The tolerance for butt welding pipe fittings ASME B16.9

ASME B16.9 is the standard for factory-made wrought butt-welding pipe fittings in sizes 1/2" through 48". Fluido provides all kinds of butt welding pipe fittings in both carbon steel and stainless steel material. The tolerances for ASME B16.9 butt welding pipe fittings are as below:

b) Tolerances are equal plus and minus except as noted. a) All dimensions are in mm.

Notes:

1) The inside diameter and the nominal wall thicknesses at the ends are to be specified by the purchaser.

2) A minimum wall thickness of 87.5% applies unless the purchaser specifies a different wall thickness tolerance.

3) Out-of-round is the sum of absolute values of plus and minus tolerances.

4) This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet the design requirements of ASME B16.9 para 2.2

5) Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.

ASME B16.9 is a standard issued by the American Society of Mechanical Engineers (ASME) for the design and manufacturing of pipe fittings. This standard specifies requirements for dimensions, materials, manufacturing methods, interface forms, etc., and covers overall dimensions tolerances ratings testing and markings for factory-made wrought, aimed at ensuring the safety, reliability, and interchangeability of pipeline systems.

ASME B16.9 standard applies to various types of factory-made wrought buttwelding fittings, including elbows, tees, reducers, and caps. It stipulates the fittings in sizes NPS 1 2 through NPS 48 dn 15 through dn 1200 size range, wall thickness, connection methods, tolerance requirements, as well as relevant inspection and testing methods for pipe fittings. These provisions not only assist manufacturers in correctly designing and manufacturing pipe fittings but also help users in selecting and installing pipe fittings properly to ensure the normal operation of pipeline systems.

ASME B16.9 standard is widely used in pipeline engineering in industries such as petroleum, chemical, power, papermaking, and food, serving as an important reference for pipeline design and manufacturing. By following this standard, the quality and safety of pipeline systems can be enhanced, the risk of accidents reduced, and the smooth progress of production and operation ensured. Therefore, understanding and complying with the ASME B16.9 standard is crucial for personnel involved in pipeline engineering.

check the dimension and material information for butt welding pipe fittings

ASME B16.49-2007 Factory-Made,Wrought Steel, Buttwelding Induction Bends for Transportation and 

ASME-B16.9-2007 Factory-Made Wrought Butt Welding Fitting

DIN2617-1991 Steel butt-welding pipe fittings

JIS G3452 SGP 1997  Steel Butt-welding pipe fittings for ordinary use

Weight for butt welding pipe fitting

Tolerances for ASME DIN JIS MSS Butt Welding Pipe Fittings

Wall Thickness Schedules (ASME B36.10 B36.19)

Production process of butt welding tee

The wall thickness and weight for steel pipe and butt welding pipe fitting

The Welding Bevels for the butt welding pipe fitting