Stainless Steel Threaded Pipe Flange BS4504 PN 25 4 Inch Threaded Flange Raised

Product Specification

Stainless Steel Threaded Pipe Flange BS4504 PN 25 4 Inch Threaded Flange Raised Face 304/314/316 in Water/Power/Oil Industry Pipelines

Introduction of BS4504 Threaded Flanges:

Threaded flanges, also known as screw flanges, companion flanges, or NPT flanges, feature a central female National Pipe Thread (NPT) which simplifies connections to male NPT threaded pipes. This design is widely utilized across diverse industries due to its compatibility with standard thread forms for linking pipes and fittings. Threaded flanges are particularly useful for creating reducing connections, enabling larger pipes or fittings with larger NPT threads to be attached to smaller counterparts with smaller NPT threads.

In various sectors such as plumbing, oil and gas, chemical processing, and general industrial piping systems, threaded flanges with NPT threads find extensive application. They are chosen when a threaded connection is preferred or required, facilitating straightforward installation, maintenance, and modification of piping systems.

Threaded flanges are designed with internal threads that allow them to connect to threaded pipes without the need for welding, offering convenience in installation and maintenance where welding is impractical or impossible.

In situations where alloy steel flanges are sufficiently strong but welding presents challenges or poor performance, threaded flanges provide a viable alternative. However, it's crucial to note their limitations. They are not suitable for applications involving sharp temperature changes or extremes outside the range of -45°C to 260°C, as these conditions can potentially cause leakage.

Threaded flanges resemble Slip-On flanges in appearance but are specifically bored to match the inner diameter of the pipe. The backside of the center opening is threaded with tapered pipe threads of the appropriate size.

The primary advantage of threaded flanges lies in their elimination of welding requirements, thereby minimizing additional stresses on the pipe or vessel during flange installation. However, threaded flanges tend to be thicker and more costly compared to other types. They excel in applications requiring high-pressure connections.

BS4504 Threaded Flanges Dimensions:

1.Dimensions are in millimeters(mm).

2.Dimensions can be specified by different purchasers.

Grades of Stainless Steel Threaded Flanges:

Stainless Steel Threaded Flanges specified by ASTM A182 are widely used in various industries. These flanges are designed to slip over the pipe and are welded both inside and outside to provide a secure and leak-proof connection. The material grades F304, F304L, F316, F316L, and F304H denote specific types of stainless steel, each with unique properties suited for different applications.

ASTM A182 F304:

Composition: Austenitic stainless steel with a nominal composition of 18% chromium and 8% nickel.

Properties: Good corrosion resistance, weldability, and formability. Suitable for general-purpose applications.

ASTM A182 F304L:

Composition: Similar to F304 but with a lower carbon content (max 0.03%).

Properties: Enhanced resistance to intergranular corrosion after welding. Ideal for applications requiring post-weld heat treatment.

ASTM A182 F316:

Composition: Contains 16% chromium, 10% nickel, and 2% molybdenum.

Properties: Superior corrosion resistance, especially against chlorides and other industrial solvents. Suitable for more aggressive environments.

ASTM A182 F316L:

Composition: Similar to F316 but with lower carbon content (max 0.03%).

Properties: Improved resistance to intergranular corrosion. Preferred for welding operations where post-weld annealing is not possible.

ASTM A182 F304H:

Composition: Similar to F304 but with a higher carbon content (0.04%-0.10%).

Properties: Improved high-temperature strength and creep resistance. Suitable for high-temperature applications.

The Differences between Carbon Steel and Stainless Steel Threaded Flanges:

Material Composition:

Carbon Steel Threaded Flanges: These are made from carbon steel, which is primarily composed of iron and carbon. Carbon steel is known for its strength and durability, making it suitable for various industrial applications.

Stainless Steel Threaded Flanges: These are made from stainless steel, which includes iron mixed with chromium and other alloying elements like nickel and molybdenum. Stainless steel offers excellent corrosion resistance and can withstand high temperatures, making it ideal for environments where corrosion is a concern.

Corrosion Resistance:

Carbon Steel Threaded Flanges: Carbon steel is susceptible to corrosion and rusting, especially in environments with moisture or corrosive substances. It requires proper coating or maintenance to prevent corrosion.

Stainless Steel Threaded Flanges: Stainless steel has inherent corrosion resistance due to its chromium content, which forms a passive oxide layer that protects the metal from rust and corrosion. It is ideal for applications where corrosion resistance is critical.

Strength and Durability:

Carbon Steel Threaded Flanges: Carbon steel is known for its strength and durability, making it suitable for high-pressure and heavy-duty applications.

Stainless Steel Threaded Flanges: Stainless steel is also strong and durable, often used in applications where corrosion resistance and mechanical properties are equally important.

Cost:

Carbon Steel Threaded Flanges: Generally, carbon steel threaded flanges are more cost-effective compared to stainless steel flanges.

Stainless Steel Threaded Flanges: Stainless steel flanges are typically more expensive due to the higher cost of materials and manufacturing processes involved in producing stainless steel.

Applications:

Carbon Steel Threaded Flanges: These are commonly used in applications where strength and cost-effectiveness are prioritized over corrosion resistance, such as in oil and gas pipelines, water treatment plants, and industrial processes.

Stainless Steel Threaded Flanges: These are preferred in industries where corrosion resistance is critical, such as chemical processing, food processing, pharmaceuticals, marine environments, and high-end architectural applications.

Applications of BS4504 Threaded Flanges:

BS4504 threaded flanges, which conform to British Standards, find various applications across industries where a threaded connection is preferred or required. Here are some common applications of BS4504 threaded flanges:

General Industrial Piping: BS4504 threaded flanges are used in general industrial piping systems where ease of installation and maintenance are essential. They provide a reliable threaded connection that simplifies assembly and disassembly, facilitating quick adjustments or repairs.

Chemical Processing: In chemical plants and refineries, BS4504 threaded flanges are utilized for connecting pipes and equipment where chemical compatibility and resistance to corrosion are critical. The threaded connection allows for secure sealing without the need for welding, reducing the risk of chemical contamination.

Water Treatment: Threaded flanges are commonly employed in water treatment facilities, including municipal water supply systems and wastewater treatment plants. BS4504 threaded flanges are used to connect pipes carrying water and various treatment chemicals, offering a robust and leak-free connection.

Oil and Gas Industry: Threaded flanges are used in oil and gas pipelines and facilities where ease of installation and maintenance are advantageous. BS4504 threaded flanges can withstand moderate to high pressures and are suitable for applications where welding may not be feasible or desirable.

Food and Beverage Industry: Stainless steel BS4504 threaded flanges are preferred in the food processing and beverage industry due to their corrosion resistance and hygienic properties. They are used to connect piping systems transporting food products and beverages where cleanliness and sanitation are crucial.