British Standard Flanges

What are British Standard Flanges?

British Standard Flanges (BS Flanges) are flanges that conform to the dimensional and pressure-rating standards set by the British Standards Institution (BSI). These flanges are commonly used in the UK, Europe, and other countries that have adopted British standards for pipe fittings.

Standard Specication For British Standard Flanges

• Dimensions: ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
• Size : 1/2″ (15 NB) to 48″ (1200NB)
• Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
• DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629,
• DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673
• BS : BS4504 , BS4504, BS1560, BS10
• Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Advantages and disadvantage of British Standard Flanges

Some of the benefits of British Standard flanges include compatibility with other flanges and fittings that meet BS standards and the ability to handle high pressure and high temperature applications. They are also known for their durability and reliability, and are widely available in a variety of sizes and materials. A disadvantage of British Standard flanges is that they may not be compatible with pipe flanges and fittings from other countries that use different size and pressure class standards. This can make it difficult to connect British Standard flanges to piping or other components manufactured outside of the UK. In addition, some users may find that the variety of sizes and materials available may make it difficult to select the right flange for a particular application.

What are the different types of British Standard Flanges?

There are several different types of BS Flanges, including Weld Neck Flanges, Slip-On Flanges, Blind Flanges, Threaded Flanges, and Socket Weld Flanges. Each type of flange is designed for a specific application and has unique characteristics that make it suitable for different types of piping systems.

• Weld Neck Flanges are designed for high-pressure applications and are used to connect pipes or other piping components. They have a long, tapered neck that is welded to the pipe or fitting, providing added strength and stability.
• Slip-On Flanges are similar to Weld Neck Flanges, but they do not have a tapered neck. Instead, they have a short, flat collar that is welded to the pipe or fitting. These flanges are suitable for low- to medium-pressure applications.
• Blind Flanges are used to close off the end of a pipe or fitting. They have a solid, circular body with no bore or opening, and are often used in applications where the flow of fluid must be stopped or redirected.
• Threaded Flanges are designed for use with pipes or fittings that have threads. They have a threaded bore that allows them to be attached to the pipe or fitting using a threaded connection.
• Socket Weld Flanges are similar to Threaded Flanges, but they have a socket-shaped bore that allows them to be attached to the pipe or fitting using a socket-weld connection. These flanges are suitable for high-pressure applications.

Material of British Standard Flanges

British Standard flanges are usually made of forged carbon steel or stainless steel. These materials are chosen for their strength and durability, as well as their corrosion resistance. Depending on the specific application, other materials, such as alloy steel, may also be used. It is important to select the right material for a specific application to ensure that the flange can withstand the required pressure and temperature conditions.

Size of BS Flanges

There are different types of BS flanges, each with its own size range.The size of the BS flange depends on the size of the pipe or fitting used. For example, a BS4504 flange used with 1″ pipe has a diameter of approximately 1.5″. To determine the exact size of a BS flange, you need to know the type of flange and the size of the pipe or fitting with which it is to be used. The size of a BS flange is usually specified by its nominal size, which is the diameter of the pipe designed to be used with the flange. the nominal size of a BS flange is usually expressed in inches, but can also be expressed in millimeters.

Dimensions of British Standard Flanges

The dimensions of these flanges are usually specified based on BS flange diameter, bolt circle diameter, bolt hole size and flange thickness. The specific dimensions of a particular British Standard flange depend on the size and pressure rating of the flange.

Dimensions of BS 4504 Flange

BS4504 flanges, are flanges that conform to the British Standard BS4504: Section 3.1: 1989, which outlines the specifications for circular flanges for pipes, valves, and fittings. The dimensions of British Standard Flanges are determined by the size of the pipe or fitting to which the flange will be attached, as well as the pressure rating of the flange.

BS 4504 PN2.5 Flange Dimensions

BS 4504 PN25 Flange Dimenisons

Dimensions of BS 10 Flange

The dimensions of BS 10 flanges are specified in the British Standard BS 10: 1962, which includes tables of flange dimensions for various pressure ratings, sizes, and bolt circle diameters.

