ASME B16.11 Forged Fittings Specification
ASME B16.11 covers ratings, dimensions, tolerances, marking and material requirements for socket-welding and threaded forged fittings. These fittings are designated as Class 2000, 3000, and 6000 for threaded end fittings and Class 3000, 6000, and 9000 for socket-weld end fittings.
B16.11 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.
Socket welding (SW) is used for welding pipes and fittings including reducers, tees and elbows.
Socket weld pipe fittings are used to permanently join pipes that are inserted into a recess in the fitting, flange or valve. Once correctly inserted, fillet type sealing welds are applied to join the pipe to the fitting.
These fittings are commonly known as SW pipe fittings, with SW couplings, SW elbows and SW tees being examples of different types.
Thread pipe fitting refers to the pipe fittings with Thread end.
NPT thread Pipe fittings
The NPT (National Pipe Thread) thread is a tapered thread used primarily in the United States. It is used for pipe fittings, hydraulic fittings and pneumatic fittings. The NPT thread is characterized by its 60-degree tapered angle and size indicated in inches. Here is a correspondence table for NPT fittings, with male and female diameters in millimeters:
Pressure
Fittings under this Standard shall be designated as
Class 2000, 3000, and 6000 for threaded end fittings and
Class 3000, 6000, and 9000 for socket-weld end fittings
Diameters
For lines from 1/8 to 4 ”diameter.
Connections
NPT (ANSI ASME B1.20.1), BSP, BSPT or Cylindrical GAS (DIN 259, ISO7 / 1, 228-1 10226-1), SW (ANSI ASME B16.11); BWASME B16.25, SW OD, Flanged ASME B16.5 – RF / RTJ – API 6A / 6BX, Mixed.
Materials
Carbon steel, Stainless steel 04、304L，316 / 316L Duplex, Superduplex, Hastelloy, Monel,
Finishes
Black, Zinc Plated, Galvanized, Passivated
Schedule
SCH10, SCH80, SCH160, SCHXXS.
Types of FITTINGS ASME B16.11 3000, 6000 y 9000 PSI
- 90º ELBOW FEMALE-FEMALE OR MALE-FEMALE
- 45º ELBOW
- TEE
- CROSS
- COUPLING AND HALF COUPLING, NORMAL O REDUCED
- MALE PLUG (Hex, Square or Round Head)
- FEMALE CAP OR CAP
- HEX HEAD BUSHING
- FEMALE-MALE REDUCER ADAPTER TYPE
- HEX NIPPLE OR REDUCING HEX NIPPLE
- WELDING BOSS
- UNION NUT OR THREE PIECE UNION (FEMALE-FEMALE OR MALE-FEMALE)
- PIPE ROUND NIPPLES OF SCH TUBE
- SWAGE NIPPLE, TOE, PBE, OR TBE.
- BOSS, COUPLET, REDUCING INSERT, BULL PLUG
- WELD-OULET, SOCKOLET(SOCK-OUTLET), THREADOLET (THREAD-OUTLET), NIPOUTLET, ELBOUTLET
