ASME B16.9 Specification for Butt Welded Pipe Fittings

ASME B16.9 specification is designed for butt welded fittings applied in industrial construction pipelines. Including elbow, tee, cross, cap, reducer, etc.

The ASME B16.9 standard is a crucial reference for the piping industry. It provides detailed specifications for factory-made, wrought butt-weld fittings, which are essential for connecting pipes in various industrial applications. This ensures smooth flow and structural integrity in systems that transport liquids, gases, or other materials.

Scope of ASME B16.9

This Standard covers overall dimensions, tolerances, ratings,testing,and markings for factory-made wrought buttwelding fittings in sizes NPS 1/2 through NPS 48 (DN 15 through DN 1200).

Units

Units under ASME B16.9 shall be stated in both SI (Metric) and U.S. Customary units. Designation for size is NPS.

Reference Standards

A product madeto comply with a prior edition of referenced standards and in all other respects conforming to this standard will be considered compliant.

• ASME B16.5: Pipe Flanges and Flanged Fittings: NPS 1∕2 Through NPS 24 Metric/Inch Standard
• ASME B16.25: For Buttwelding Ends
• ASME B31: Code for Pressure Piping
• ASME B31.3: Process Piping
• ASME B36.10M, Welded and Seamless Wrought Steel Pipe
• ASME B36.19M, Stainless Steel Pipe
• ASME Boiler and Pressure Vessel Code
• ASTM A234/A234M-17, Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
• ASTM A403/A403M-16, Specification for Wrought Austenitic Stainless Steel Piping Fittings

SIZE

NPS is followed by a dimensionless number, which is an indication of the nominal fitting size. NPS is related to the reference nominal diameter D N used in international standards. In general, the relationship is as follows:

Standard marking

1. Each pipe fitting marks permanently , indicating the following content:
2. The name or trademark of the manufacturer
3. Material identification mark (ASTM or ASME level symbol)
4. Wall thickness serial number or nominal wall thickness
5. Specifications – Engineering pipe diameter (NPS) related to end connection should be used
6. Compliance – standard and special pipe fittings

We supply a Range of Butt Weld Pipe Fittings refer ASME B16.9:

Standard: ASTM A234, MSS SP-75, ASTM A403, ASTM A420
Types: Elbow, Tee Equal and Reducing, Cap, Concentric/Eccentric Reducer,cross, bend.
Surface Coatings: Black Painted, Varnished, Epoxy Coated, Galvanized

FAQ：

Q: What is the difference between ASME B16.9 and ASME B16.11?
A： ASME B16.9 pertains to factory-made wrought butt-welding fittings, which are welded to the pipe. ASME B16.11 covers forged fittings, such as socket weld and threaded fittings, used for smaller diameter pipes.
Q: Are there any pressure ratings specified in ASME B16.9?
A： No, ASME B16.9 does not specify pressure ratings for fittings. The fittings are designed to match the pressure ratings of the pipe they are welded to, according to the material and design criteria of the piping system.
Q: How are ASME B16.9 fittings identified?
A： Each fitting is marked with the manufacturer’s name or trademark, material identification, nominal pipe size, schedule or wall thickness, and other applicable marks to ensure traceability and quality assurance.
Q: Can ASME B16.9 fittings be used in high-temperature applications?
A：Yes, ASME B16.9 fittings can be used in high-temperature applications if the material selected is suitable for those conditions and meets the relevant design standards.

Why choose JSFITTINGS as Your Trusted Supplier of B16.9 Steel Pipe Fittings?

• 40-years experience in manufacturing and supplying carbon steel seamless and buttwelded pipe fittings and forged flanges.
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