2-1/2 in. Weld End x 10 in. Flange Size - 150# Black Ductile Iron Reducing Companion Flange (AWWA C110 / ASME B16.42)

A reducing companion flange is a type of flange used in piping systems to connect pipes of different diameters. It typically has a bolted end connection on one side, which mates with a matching flange (often a standard companion flange) using bolts and a gasket to create a secure, leak-proof joint. The other side is designed to connect to a pipe, usually via a threaded or socket-weld connection, depending on the specific design. The "reducing" aspect refers to its ability to transition between different pipe sizes, with the flange face having a larger diameter than the pipe connection side. This makes it ideal for systems requiring a size reduction while maintaining a flanged connection

The size of a socket weld reducing companion flange is determined by two key dimensions: the nominal pipe size (NPS) of the socket weld end and the flange size (which corresponds to the larger pipe or equipment it connects to). Here's how it works:

1. Socket Weld End Size:
   • The socket weld end is sized based on the¬ÝNPS¬Ýof the smaller pipe it connects to. For example, if the socket weld end is designed for a 1-inch pipe, it’s specified as 1" NPS.
   • The socket bore matches the pipe’s outer diameter (OD), and the socket depth accommodates the pipe’s insertion length per standards like ASME B16.11.
2. Flange Size:
   • The flange face is sized to match the larger pipe or equipment it bolts to, also specified by¬ÝNPS¬Ý(e.g., 2" NPS for a 2-inch flange).
   • The flange’s dimensions (OD, bolt circle diameter, number of bolt holes) follow standards like ASME B16.5 or B16.47, depending on the pressure class (e.g., 150#, 300#).
3. Reducing Specification:
   • The reducing companion flange is identified by both sizes, e.g., “1” x 2”” indicates a 1-inch socket weld end and a 2-inch flange face.
   • The flange’s bore on the socket side is reduced to match the smaller pipe, while the flange face aligns with the larger mating flange.
4. Pressure Class:
   • The flange’s pressure rating (e.g., Class 150, 300) must be specified, as it affects the flange’s thickness and bolt pattern. The socket weld end typically matches the schedule of the pipe (e.g., Sch 40, Sch 80).

BFO17RT1 Reducing Companion Flanges
The naming convention is as follows:
Welded End Size x Flange Size
Example: 1x5 would be a 5 inch flange that connects to a 1 in. welded connection.

BFO17TH1 Threaded Companion Flanges
The naming convention is as follows:
Threaded End Size x Flange Size
Example: 1x5 would be a 5 inch flange that connects to a 1 in. threaded connection.

Applications: Waterworks, Pump, Irrigation

Ductile Iron Flanges Class 150 & 300 Specifications:

• Ductile iron conform to ASTM A536
• Flange dimensions, drilling and materials in accordance with AWWA C110 / ASME B16.42
• Hot-dipped galvanized flanges conform to ASTM A153
• Companion flange threads conform to ASME B1.20.1
• Manufacturing facility is ISO 9001:2008
• These flanges are not UL Listed or FM Approved

150# & 300# Ductile Iron Flanges Catalog / Data Sheet

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