There are different standards for pipe fittings. Pipe fittings of different standards are produced according to actual use. The main standards are ANSI, ASME, JIS, KS, MSS, DIN, etc. These standards mainly stipulate the size, pressure, design and material grade of pipe fittings. Compliance with these standards is crucial for various industries.

Types of pipe fitting standards:

Due to the wide use of steel pipes, a standard is required for material selection, production size, thickness, etc., so there are American standards, European standards, Japanese standards, etc.

American Standards

ASNI: is a private non-profit organization. Its main function is to manage and coordinate the US voluntary standardization and conformity assessment system. ANSI provides a series of pipe fittings standards, focusing on the size and materials of industrial and household systems.

ASME: American Society of Mechanical Engineers. It is one of the world’s famous organizations for formulating specifications and standards. The number of pipe fittings starts with ASME/ANSI B16. It focuses on accessories for high-pressure systems, covering the specifications of elbows, tees, reducers and caps.

The different classifications of the ASME/ANSI B16 standards for different pipe fittings are as follows:

ASME/ANSI B16.1 – 1998 – Cast Iron Pipe Flanges and Flanged Fittings

ASME/ANSI B16.3 – 1998 – Malleable Cast Iron Threaded Fittings

ASME/ANSI B16.4 – 1998 – Cast Iron Threaded Fittings

ASME/ANSI B16.5 – 1996 – Pipe Flanges and Flanged Fittings

ASME/ANSI B16.11 – 2001 – Forged Steel Fittings, Socket Welds and Threads

ASME/ANSI B16.14 – 1991 – Iron Pipe Plugs, Bushings and Locknuts with Pipe Threads

ASME/ANSI B16.15 – 1985 (R1994) – Cast Copper Threaded Fittings

ASME/ANSI B16.25 – 1997 – Butt Weld Ends

ASME/ANSI B16.36 – 1996 – Orifice Flanges, etc.

MSS: Standards developed for specific industry needs, such as MSS SP-43 and SP-75, often supplement ANSI and ASME guidelines.

European Standards

DIN (German Standards Institute): German standards are widely used throughout Europe and cover a wide range of fittings for pressure and non-pressure applications.

EN (European Standards): EN standards unify national standards within the European Union, ensuring compatibility and quality.

EN 10253 is divided into four parts

Part 1: Forged carbon steels for general use and without special inspection requirements;

Part 2: Non-alloy and ferritic alloy steels with special inspection requirements; widely used in the power industry.

Part 3: Forged austenitic and austenitic-ferritic (duplex) stainless steels without special inspection requirements;

Part 4: Forged austenitic and ferritic-austenitic (duplex) stainless steels with special inspection requirements.

Other Regional Standards

JIS (Japanese Industrial Standards):

JIS (Japanese Industrial Standards) are developed by the Japanese Industrial Standards Committee and maintained by the Japan Standards Association. This set of technical standards covers multiple industries such as electrical, mechanical and hydraulic systems. JIS standards specify the design, dimensions, materials and performance specifications of hydraulic fittings.

GOST (Russian Standards):

GOST standards are used in Russia and other CIS countries, especially in oil and gas pipelines.

Conclusion

Therefore, the standard of pipe fittings is of vital importance, which plays a key role in the safety and uniformity of the global industry. Whether the manufacturer strictly follows the standard during production is an important criterion for customers to verify the manufacturer.

FAQ

Difference between “Standard” and “Codes”

The main difference between piping codes and standards is their focus.

Piping codes focus on the design, construction, and maintenance of the entire piping system, providing guidelines for safety and operability.

Piping standards focus more on detailed requirements for specific components in the system, such as flanges, elbows, tees, and valves.

In simple terms, codes cover the overall management of the piping system to ensure its safety and functionality, while standards focus on the specifications and technical requirements for individual components used in the piping system. Both play a vital role in ensuring the reliability, consistency, and operational efficiency of the piping system.

Can different pipe fitting standards be used together?

Normally they cannot be used together.

However, they can be used together if the size, pressure level, connection method and material match and there is no welding damage.