ANSI B16.5 vs. EN 1092-1

Attribute	ANSI B16.5	EN 1092-1
Standard	ANSI	EN
Pressure ratings	Class 150, 300, 600, 900, 1500, 2500	PN 6, 10, 16, 25, 40, 63, 100, 160, 250, 320, 400
Flange facing type	Raised face (RF), Ring type joint (RTJ)	Type A, Type B, Type C, Type D, Type E, Type F, Type G
Size range	1/2" to 24"	DN 10 to DN 4000
Materials	Carbon steel, stainless steel, alloy steel, etc.	Carbon steel, stainless steel, alloy steel, etc.

Introduction

Flanges are essential components in piping systems, used to connect pipes, valves, and other equipment. Two widely recognized standards for flanges are ANSI B16.5 and EN 1092-1. While both standards serve the same purpose, there are differences in their attributes that make them unique. In this article, we will compare the key features of ANSI B16.5 and EN 1092-1 to help you understand their differences and make an informed decision when selecting flanges for your application.

Pressure Ratings

One of the significant differences between ANSI B16.5 and EN 1092-1 is their pressure ratings. ANSI B16.5 flanges are rated for pressure classes ranging from 150 to 2500, while EN 1092-1 flanges are rated for pressure classes ranging from PN 6 to PN 100. This means that ANSI B16.5 flanges can withstand higher pressures compared to EN 1092-1 flanges, making them suitable for applications that require higher pressure handling capabilities.

Materials and Dimensions

Another key difference between ANSI B16.5 and EN 1092-1 is the materials and dimensions specified in each standard. ANSI B16.5 covers flanges made from materials such as carbon steel, stainless steel, and alloy steel, with dimensions specified in inches. On the other hand, EN 1092-1 covers flanges made from materials such as carbon steel, stainless steel, and aluminum, with dimensions specified in millimeters. This difference in materials and dimensions can impact the compatibility of flanges with other components in the piping system.

Flange Facings

Flange facings are another aspect where ANSI B16.5 and EN 1092-1 differ. ANSI B16.5 flanges typically have raised face (RF), flat face (FF), and ring-type joint (RTJ) facings, while EN 1092-1 flanges have flat face (FF), raised face (RF), and tongue and groove (TG) facings. The choice of flange facing can affect the sealing performance and compatibility with gaskets, so it is essential to consider this aspect when selecting flanges for your application.

Flange Types

Both ANSI B16.5 and EN 1092-1 cover a wide range of flange types, including weld neck, slip-on, socket weld, blind, and lap joint flanges. However, there are differences in the design and dimensions of these flange types between the two standards. For example, ANSI B16.5 weld neck flanges have a tapered hub, while EN 1092-1 weld neck flanges have a straight hub. These differences in design can impact the installation and performance of the flanges in the piping system.

Testing and Certification

Testing and certification requirements are crucial considerations when selecting flanges for critical applications. ANSI B16.5 and EN 1092-1 have specific testing and certification requirements to ensure the quality and performance of flanges. ANSI B16.5 flanges are typically tested and certified according to ASME standards, while EN 1092-1 flanges are tested and certified according to European standards. It is essential to verify that the flanges meet the required testing and certification standards to ensure their reliability and safety in the application.

Conclusion

In conclusion, ANSI B16.5 and EN 1092-1 are two widely recognized standards for flanges, each with its unique attributes and specifications. While both standards serve the same purpose of connecting pipes in piping systems, there are differences in pressure ratings, materials, dimensions, flange facings, types, and testing requirements. Understanding these differences is essential to select the right flanges for your application. By considering the key features of ANSI B16.5 and EN 1092-1, you can make an informed decision and ensure the reliability and performance of your piping system.