What are the technical standards and application scope of flanges?

- Mar 13, 2019-

Flange type:

(1) flange with different diameters

Product Name: flange reducer

Technical parameters: in accordance with national standards

Quality standards: Production in strict accordance with relevant standards formulated by the state.

Product specification: DN15-DN2000

Packing: wooden case or others

Product color: metallic color

Product features: anti corrosion, acid and alkali, long service life, reasonable price, smooth surface, acid and alkali resistance, high temperature, beautiful appearance, strong sense of performance.

      Production technology: professional integral forging, forging and manufacturing, medium plate cutting, medium plate rolling, etc.

      Processing methods: high precision CNC lathe turning, ordinary lathe precision car, argon arc welding and other processing.

Nominal pressure sch5s, sch10s, sch20s, sch30s, sch40s, etc.

     Manufacturing standard: national standard, American Standard, Russian standard, Japanese standard, etc.

Material: 201304.316.316L.0Cr18Ni9.321.202, etc.

     Application: widely used in water conservancy, electric power, power station, pipe fittings, industry, pressure vessel, etc.

Connection: flange nut, bolt connection.

(2) stainless steel flange

Name: stainless steel flange (Stainless steel flange)

Specifications: 1/2 "- 240" (10-6000)

Pressure level: 0.6Mpa to 32Mpa, 150Lb to 2500Lb, PN0.25-PN42.0

Material: 304, 304L, 321, 316, 316L, 310S and other materials.

Ministry of chemical industry standards: HG5010-52 to HG5028-58, HGJ44-91 to HGJ65-91, HG20592-2009 (PN Series), HG20615-2009 (Calss Series)

      Applications: boilers, pressure vessels, petroleum, chemical industry, shipbuilding, pharmaceutical, metallurgy, machinery, food and other industries.

(3) pressure vessel flange

Product Name: flange for pressure vessel

Specifications: DN300~3000

        Product notes: pressure vessel flange application industry: HVAC power building, water supply pressure vessel fittings, pressure piping fittings.

Product category: flange series

      Application Industry: HVAC power building, water supply pressure vessel fittings, pressure piping fittings.

Applied technical parameters

Nominal sealing pressure PN, MPa (bar) 0.6 1 1.6 1.6 2.5 4 6.4

Concavo convex surface (MFM) DN1300~3000 DN300~3000 DN400~2000 DN300~800

Tenon groove surface (TG) DN1300~3000 DN300~3000 DN300~3000 DN300~800

Full plane (FF) DN300~3000 DN300~3000 DN300~3000 DN300~800

(4) flat welding flange

Flat welding flange includes plate type flat welding flange and neck flat welding flange.

      Flat welding flange is suitable for the connection of steel pipe with nominal pressure not exceeding 2.5MPa. The sealing surface of flat welding flange can be made into three kinds: smooth type, concave convex type and tenon groove type. Smooth flat welding flange has the largest amount of application.

Flat neck flanges with neck (SO)

       The neck flat welding flange has a low neck height, which improves the rigidity and bearing capacity of the flange. Compared with butt welded flanges, the welding consumes a lot and consumes a lot of electrodes. It can not withstand high temperature, high pressure and repeated bending and temperature fluctuations. However, the installation is more convenient, and the process of welding and rubbing is less popular.

(5) neck butt welding (WN)

       Butt welding flange: neck flange welding is usually referred to as "high hub" flange. The purpose is to transfer pressure to the pipeline, thereby reducing the high stress concentration in the French base. The neck flange welding is the best design butt welding, which provides flange because of its own structural value. But the price is relatively high, because the production process is complex.

      Threaded (threaded) flange: the threaded flange is connected by threads. But the center of the product has a thread size corresponding to the pipe. The main advantage is that it can be assembled without welding.

      Sliding flange: sliding flange has a lower hinge, as the pipeline enters the single flange before welding. This is internal and external welding to provide enough strength to prevent leakage. Sliding flanges are the matching of slightly larger external diameter pipes. They are better than the neck flange welding, because the initial cost is low, many users, but the final installation cost will probably not be low, because the increased welding neck flange is less.

      Lap flange: the flanged flange is actually exactly the same sliding flange unless it has a radius between the hole and the flange race. It is necessary for the radius to have flange to accommodate the end of the lap stub. Usually, the mating flange and lap joint will be assembled at the end of the mating system.

The socket welding flange is a similar sliding flange unless it has a hole and a counterbore size. The matching of the counter hole and the pipe causes the pipe to be inserted into the similar sliding flange of the flange. The diameter of the smaller holes is the same as that of the ID for the same pipe matching. The restriction is built into the hole, as a dedicated pipe shoulder sleeve stays at the bottom. This eliminates any flow limitation in using socket welding flange.

