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The full name of the neck flat welding flange is the neck flat
welding steel pipe flange, which extends the steel pipe, pipe
fittings, etc. Into the flange and connects with the equipment or pipeline
through the fillet weld. The main differences between the butt welding flange and the
flat welding flange are different weld forms, different materials,
different nominal pressures and different connection methods.
Different weld forms: the flat weld cannot be radiographed, while
the butt weld can. The form of welding seam between the pipe with neck flat welding
flange and the flange is fillet weld, while the form of welding
seam between the flange with neck flat welding and the pipe is
circumferential weld. The form of flat welding is two fillet weld, and the form of butt
welding is one butt circumferential weld.
1. The difference between the neck flat welding flange and the neck
free flat welding flange is that the neck flat welding flange is
more than the neck free flat welding flange in the pipeline welding
position.
2. The neck free flat welding flange is also a flat flange, and the
boss without flange is also a flat fillet weld.
3. The weld joint between the neck butt welding flange and
the connecting pipe belongs to class B seam, and the weld joint
between the neck flat welding flange and the connecting pipe
belongs to class C seam. The NDT after welding is different.
4. Different materials: the material of welding flange with
neck is machined from ordinary steel plate with thickness meeting
the requirements, while the material of welding flange with neck is
mostly machined from forged steel parts.
5. Different nominal pressure: the nominal pressure of flat
welding flange with neck is 0.6-4.0mpa, while the nominal pressure
of flat welding flange with neck is 1-25mpa. Obviously, the applicable pressure level of flat welding
flange with neck is lower.
1. Different connection methods: the biggest difference
between the neck flat welding flange and the neck butt welding
flange in structure lies in the connection method between the
nozzle and the flange.
2. Generally, the neck flat welding flange is the fillet connection
between the nozzle and the flange, while the neck butt welding
flange is the butt joint between the flange and the nozzle.
3. The sealing surface forms of welding flange with neck are: RF,
FM, m, t, G and FF. Diameter range of flat welding flange with
neck: dn10 ~ DN600.
4 Scope of application: PN series pn2.5 ~ PN40; class series
class150 ~ class1500.
5. Flange material: carbon steel, Luomo steel, 304, 316, 304L,
316L, 321, 347, cf8c.
Application scope of flange sealing surface | |||||
Sealing surface form | Nominal pressure (MPA) | ||||
0.6 | 1.0 | 1.6 | 2.5 | 4 | |
Bursting surface (RF) | DX10—300 | DN10—600 | |||
Bump face (MFM) | DN10—600 | ||||
Vertebral groove surface (TG) | — | DN10—600 | |||
Full plane (FF) | DX10—300 | DN10—600 | — |
1, Advantages: the neck flat welding flange also belongs to
the flat welding flange, because it has a short neck, thus
improving the strength of the flange and improving the bearing
strength of the flange. So it can be used on pipes with higher
pressure.
2, Disadvantages: compared with plate type flat welding
flange, the cost is higher, because of its shape characteristics,
it is easier to bump during transportation.
1, The welding flange with neck is used for
corrosion-resistant, highly toxic, flammable and explosive
occasions.
2, The sealing surface of flat welding flange with neck can
be convex, concave and mortise face.
3, The sealing effect is not the same, and the bearing
strength is not the same.
4, There is a short neck behind the tail of flat welding
flange with neck, which can improve the rigidity of flange.
5, The bearing capacity is higher than that of flat welding
flange, which is generally used in medium and high pressure
occasions.
a. Plastic bubble bag package b.Wove bag package c.Pallet d. Customized
Our Seam Fillet Flat Neck Welding Stainless Steel Flanges factory have high ability for production, the delivery time is 45days for small quantity, or if you are hurry for that, we can arrange and meet your shipping date.