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304/304l Class300 Rf 1/2 inch Stainless Steel Raised Face Weld Neck Flanges
A weld neck flange, also called a tapered hub flange or high-hub flange, is a kind of flange that can relocate stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the flange. There are two welding neck flanges designs – the first type is used with wipes while the second, longer type cannot be used with pipes but with a process plant. The weld neck flange comprises of a round fitting that extends beyond the rim of the circumference. These flanges, typically manufactured from forging, are actually welded to pipes.
Materials for Flanges
Pipe flanges are manufactured in all the different materials like stainless steel, cast iron, aluminium, brass, bronze, plastic etc. but the most used material is forged carbon steel and have machined surfaces.
In addition, flanges, like fittings and pipes, for specific purposes sometimes internally equipped with layers of materials of a completely different quality as the flanges themselves, which are "lined flanges".
The material of a flange, is basically set during the choice of the pipe, in most cases, a flange is of the same material as the pipe.
All flanges, discussed on this website fall under the ASME en ASTM standards, unless otherwise indicated. ASME B16.5 describes dimensions, dimensional tolerances etc. and ASTM the different material qualities.
Each flange ASME B16.5 has a number of standard dimensions. If a draftsman in Japan or a work preparer in Canada or a pipefitter in Australia is speaking about a Welding Neck flange NPS 6, Class 150, Schedule 40 ASME B16.5, then it goes over the flange which in the image here below is shown.
If the flange is ordered, the supplier want to know the material quality. For example ASTM A105 is a forged carbon steel flange, while A182 is a forged stainless steel flange.
So, in a correct order to a supplier two standards must be specified.
A bolted flange connection is a complex combination of many factors
(Flange, Bolts, Gaskets, Process, Temperature, Pressure, Medium).
All these various elements are interrelated and depend upon one
another to achieve a successful result.
The reliability of the flanged joint depends critically upon
competent control of the joint making process.
Some other Disadvantages of flange connections..
Of course, flange connections have great benefits; some examples..
All types except the Lap Joint flange are provided with a raised flange face.
Q1. Are you trade company or factory?
A: We are trading company in shanghai, but we have five branch factories which can supply the best quality pipes, tubes, fittings flanges and related accessories. Welcome to visit us.