BS 10 Table D Flange Dimensions

BS 10 Table D flanges: These are flat-faced flanges that are typically used with pipes that have a small diameter, such as those used in low-pressure piping systems.

BS 10 Table H Flange Dimenisons

BS 10 Table H flanges: These are flanges with a raised face and a hub, which helps to distribute the load evenly across the flange and the pipe. They are typically used in very high-pressure piping systems.

BS 10 Table J Flange Dimenisons

BS 10 Table J flanges: These are flanges with a male face and a female hub, which allows them to be joined together easily without the need for bolts or other fasteners. They are typically used in low-pressure piping systems.

BS 10 Pipe Flanges Weight Chart

Stainless Steel BS 10 Flanges Pressure Ratings

Dimensions of BS 3293 Weld Neck & Slip-On Flanges

BS 3293:1960 is a dimensional British Standard only, applicable to forged carbon steel slip-on flanges and welded neck flanges of 26″ nominal size and above in the petroleum industry. Drilled, bolted, finished and thickness dimensions also apply to integral end flanges for valves and fittings. Four classes of flanges are provided, namely Classes 150, 300, 400 and 600. BS 3293:1960 does not include pressure/temperature ratings; flange names quoted are for identification purposes only.

Dimensions of BS 3293 Class 150 Weld Neck & Slip-On Flanges

General note..

• All dimensions above are in millimeters unless otherwise indicated.

Indications..

• NPS = Nominal Pipe Size
• O = Outside Diameter of Flange
• B1 = Flange Bore Slip-On
• C = Thickness of Flange Min
• Y2 = Weld Neck Overall Length
• Y1 = Slip-On Overall Length
• A = Weld Neck Diameter at Weld Bevel
• X = Weld Neck / Slip-On Hub Diameter
• R = Raised Face (O.D.) Outside Diameter
• NBH = Number of Bolt Holes
• DBH = Diameter of Bolt Holes
• r = Fillet Radius
• D = Diameter of Bolt Circle
• B2 = To be specified by purchaser
• Rf = Class 150-300 Rf height 1.6mm Class 400-600 Rf height 6.35mm

Weights of Class 150 Weld Neck & Slip-On flanges

Note..

• Weights are based on manufacturer’s data and are approximate

Dimensions of BS 3293 Class 300 Weld Neck & Slip-On Flanges

Indications..

• NPS = Nominal Pipe Size
• O = Outside Diameter of Flange
• B1 = Flange Bore Slip-On
• C = Thickness of Flange Min
• Y2/Y1 = Weld Neck / Slip-On Overall Length
• A = Weld Neck Diameter at Weld Bevel
• X1 = Slip on Hub Diamameter at Small End
• X = Weld Neck / Slip-On Hub Diameter
• R = Raised Face (O.D.) Outside Diameter
• NBH = Number of Bolt Holes
• DBH = Diameter of Bolt Holes
• r = Fillet Radius
• D = Diameter of Bolt Circle
• B2 = To be specified by purchaser
• Rf = Class 150-300 Rf height 1.6mm Class 400-600 Rf height 6.35mm

Weights of Class 300 Weld Neck & Slip-On flanges

Note..

• Weights are based on manufacturer’s data and are approximate

Ring Joint Facings BS 3293

Indications..

• NPS = Nominal Pipe Size
• R = Raised Face (O.D.) Outside Diameter
• K = Pitch Diameter
• L = Groove Depth
• M = Groove Width
• r = Corner radius at bottom of groove 1.6 mm max

Dimensions and Tolerances BS 3293

General note..

• All dimensions above are in millimeters unless otherwise indicated.

Dimensions of BS 3293 Class 400 Weld Neck & Slip-On Flanges

Indications..

