Slip-on flanges are available at a lower cost and hence preferred by several contractors. The product holds ample of strength and works even under fatigue conditions as that of the weld-neck flange. The slip-on flange can work well after attaching to the end of a pipe or pipe fitting. The product is fit in easily, or the end of the pipe is set back easily by the thickness of the pipe wall plus 1/8 of an inch. It allows easy installation without putting effort and damaging to the flange face. The outer side of the flange is welded with a fillet weld.

Features of Slip-on flanges

These are flanges available at less cost. They have a low hub as pipe slips into the flange before performing welding. These slip-on flanges are easy to align welded, both internally and externally.

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.

Uses of Slip-on flanges

Slip-on flanges are primarily applicable for fluids working at low pressure. Also, these flanges work well with little chance of leakage. These flanges work well in cooling water lines, firefighting water lines, and low-pressure compressed airlines. Along with this, slip-on flanges are suitable in process lines to maintain the stream of steam, oil, gas, condensates, etc. These flanges are applicable for low pressure and higher temperature system.

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.

A blind flange is bolted, rather than welded in place. This allows easier access as needed for pipe system upkeep, inspection, or to allow for future expansion. Pairing with a gasket creates a tight seal: The gasket fills the space between the flange faces, which prevents liquid or gas leaks.

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.

Slip flanges or SO flanges are typically lower in cost hence making a common choice for the customers. A fillet weld is often welded to the back or exterior of the slip-on flange or SO flange. Because of their lower initial cost, they are favored over other flanges by many consumers, but the final installation cost is possibly not much less than that of the other flanges due to the additional welding involved.

Threaded Flanges

Threaded flanges are widely demanded as pipe flanges used in different industrial applications. They are the special type of pipe flanges which can be attached to the pipe without welding. Threaded flanges are threaded in the bore which match an external thread on the pipe.

These threads are tapered in order to create a seal between the threaded flange and the pipe as the tapers approach the same diameter. Sometimes a seal weld is also used together with the threaded connection. They are available in various sizes and materials.

Uses of 

threaded flanges

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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.

They can be used in extremely high pressure applications, particularly at or near atmospheric temperature, where the necessary post weld heat treatment is not possible.

They are ideal for small diameter piping applications.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.

These type of flanges are similar to slip-on flanges. The only difference is that it has a curved radius at the bore and face to accommodate a lap joint stub end. They may be used at all pressures and are available in a full size range. These lap joint flanges slip over the pipe, and are not welded. They are otherwise fastened to it. Here the bolting pressure is transferred to the gasket by the pressure of the flange against the back of the pipe lap.