Flat Welding Flange with Neck

Neck slip-on flange is a flange that connects steel pipes, pipe fittings, etc. into the flange and connects to equipment or pipelines through fillet welds.

The characteristics of neck slip-on flange include:

1. Manufacturing process: forging.

2. Applicable nominal pressure: not more than 2.5MPa.

3. Material: carbon steel, chromium-molybdenum steel, 304, etc.

4. Sealing surface form: raised surface, concave and convex surface, tongue and groove surface, full plane, etc.

The application scenarios of neck slip-on flange include pipeline connection in petrochemical equipment, which is suitable for steel pipeline connection with nominal pressure not exceeding 2.5MPa. It has a reasonable structure, high strength and rigidity, can withstand high temperature and high pressure, repeated bending and temperature fluctuations, and has reliable sealing.

The manufacturing process of neck slip-on flange is mainly forging, which has high strength and rigidity and is suitable for high-pressure and high-temperature pipeline systems. Its structural design and material selection enable it to maintain good sealing performance and mechanical strength in harsh working environments.

The material of the necked flat welding flange is machined from ordinary steel plates with thickness that meets the requirements. The weld of this flange is a fillet weld, and the connection method with the pipe is to connect it to the equipment or pipeline through a fillet weld. The structure of the necked flat welding flange is relatively simple, and the material is relatively economical. Although its rigidity and sealing are not as good as the necked butt welding flange, it is widely used in the connection of medium and low pressure containers and pipelines. In addition, the nominal pressure range of the necked flat welding flange is 0.6---4.0MPa, and its larger inner diameter means that the weight is smaller and the cost is lower, which is particularly suitable for occasions with a nominal diameter greater than 250mm. Compared with the necked butt welding flange, the necked flat welding flange (SO) does not require testing, which further reduces the cost.

The specifications of the slip-on neck flange include raised face (RF), concave face (FM), convex face (M), tenon face (T), groove face (G), and full face (FF). The diameter range of these models is DN10~DN600, suitable for different pressure levels and materials. Specifically, the slip-on neck flange is suitable for PN series (PN2.5~PN40) and Class series (Class150~Class1500), and can be made of a variety of materials, such as carbon steel, chrome-molybdenum steel, stainless steel (304, 316, 304L, 316L, 321, 347, CF8C), etc. In addition, the specifications of the slip-on neck flange also include the standards of HG/T20592-20635-1997 and HG/T20592-20635-2009 steel pipe flanges, gaskets, and fasteners, as well as the specific product information of HG20594 flange slip-on neck flange class150 flange, showing its application potential in different industries and fields.

The application scenarios of the necked flat welding flange mainly include the connection between medium and low pressure containers and pipelines, gas valves and natural gas pipelines, and flammable, explosive, corrosive and toxic places.

Necked flat welding flanges are simple in structure and save materials. Although their rigidity and sealing are not as good as necked butt welding flanges, they are still widely used in the connection of medium and low pressure containers and pipelines. The sealing surface of this flange can be convex, concave and convex, and tongue and groove. They differ in structure, sealing effect and strength, and are suitable for general media. Necked flat welding flanges are particularly suitable for flammable, explosive, corrosive and toxic places, because their short neck can improve the rigidity and bearing capacity of the flange. In addition, necked flat welding flanges are also used for gas valves and natural gas pipelines, ensuring the safety and reliability of use.

The technical parameters of the necked flat welding flange include the sealing surface form, diameter range, applicable pressure level, material, and standard.

(1) Sealing surface form: The sealing surface of the necked flat welding flange is diverse, including raised face (RF), concave face (FM), convex face (M), tenon face (T), groove face (G), full plane (FF), etc.

(2) Diameter range: The diameter range of the necked flat welding flange is wide, from DN10 to DN600.

(3) Applicable pressure level: Applicable to PN series (nominal pressure) PN2.5~PN40; Class series Class150~Class1500. The pressure levels cover 0.6Mpa~32Mpa, 150Lb~2500Lb, PN0.25~PN42.0, and can be customized according to needs. ‌

(4) Material: Neck slip-on flanges are made of a variety of materials, including carbon steel, chrome-molybdenum steel, stainless steel (304, 316, 304L, 316L, 321, 347, CF8C, etc.), and special materials such as 310S, 2205, 904L, etc. ‌

(5) Standard: Neck slip-on flanges comply with a variety of standards, including national standards, American standards, German standards, Japanese standards, British standards, etc., and can be customized according to needs.

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(6) In addition, neck slip-on flanges have a wide range of sizes, from DN10MM to DN1828MM.