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Description:
Square flanges are made in accordance with JIS B2291 / JIS F7806 standards. Square flanges are used for between pipe-to-pipe or pipe-to-components connections. They are mostly used in hydraulic systems line where there is a passage of fluids and are made of two materials which is steel and stainless steel.
There are 3 type of designs for square flanges: SHAB Square Flanges, SSAB Square Flanges, and KAB Square Flanges. The pressure ratings for square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm². It is with a single available socket weld connection that requires the pipe to have plain connection ends.
Square flanges are made in accordance with JIS B2291 / JIS F7806 standards. Square flanges are used for between pipe-to-pipe or pipe-to-components connections. They are mostly used in hydraulic systems line where there is a passage of fluids and are made of two materials which is steel and stainless steel.
There are 3 type of designs for square flanges: SHAB Square Flanges, SSAB Square Flanges, and KAB Square Flanges. The pressure ratings for square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm². It is with a single available socket weld connection that requires the pipe to have plain connection ends.
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Product Information of Square Flanges
1. Specifications:
Square flange is a square shape flange that used in between pipe to pipe or pipe to components connections, like valves, tees, and elbows. Square flanges are made in accordance to JIS B2291 / JIS F7806 standard. It links the JIS standard nominal bore size pipes together in a hydraulic system. By using square flanges, you can assure a continuous flow of liquids across stainless steel pipes or other hydraulic systems. Square flanges are mostly used in hydraulic oil systems or steam lines.
Among the many international standards, the JIS B2291 and JIS F7806 standards hold particular significance when it comes to square flanges. These standards enhance safety, reliability, and compatibility while reducing maintenance costs and ensuring compliance with international regulations.
Square flange is a square shape flange that used in between pipe to pipe or pipe to components connections, like valves, tees, and elbows. Square flanges are made in accordance to JIS B2291 / JIS F7806 standard. It links the JIS standard nominal bore size pipes together in a hydraulic system. By using square flanges, you can assure a continuous flow of liquids across stainless steel pipes or other hydraulic systems. Square flanges are mostly used in hydraulic oil systems or steam lines.
Among the many international standards, the JIS B2291 and JIS F7806 standards hold particular significance when it comes to square flanges. These standards enhance safety, reliability, and compatibility while reducing maintenance costs and ensuring compliance with international regulations.
- JIS B2291 standards are a set of specifications established by the Japanese Industrial Standards (JIS) for hydraulic fluid power - flange connections. These standards govern the design, dimensions, and performance of square flanges used in hydraulic systems. Their global recognition stems from the precision and compatibility they ensure in hydraulic applications.
- JIS F7806 standards are specific to marine flanges, particularly in the context of shipbuilding and maritime applications. These standards, defined by the Japanese Industrial Standards Committee, outline the requirements for square flanges used in the marine industry. Their primary role is to ensure safety and reliability in the challenging and corrosive marine environment.
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2. Material:
The materials used to fabricate square flanges are steel (SF440A) and stainless steel (SS316). In many industries, stainless steel (SS316) is a preferred choice due to its strong resistance to corrosion. Stainless steel has the capability of withstanding high pressures and temperatures, as well as lasting longer. Thus, SS316 solves the corrosion problem which is caused by environmental changes, chemical interaction, and other factors. Steel (SF440A) is also known as carbon steel, and it is one of the most fundamental steel types utilised in manufacturing industries. Carbon steel flanges have enhanced hardness and strength, which manifests themselves throughout manufacturing. Carbon steel flanges also have excellent corrosion resistance, heat resistance, and durability. |
SHAB and SSAB Square Flanges
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Chemical Composition of SF440A Flanges:
Grade |
P (%) |
Fe (%) |
C (%) |
S (%) |
Si (%) |
SF440A: Minimum |
- |
99.25 |
- |
- |
- |
SF440A: Maximum |
0.040 |
100 |
0.26 |
0.050 |
0.4 |
Mechanical Composition of Carbon Steel:
Grade |
Yield Strength Minimum (MPa) |
Elongation Minimum % |
Tensile Strength (MPa) |
SF440A |
Thickness ≥ 16mm: 235 Thickness ˂ 16mm: 245 |
Thickness ˂ 5mm: 21 Thickness ˂ 5 -16mm: 17 Thickness ≥16mm: 21 |
400 - 510 |
Thermal Expansion of the Carbon Steel:
Properties |
Imperial |
Metric |
Thermal Expansion Coefficient (@0-100⁰C/32-212⁰F) |
- |
11 m/mK |
Thermal Conductivity |
20 BTU in/hr.ft.⁰F |
50W/mK |
3. Size Range & Pressure Rating:
The sizes of square flanges range from 1/4" to 6" in nominal bore sizes. Pressure rating of square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm².
The sizes of square flanges range from 1/4" to 6" in nominal bore sizes. Pressure rating of square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm².