(6) socket welding flange (SW)

The form of sealing surface: RF, MFM, TG and RJ.

       Material: carbon steel (Carbon Steel): ASTM A105,20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF1, and Q235, V, C, P, C, C, x, C, x, C, X;

Alloy steel (Alloy Steel): ASTM A182 F1, F5a, F9, F11, F12, F22, F91, F91, F11, x, C, P, C, C, C, C, C, III, etc.

Manufacturing standards: ANSI B16.5, GB/T9117.1-2000 - GB/T9117.4-200, etc.

(7) threaded flange (TH)

Nominal diameter of threaded flange: DN8 ~ DN100 working pressure: 1 ~ 2.5 (MPa) plate type flange material: stainless steel, carbon steel, alloy steel.

       The use of threaded flanges: fire and gas, hot and cold water, air conditioning, air pressure pipes, oil pipes, meters, hydraulic pipes and other industrial and civil pipe thread locking seal.

Flange cover (BL)

        Flanges, also known as blind flange, are flanges with no holes in the middle for sealing pipe plugs. There are many kinds of sealing surfaces, such as plane, convex, concave convex, tenon groove surface and ring connection surface.

       Sealing surface: flat (FF), raised surface (RF), concavo convex surface (MFM), tenon groove surface (TG), ring connection surface (RJ)

Production materials:

       Carbon steel (Carbon Steel): ASTM A105,20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF1, and Q235.

       Stainless steel (Stainless Steel): ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8;

Alloy steel (Alloy Steel): ASTM A182 F1, F5a, F9, F11, F12, F22, F91, F91, F11, x, C, P, C, C, C, C, III.

(8) Sleeve flange

       Loose sleeve flange butt weld ring loose sleeve flange with neck flange butt weld ring loose sleeve flange flat weld ring loose sleeve flange flange flange flange over loose sleeve flange. In addition, to meet the needs of locking device, there are rod holes, which can make bolts not loosen when vibration occurs. Some flange bolts without threads need to be thin, called thin rod flange bolts. This kind of flange bolt is beneficial to variable force. Connection. There are special high strength bolts on the steel structure. The head will be larger. The dimension of hot-dip galvanized round steel also varies. The alloy layer is produced by the reaction of molten metal and iron matrix.

Flat Welded Ring Loose Sleeve Flange (PJ/SE)

        Flat welded ring flange is movable flange, which is usually matched with water supply and drainage fittings (expansion joint is the most common). When the manufacturer leaves the factory, each end of expansion joint has a flange, which is directly connected with the bolts of pipelines and equipment in the project. The purpose of using flat welded ring flange is generally to save material. Its structure is divided into two parts. One end of the pipe is connected with the pipe, the other end is flanged, and the flange part is set on the flange. Flanges are made of low-grade materials, while pipes are made of the same materials as pipes to save materials.


Flat welded ring flange with loose sleeve:

1. Cost savings. When the pipe material is special and expensive, the cost of welding the same material is high.

2. It is not easy to weld or process or needs high strength. Such as plastic pipes, FRP pipes and so on.

3. Easy to construct. For example, the bolt holes of flanges are not easy to be aligned or to prevent the bolt holes of flanges from changing in the future.

Defects of flat welded ring flange with loose sleeve:

1. Low pressure.

2. Low strength at weld ring (especially when the thickness is less than 3mm)

Production Standard for Flat Welded Ring Flange with Loose Sleeve:

National Standard: GB/T9112-2000 (GB9113.1-2000-GB9123?4-2000)

American Standards: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW)

Daily Standards: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW)

German Standards: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634, 2545 (PL, SO, WN, BL, TH)

Ministry of Chemical Industry Standards: HG5010-52-HG5028-58, HGJ44-91-HGJ65-91

Flange Standard: HG20592-2009 (PN Series) HG20615-2009 (Calss Series)

Ministry of Machinery Standards: JB81-59-JB86-59, JB/T74-1994, JB/T79-94-JB/T86-94

Pressure Vessel Standards: NB/T47020-2012-NB/T47027-2012, JB1157-82-JB1160-82 B16.47A/B B16.39 B16.48

      Marine lap welded steel flange standard number: This standard is applicable to marine products and marine engineering products. The main materials are: carbon steel, alloy steel, low temperature steel, stainless steel.

