Companion Flange

Introduction
The function of a companion flange is to enable pipeline connections by utilizing pairing to achieve connection and closure.
Sealing gaskets are positioned between the flanges, and fasteners are tightened to ensure reliability and sealing of the connection. Flange connections offer easy assembly and disassembly, facilitating convenient replacements.
When used in pairs, one is designed for instrumentation while the other is welded to the pipeline, mutually referred to as companion-flange. In this order guide, the flange welded to the pipeline is defined as the companion-flange, adhering to standard size specifications.

Function
• Welding neck flange
Applicable to various high-temperature and high-pressure pipeline equipment connections, the primary functions include pipe connection, enhancing safety, adapting to high-temperature and high-pressure conditions, and convenient maintenance.
• Plate flat welding flange
The sealing face is only applicable to RF Raised face (within the recommended range). Its advantages include a simple construction, easy installation, reduced equipment and cost investments, while meeting various pipeline operating conditions.
• Slip-on welding flange
Compared to other pipeline connection methods, its advantages lie in high-pressure resistance, corrosion resistance, excellent sealing, and ease of operation.
• Threaded flange
This is a type of flange that utilizes threading for pipeline connections, eliminating the need for welding. When the flange deforms, it imposes minimal additional torque on the cylinder or pipeline, making it suitable for highpressure pipeline connections.