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Credibility ,The flange is connected to the part between the pipe and pipe, connecting pipe used for end flange in between; also useful equipment import and export of, for the connection between the two devices, such as the reducer flange. Flange connection or flange connection, is defined by the flange, gasket and bolt three are connected as a group of combined sealing structure of the detachable connection. Pipe flange refers to the pipeline installation of piping flange, used in equipment refers to equipment import and export flange. There are holes on the flange, bolt the two flange connect. The flange gasket seal. Sub threaded flange connection (threaded connection) flange, welding flange and clamp flange. Flanges are used in pairs, low-pressure pipeline can use the wire connected flange, four kg more than the use of pressure welding flange. Between the two flange with a sealing gasket, and then tighten the bolts. The different pressure of different thickness of flange, bolt they use are different. Pump and valve, connection and pipe, these equipment locally, also made the corresponding flange shape, also known as the flange connection. In general the two plane surrounding the use of bolted connection parts and closed, generally referred to as "flange", such as ventilation pipeline connection, the parts can be called "flange type parts". But this connection is only a partial one device, such as a connecting flange and a water pump, water pump is not good to call "flange type parts". Relatively small such as valves and so on, can be called "flange type parts".
Butt welding flanges are often used in
environments where media conditions are relatively mild, such as low pressure
non-purified compressed air and low pressure circulating water. The advantage
is that the price is relatively cheap. The sealing surface of the welding
flange can be divided into three types: smooth, concave and convex and grooved.
Smooth butt weld flanges are used in a wide range of applications, and the
other two types of butt weld flanges are also used in many applications. Butt
Welding has a reasonable structure, high strength and rigidity, and can
withstand various harsh environments such as high temperature and high
pressure, repeated bending and temperature fluctuation, and does not reduce the
sealing performance.
A butt weld flange is a type of pipe and
refers to a flange with a neck that has a transition of a round pipe and is
butt welded to the pipe. It is widely used at present because Butt Welding is
not easy to be deformed, sealed, and has a wide range of uses, and has
corresponding rigidity and elasticity requirements and a reasonable butt
welding thinning transition.
At the same time, because the distance
between the welding joint and the joint surface is large, the joint surface can
be protected from the welding temperature deformation, and a relatively
complicated structure is adopted, which is suitable for pipelines with high
pressure or temperature fluctuation or high temperature, high pressure and low
temperature pipelines. It is generally used for the connection of pipes and
valves with PN greater than 2.5 MPa; it is also used to transport expensive,
flammable and explosive media. In the production process, the welding flange is
strictly controlled in the production and welding to ensure that it can fully
play its role and value in production and use.
Butt welding flange refers to a flange with
a neck and a round tube transition and is butt welded to the pipe. It is not
easy to be deformed, has good sealing, is widely used, has corresponding
rigidity and elasticity requirements, and has a reasonable butt welding
thinning transition. . The relevant information on the welding flange is as
follows:
Butt weld flanges are especially suitable
for pipelines with high pressure or temperature fluctuations or high
temperature, high pressure and low temperature pipelines. They are generally
used for the connection of pipes and valves with PN greater than 2.5 MPa, and
also for expensive, flammable and explosive transportation. On the tubing of
the media.
The butt weld flange is the same as the
pipe to be welded at the interface end, and is welded like two pipes. The
production and use characteristics of Butt Welding are easy to use and can
withstand relatively large pressures. For welded flanges, materials are
produced according to different grades of pressure. From low-pressure asbestos
pads, high-pressure asbestos pads to metal mats. The welding flange is produced
and produced in different ways and processes in actual production and development.
According to the method and principle of the process, it can produce important
value and effect on different aspects, and add certain in actual production.
The elements that increase the characteristics and value of the carbon steel
flanges, perform well in terms of use characteristics and value. In industrial
pipes, the use of Chengdu welded flange connections is very extensive. In the
home, the pipe diameter is small and low pressure, and the connection to the
weld flange is not visible. If you are in a boiler room or production site,
there are flanged pipes and equipment products everywhere. In the actual
production process, the welding flange adopts certain technical parameters and
requirements for production and application to ensure correct use and promotion
according to certain methods and principles. Colleagues use certain process
methods and principles for production and welding. To ensure the reliable
quality of Butt Welding in use.
The product grade and technical
requirements for the butt weld flange are to comply with the relevant
requirements in JB4726-4728. Carbon steel or austenitic stainless steel
forgings with a nominal pressure of 0.25MP-1.0MPa are permitted, allowing them
to be manufactured with Class I forgings. Forgings with a nominal pressure
between 1.6 MPa and 6.3 MPa shall meet the requirements of Class II or Class II
forgings. For forgings for flanges with a nominal pressure of not less than
10.0 MPa, chrome-molybdenum steel forgings with a nominal pressure of more than
4.0 MPa, ferritic steel forgings with a nominal pressure of more than 1.6 MPa
and an operating temperature not exceeding -20 ° C, such flat welding Flange
forgings must comply with the relevant requirements for Class III forgings.
Normally, the butt weld flanges are manufactured using forging or forging
techniques. If it is to be made of steel or steel, it must meet these
requirements.
The butt welding flange factory must pass
the ultrasonic flaw detection test, and there should be no delamination defects
after inspection. It is to be cut into strips along the rolling direction of
the steel, and it is butt-welded into a ring shape by a bending process, and at
the same time, the surface of the steel is formed into a ring cylinder surface,
and it is not possible to machine the steel sheet material into a neck. Butt
welding flange. For the butt weld of the ring, it is necessary to adopt the
form of full penetration weld. The butt weld of the ring must be heat treated
after welding, and the test of 100% radiation or ultrasonic flaw detection
should be carried out, and the results of the radiographic inspection should be
consistent. For the Class II requirements in JB4730, the results of ultrasonic
flaw detection of Butt Welding must meet the Class I standard requirements of
JB4730. Butt weld flanges are necked, while flat weld flanges are not. If it is
for safety reasons, it is best to use butt welding. If it is normal medium, the
pressure is not high, and the leakage will not cause danger.
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Address:Longwan District, Wenzhou, Zhejiang Province, China.
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