Flange classification and use
source: | date:2019-07-06 14:18:52 |
Flange, also known as flange flange disk or flange. Flange is the connecting part between the pipe and the pipe, which is used for connecting the end of the pipe; There are also flanges used in the import and export of equipment for the connection between two devices, such as the reducer flange. Flange connection or flange joint refers to the detachable connection of flange, gasket and bolt as a group of combined sealing structures. Pipe Falanxi refers to the flange used in the pipeline device and is used on the equipment to refer to the import and export flange of the equipment. There are holes in the flange and the bolts make the flange tight. The flange is cushioned. Flange threaded joint(screw joint) flange, welded flange and clamping flange. Flange are used in pairs, low pressure pipes can use wire joint flange, more than four kilograms of pressure to use welding flange. Between the two flange plates, add a sealing pad and bolt it. Different flange thickness of different pressures, they also use different bolts. Pumps and valves, when connected to pipelines, are also locally made into corresponding flange shapes, also known as flange connections. All connecting parts that are bolted and closed at the same time around the two planes are generally referred to as "flanges", such as the connection of ventilation ducts. This type of part can be called "flange parts." However, this connection is only a part of the equipment, such as the connection between the flange and the pump, and it is not easy to call the pump a "flange part". Smaller ones, such as valves, can be called "flange parts." The reducer flange is used for the connection between the motor and the reducer, as well as the connection between the reducer and other equipment.
1: According to chemical(HG) industry standards: integral flange(IF), threaded flange(Th), plate flat welding flange(PL), neck to Hanfalan(WN), neck flat Hanfalan(SO), insert welding flange(SW) , PJ/SE, PJ/RJ, Falangai(BL(S)), Falangai(BL).
2: According to petrochemical(SH) industry standards: thread flange(PT), Hanfalan(WN), flat welding flange(SO), insert welding flange(SW), loose sleeve flange(LJ), Falangai(not table note).
3: According to the mechanical(JB) industry standards: integral flange, Hanfalan, plate flat welding flange, welding ring plate type loose flange, flat welding ring plate type loose flange, flanging plate type loose flange, turning edge plate type loose flange, Falangai.
4: According to national(GB) standards: integral flange, threaded flange, Hanfalan, with neck flat, with neck insert welding flange, welded ring with neck loosing flange, plate flat welding flange, welding ring plate loosing flange, flat welding ring plate loosing flange, Flange flange with flanging ring plate, Falangai.
Product Name: Hand-diameter Flange
Technical parameters: implemented according to national standards
Quality standards: production and manufacturing in strict accordance with relevant standards set by the state
Product Specification: DN 15-DN 2000
Packing: wooden cases or others
Product Color: Metal Color
Features: anti-corrosion, acid-base resistance, long service life, reasonable price calculation, smooth surface, acid and alkali resistance to high temperature, beautiful appearance, strong texture performance
Production process: professional integral forging, forging press manufacturing, cutting of medium plate, rolling of medium plate, etc..
Processing methods: high precision CNC lathe turning, ordinary lathe precision, argon arc welding, etc..
Nominal pressure SCH 5s, SCH 10s, SCH 20s, SCH 30s, SCH 40s, etc..
Manufacturing Standards: National Standard, American Standard, Russian Standard, Japanese Standard, etc..
Material: 201, 304.316.316L .0 Cr18Ni9.321.202, etc..
Uses: Widely used in water Conservancy, electric power, power station, pipeline parts, industry, pressure vessels, etc..
Connection mode: flange nut, bolt connection.
Fold stainless steel flange
Name: Stainless steel flange
Specification: 1/2 ′ ′ ~ 240 ′ ′(10-6000)
Pressure Level: 0.6 Mpa ~ 32Mpa, 150Lb ~ 2500 Lb, PN 0.25-PN 42.0
Material: 304, 304L, 321, 316, 316L, 310S and other materials
Chemical Ministry Standards: HG5010-52 ~ HG5028-58, HGJ44-91 ~ HGJ65-91, HG20592-2009(PN series), HG20615-2009(Calss series)
Scope of application: Boiler pressure vessels, petroleum, chemical, shipbuilding, pharmaceuticals, metallurgy, machinery, food and other industries.
Folding pressure vessel flange
Product name: Pressure vessel flange
Regulation: DN300 ~ 3000
Remarks: Pressure vessel flange application industry: HVAC building water supply pressure vessel fittings, pressure pipe fittings.
