Types of Slip-on flanges
There are various types of Slip-on flanges, including the Slip-On Reducing Flange, raised face slip-on flange, and RTJ slip-on flange. The flange is applicable for reducing the line size and limitation of the space limitations. These flanges work along with the weld neck flange and reducer combination. They are useful when the flow is directed from the smaller size to the larger size. Slip-On flanges are welded internally and externally. The welding offers them the ability to prevent leakage and sufficient strength.
Common Uses and Features of Blind Pipe Flanges
Blinds are flanges without a center bore (hole or opening) and are available in both Raised Face (RF) and Flat Face (FF) styles. While most flange types create a connection point that allows the flow of liquid, gas, or air, blind flanges are used to seal the end of a piping system and prevent flow. Blind flanges may be used when testing pipe pressure, to create an access point in a piping system, to temporarily seal a piping system while modifying or repairing the line, or to create a long-term seal to terminate a piping system.
Plate flange vs slip-on flange
A plate flange is a flat, circular disc welded to a pipe’s end enabling the flange to be bolted to another pipe. It is often referred to as flat flange, plain flange and flange slip, etc. Two plate flanges can be bolted together with a gasket in between them, usually used in fuel and water pipelines.
The length of the pipes is not always known while constructing a pipeline. The plates may also be welded with a slight bias to the shaft, allowing two pipes that might not be perfectly matched up to be joined.
Plate flanges have a serrated finish on the inner mating surface allowing the plate to fit within the material of the gasket. In any given dimension, plate flange designs are standardized regardless of the materials used to manufacture them. This ensures it exactly fit a 6-inch (15 cm) black pipe flange to a 6-inch stainless steel flange. This guarantees a perfect seal between the two connecting pipes.
Slip-On flanges also known as SO flanges, or reducers, long-tangent elbows, and swags are built to slip over the outside of the pipe. The flange has low vibration and shock resistance. Aligning a slip-on flange is simpler than any other flange. The slip-on flange is suitable for applications with low pressure as the strength is around one third that of a weld neck flange when under internal pressure. The Slip-on flange features an elevated profile
Uses of threaded flanges:
Threaded flanges can be fitted to pipes of various sizes without welding and this is one chief benefit for which these flanges are highly demanded.
Lap Joint Flanges
Lap Joint flanges are used on piping fitted with with lapped pipe or with lap joint stub ends. The lap joint flange with the stub end assembly are normally used in systems requiring frequent dismantling for inspection and cleaning and where the ability to swivel flanges and to align bolt holes materially eases the erection of large diameter or unusually stiff piping. These flanges are also used in applications where there is a need to facilitate bolt alignment.