ASME B16.9 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.
Stand concentric reducer is a kind of fitting that be used for reducing piping size. Concentric reducer is most commonly used and often eccentric reducer used in piping in about pump and pipe rack area. standards: ANSI – B 16.9
ASTM A403 – ASME SA403 – ‘Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings’
API 590-605
ASME B16.9 – ‘Factory-Made Wrought Buttwelding Fittings’
ASME B16.25 – ‘Buttwelding Ends’
ASME B16.28 – ‘Wrought Steel Buttwelding Short Radius Elbows and Returns’
MSS SP-43 – ‘Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications’
Schedule: Sch 5 TO Sch XXS.
Thickness: Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS and etc.
| Nominal Pipe Size | Outside diameter at bevel |
Center-to-End | |||
|---|---|---|---|---|---|
| Run | Outlet | Run | Outlet | Run (C) | Outlet (M) |
| 1/2″ | 1/4″ 3/8″ |
21.3 | 13.7 17.3 |
25 | 25 |
| 3/4″ | 3/8″ 1/2″ |
26.7 | 17.3 21.3 |
29 | 29 |
| 1″ | 1/2″ 3/4″ |
33.4 | 21.3 26.7 |
38 | 38 |
| 1 1/4″ | 1/2″ 3/4″ 1″ |
42.2 | 21.3 26.7 33.4 |
48 | 48 |
| 1 1/2″ | 1/2″ 3/4″ 1″ 1 1/4″ |
48.3 | 21.3 26.7 33.4 42.2 |
57 | 57 |
| 2″ | 3/4″ 1″ 1 1/4″ 1 1/2″ |
60.3 | 26.7 33.4 42.2 48.3 |
64 | 44 51 57 60 |
| 2 1/2″ | 1″ 1 1/4″ 1 1/2″ 2″ |
73.0 | 33.4 42.2 48.3 60.3 |
76 | 57 64 67 70 |
| 3″ | 1 1/4″ 1 1/2″ 2″ 2 1/2″ |
88.9 | 42.2 48.3 60.3 73.0 |
86 | 70 73 76 83 |
| 3 1/2″ | 1 1/2″ 2″ 2 1/2″ 3″ |
101.6 | 48.3 60.3 73.0 88.9 |
95 | 79 83 89 92 |
| 4″ | 1 1/2″ 2″ 2 1/2″ 3″ 3 1/2″ |
114.3 | 48.3 60.3 73.0 88.9 101.6 |
105 | 86 89 95 98 102 |
| 5″ | 2″ 2 1/2″ 3″ 3 1/2″ 4″ |
141.3 | 60.3 73.0 88.9 101.6 114.3 |
124 | 105 108 111 114 117 |
| 6″ | 2 1/2″ 3″ 3 1/2″ 4″ 5 |
168.3 | 73.0 88.9 101.6 114.3 141.3 |
143 | 121 124 127 130 137 |
| 8″ | 3 1/2″ 4″ 5″ 6″ |
219.1 | 101.6 114.3 141.3 168.3 |
178 | 152 156 162 168 |
| 10″ | 4″ 5″ 6″ 8″ |
273.0 | 114.3 141.3 168.3 219.1 |
216 | 184 191 194 203 |
| 12″ | 5″ 6″ 8″ 10″ |
323.8 | 141.3 168.3 219.1 273.0 |
254 | 216 219 229 241 |
| 14″ | 6″ 8″ 10″ 12″ |
355.6 | 168.3 219.1 273.0 323.8 |
279 | 238 248 257 270 |
| 16″ | 6″ 8″ 10″ 12″ 14″ |
406.4 | 168.3 219.1 273.0 323.8 355.6 |
305 | 264 273 283 295 305 |
| 18″ | 8″ 10″ 12″ 14″ 16″ |
457.0 | 219.1 273.0 323.8 355.6 406.4 |
343 | 298 308 321 330 330 |
| 20″ | 8″ 10″ 12″ 14″ 16″ 18″ |
508.0 | 219.1 273.0 323.8 355.6 406.4 457.0 |
381 | 324 333 346 356 356 368 |
| 22″ | 10″ 12″ 14″ 16″ 18″ 20″ |
559.0 | 273.0 323.8 355.6 406.4 457.0 508.0 |
419 | 359 371 381 381 394 406 |
| 24″ | 10″ 12″ 14″ 16″ 18″ 20″ 22″ |
610.0 | 273.0 323.8 355.6 406.4 457.0 508.0 559.0 |
432 | 384 397 406 406 419 432 432 |
The dimensions are in millimeters
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