.
It is also possible to make custom-made products according to the container used by the customer.
※We will borrow a container (can be used) for measurement.
At Musashi Engineering, it is possible to propose solutions for these pressure vessels and application systems incorporating pressure vessels in line with customer needs.
Please feel free to contact us.
Recommended Catalog
Part accessories & valve/tank catalog
Valve tank