• NPS = Nominal Pipe Size
• O = Outside Diameter of Flange
• B1 = Flange Bore Slip-On
• C = Thickness of Flange Min
• Y2/Y1 = Weld Neck / Slip-On Overall Length
• A = Weld Neck Diameter at Weld Bevel
• X1 = Slip on Hub Diamameter at Small End
• X = Weld Neck / Slip-On Hub Diameter
• R = Raised Face (O.D.) Outside Diameter
• NBH = Number of Bolt Holes
• DBH = Diameter of Bolt Holes
• r = Fillet Radius
• D = Diameter of Bolt Circle
• B2 = To be specified by purchaser
• Rf = Class 150-300 Rf height 1.6mm Class 400-600 Rf height 6.35mm

Weights of Class 400 Weld Neck & Slip-On flanges

Note..

• Weights are based on manufacturer’s data and are approximate

Ring Joint Facings BS 3293

Indications..

• NPS = Nominal Pipe Size
• R = Raised Face (O.D.) Outside Diameter
• K = Pitch Diameter
• L = Groove Depth
• M = Groove Width
• r = Corner radius at bottom of groove 1.6 mm max

Dimensions and Tolerances BS 3293

General note..

• All dimensions above are in millimeters unless otherwise indicated.

Dimensions of BS 3293 Class 600 Weld Neck & Slip-On Flanges

Indications..

• NPS = Nominal Pipe Size
• O = Outside Diameter of Flange
• B1 = Flange Bore Slip-On
• C = Thickness of Flange Min
• Y2/Y1 = Weld Neck / Slip-On Overall Length
• A = Weld Neck Diameter at Weld Bevel
• X1 = Slip on Hub Diamameter at Small End
• X = Weld Neck / Slip-On Hub Diameter
• R = Raised Face (O.D.) Outside Diameter
• NBH = Number of Bolt Holes
• DBH = Diameter of Bolt Holes
• r = Fillet Radius
• D = Diameter of Bolt Circle
• B2 = To be specified by purchaser
• Rf = Class 150-300 Rf height 1.6mm Class 400-600 Rf height 6.35mm

Weights of Class 600 Weld Neck & Slip-On flanges

Note..

• Weights are based on manufacturer’s data and are approximate

Ring Joint Facings BS 3293

Indications..

• NPS = Nominal Pipe Size
• R = Raised Face (O.D.) Outside Diameter
• K = Pitch Diameter
• L = Groove Depth
• M = Groove Width
• r = Corner radius at bottom of groove 1.6 mm max

Dimensions and Tolerances BS 3293

General note..

• All dimensions above are in millimeters unless otherwise indicated.

Manufacturing process of BS Flanges

BS flanges can be produced by forging, casting, cutting or rolling. We mainly produce flanges by forging, cutting and rolling processes.

Manufacturing process of BS forged flange

The forging process usually includes the following processes, i.e. selection of high quality billets, heating, forming and cooling.

• Raw material inspection – The key raw material used to produce flanges is billet or hot rolled bar stock. All raw materials purchased are supplied with test reports in accordance with British Standards with full traceability. This is the first mandatory step in the flange production process to ensure good quality. The raw materials are retested in-house to ensure chemical composition, mechanical properties and metallographic analysis.
• Cutting of raw materials – Correct and strict control of cutting sizes and proportions ensures full cost control.
• Heating – This is a very important step for the quality of the flanges. It is necessary to keep detailed records of heating temperatures to avoid overheating. Overheating can damage the structure of the metal and the mechanical properties of the raw material.
• Forging – The forging process is divided into free forging and die forging. The forging time and strength of flanges vary for different pressure classes.
• Heat treatment-The purpose of heat treatment is to eliminate the stress inside the flange and make the density more uniform. Careful recording of heat treatment temperature and cooling time is the key.
• Inspection of forging blanks – After the heat treatment process, select batch samples are tested again for chemical composition and mechanical properties to ensure that all items pass.
• Machining of forging blanks – During machining, inspection is performed along with machining to ensure that each part of the flange is qualified. Machining is performed on CNC and/or lathes.
• Finished Product Inspection – The finished product will be inspected 100% prior to delivery to ensure that the goods meet ASME, EN or customer standards.
• Documented Documentation – The entire production process and quality checks at different levels are documented according to ISO compliant standard operating procedures. This is the guarantee of good quality.
• Test certificates: As we are an ISO and PED certified manufacturer, we can issue test certificates for all goods upon delivery and inspection in accordance with British Standards.
• Packaging: All forgings and flanges are packed in wooden boxes or crates or pallets to ensure safe movement of the goods.

