High pressure flange, pipe or equipment for the pressure higher than 10 mpa flange connection. At present, mainly including traditional flange and high pressure self-tightening type flange.
English name: High - Pressure flanges
Traditional high pressure flange: is the use of gasket (ellipse gasket, octagon gasket, lens gasket, etc.) of plastic deformation to achieve sealing effect, connection pipe, pipe and pipe connected parts, flange hole, stud makes the flange closely linked.
Generally by a flange, a gasket and a number of bolt and nut. Seal is installed in two of the flange sealing surface, tighten the nut, gasket on the surface of the pressure after reaching a certain value to produce plastic deformation, make joint not leak tight. This form can be used for flammable, explosive, toxic medium and high pressure situations but poor sealing reliability.
1, the sealing principle belongs to plastic deformation
2, by bolt connection
3, bolt to sustain tension, temperature stress, and under bending moment, torque, and many other applied stress
4, large volume, heavy weight, difficult installation position.
5, sealed performance is not stable, especially in the harsh (high temperature and high pressure, medium to be toxic) prone to leak, under the condition of serious consequences.
High pressure flange is mainly used in pipe installation, high pressure flange connection is an important connection mode of pipeline construction, the main connection between the tube and pipe connection, play an important role and value. High pressure flange connection is the two pipes, fittings or equipment, fixed on a flange, a first between the two flange, and flange pad, bolt fastening together, complete the connection. Some pipe fittings and equipment have been bringing flange, is also belongs to the flange connection. [1] high pressure flange product performance:
1, abrasion resistance, ceramic composite steel pipe lined with porcelain layer of Al2O3 content is more than 95%, micro hardness HV1000-1500, and therefore has a very high wear resistance, its wear resistance more than 10 times higher than the medium carbon steel after quenching and is better than that of tungsten carbide drill.
2, the corrosion resistance of ceramics is a neutral material, stable chemical performance, excellent corrosion resistance and acid resistance, can resist various inorganic acid, organic acid, organic solvents, such as its resistance to corrosion is stainless steel is more than ten times.
Carbon Steel (Carbon Steel) : ASTM A105, 20 #, Q235, 16 mn, ASTM A350 LF1, LF2 CL1 / CL2, LF3 CL1 / CL2, ASTM A694 F42, F46, F48, F50, F52, F56, the F60, F65, F70
Stainless Steel (Stainless Steel) : ASTM A182 F304, 304 l, F316, 316 l, 1 cr18ni9ti, 0 cr18ni9ti, 321, 18-8;
Alloy Steel, Alloy Steel) : ASTM A182 F1, F5a, F9, F11, F12, making, F91, A182F12, A182F11, 16 MNR, Cr5Mo,
Imported material: [1] (nickel steel), WC5 (1.25% 0.5% chrome molybdenum steel), WC9 chromium (2.25%), C5 (% 5% chromium molybdenum), C12 (9% 1% chromium molybdenum), CA6NM (4 (12% chromium steel), CA15 (4) (12% chromium), CF8M stainless steel (316), CF8C stainless steel (347), CF8 stainless steel (304), CF3 (304 l stainless steel), CF3M (316 l stainless steel), CN7M (alloy), (monel), N7M M35-1 (B) hastert nickel alloy, CW6M nickel alloy C (haas tower), CY40 nickel alloy, because of)
Product development
Such products, was born in the 1950 s, are widely used in petroleum and petrochemical, oil and gas, industrial gas production, oil refining, food processing, chemical industry, environmental engineering, fossil, and nuclear power, aerospace, shipbuilding industry, synthetic fuel processing, the coal oxidation and liquefaction, etc. In the Chinese market, these products fully rely on imports, domestic no one can design, production, until 2005, the situation was broken by domestic Chengdu plant source of mechanical technology. Production of Chinese high pressure self-tightening type flange ZY - LOC.
High pressure self-tightening type flange is introduced
ª self-tightening type high pressure flange: is a more conducive to high pressure, high temperature, high corrosion condition such as severe cases, a new type of high pressure flange pipe connection. Is to rely on traditional flange gasket plastic deformation in order to achieve the role of sealing and soft sealing, and high pressure self-tightening type is at the heart of the flange is unique to the new seal, which rely on the seal ring sealing lip (T arm) elastic deformation of the seal formation, belongs to hard seal. Use socket, card sets, sealing ring of the physique combination, form a strong rigid body, make the strength of the connection strength is much greater than the pipe base itself. In compression, and plays a role of strength and sealing lip respectively, both from the tight seal (1), and reinforcing pipe, greatly strengthened the connection part of the overall strength, in the field, is an epoch-making progress!
Notation (1) : since the tight seal: seal component not only affected by external connecting pieces of the force applied to seal, but also rely on the sealing medium pressure tight seal components, medium pressure is higher, the greater the pressure force on packing element. Quote from "mechanical design manual" volume 2 article first chapter 10
High pressure self-tightening type flange product structure: generally, every high pressure self-tightening type flange all by card sets, socket, sealing ring, bolts.
1, the metal seal ring: sealing ring is the core of the high pressure self-tightening flange parts, its cross section similar to the "T" shape. Flange assembly, sealing ring section of reinforced by two sets of the HUB end face clamping and mother tube form as a whole, drastically increase the strength of the connection parts; "T" shaped cross section of the two arms of the sealing lip, and generates a socket's internal cone sealing area, under the action of external force (yield limit range), free extension, form a seal.
Section 2, socket: two sets of the HUB is card sleeve is tight, the pressure on the sealing ring of muscle, and the sealing lip is deviating from the socket's internal sealing surface, this kind of deviation from elastic to socket internal sealing surface load back to lip seal ring, forming a self-reinforcing elastic seal.
3, the card sets: card set free adjustment can be 360 ° direction when installation, convenient installation.
4, four sets of spherical bolt: in general, each high pressure self-tightening type flange only four sets of tangential pressure spherical bolts to complete whole solid
1, sealing way: at the heart of the high pressure self-tightening type flange is unique, newer metal to metal seal, which rely on sealing ring sealing lip (arm) T the elastic deformation of formation
Seal; Reuse socket, card sets, sealing ring of the bones and muscles, form a strong rigid body, make the strength of the connection strength is much greater than the pipe base itself. In compression, and plays a role of strength and sealing lip respectively, both from the tight seal, and reinforcing pipe, greatly strengthened the whole strength of the connection parts
2, tensile sex: in most cases, the connection of the high pressure self-tightening type flange is more than the pipe itself can bear tensile load; Destructive test proves that the pipeline under tensile load expires, the flange is still in good condition without any leakage.
3, resistance to bending performance: a large number of tests show that the flange under bending load, still won't leak or loose, the actual test: DN15 specifications of the high pressure self-tightening type flange welding on the pipe through multiple cold bending, high pressure self-tightening type flange joint not leak, and bolt looseness.
4, the pressure resistance: normal piping applications, the high pressure self-tightening type overload under compression flange does not exist; Occurs at a higher compression load, high pressure self-tightening type flange on the ultimate strength along pipeline is one of the biggest load.
5, impact resistance, geometry size small, compact, can withstand the impact of the traditional high pressure flange cannot bear; Unique metal to metal seal structure, make its shock resistance increase greatly.
Corrosion resistance: different material make it corrosion resistance can meet the special anti-corrosion requirements of different using environment.
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