Product Category: Flange Series
Application Industry: HVAC power building water supply pressure vessel fittings, pressure pipe fittings.
Application of technical parameters
Sealed nominal pressure PN, MPa(bar) 0.6 1.0 1.6 2.5 4.06.4
Concave Convex(MFM) DN 1300 ~ 3000 DN 300 ~ 3000 DN 400 ~ 2000 DN 300 ~ 800
Ton slot surface(TG) DN 1300 ~ 3000 DN 300 ~ 3000 DN 300 ~ 3000 DN 300 ~ 800
Full plane(FF) DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 3000 DN300 ~ 800
Flat welding flange includes plate type flat welding flange, with neck flat Hanfalan.
Sheet welding flange(PL)
Flat welding flange is suitable for steel pipe connections with nominal pressure of not more than 2.5 MPa. The cover of flat welding flange can be made into smooth type, concave type and tenon type. The application of smooth welding flange is the largest. Used in the case of relatively mild medium conditions, such as low pressure non-purified compressed air, low pressure circulating water.
With neck flat Hanfalan(SO)
The neck height of Hanfalan with neck is low, and the stiffness and carrying capacity of the flange are improved. Compared with Hanfalan, the welding workload is large, the welding rod consumption is high, and it can not withstand high temperature and high pressure, repeated bending and temperature fluctuations. However, the on-site installation is more convenient, and the welding joint rubbing process can be omitted and is more popular.
Folded neck soldering(WN)
Weld flange: Neck flange welding is often referred to as "high hub" flange. Its purpose is to transfer pressure to the pipe, thereby reducing the concentration of high stress in the flange. Neck flange welding is best designed to weld those flange due to its own structural value. However, the price is relatively high because of the complex production process of the product.
Thread(thread) flange: This thread flange is connected by a screw buckle. However, the center of the product has a thread size corresponding to the pipe. Its main advantage is that it can be assembled without welding.
Sliding flange: Sliding flange has a lower hinge because the pipe enters the single flange before welding. This is the internal and external strength of the welding to provide sufficient to prevent leakage. Sliding flanges are all matched by slightly larger external diameter pipes. They are superior to the neck flange welding, due to the low initial cost of many users, but the final installation cost is probably not comparable because of the increased neck flange.
Pin flange: The flange is actually exactly the same sliding flange, unless it has a radius between the hole and the flange race. This is necessary for the end of the radius having flange housing splice stub. Usually, the system will be assembled together with the joint flange and the attachment stub mating at the end of the month.
The socket Hanfalan is a similar sliding flange unless it has a hole and an anti-hole size. The counter hole matches the pipe so that the pipe is inserted into a flange similar to a sliding flange. The diameter of the smaller hole is the same ID as the match of the same pipe. The restriction is built into the hole as a dedicated pipe shoulder cover stays at the bottom. This eliminates any traffic restrictions on using the socket Hanfalan.
Folded Plug-in Welding Flange(SW)
Plug-in welding flange
Socket Welding Flange
Inserted welding flange closed cover: protrusion(RF), concave convex(MFM), tenon groove(TG), ring connection(RJ)
Material: Carbon Steel: ASTM A105, 20 #, Q235, 16Mn, ASTM A350 LF1, LF2 CL1 / CL2, LF3CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70;
Alloy Steel: ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182 F12, A182 F11, 16MnR, Cr5Mo, 12Cr 1MoV, 15CrMo, 12Cr2Mo1, A335P 22, S458/SIII, 35MV, 35Cr wait
Manufacturing standards: ANSI B16 .5, GB/T9117.1 -2000-GB/T9117.4 -200, etc..
Flat-welded ring flange:
1, save costs. When the pipe material is special and expensive, the cost of welding flange of the same material is high.
2, is not easy to weld or is not easy to process or requires high strength. Such as plastic pipes, glass steel pipes and so on.
3, easy to build. If the flange bolt hole corresponding to the connection is not easy to find correct or prevent future replacement equipment flange bolt hole changes.
Disadvantages of flat ring flange:
1, low pressure.
