ASME B16.20 is an American Society of Mechanical Engineers (ASME) standard that covers metallic gaskets for pipe flanges. It specifies the materials, dimensions, tolerances, and markings for ring-joint, spiral-wound, and metal-jacketed gaskets. These gaskets are dimensionally appropriate for use with flanges described in ASME B16.5, ASME B16.47, API Specification 6A, and ISO 10423 reference flange standards. Asme standards for oil and gas industry from this source
The main difference between ASME B16.20 and B16.21 is that B16.20 covers metallic gaskets, while B16.21 covers nonmetallic gaskets.
Types of gaskets covered by ASME B16.20
Ring-joint gaskets: These are the simplest type of gasket and consist of a metal ring that is compressed between the flange faces. Ring-joint gaskets are typically used in low-pressure applications.
Spiral-wound gaskets: These gaskets are made from a continuous strip of metal that is wound into a spiral shape. Spiral-wound gaskets are tough and long-lasting, making them ideal for high-pressure and high-temperature applications. They are also resistant to corrosion and chemicals.
Metal-jacketed gaskets: These gaskets consist of a metal ring that is covered with a layer of nonmetallic material, such as asbestos or rubber. Metal-jacketed gaskets are not as strong as spiral-wound gaskets, but they are more resistant to corrosion and chemicals.
Grooved gaskets: These gaskets have a series of grooves that are machined into the surface of the gasket. The grooves help to distribute the load evenly across the gasket, preventing it from tearing or leaking. Grooved gaskets are typically used in high-pressure applications.
ASME B16.20 also covers a number of other types of gaskets, such as bellows gaskets, elastomeric gaskets, and metallic gaskets with a nonmetallic insert.
ASME B16.20 is an important standard for the design and construction of piping systems. It ensures that metallic gaskets are properly manufactured and that they meet the required specifications for strength, durability, and safety.
Benefits of using ASME B16.20 gaskets
- They are strong and durable, making them suitable for use in high-pressure and high-temperature applications.
- They are resistant to corrosion and chemicals.
- They are easy to install and maintain.
- They are cost-effective.
What is the latest edition of of ASME B16.20
The latest edition of ASME B16.20 is the 2017 edition, which was published in December 2017. The 2017 edition includes a number of changes from the previous edition, including:
- Updated materials requirements
- Revised dimensions and tolerances
- New marking requirements
- Added information on gasket selection
- Updated references
The 2017 edition of ASME B16.20 is the most current and up-to-date version of the standard. If you are designing or constructing a piping system that uses metallic gaskets, you should use the 2017 edition of ASME B16.20 to ensure that your gaskets meet the required specifications.
What material is ASME B16.20
ASME B16.20 covers metallic gaskets for pipe flanges, and the materials used for these gaskets can vary depending on the application. However, some common materials used for ASME B16.20 gaskets include:
- Carbon steel
- Stainless steel
- Nickel alloys
- Copper alloys
- Graphite
- Other nonmetallic materials
The specific material used for a gasket will depend on the following factors
- The operating pressure and temperature of the system
- The type of fluid that will be flowing through the system
- The corrosiveness of the fluid
- The cost of the material
In general, carbon steel is the most common material used for ASME B16.20 gaskets because it is relatively inexpensive and easy to work with. However, stainless steel is often used for applications where corrosion resistance is important. Nickel alloys and copper alloys are also used for some applications, but they are more expensive than carbon steel and stainless steel.
Graphite is a nonmetallic material that is often used for ASME B16.20 gaskets because it is resistant to corrosion and chemicals. However, graphite is not as strong as metal gaskets, so it is not suitable for all applications.
Other nonmetallic materials that can be used for ASME B16.20 gaskets include asbestos, rubber, and plastic. These materials are not as strong as metal gaskets, but they are often used in applications where the pressure and temperature are not very high.
The material used for an ASME B16.20 gasket should be carefully chosen to ensure that it fits the application’s standards. The gasket should be strong enough to withstand the operating pressure and temperature of the system, and it should be resistant to corrosion and chemicals. The cost of the material should also be considered when making a selection.
What is the difference between ASME B16.20 and ASME B16.21
The main difference between ASME B16.20 and B16.21 is that B16.20 covers metallic gaskets, while B16.21 covers nonmetallic gaskets.
Below are the difference between ASME B16.2 and ASME B16.21
Feature | ASME B16.20 | ASME B16.21 |
Material | Metallic | Nonmetallic |
Types of gaskets | Ring-joint, spiral-wound, metal-jacketed | Flat gaskets |
Applications | High-pressure and high-temperature applications | High-pressure and high-temperature applications |
Strength and durability | Strong and durable | Not as strong or durable as metallic gaskets |
Resistance to corrosion and chemicals | Resistant to corrosion and chemicals | Not as resistant to corrosion and chemicals as metallic gaskets |
Cost | More expensive than nonmetallic gaskets | Less expensive than metallic gaskets |
In general, ASME B16.20 gaskets are used in applications where high pressure and high temperature are present. These gaskets are strong and durable, and they are resistant to corrosion and chemicals. However, they are also more expensive than nonmetallic gaskets.
ASME B16.21 gaskets are used in applications where low pressure and low temperature are present. These gaskets are not as strong or durable as metallic gaskets, but they are less expensive. They are also not as resistant to corrosion and chemicals as metallic gaskets.
What is the ASME standard for spiral wound gasket?
The ASME standard for spiral wound gasket is ASME B16.20. This standard covers metallic gaskets for pipe flanges, including spiral-wound gaskets. It includes requirements for materials, dimensions, tolerances, and markings for spiral-wound gaskets.
Spiral-wound gaskets are created by winding a continuous strip of metal into a spiral shape. The metal strip is typically made from carbon steel, stainless steel, or nickel alloy. The spiral windings are held together by a nonmetallic filler material, such as asbestos, graphite, or PTFE.
Spiral-wound gaskets are a versatile type of gasket that can be used in a variety of applications. They are strong and durable, making them suitable for use in high-pressure and high-temperature applications. They are also resistant to corrosion and chemicals. Spiral-wound gaskets are easy to install and maintain, and they are cost-effective.
ASME B16.20 specifies the following requirements for spiral-wound gaskets
Materials: The metal strip for spiral-wound gaskets must be made from a material that is suitable for the application. The filler material must also be compatible with the metal strip and the fluid that will be flowing through the system.
Dimensions: Spiral-wound gaskets must have specific dimensions that are consistent with the flanges they will be used with.
Tolerances: Spiral-wound gaskets must meet specific tolerances for dimensions, thickness, and weight.
Markings: Spiral-wound gaskets must be marked with the manufacturer’s name, the gasket type, the material, the pressure rating, and the date of manufacture.
If you are using spiral-wound gaskets in your piping system, it is important to ensure that they meet the requirements of ASME B16.20. This will help to ensure the safety and reliability of your system. Your can also refer Asme B31.2 from this source
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