Production process of BS casting flange

The production process of a BS casting flange typically involves several steps, including the creation of a mold or pattern, the casting of the flange using molten metal, and various finishing and quality control steps. To begin the process, a mold or pattern is created using a material such as wood or metal. This mold or pattern will be used to create the shape of the flange, and will typically be made to precise specifications to ensure that the final product meets the desired dimensions and specifications. Once the mold or pattern is ready, the casting process can begin. This typically involves melting the metal that will be used to create the flange, such as iron or steel, and pouring the molten metal into the mold or pattern. The metal is then allowed to cool and solidify, taking on the shape of the mold or pattern. After the casting process is complete, the flange will typically undergo various finishing and quality control steps. This may include machining or grinding to achieve the desired dimensions and surface finish, as well as testing to ensure that the flange meets the required specifications and standards. Overall, the production process for a BS casting flange is a highly precise and technical process that requires a thorough understanding of metallurgy, casting techniques, and quality control processes.

Manufacturing process of BS plate cutting flange

The process here is relatively simple, and the key raw material is hot rolled plate. The process is mainly used to produce lower thickness sliding plate flanges and blind flanges. All plates purchased are accompanied by a test certificate to British Standards. The circles are cut from the plates. No heat treatment is involved in the flange manufacturing process. Drilling and machining is carried out on the circles to obtain the required dimensions. The goods are visually inspected and marked in accordance with the relevant standards.

Marking of BS Flanges

BS flanges are usually marked with a code indicating the flange size and pressure rating. The code is usually printed on the flange or on a label printed on the flange. The code may also include other information such as the type of flange (e.g., weld neck, slip-on, etc.), the material used to make the flange, and the name or logo of the manufacturer. The exact format of the code may vary depending on the standard organization that created it, but it is usually a combination of letters and numbers. For example, a BS flange with a size of 10 inches and a pressure rating of 150 pounds per square inch (PSI) might be marked as “BS10 150#” or something similar.

Packing of BS Flanges

In terms of packing, it is important to properly pack the BS flanges to protect them during shipping and handling. This can typically be done using protective materials such as bubble wrap, foam sheets, or packaging peanuts to cushion the flanges and prevent them from being damaged. It is also important to properly label the package to indicate the contents and to ensure that it is handled with care during transport.

Inspection and measurement of BS Flanges

The inspection and measurement of these flanges is usually carried out in accordance with the relevant BS standards. This usually involves measuring the dimensions of the flange, such as the diameter and thickness of the flange and the size and shape of the bolt holes. In addition, the surface finish and overall condition of the flange should be checked for any defects or irregularities. BS flanges are typically inspected and measured using a variety of tools and methods to ensure they meet the necessary codes and standards. This can include measuring the dimensions of the flange using calipers and micrometers, as well as using visual inspection techniques to check for any defects or inconsistencies in the material. Other methods, such as x-ray or ultrasonic inspection, can also be used to check for internal defects that cannot be detected by visual inspection alone. The specific inspection and measurement methods used depend on the type and size of the flange and the specific requirements of the application.