Oring and Flat Square Blind Flanges
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4. Connections Type & Configurations:
The only available connection for square flanges is socket weld where the connection sides of pipes need to be plain ended. There are various types of configurations for square flange: SHAB, SSAB, KAB, LSA, and Blind Flange. SHAB series is a complete set of 210 kg/cm² square flange that combined by hexagon hex bolts with nuts, while SSAB series is a complete set of 210 kg/cm² square flange combined by a socket cap screw. For KAB series, it is a complete set of 280 kg/cm² or 350 kg/cm² square flange combined by hexagon hex bolts with nuts. The flange body of SHAB is larger than SSAB. Complete set of square flange includes male flange (flat side), female flange (o ring side), o ring, and bolts. The female flange is identified as A and male flange is identified as B. Thus, the complete set is AB. LSA is a special type Oring side square flange where the internal flow is in L shaped. Blind flanges are used to seal the flow at the end of a piping system. They are typically used to run a pressure testing of fluids through vessels or pipes. For the termination of hydraulic system, only one side of blind flange is used, either Oring side or flat side. |
5. Versatility of Square Flanges:
- Plumbing and HVAC Systems
In plumbing and HVAC (Heating, Ventilation, and Air Conditioning) systems, square flanges are used to connect pipes, valves, and other components. They ensure leak-proof connections, preventing water or gas leaks that could lead to damage and safety hazards. - Oil and Gas Industry
In the oil and gas industry, square flanges are essential for connecting pipelines, valves, and pumps. The robust design of square flanges helps maintain the integrity of the system, even under high-pressure conditions. - Chemical Processing
Chemical processing plants rely on square flanges to connect various pieces of equipment and transport corrosive fluids. These flanges are often made from materials that resist chemical corrosion. - Construction and Structural Engineering
Square flanges find applications in construction and structural engineering projects. They are used in frameworks and supports, providing stability and strength to structures. - Automotive and Aerospace
In the automotive and aerospace industries, square flanges are employed in various components, including engines and exhaust systems. They help maintain the structural integrity of these critical systems.
6. Application:
Square flanges are essential in sectors which apply high-pressure equipment. They are utilized for pipe-to-pipe connections as well as pipe-to-other-component connections. It is commonly used as a tool for pipe fittings. Square flanges are not suggested for big diameter pipes or high torque situations. Instead, small diameter pipes can be utilized in conjunction with square flanges. Square flanges can be used to connect hydraulic systems in the following sectors to ensure continuous flow of liquids:
Square flanges are essential in sectors which apply high-pressure equipment. They are utilized for pipe-to-pipe connections as well as pipe-to-other-component connections. It is commonly used as a tool for pipe fittings. Square flanges are not suggested for big diameter pipes or high torque situations. Instead, small diameter pipes can be utilized in conjunction with square flanges. Square flanges can be used to connect hydraulic systems in the following sectors to ensure continuous flow of liquids:
- Water channels
- Plumbing activities
- Petrochemical Industries
- Oil and gas industry for pipe connections
7. JIS B2291 & JIS F7806 Standard Benefits:
- Quality Assurance: Adhering to JIS standards guarantees a certain level of quality and performance. This can lead to fewer defects, improved reliability, and enhanced safety in products and systems.
- Global Recognition: While JIS standards are Japanese in origin, they are recognized and used internationally. Complying with these standards can facilitate trade and collaboration with companies and industries around the world.
- Reduced Risk: Following established standards can mitigate risks associated with product failure, safety hazards, and legal liabilities. It provides a framework for design, production, and testing, reducing uncertainty.
- Long-Term Cost Savings: While initial compliance with standards may require an investment, it can lead to long-term cost savings through reduced maintenance, fewer product recalls, and improved overall product lifespan.
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8. How to assemble Square Flanges:
Square Flanges are used for high pressure hydraulic applications up to 350kgf/cm². In order to use and assemble square flanges safely, it is important to know the right procedures and torque range for assembly. Square Flanges made in accordance with JIS B2291 / JIS F7806 standard are connecting pieces that link Japanese Industrial Standards nominal bore size pipes together and have a working pressure of up to 350kgf/cm². The pipes used should be of hydraulic seamless design and suitable for high pressure applications. It is important to note that every hydraulic system requires some form of fitting installation. Hence, proper fabrication and installation are essential for leak free performance, the overall efficiency, and general appearance of any system. In order to use and assemble Square Flanges safely, it is essential to know the right procedures. Do watch our youtube video and our instructions below carefully! |
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Below are the instructions for assembly of Square Flanges.
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STEP 1
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STEP 2
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STEP 3
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STEP 4
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9. Impa Code for Square Flanges:
Square Flanges can be found in the IMPA Marine Stores Guide, which is the world’s leading reference guide for maritime purchasing and supply.
For details on the reference codes of square flanges, please kindly see below:
Square Flanges can be found in the IMPA Marine Stores Guide, which is the world’s leading reference guide for maritime purchasing and supply.
For details on the reference codes of square flanges, please kindly see below:
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FAQ Of Square Flanges
What is the size range of square flanges?
Square flanges come into different sizes range from 1/4 inches to 6 inches.
What is the working pressure scale for square flanges?
There are three different pressure scale which are 210kg/cm², 280kg/cm² and 350kg/cm².
What are the differences among SHAB, SSAB, and KAB?
SHAB operates at a maximum pressure of 210 kg/cm² and is utilised in conjunction with hexagon bolts.
SSAB also operates under 210 kg/cm² pressure. However, the body is smaller than SHAB and is used in conjunction with Allan cap screws.
KAB has a similar design to SHAB, but the key difference is that it has a higher pressure rating of either 280 kg/cm² or 350 kg/cm².
SSAB also operates under 210 kg/cm² pressure. However, the body is smaller than SHAB and is used in conjunction with Allan cap screws.
KAB has a similar design to SHAB, but the key difference is that it has a higher pressure rating of either 280 kg/cm² or 350 kg/cm².
Which fields/ industries would apply square flanges?
Industries that square flanges apply:
- Oil and gas that connects a pipeline
- Petrochemical industrial plants
- Water systems
- Plumbing systems
- Heat exchangers
- Oil and gas that connects a pipeline
- Petrochemical industrial plants
- Water systems
- Plumbing systems
- Heat exchangers
What are the materials used in making square flanges?
Square flanges are two made of two materials which are steel or stainless steel. It is made of SF440A steel or
SS316 stainless steel.
SS316 stainless steel.
Can square flages paired with larger diameter pipes?
It is not suggested for larger diameter pipes with a high weight load operating within them. It is considered to be most effective when dealing with small diameter pipes. However, square flanges are not suitable for use in high torque environments.
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