Flanges are essential to the piping system as they provide a connection point for pipes, valves and fittings. Choosing the right flange type is crucial to efficiently functioning and maintaining the piping system. In this blog post, we will compare the two types of flanges- SWRF (Socket Weld Raised Face) flange and SORF (Slip on Raised Face) flange, and highlight the differences, advantages and disadvantages of each.
What is SWRF Flanges?
SWRF Flange vs SORF Flange are a type of forged flange used for connecting pipes and other tubular components in many industries. Typically made from round bars, forged bars, hollow bars or hex bars, SWRF flanges are designed to be leakproof and strong enough to handle high pressures and temperatures. Choosindg the appropriate size and grade when purchasing this type of flange is important to ensure a secure connection that will last a long time.
What is SORF Flange?
SORF Flange is a type of flange used in pipe fitting. It is an integral part of the piping system and keeps pipes connected securely. SORF stands for Slip on Raised Face, indicating that the face of the flange bolts to a raised face on the mating parts. Depending on application requirements, the flange can be constructed out of round bars, forged bars, hollow bars or hexagonal bars. Moreover, SORF is used in low-pressure applications, and these types are most commonly found in small bore sizes ranging from 1/2 inch to 2 inches.
A Comparison of SWRF Flange vs SORF Flange
Design and Installation:
SWRF flanges have a socket at the base of the flange that fits the pipe, and the welding is done between the pipe and the socket. This design ensures a smooth and uniform transition between the pipe and the flange, which reduces turbulence and pressure drops in the piping system. The installation of SWRF flanges is time-consuming and requires skilled labour.
On the other hand, SORF flanges slide onto the pipe and are fixed in place with fillet welds. This design allows for easy and quick installation, and the required skilled labour is minimal. However, the gap between the pipe and the flange can cause turbulence and pressure drops in the piping system.
Strength and Durability:
SWRF flanges have a higher strength and durability due to the welding between the pipe and the socket, which provides more stability and support to the piping system. SWRF flanges are recommended for high-pressure and high-temperature applications.
SORF flanges are not as strong as SWRF flanges due to their fixed position on the pipe and the lack of welding between the pipe and the flange. SORF flanges are recommended for low-pressure and low-temperature applications.
SWRF flanges are the more expensive option due to the additional labour and expertise involved in their installation. The additional cost is offset by the long-term benefits of the smooth and uniform transition between the pipe and the flange, which reduces turbulence and pressure drops in the piping system.
SORF flanges are the more economical option due to their ease of installation and the minimal requirement for skilled labour. However, the cost savings must be weighed against the disadvantages of the gap between the pipe and the flange, which can cause turbulence and pressure drops in the piping system.
Both SWRF and SORF flanges are widely available in the market and can be sourced from various manufacturers. The availability of both flanges is not a significant factor in the selection process.
In conclusion, the selection of SWRF or SORF flanges depends on the piping system’s specific requirements and application. SWRF flanges are the stronger and more durable option but are more expensive and time-consuming to install. SORF flanges are more economical but are less strong and durable than SWRF flanges. Ultimately, the choice between the two types of flanges should be based on a careful evaluation of the cost, strength, durability, ease of installation and maintenance of the piping system.