Application of BS Flanges

British standard flanges are known to deliver exceptional performance and are generally developed for meeting the demands. We oer a broad range of BS Flanges through a worldwide network of stock-keeping branches. These british standard flange is use in various industries like:

• Stainless Steel British Standard Flange uses in Oil and Gas Pipeline;
• British Standard Flange uses in Chemical Industry;
• Alloy Steel British Standard Flange uses in Plumbing;
• British Standard Flange uses in Heating;
• British Standard Pipe Flange uses in Water Supply Systems;
• British Standard Flange uses in Power Plant;
• British Standard Flanges uses in Paper & Pulp Industry;
• British Standard Flange uses in General Purpose Applications;
• British Standard Flange uses in Fabrication Industry;
• British Standard Flange uses in Food Processing Industry;
• British Standard Flange uses in Structural Pipe.

How to purchase the correct BS flanges?

To purchase the correct BS flange, you need to know the following information about BS flanges.
The type of BS flange you need: There are several types of BS flanges, including sliding flanges, butt-weld flanges, socket-weld flanges, threaded flanges and blind flanges. Make sure you select the correct type for your application.
Material of BS flanges: BS flanges are usually made of carbon steel, stainless steel or alloy steel. Select a material suitable for the fluid or gas flowing through the flange and for the operating temperature and pressure.
Special requirements for BS flanges: Any special requirements that the flange needs to meet, such as corrosion resistance or high temperature resistance.
Size of BS flanges: BS flanges are available in a variety of sizes, measured according to the diameter of the pipe or fitting to which the flange is connected. Make sure you select the correct size for your application.
Pressure rating of BS flanges: BS flanges are available in different maximum pressure ratings. Select the flange with the right pressure rating for your application.
Connection type of BS flanges: The connection type of BS flanges depends on the specific type of flange and the requirements of the piping system. Some common types of BS flanges include slip-on flanges, butt-weld flanges and threaded flanges. These flanges are typically connected to piping and other equipment using bolts, the number and size of which depend on the size and pressure rating of the flange. In general, BS flanges are designed to provide a strong and reliable connection that can withstand the pressure and temperature conditions of the piping system.
Welding and machining requirements: If BS flanges are to be welded to pipe or fittings, ensure that you select a flange that is compatible with the welding equipment and has the correct machining tolerances. BS flange manufacturer: It is important to choose a reputable and reliable manufacturer to ensure that the BS flange is of high quality and meets the proper standards.
Once you have this information, you can contact the supplier or manufacturer of the BS flange to order. You may also need to provide technical drawings or specifications to ensure that you receive the correct flange.

How to select BS flanges manufacturer?

Choosing a BS flange manufacturer can be a challenging task as there are many factors to consider and it is important to choose a reliable and reputable company. Here are some tips to help you in your search. Start by researching the different manufacturers available in the market. Look for companies that have experience and expertise in manufacturing BS flanges. You can seek advice from other industry professionals or search online for companies that specialize in this type of product. Consider the manufacturer’s reputation. Look for companies that have a proven track record and a reputation for producing quality products. You can check customer reviews and ratings to get an idea of a company’s reputation. Look for a manufacturer that offers BS flanges in a variety of sizes, materials and grades. This will ensure that you can find the right flange for your specific application and needs. Consider the cost of the flange. While cost is an important factor, it should not be the only consideration when choosing a manufacturer. Be sure to compare prices from different companies to get an idea of market prices. Check the delivery time and availability of the flange. Choose a manufacturer that can deliver flanges on time and has a proven track record of meeting delivery deadlines. Consider the customer service offered by the manufacturer. A good manufacturer will have a team of knowledgeable and experienced employees who can help you with any questions or concerns you may have about the flange. Look for a manufacturer that offers after-sales support and technical assistance. This will ensure that you can get the support you need if any problems arise with the flange after it is installed. Ensure that the manufacturer complies with all industry standards and regulations. Choose a company that is certified by the relevant authorities and has a proven track record of compliance with industry standards. In short, choosing the right BS flange manufacturer requires careful consideration and research. By taking the time to evaluate different companies and considering the above factors, you can find a manufacturer that meets your needs and provides a quality flange for your specific application.

Export Country For BS Flanges