ASME B16.47 Series B · ASTM A105 · stock and made to order
30″ Class 900 Weld Neck Flange — ASME B16.47 Series B
30″ Class 900 weld neck flange to ASME B16.47 Series B, machined from ASTM A105. Outside diameter 1181 mm, thickness 155.4 mm, 20 bolt holes on a 1035 mm circle, approximate weight 826 kg. Available with raised face, flat face or the facing specified on your drawing.
Size
30″ / DN750
Standard
ASME B16.47 Series B (ASME B16.47-2025, Series B)
Pressure rating
Class 900
Outside diameter
1181 mm (46.5″)
Thickness
155.4 mm (6.12″)
Bolt circle
1035 mm (40.75″)
Approx. weight
826 kg
Full dimensions — 30″ Class 900
| Size | DN | OD | Thickness | RF Ø | Bolt circle | Bolts | Hub Ø | Length | Weight | |
|---|---|---|---|---|---|---|---|---|---|---|
| 26″ | 650 | 1022 mm (40.24″) | 134.9 mm (5.31″) | 762 mm (30″) | 901.7 mm (35.5″) | 20 × Ø66.7 mm (2.63″) | 743 mm (29.25″) | 259 mm (10.2″) | 476 kg | Details → |
| 28″ | 700 | 1105 mm (43.5″) | 147.6 mm (5.81″) | 819 mm (32.24″) | 971.6 mm (38.25″) | 20 × Ø73 mm (2.87″) | 797 mm (31.38″) | 276 mm (10.87″) | 689 kg | Details → |
| 30″ (this size) | 750 | 1181 mm (46.5″) | 155.4 mm (6.12″) | 876 mm (34.49″) | 1035 mm (40.75″) | 20 × Ø79.4 mm (3.13″) | 851 mm (33.5″) | 289 mm (11.38″) | 826 kg | Details → |
| 32″ | 800 | 1238 mm (48.74″) | 160.3 mm (6.31″) | 927 mm (36.5″) | 1092.2 mm (43″) | 20 × Ø79.4 mm (3.13″) | 908 mm (35.75″) | 303 mm (11.93″) | 937 kg | Details → |
| 34″ | 850 | 1314 mm (51.73″) | 171.5 mm (6.75″) | 991 mm (39.02″) | 1155.7 mm (45.5″) | 20 × Ø85.7 mm (3.37″) | 962 mm (37.87″) | 319 mm (12.56″) | 1111 kg | Details → |
| 36″ | 900 | 1346 mm (52.99″) | 173 mm (6.81″) | 1029 mm (40.51″) | 1200.2 mm (47.25″) | 24 × Ø79.4 mm (3.13″) | 1016 mm (40″) | 325 mm (12.8″) | 1143 kg | Details → |
| 38″ | 950 | 1460 mm (57.48″) | 190.5 mm (7.5″) | 1099 mm (43.27″) | 1289 mm (50.75″) | 20 × Ø92.1 mm (3.63″) | 1073 mm (42.24″) | 353 mm (13.9″) | — | Details → |
| 40″ | 1000 | 1511 mm (59.49″) | 196.9 mm (7.75″) | 1162 mm (45.75″) | 1339.8 mm (52.75″) | 24 × Ø92.1 mm (3.63″) | 1127 mm (44.37″) | 363 mm (14.29″) | — | Details → |
| 42″ | 1050 | 1562 mm (61.5″) | 206.2 mm (8.12″) | 1213 mm (47.76″) | 1390.6 mm (54.75″) | 24 × Ø92.1 mm (3.63″) | 1176 mm (46.3″) | 371 mm (14.61″) | — | Details → |
| 44″ | 1100 | 1648 mm (64.88″) | 214.3 mm (8.44″) | 1270 mm (50″) | 1463.5 mm (57.62″) | 24 × Ø98.4 mm (3.87″) | 1235 mm (48.62″) | 391 mm (15.39″) | — | Details → |
| 46″ | 1150 | 1734 mm (68.27″) | 225.6 mm (8.88″) | 1334 mm (52.52″) | 1536.7 mm (60.5″) | 24 × Ø104.8 mm (4.13″) | 1292 mm (50.87″) | 411 mm (16.18″) | — | Details → |
| 48″ | 1200 | 1784 mm (70.24″) | 233.4 mm (9.19″) | 1384 mm (54.49″) | 1587.5 mm (62.5″) | 24 × Ø104.8 mm (4.13″) | 1343 mm (52.87″) | 419 mm (16.5″) | — | Details → |
Published ASME B16.47 Series B dimensions for every Class 900 size in this product family.
Dimensions in millimetres; the inch equivalent is shown in brackets. Bolt hole diameter applies to through-holes. For stud length, gasket and bolting selection, match the gasket and bolts to B16.47 B.
What Class 900 means in service
Series B follows the former API 605 dimensions, with a smaller outside diameter and a different bolt pattern from Series A. Ratings are ASME classes 150, 300, 400, 600 and 900, with allowable pressure from the B16.47 tables.
Series B follows the former API 605 dimensions, with a smaller outside diameter and a different bolt pattern from Series A. Ratings are ASME classes 150, 300, 400, 600 and 900, with allowable pressure from the B16.47 tables.
Facing and materials
Raised face (RF) is standard: 1.5 mm high for Classes 75, 150 and 300; 6.4 mm for Classes 400, 600 and 900. FF and RTJ faces are available to drawing.
- ASTM A105 / A105N
- ASTM A350 LF2
- ASTM A182 F304/F316L
- ASTM A694 F52/F60/F65
- ASTM A182 F51/F53
Other grades, impact-tested heats and NACE MR0175 requirements are quoted on request. Material certificates to EN 10204 3.1 are issued against the same heat number as the dimensional report.
Inspection and delivery
- Dimensional inspection against the B16.47 B table for 30″ Class 900
- Heat number stamped on the rim; EN 10204 3.1 certificate issued
- PMI on stainless and alloy heats; UT/RT on request
- Anti-rust oil, plywood case or pallet, with packing list and MTC
- Typical lead time 7–15 days for carbon steel stock sizes, 20–30 days for alloys
Other sizes in Class 900
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30″ Class 900 Weld Neck Flange
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