Nik-San Pipefit Engineering Co.

Carbon steel flanges are vital components used to connect pipes, valves, and other equipment in various industrial piping systems, offering a durable and cost-effective connection solution. They are available in different types, grades, and pressure ratings to suit specific application requirements. 

Weld Neck Flanges: These feature a long, tapered hub that is butt-welded to the pipe, providing significant strength and stress distribution. They are ideal for high-pressure and high-temperature applications where system integrity is critical.
Slip-On Flanges: Designed to slip over the end of the pipe and then be secured with fillet welds at both the inner and outer diameters, these are easy to install and a cost-effective option for low-pressure, low-temperature systems.
Blind Flanges: A solid disc used to seal or block off a pipeline or pressure vessel opening, allowing for easy inspection and maintenance access. They are suitable for high-pressure applications.
Socket Weld Flanges: Similar to slip-on flanges but with a socket for the pipe end and a single fillet weld on the outside, they are often used in high-pressure, small-diameter piping systems with limited space.
Threaded Flanges: These have a threaded bore and can be assembled without welding, making them suitable for non-critical, low-pressure, and highly corrosive environments where welding might be difficult.
Lap Joint Flanges: Used in conjunction with a stub end, these allow for easy alignment and frequent disassembly of piping systems.

ASTM A105/A105N: This is a common and widely used material for forged carbon steel flanges suitable for ambient and high-temperature services in pressure systems.
ASTM A350 LF2: This grade is specifically designed for low-temperature applications and requires notch toughness testing to ensure performance in cold environments.
ASTM A694: These flanges are used in high-pressure oil and gas transmission pipelines and are designed to withstand significant stress.
Pressure Ratings: Flanges are available in various pressure classes, including Class 150, 300, 600, 900, 1500, and 2500, as defined by standards like ASME B16.5.
Face Types: Common flange facing types include Flat Face (FF), Raised Face (RF), and Ring Type Joint (RTJ), which dictate the gasket and sealing method used.