2, the strength of the welding ring is low(especially when the thickness is less than 3mm)
Standard for production of flange flange for flat welded rings:
National Standard: GB/T9112 -2000(GB9113 · 1-2000 ~ GB9123? 4-2000)
American Standard: ANSI B16 .5 Class 150, 300, 600, 900, 1500(WN, SO, BL, TH, LJ, SW)
Japanese Standard: JIS 5K, 10K, 16K, 20K(PL, SO, BL, WN, TH, SW)
Debient: DIN2573, 2572, 2631, 2576, 2632, 2633, 2543, 2634, 2545(PL, SO, WN, BL, TH)
Chemical 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: JB4700-2000 ~ JB4707-2000, JB1157-82 ~ JB1160-82 B16 .47 A/BB16 .39 B16 .48
Ring Trough Flange and Falangai
Large diameter plate flange
Large diameter, high neck flange.
Eight words blind board
Right, solder ring. Loose flange 6.
Welding / overwelding flange
Standard number of steel flange used for welding: This standard is applicable to ship products and marine engineering products. The main materials are: carbon steel, alloy steel, low-temperature steel, stainless steel.
The production process is mainly divided into four types: forging, casting, cutting, and rolling.
Cast flange and forged flange
Cast flange, rough shape accurate size, small processing volume, low cost, but casting defects(air holes, cracks, inclusions); The internal organization of castings is less streamlined(if it is a cutting piece, the streamline is worse);
Forging flange is generally lower in carbon content than casting flange and is not easily rusted. Forging is streamlined, the tissue is relatively dense, and the mechanical properties are better than casting flange.
Improper forging process will also appear large or uneven grains, hardening cracks, forging costs higher than casting flange.
Forgings can withstand higher shear and tensile forces than castings.
The advantages of castings are that they can produce more complex shapes and lower costs;
The advantage of forgings is that the internal tissue is uniform, and there is no harmful defects such as pores and inclusions in the casting.
The difference between casting flange and forging flange is distinguished from the production process. For example, centrifugal flange is a kind of casting flange.
Centrifugal flange is a precision casting method to produce flange. This kind of casting is much finer than ordinary sand casting organization, and its quality is improved by a lot. It is not easy to have problems such as tissue looseness, stomata, trachoma, etc..
First of all, we need to understand how the centrifugal flange is produced and cast into a flat welding flange. The characteristics of the product are processed through the following process steps:
1 Put the selected raw material steel into a medium-frequency electric furnace to make the steel water temperature reach 1600-1700 °C;
2 Preheating metal mold to 800-900 °C to maintain constant temperature;
3 Start centrifuge, the steps 1 in the steel water injection step 2 in the preheating metal mold;
4 The castings are naturally cooled to 800-900 °C for 1-10 minutes;
5 Cool with water to near room temperature, remove casting.
Let's look at the process of forging flange:
Forging process is generally composed of the following processes, that is, the selection of high-quality billet material, heating, forming, forging after cooling. Forging processes include free forging, die forging and tread forging. At the time of production, different forging methods are selected according to the size of the forging quality and the number of production batches.
Free forging has low productivity and large processing margin, but the tools are simple and versatile. Therefore, they are widely used in forging single and small batches of forgings with simpler shapes. Free forging equipment includes air hammer, steam-air hammer and hydraulic press, which are suitable for the production of small, medium and large forgings. Die forging has high productivity, simple operation, and easy to realize mechanization and automation. Modular forgings have high precision in size, small machining margin, and the fiber tissue distribution of forgings is more reasonable, which can further improve the service life of parts.
The full name of die forging is model forging. The heated billet is placed in a forging die fixed on the die forging device.
In layman's terms, forging flange quality is better, generally through die forging production, crystal tissue fine, high strength, of course, the price is also more expensive.
Whether casting flange or forging flange is a common manufacturing method for flange, look at the strength requirements of the components to be used. If the requirements are not high, the flange can also be cut by the car.
III. Cutting flange
In the middle plate directly cut out the flange of the inner and outer diameter and thickness of the disk, and then bolt hole and waterline processing. The flange produced in this way is called a cut flange. The maximum diameter of such flange is limited to the width of the middle plate.
The process of cutting a strip with a medium plate and then rolling it into a circle is called rolling, and is mostly used in the production of some large flanges. After the roll is successfully welded, it is then flattened and then processed by the waterline and bolt hole process.
Scope of application
Due to its good comprehensive performance, the flange is widely used in basic projects such as chemicals, construction, water supply, drainage, petroleum, heavy and heavy industries, refrigeration, hygiene, water heating, fire protection, electricity, aerospace, and shipbuilding.
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