ANSI B16.9/B16.28 Butt weld fittings Butt weld returns

Butt weld fittings are the most common type of steel fittings used for pipelines above 2 inches of diameter. They are used to change the pathway of the pipeline (elbows), reduce / increase its flow size (reducers), branch (tees, cross) or close it (cap), and are connected to pipes by welding. Butt welding fittings are available in multiple shapes as elbows, tees, reducers, crosses, etc and in a wide range of diameters (from 1/2 to 48 inches), schedules (5/5s, 10/10s, 40/40s, 80/80s, XS/XH, XXS, 160, etc) and material grades (the most common are ASTM A234 WPB for carbon steel and ASTM A403 WP 304 to 316 for stainless steel wrought fittings). BW fittings are available in seamless and wekded execution (respectively < 24 / > 24 inch)

Carbon steel fittings are widely used for linepipes and piping systems in the oil & gas and petrochemical industries, whereas stainless steel buttweld fittings find extensive application in processes subject to corrosion and erosion (and are also common within the pharmaceutical and food sectors). The material of the pipe shall generally match the material of the connecting butt welded fittings.

For specific applications, steel fittings are either coated on the outer surface or lined internally.

ANSI / ASME B16.9 – B16.28 This Standard covers overall dimensions, tolerances, ratings, testing, and markings for wrought carbon and alloy steel factory-made buttwelding fittings of NPS 1/2 through 48. It covers fittings of any producible wall thickness. This standard does not cover low pressure corrosion resistant buttwelding fittings. See MSS SP-43, Wrought Stainless Steel Butt-Welding Fittings. Short radius elbows and returns, which were previously included in ASME B16.28-1994, are included in this standard. B16.9 is to be used in conjunction with equipment described in other volumes of the ASME B16 series of standards as well as with other ASME standards, such as the Boiler and Pressure Vessel Code and the B31 Piping Codes”.

features OF WELDED FITTINGS
Welded pipe / fittings connections:

are strong and leak-proof
minimize the pressure drops and the turbolence along the pipeline
have a long service life
The allowable pressure ratings for fittings designed in accordance with the standard ASME B 16.9–1993 may be calculated as for straight seamless pipe in accordance with the rules established in the applicable section of the ASME B 31 codes for pressure piping. Hydrostatic testing of wrought fittings is not required. All fittings shall be capable of withstanding, without leakage, a test pressure equal to that prescribed in the specification for the pipe with which the fitting’s marking identifies.

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Buttweld ASME/ANSI B16.9 Pipe Fittings Available Types