The ANSI flange standard is one of the most popular and widely used flange standards in many industrial systems. It serves to connect various types of equipment, accessories, industrial valves, pipelines, etc., facilitating efficient and safe production processes without leakage of fluids.
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The ANSI Stands For
ANSI (American National Standards Institute) is a non-profit organization established in 1918, headquartered in Washington, U.S, responsible for organizing, overseeing, and evaluating national standards in various fields to improve quality, enhance competitiveness, and expand markets worldwide.
As a matter of fact, ANSI evaluates products according to predetermined standards. Products recognized by this standard meet consistent requirements for characteristics and performance, fostering competition and conscientiousness in manufacturing processes, and promoting economic development. Additionally, products meeting ANSI ensure safety for user health.
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ANSI Flange Characteristics
ANSI flanges are made from various materials, typically those with good hardness, superior resistance to pressure and high temperatures, effective corrosion resistance, and long service life, such as stainless steel, steel, cast iron, copper, plastic...
ANSI flanges function to create a sturdy, durable connection to link various equipment, accessories, industrial valves, pumps, pipelines within a system, as well as forming a closed system without fluid leakage.
It can be said that these flanges are among the most superior flange standards. Their working temperature can reach up to 400 degrees Celsius, and they can withstand considerable working pressure, usually ranging from 150LB to 2500LB (equivalent to 20bar to 420bar). This type of flange is suitable for large-scale systems, large pipes, and high-pressure systems.
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Classification of ANSI Flange Standards
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The most commonly used type of ANSI flange is ANSI B16.5, produced with a working pressure range from Class 150 to Class 2500.
Generally, the number of bolt holes and the diameter of this type of flange in the ANSI B16.5 standard are specified as follows:
| CL 150 = 20bar | CL 300 = 50bar | CL 400 = 68bar | CL 600 = 100bar | |
| No. of bolt holes | Diameter | Diameter | Diameter | Diameter |
| 4 bolt holes | DN15 - DN40 | DN15 - DN40 | DN15 - DN40 | DN15 - DN40 |
| 8 bolt holes | DN90 - DN200 | DN50 - DN125 | DN50 - DN125 | DN50 - DN125 |
| 12 bolt holes | DN250 - DN300 | DN150 - DN200 | DN150 - DN200 | DN150 - DN200 |
| 16 bolt holes | DN400 - DN450 | DN250 - DN300 | DN250 - DN300 | DN250 |
| 20 bolt holes | DN350 - DN400 | DN350 - DN400 | DN300 - DN450 | |
| 24 bolt holes | DN500 - DN600 | DN450 - DN600 | DN450 - DN600 | DN500 - DN600 |
The type of flange has a Class 600 pressure, equivalent to 100 bar. Similar to Class 400 flanges, this flange type can operate stably in systems with high pressure, especially compressed air systems, hot steam...
Nevertheless, the flange type possesses a Class 900 pressure rating, which corresponds to 150 bar. It is rarely used due to its extremely high pressure compared to conventional systems. Hence, it is only applied in specialized fields such as goods lifting systems, large objects using hydraulic oil or compressed air, used in mining, mineral extraction, oil & gas industries...
| Class 900 = 150bar | Class 1500 = 250bar | Class 2500 = 420bar | |
| No. of bolt holes | Diameter | Diameter | Diameter |
| 8 bolt holes | DN75 - DN125 | DN50 - DN125 | DN50 - DN125 |
| 12 bolt holes | DN150 - DN200 | DN150 - DN200 | DN150 - DN200 |
| 16 bolt holes | DN250 | DN250 | DN250 |
| 20 bolt holes | DN300 - DN600 | DN300 - DN600 | DN300 - DN600 |
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Design of ANSI Flange Standards
ANSI flanges are typically fabricated from sturdy materials capable of withstanding high pressures, such as:
◎ ANSI flanges fabricated from stainless steel.
◎ ANSI flanges fabricated from steel, welded steel, galvanized steel, carbon steel.
◎ ANSI flanges fabricated from plastic.
◎ ANSI flanges fabricated from forged materials.
◎ ANSI flanges fabricated from cast materials.
ANSI flanges are designed in various types, each with distinct features to perform different functions. Some typical types of flanges include:
◎ Slip On Flange: Fully welded on both the outer and inner surfaces, larger in size than the pipe for easy sliding and repositioning.
◎ Welding Neck Flange: Connected to the pipe by full welding, used for large-sized pipes and high pressures.
◎ Socket-Weld Flanges: Also using welding joints, suitable for small-sized systems with high pressures.
◎ Threaded Flange: Using threaded connections, suitable for small-sized pipes and low pressures.
◎ Blind Flange: Designed with a closed shape, without internal holes to allow fluid passage through valves, typically used for temporarily sealing pipes for maintenance.
◎ Lap Joint Flange: Not directly in contact with the fluid, manufactured from common alloy steels, not requiring high pressure.
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Applications of ANSI Flange Standards
ANSI flanges are commonly applied in systems with high pressures. ANSI flange products are widely used in many systems, especially large-scale systems with high pressure. Typical applications include compressed air systems, hot steam systems, mineral extraction systems, fuel, mines, product manufacturing systems, pumping systems, chemical industry, water supply and drainage systems, firefighting systems, securely connecting industrial equipment, accessories, valves, pipes into systems.
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Contact H2 Global to receive professional consultation, design, manufacturing, and installation services tailored to your needs!
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