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Alloy steel swivel ring flanges are made for facilitating easier connections in pipeline applications where precise bolt hole alignment is challenging during installation. A forged weld neck hub is then welded to the pipe while the forged ring with bolt holes rotates around it. Since the ring rotates, the alignment of the bolt holes becomes easier without rotating the pipe itself. This type of flange is very convenient for offshore installations and subsea pipeline connections due to the possibility of difficult alignment. They are available in grades of ASTM A182 F5, F9, F11, F22, and F91 and can be used in alloy steel piping installations. Solitaire Overseas supplies them with EN 10204 3.1 certificates and complete material traceability.
| Parameter | Detail |
|---|---|
|
Product |
Alloy steel swivel ring flange (SRF, rotating flange), hub and rotating ring assembly |
|
Material Grades |
ASTM A182 F5, F9, F11 Cl.2/Cl.3, F22 Cl.3, F91 (F1 and F12 available on request) |
|
Construction |
Forged weld neck hub with shoulder, rotating forged outer ring, heavy retaining ring |
|
Dimensional Basis |
Bolting pattern and ring outer dimensions conform to ASME B16.5 / B16.47; special sizes to drawing |
|
Pressure Class |
Class 150, 300, 600, 900, 1500, and 2500 (ratings validated by engineering calculation). Classes apply to the bolting pattern. Take temperature ratings from the design calculation |
|
Face Type |
Raised Face (RF), Ring Type Joint (RTJ) |
|
Heat Treatment |
Annealed, or normalised and tempered, per the ASTM A182 grade. Confirm whether quenched and tempered is allowed for each grade before stating it |
|
Testing |
Chemical analysis, mechanical tensile/yield/impact, hardness, PMI, UT, and MPI |
|
Documentation |
EN 10204 3.1 Mill Test Certificate (MTC), EN 10204 3.2 TPI available on request |
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) max | Sulfur (S) max | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Other Elements |
|---|---|---|---|---|---|---|---|---|
|
A182 F5 |
0.15 max |
0.30 to 0.60 |
0.030 |
0.030 |
0.50 max |
4.00 to 6.00 |
0.44 to 0.65 |
Not specified |
|
A182 F9 |
0.15 max |
0.30 to 0.60 |
0.030 |
0.030 |
0.50 to 1.00 |
8.00 to 10.00 |
0.90 to 1.10 |
Not specified |
|
A182 F11 Cl.2 |
0.10 to 0.20 |
0.30 to 0.80 |
0.040 |
0.040 |
0.50 to 1.00 |
1.00 to 1.50 |
0.44 to 0.65 |
Not specified |
|
A182 F22 Cl.3 |
0.05 to 0.15 |
0.30 to 0.60 |
0.040 |
0.040 |
0.50 max |
2.00 to 2.50 |
0.87 to 1.13 |
Not specified |
|
A182 F91 |
0.08 to 0.12 |
0.30 to 0.60 |
0.020 |
0.010 |
0.20 to 0.50 |
8.00 to 9.50 |
0.85 to 1.05 |
V: 0.18 to 0.25, Nb: 0.06 to 0.10, N: 0.03 to 0.07 |
| Grade | Tensile Strength min, MPa (ksi) | Yield Strength min, MPa (ksi) | Elongation min, % | Reduction of Area min, % | Hardness, HBW |
|---|---|---|---|---|---|
|
A182 F5 |
485 (70) |
275 (40) |
20 |
35 |
217 max |
|
A182 F9 |
585 (85) |
380 (55) |
20 |
40 |
179 to 217 |
|
A182 F11 Cl.2 |
485 (70) |
275 (40) |
20 |
30 |
143 to 207 |
|
A182 F11 Cl.3 |
515 (75) |
310 (45) |
20 |
30 |
156 to 207 |
|
A182 F22 Cl.3 |
515 (75) |
310 (45) |
20 |
30 |
156 to 207 |
|
A182 F91 |
585 (85) |
415 (60) |
20 |
40 |
190 to 248 |
| Pressure Class | Working Pressure (bar) | Working Pressure (psi) | Hydrostatic Test Pressure (bar) |
|---|---|---|---|
|
Class 150 |
20.0 |
290 |
30.0 |
|
Class 300 |
51.7 |
750 |
77.5 |
|
Class 600 |
103.4 |
1,500 |
155.1 |
|
Class 900 |
155.1 |
2,250 |
232.7 |
|
Class 1500 |
258.6 |
3,750 |
387.8 |
|
Class 2500 |
430.9 |
6,250 |
646.4 |
| Feature / Parameter | Size Range (NPS) | Tolerance (mm) |
|---|---|---|
|
Outside Diameter |
NPS 24 |
1.6 mm |
|
NPS > 24 |
3.2 mm |
|
|
Inside Diameter (Bore) |
Threaded & Slip-On |
+1.6mm/-0mm |
|
Socket Weld & Weld Neck (NPS 10 and smaller) |
0.8mm |
|
|
Socket Weld & Weld Neck (NPS 12 to 18) |
1.6mm |
|
|
Socket Weld & Weld Neck (NPS 20) |
+3.2mm/-1.6mm |
|
|
Diameter of Contact Face |
1.6 mm Raised Face |
0.8mm |
|
6.35 mm Raised Face, Male-Female, Tongue & Groove |
0.4mm |
|
|
Outside Diameter of Hub |
NPS 12 |
+2.4mm/-1.6mm |
|
NPS 14 |
+3.2mm/-1.6mm |
|
|
Drilling & Bolt Holes |
Bolt Circle Diameter (PCD) |
1.6mm |
|
Bolt Hole Spacing (Adjacent Holes) |
0.8mm |
|
|
Eccentricity of Bolt Circle |
NPS 2-1/2 |
0.8 mm max (with respect to facing) |
|
NPS 3 |
1.6 mm max (with respect to facing) |
|
|
Flange Thickness |
NPS 18 |
+3.2mm/-0mm |
|
NPS 20 |
+4.8mm/-0mm |
|
|
Length Through Hub |
NPS 18 |
+3.2mm/-0.8mm |
|
NPS 20 |
+4.8mm/-1.6mm |
Alloy steel swivel ring flanges are two-piece components with a forged hub and a separate rotating bolt ring for easy flange alignment.
The main components are a forged hub, a rotating outer ring, a retaining shoulder and a gasket-facing surface.
Both rotate. A lap joint flange sits loose on a welded stub end. A swivel ring is a hub and ring set designed for higher loads and offshore use.
Choose alloy when the pipe is alloy and the line runs hot, so the hub welds to matching material. For ambient service, carbon steel is usually enough.
Give the hub and ring grade, size, class, face type, design pressure and temperature, retainer details, quantity and certificates. A drawing helps.