High And Low Pressure Flat Welding Flange National Standard With Diameter Butt Welding Flange

High And Low Pressure Flat Welding Flange National Standard With Diameter Butt Welding Flange

1. Flange connection or flange joint refers to the detachable connection which is connected by flange, gasket and bolt as a group of assembled sealing structure. Pipe flange refers to the flange with pipe in the pipeline device, and refers to the import and export flange of the equipment when used in the equipment.
2. Several systems of international pipe flange standards
1) European flange system: German DIN (including Russia)
A, nominal pressure: 0.1, 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.4, 10.0, 16.0, 25.0, 32.0, 40.0 Mpa
B. Common calculation diameter: 15~2000mm
C, flange structure type: flat welding plate, flat welding ring loose sleeve type, roll edge loose sleeve type, roll edge loose sleeve type, welding ring loose sleeve type, welding type, neck thread connection type, integral and flange cover
D, flange sealing surface: flat surface, concave surface, concave surface, tenon groove surface, rubber ring connection surface, lens surface and diaphragm welding surface
E. The Co-recording standard for OCT pipe flanges issued by the Soviet Union in 1980 is similar to the German DIN standard and will not be described in detail
2) American flange system: American ANSI B16.5 "Steel pipe flanges and flanged pipe fittings" ANSI B16.47A/B "Large Diameter Steel flange"
A, nominal pressure: 150psi (2.0Mpa), 300psi (5.0Mpa), 400psi (6.8Mpa), 600psi (10.0Mpa), 900psi (15.0Mpa), 1500psi (25.0Mpa), 2500psi (42.0Mpa),
B. Common calculation diameter: 6~4000mm
C, flange structure type: strip welding, socket welding, thread connection, loose sleeve, butt welding and flange cover
D, flange sealing surface: concave surface, concave surface, tenon groove surface, metal ring connection surface
3) ***JIS pipe flanges: generally only used for public works in petrochemical installations, with little international influence and no independent system in the world.
3, China's steel pipe flange national standard system GB
1) Nominal pressure: 0.25mpa ~ 42.0mpa
A, Series 1: PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 (main series)
B, Series 2: PN0.25, PN0.6, PN2.5, PN4.0
The flanges of PN0.25, PN0.6, PN1.0, PN1.6, PN2.5 and PN4.0 belong to the European flanges system represented by German flanges, while the rest belong to the American flanges system represented by American flanges.
In GB standard, the maximum nominal pressure level belonging to the European flange system is 40Mpa, the maximum nominal pressure level belonging to the American flange system is 42Mpa.
2) Nominal diameter: 10mm~1500mm
3) Flange structure:
Integral flange
Unit of the flange
A. Threaded flange
Welding flanges butt welding flanges
Flat welding flange with neck socket welding flange plate welding flange
C. Loose flange butt welding ring loose sleeve neck flange butt welding ring loose sleeve plate flange flat welding ring loose sleeve plate flange flip loose sleeve flange
D. Flange cover (blind hole flange)
E. Rotating flange
F. Anchorage flange
G. Surfacing/cladding flange

TOBO GROUP sales head offce in Shanghai.

We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicians.

We have five branch factories which can supply the best quality pipes, tubes, fittings flanges and related accessories. Now, it owns a number of advanced pipe production equipments, metal, forging, machining, cold forming, hot extrusion, such as heat treatment process, producing 60, 000 tons of pipe fittings. Company with a variety of detection devices, such as nondestructive testing, chemical analysis, metallographic examination, physical experiments. The technical is very strength, our main products contain fittingsforged socket welding fittings and threaded fittings, pipe weld and the materials of the products contain stainless steel ,duplex-stainless steel alloy steel.

In addition, we are authorized by more than 120 top-class mills from South Korea,Japan and China like JFE,SUMITOMO,POSCO,BAOSTEEL, TISCO,LISCO,.TPCO,HENGYANG VALIN and so on .

Our main products as follows:

• Stainless steel pipe & tube

(seamless pipe / welded pipe / square pipe / rectangular tube,duplex stainless / inconel tube)

• Carbon / alloy steel pipe & tube

(seamless pipe / ERW / SSAW / LSAW / UOE / hollow section pipe / Galvanized Pipe)

• Tubing and casting

(line pipe,water pipeline,gas pipeline,oil pipeline)

• Special steel tube

(copper tube/titanium tube/aluminium tube/nickel alloy )

• steel bar

(round bar/angle steel /flat steel/channel steel/steel wire)

• Pipe Fittings

(eblows, equal / reducing tees, concentric/eccentric reducers, caps, crosses, bends, dish end/end cup, stub ends, unions, couplings / hex couplings, swage nipples , nipples, hex. plug, sockolet, weldolet, thredolet, etc)

• Flange

(DIN flange/ AISI flange/blind flange/welding flange/stainless flange/slip on flange)

• steel sheet / coil

(stainless steel/carbon steel/alloy steel/galvanized steel/aluminium )

• Valve

(ball valve/gate valve/butterfly valve/globe valve/swing check valve/ check valve)

In order to comply with the global modernization services development trends and eliminating the varieties distress of the global enterprise‘s purchase in the consumables.. We coordinate the pressure pipe manufacturer which with the scale of production,quality control and high cost performance (has passed ISO 9001 quality series attestation, ccs, DNV,PED/97/23/EC,AD2000-WO,special equipment manufacturing license,ASME-SA182.through a variety of effective assort mechanism to make up the shortage of supply and Post-processing of VAT enterprise, and to supply high quality pipe fittings, because of the superior quality and good service, we have established long term business cooperation with more than 60 countries and areas,which covers Europe, Africa, South America, North America, Middle East, Taiwan and South East Asia and so on.

With many years effort and support from our valuable customers, these products have obtained a big market share in the world.

Our business principle is "Superior quality, Competitive price, Timely delivery and Considerate service " Standing to the principle of “Enterprises focus on the core business”, TOBO will actively promotes the globalization of business strategy approach, using advanced supply chain management technology to service for clients with higher quality and more competitiveness ‘ s products. At the same time, we sincerely reply your inquiry, honesty waiting for your visiting and wish to have cooperation with you at the any time. We welcome all the customers to contact us for more information. We assure you, with our technical knowledge and experience, our company will be one of your Stable, Continuate business parters in China.

info@tobo-group.com