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Flange & Fitting


Standard specifications and technical requirements for various flanges and fittings.

ASME B16.9 Reducer

Technical Drawings The reducers are often used when the piping designers want to reduce the diameter of a straight run of pipe. There are two styles of standard reducers available in ASME B16.9: Concentric – having a common centerline; Eccentric reducer – having offset centerlines. Dimensions *NPS: Nominal Pipe Size; O.D L: Outside Diameter at Bevel, large end; O.D S: …

ASME B16.9 Caps

Technical Drawings The cap is used to seal an open end of the pipe. In piping engineering, the cap made in accordance with ASME B16.9 will be welded to the end and need not be included in the length dimension of the run of pipe. Dimensions *NPS: Nominal Pipe Size; O.D: Outside Diameter at Bevel; E: Length[NOTE(1)]; E1: Limiting Wall …

ASME B16.9 Lap Joint Stub End

Technical Drawings The lap joint stub end is required when attach the lap-joint flange to the piping system. The stub end and lap-joint flange assembly are used mainly in piping systems that necessitate frequent dismantling for inspection or routine maintenance. It is also used in the erection of large diameter or hand-to-adjust piping configurations because of the assembly’s quick bolt …

ASME B16.9 Reducing Tee & Reducing Cross

Technical Drawings The reducing tee or the reducing cross has same function as that of a straight tee or a straight cross, respectively, except that the branch outlet is a smaller pipe size. Dimensions *NPS: Nominal Pipe Size; O.D: Outside Diameter at Bevel. *NPS: Nominal Pipe Size; C: Center-to-End, Run; M: Center-to-End, Outlet. *Click to view dimensions of other ASME …

ASME B16.9 Straight Tee & Cross

Technical Drawings The ASME B16.9 straight tee is a three-way fitting used to make perpendicular connections to a pipe. Its name comes from its resemblance to the letter T. The ASME B16.9 straight cross is a four-way fitting used to make double perpendicular connections to the pipe. It resembles a crossroad. Lines that connect to the main run of pipe …

ASME B16.9 3D Radius Elbows

Technical Drawings According to ASME B16.9-2018, the standard 3D radius elbow may be furnished in 45° or 90°. Compared to the long radius elbow, its center-to-end dimension is much larger, which is double the length of a corresponding L/R elbow. The center-to-end dimension can be calculated as “3 x NPS” in inch unit. Thus, it provides much smoother flow characteristics. …

ASME B16.9 S/R Returns

Technical Drawings The short-radius (S/R) 180° return of ASME B16.9 has the same function as that of a L/R return except that it makes a much shaper turn than does the L/R return. Dimensions *NPS: Nominal Pipe Size; O.D: Outside Diameter at Bevel; O: Center-to-Center; K: Back-to-face. Note: (1) Dimension A is equal to one-half of dimension O. *Click to …

ASME B16.9 L/R Returns

Technical Drawings The long-radius (L/R) 180° returns manufactured in accordance of ASME B16.9 can convert the fluid flow to the parallel but opposite direction. It looks like a half-cut of a circular ring. Usually, the L/R return is also called “180° L/R bend”. Dimensions *NPS: Nominal Pipe Size; O.D: Outside Diameter at Bevel; O: Center-to-Center; K: Back-to-face. *Click to view …

ASME B16.9 S/R Elbows

Technical Drawings The standard short-radius(S/R) elbows of ASME B16.9 are generally furnished in 90°. It makes a much sharper turn than does the long radius elbows. The center-to-end dimension is 1D radius which equals to 1 x NPS in inch unit. Conversely, the S/R elbow creates a rather large pressure drop inside the line and dose not have the smooth …

ASME B16.9 L/R Reducing Elbows

Technical Drawings The ASME B16.9 reducing elbows, usually furnished in long radius(L/R) style, not only change the piping direction by 90 degrees but also connect two piping with different outside diameters. Dimensions *NPS: Nominal Pipe Size; O.D L: Outside Diameter at Bevel, large end; O.D S: Outside Diameter at Bevel, small end; A: Center-to-End. *Click to view dimensions of other …

ASME B16.9 L/R Elbows

Technical Drawings The ASME B16.9 elbow is used when a pipe changes direction. Elbows can turn up, turn down, turn left, right, or any angle in between. The long radius (L/R) elbows denote elbows with the center-to-end dimension of 1.5D radius which equals to 1.5 x NPS in inch unit. The standard long radius elbows of ASME B16.9 can be …

ASME B16.9 Butt Welding Fittings

Scope, Codes & Pressure Ratings The ASME B16.9 standard covers all dimensions, tolerances, ratings, testing, and marking for factory-made wrought butt-welding fittings in sizes NPS 1/2 through NPS 48 [DN 15 through DN 1200]. It also covers pipe fittings made to special dimensions, sizes, shapes, and tolerances by agreement between the manufacturer and the purchaser. Fabricated laterals, saddles, and other …

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