Generally screwed together, flange joints are created by bolting two flanges together creating a seal. There are different types of flanges available depending on their usage and industry they are used for. Some of the most common used flanges are welding neck flange, slip on flange, lap joint flange, blind flange, reducing flange etc. Flanges are not recommended in underground piping where they have to be buried.
With our day to day life surrounded by machines all around us, it is impossible not to notice flanges all around us. A flange is an external or internal ridge or rim provided for support andattachment to another object that it gets attached to. Some of the most common example of flanges are iron beams in the form of I-beam or T-beam, on the lens mount of a camera, ski shoes with rim on the toes and heel part of shoes, rail cart wheel with flange on one side of wheel, microwave, piping system where pipes are joined. Flanges can be combined with other flanges to form a flange. Flanges not only provide easy access for cleaning but also for inspection and modification.
Since the work of flange is to keep the system in place and together without any leakage or failure, it is very important to identify the usage and material for manufacturing the flanges. The flange is generally manufactured in the same material as the material of connecting machines as different material can compromise on stability. Some of the most common flange materials are stainless steel, carbon steel, aluminium, nickel alloy, plastic etc and are listed below:
The manufacturing of the flanges follows the international standard ASTM. These ASTM standards, define the specific manufacturing process of the material by determining the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., which are specified by "Grade". ASTM examples are mentioned below:
There are other ASTM standards available that defines the different material specifications.
Some of the examples for Grade are:
After welding, the flange is considered as the most widely used joining method in case of requirement of dismantling of the joints and requires continuous maintenance. Though it is widely used and manufactured using the ASTM standards, it is globally accepted providing the same specifications flanges across the world.
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