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The welding seam between the necked butt welding flange and the pipe is in the form of a girth weld.
The nominal pressure of steel parts machined is different:
the report focuses on the project investment analysis and provides a detailed analysis of the market environment faced by the entire project and the calculation of future investment returns for various investors.
The report is based on objective facts and has excellent reference value for enterprises and capital institutions that intend to invest in marine flange projects.
Elite flange manufacturers, but the heating of butt welding flanges also brings a series of production problems, such as superheated oxidation decarburization and overburning.
Accurate control of the initial and final forging temperatures has a great influence on the structure and properties of butt-welded flanges.
Flame furnace heating has the advantages of low production interest and wide applicability, but the heating time is long, oxidation and decarbonization are prone to occur, and the production conditions need to be continuously improved.
The electric induction heating furnace has the characteristics of fast heating and less oxidation, but it has poor adaptability to changes in the shape, size and material of the blank. Die forging is produced under the action of external force.
Therefore, the correct calculation of deformation force is the basis for selecting butt welding flange equipment for forging die verification.
The butt welding flange has a long service life, so the design scheme of insulation flange, low-voltage flange and insulation elite flange manufacturers should pay more attention to the breakthrough of details, and use the ingenious design of the product to continuously improve its performance.
Insulation flange, low-pressure flange, or insulation flange manufacturer is a general term for pipeline flange joints that have both the sealing performance required by buried steel pipelines and the electrical insulation performance required by electrical corrosion protection projects.
The metal strip is fixed by spot welding to ensure the tightness of the flange connection.
The selection of flange gaskets must be resistant to high temperature and high pressure, corrosion resistance, good compression rate and rebound rate, etc. Here, I will share with you the main classification of stainless steel flange gaskets.
Graphite gasket, flat gasket made of soft graphite, suitable for high temperature and strong corrosive media. Second,
there are three main types of metal gaskets:
1) Octagonal and elliptical gaskets – suitable for trapezoidal groove flange sealing surfaces;
2) The tooth form is a bevel tooth shape processed on the sealing surface of a flat metal gasket Corrugated – suitable for concave-convex flange sealing surface;
3) Lens pad – suitable for lens flange sealing surface. Metal gaskets are made of pure iron, extremely mild steel, stainless steel, aluminum and other materials.
The processing accuracy and surface roughness of the sealing surface of the metal gasket is very high, and the bolt pressing force is very large, which is used for high-temperature and high-pressure valves.
Third, metal-clad graphite gaskets are made of thin metal-clad annular asbestos gaskets. Generally used in concave-convex flange sealing surfaces.
Valves for higher temperatures and pressures. Fourth, the spiral wound gasket is formed by mixing the corrugated metal strip and the sealing material strip.
There are many kinds of steel belts – asbestos steel belts – PTFE steel belts – flexible graphite and so on.
Generally used for concave-convex flange sealing surface. Suitable for medium-pressure valves at higher temperatures.
Fifth, it is generally used for tongue-and-groove sealing surfaces, mainly including polytetrafluoroethylene and glass fiber polytetrafluoroethylene. Suitable for low temperatures and various pressures
With the rapid development of long-distance pipeline construction at home and abroad, the pressure test of the pipeline has become an indispensable and important link.
Before and after the pressure test, each section of the pipeline must be swept through the ball, and the number of times is generally 4 to 5 times.
Especially after the pressure test, the water in the pipeline is difficult to clean, and the cleaning times will be more.
The construction method of using repeated welding heads at the ball-receiving place has problems: first, it increases the labor intensity of workers;
second, the repeated welding head method requires high consumables and large equipment times and high costs.
Pipe flanges and their gasket fasteners are collectively referred to as flange joints.
A flange joint is a kind of component that is widely used in engineering design and involves a wide range of surfaces.
It is an essential part of piping design, pipe fittings and valves, and also an essential component of equipment and equipment parts (such as manhole sight glass level gauge, etc.).
In addition, other professions such as industrial furnace thermal engineering, water supply and drainage, heating and ventilation automatic control, etc., also often use flange joints.
For pipe fittings, please link: https://bekingpiping.com