       Forging flange connection is to connect two pipelines, pipe fittings or equipment, and forging flange connection is an important connection way in pipeline construction. Forging flange connection is easy to use and can withstand greater pressure. In industrial pipelines, forged flange connections are widely used. In the family, the pipe diameter is small, and is low pressure, can not see the connection of the flange stamping elbow. If you are in a boiler room or production site, there are flanged pipes and equipment everywhere. The chromium content ranges from 0.1% to 0.5% (forged flange does not contain chromium in general), the carbon content is less than 1.0% and forged flange is manufactured by high temperature forging. Although the surface hardness of some forged flanges (HRC) can reach more than 56 (hardened layer is only about 15_), the hardness of the center of forged flange is generally only 30 degrees due to poor hardenability of the forged flange material, which is often used in normal conditions. Water quenching treatment.

Flange protection cover (flange protection joint)

Flange shield is mainly used for anti-corrosion of flange joints in all industries.


       The flange protection head of the product is used to protect the flange surface (convex or ring joint). Double-ended studs and gaskets are free from corrosion. This product is suitable for 316SS stainless steel and non-metal (plastic), its manufacturing dimension from & frac12; "to 144" ANSI, API and AWWA flange connection diameter. Flange head system combined with flange packing can be protected in harsh application environment.

The structure of flange sealing cover:

316 Stainless Steel Strip or Nonmetallic Strip

316 SS castings

316SS Worm Gear Fixture

Closed tank chloroprene rubber layer (temperature. - 34.4 C to 82 C)

ECH rubber liner (temperature. - 34.4 C to 149 C) safety relief valve can release 5 psi

Flange packing system

Suitable for 80 degree C temperature.

Flange packing is a unique solution for long-term corrosion problems.

Flange packing is a composite polar polymer coating. The paste form can be used without pretreatment. The viscoelastic formula allows the material to flow into space and space, resulting in an excellent corrosion resistant seal.

        Flange packing system flange packing is easy to use and saves time and money. Providing long-term protection.

        Performance: excellent adhesion to steel, FBE (melting epoxy powder), polyurethane, polyethylene high resistance weather resistance / salt resistance temperature range from -51 to C 80 to C fill the entire void. Removable / repeated use of flanged surface does not require too much pretreatment. Manual or pneumatic guns with flexible nozzles are injected slowly. This ensures that the annular gap is completely filled before the CZ winding tape is sealed.

E-2400/E2000 high temperature flange packing - suitable for 149 degree C temperature.

E-2400/E2000 high temperature anti-corrosion flange packing is designed to protect flange connections from corrosion at temperatures up to 149 degrees C.

E-2400/E2000 is an anticorrosive protection of steel flanges, bolts, pipes and structures with a gel in a non electrolytic manner.

ASTM-B1117 salt spray test is used to test the nuts and bolts assembly for 2000 hours. The area protected by E2000/2400 can still be rotated by hand. Use E2000/2400 correctly to protect flange connections from corrosion.


What are the technical standards and application scope of flanges?

(9) high temperature flange seal

        High temperature flange parts often need a high temperature seal. If there is no additional sealant in the separate pressure area, pressure will cause inaccuracy or deformation of the production. That is to say, there will be leakage under pressure in the separate pressure area, which requires external repair. The best application in high temperature plane seal is bocor high temperature sealant. Its special formula keeps it inert in the standard application of steam and gas turbine and high temperature flange, so it can bear hot air, steam, water, light fuel oil and lubricants, and can withstand crude oil and natural gas. It is a single component, paste sealant, industrial use, high quality seal mixture, suitable for smooth, flat cover (butt joint) temperature and pressure requirements of high working conditions. Use plaster or rubber scrapers to spread on dry surfaces. Because the sealing product will not solidify, its consistency will change slightly, maintain flexibility and elasticity, so there is no time requirement in use. After construction, it can be put into operation immediately without waiting.

         Flange connection means that two pipes, fittings or equipment are fixed on a flange first, and the flange between two flanges is fastened together with bolts to complete the connection. Some pipe fittings and equipment have their own flange, and also belong to flange connection. Flange connection is an important connection way in pipeline construction. Choose high quality flange manufacturers to identify titanium machinery. Flange connection is easy to use and can withstand great pressure. Flange connections are widely used in industrial pipelines. In the family, the diameter of the pipe is small, and it is low pressure, so the flange connection is not visible. If in a boiler house or production site, there are flanged pipes and equipment everywhere.

      According to the connection type, the flange connection types can be divided into: plate type flat welding flange, neck flat welding flange, butt butt welding flange, socket welding flange, threaded flange, flange cover, neck butt welding ring loose flange, flat welding ring loose flange, ring groove flange and flange cover, large diameter flat flange, large diameter high neck flange, eight character blind plate, butt welding ring loose flange etc.

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