Slip on Flanges - Shribhairav Metal Corporation

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Slip-on (SO) flanges are a type of flange characterized by a flat face on the sealing surface. They are commonly used in low-pressure applications. The term "slip-on" comes from their easy installation: they simply slip onto the end of a pipe or fitting and are then welded in place. Their bored inner diameter matches the pipe's outer diameter, ensuring a smooth flow of fluids or gases.

This article explores the fundamentals of SO flanges, including their working principles, advantages, and various types.

How Slip-On Flanges Work

SO flanges provide a secure and leak-resistant connection between pipes or fittings in a piping system. The process involves:

Slipping the Flange: The flange is slipped onto the end of the pipe, ensuring the flange's inner diameter matches the pipe's outer diameter for a smooth transition and consistent flow.
Welding: Once positioned correctly, the flange is welded to the pipe, creating a strong and durable bond.
Sealing: The flange's flat face provides a sealing surface that aligns easily with gaskets or rings to prevent leakage.

Advantages of Utilizing Slip-On Flanges

SO flanges offer several advantages, making them a popular choice in various piping systems:

Ease of Installation: The slip-on design allows easy mounting to the end of a pipe or fitting without complex alignment procedures, saving time and effort, especially when dealing with many flanges. Minor adjustments are possible after slipping the flange onto the pipe, further simplifying alignment.
Cost-Effective Solution: The simple design of SO flanges results in lower manufacturing costs compared to other flange types. This affordability makes them ideal for projects with budget constraints. Reduced welding also saves on consumables.
Availability and Compatibility: SO flanges are readily available in various sizes, materials, and pressure ratings, making it easy to find the ideal flange for specific needs. They are compatible with diverse pipe and fitting types, including carbon steel, steel alloys, and other materials, allowing for seamless integration with different systems.
Space Efficiency: SO flanges have a compact and streamlined design with a flat face, unlike weld neck or socket weld flanges with protruding necks. This design minimizes the overall footprint, allowing for more efficient use of space within the piping system. They also have a shorter length compared to other types.

Types of Slip-On Flanges and Their Applications

Standard Slip-On Flanges

Standard (or raised-face) SO flanges have a raised face on the sealing surface. This raised face provides a platform for the gasket, ensuring a reliable seal between the flange and the adjoining pipe or fitting. They are well-suited for low-pressure applications where the bolt-tightening force can adequately compress the gasket.

Lap Joint Slip-On Flanges

Lap joint SO flanges have a flat face with a separate backing flange. The backing flange slides over the pipe end and aligns with the lap joint stub end, which is then attached to the pipe. This design allows for rotational movement, providing flexibility in alignment during installation or maintenance. They are commonly used in systems requiring frequent dismantling or in applications with thermal expansion or contraction.

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