SO with neck flat welding flange

The full name of SO neck flat welding flange is neck flat welding steel pipe flange, which is a flange that extends steel pipes, fittings, etc. into the flange and connects them to equipment or pipelines through fillet welds. Neck welding flanges also belong to flat welding flanges, because they have a short neck, which improves the strength and load-bearing capacity of the flange, so they can be used on pipelines with higher pressure.

A flange, also known as a flange, is a component that connects pipes to each other. There are holes on the flange, and bolts tightly connect the two flanges. Flange connection refers to a detachable connection composed of flanges, gaskets, and bolts that are connected to each other as a combined sealing structure. Pipeline flange refers to the flange used for piping in pipeline devices, and used on equipment refers to the inlet and outlet flange of the equipment. Seal the flanges with gaskets. Flanges are divided into threaded flanges and welded flanges.

Flanges can be divided into carbon steel according to their manufacturing materials: (20 #, A3, Q235, Q235A, Q235B, 20G, 16Mn, Q345, Q345R, ASTM A234WPB, ASTM A105, etc.); Stainless steel: (304, 304L, 316, 316L, S30408, S30403, S31608, S31603, SUS304, ASTM A403, TP321, TP317L, 347, 0Cr18Ni9, 00Cr19Ni10, 00Cr17Ni14Mo2, 1Cr18Ni9Ti, 06Cr17Ni12Mo2, 022Cr17Ni12Mo2, etc.); Alloy steel: (16MnR, Cr5Mo, 12Cr1MoV, 10CrMo910, 15CrMo, 12Cr2Mo1, A335P22, St45.8/III, A10bB, etc.); Special alloy steel: (TP310S, 904L, Incoloy800, Incoloy825, Incoloy600, Incoloy625, etc.); Dual phase stainless steel: (F51, S31803, S2205, F53, 2507, S32750, F55, 2607, S32760, etc.);

Common types and codes of SO neck flat welding flanges: 1. PL plate flat welding flange, 2. SO neck flat welding flange, 3. WN neck flat welding flange, 4. SW socket welding flange, 5. Th threaded flange, 6. BL flange cover, 7. Eight character blind plate, 8. PJ/SE neck flat welding ring loose flange, 9. PJ/PR neck flat welding ring loose flange, 10. reducing flange, 11. stainless steel flange, 12. pressure vessel flange, 13. American standard flat welding flange, 14. American standard SO neck flat welding flange, 15. American standard WN neck flat welding flange

Common sealing surface form codes for flanges: convex surface RF, concave surface FM, convex surface M, tenon surface T, groove surface G, full plane FF, ring connection surface RJ

Common execution standards for flanges: The current flange standards in China are divided into two systems, namely the PN series (European system) and the Class series (American system). The pressure markings specified in this standard are divided into PN markings and Class markings. The PN label has 12 pressure levels, namely: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400。 The Class label has 6 pressure levels, namely: Class 150; Class 300; Class 600; Class 900; Class1500; Class 2500。 The implementation standards include GB series (national standards), JB series (mechanical department), HG series (chemical department), ASME B16.5 (American standard), BS4504 (British standard), DIN (German standard), JIS (Japanese standard).

National standards for flanges: GB/T9112-2010, GB/T9119-2010, GB/T9116-2010, GB/T9115-2010

Standard of the French Ministry of Chemical Industry: HG/T20592-2009、HG/T20615-2009、HG5010-52～HG5028-58、HGJ44-91～HGJ65-91、HG20592-97

Flange American standards: ASME B16.5, ASME B16.47

Flange Machinery Department Standards: JB81-59~JB86-59, JB/T79-94~JB/T86-94, JB/T74-1994

Standard for flange pressure vessels: NB/T47020-2012 、NB/T47021-2012(JB/T4701)、NB/T47022-2012(JB/T4702)、NB/T47023-2012(JB/T4703)、NB/T47024-2012(JB/T4704)