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Alloy steel lap joint flange is a loose ring flange type which can be used to slide the flange over a separate stub end welded to the pipe. Stub end face serves as a gasket seating surface, the backing flange will take the load of the bolts and rotate freely to make bolt hole alignment easier to install. These flanges are made of ASTM A182 chrome-moly grades F5, F9, F11, F12, F22 and F91, and are dimensioned and rated in accordance with ASME B16.5. They are also designed so that they can be easily removed and reused for piping systems that need to be taken apart, inspected and cleaned regularly. Solitaire Overseas provides alloy steel lap joint flanges Certified by EN 10204 3.1 and material traceability test for domestic and overseas projects.
| Parameter | Specification |
|---|---|
|
Specifications |
ASTM A182 / ASME SA182 |
|
Dimensions |
ASME B16.5 |
|
Size Range |
NPS 1/2" to 24" in lower classes (confirm limit per class in ASME B16.5; larger sizes are custom drawing items) |
|
Pressure Class |
Class 150, Class 300, Class 600, Class 900, Class 1500; Class 2500 up to NPS 12 (confirm in ASME B16.5) |
|
Flange Face Type |
Raised Face (RF) on the flange bore seating face; gasket seals directly on the matching stub end lap face |
|
Stub End Fitting |
Manufactured to MSS SP-43 or ASME B16.9 (supplied separately to match pipe schedule and material) |
|
Documentation |
EN 10204 3.1 MTC, 3.2 third-party inspection available on request |
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) Max | Sulfur (S) Max | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Other Elements |
|---|---|---|---|---|---|---|---|---|
|
ASTM A182 F1 |
0.28 max |
0.60 to 0.90 |
0.045 |
0.045 |
0.15 to 0.35 |
Not specified |
0.44 to 0.65 |
Not specified |
|
ASTM 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 |
Ni 0.50 max |
|
ASTM 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 |
Ni 0.50 max |
|
ASTM 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 |
|
ASTM A182 F12 Cl 2 |
0.10 to 0.20 |
0.30 to 0.80 |
0.040 |
0.040 |
0.10 to 0.60 |
0.80 to 1.25 |
0.44 to 0.65 |
Not specified |
|
ASTM 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 |
|
ASTM 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 & Class | Tensile Strength, Min MPa (ksi) | Yield Strength, Min MPa (ksi) | Elongation in 2 in. (50 mm), Min (%) | Reduction of Area, Min (%) | Brinell Hardness Range (HBW) |
|---|---|---|---|---|---|
|
ASTM A182 F1 |
415 (60) |
205 (30) |
20 |
40 |
121 – 174 |
|
ASTM A182 F5 |
485 (70) |
275 (40) |
20 |
35 |
143 – 217 |
|
ASTM A182 F9 |
585 (85) |
380 (55) |
20 |
40 |
179 – 217 |
|
ASTM A182 F11 Class 2 |
485 (70) |
275 (40) |
20 |
30 |
143 – 207 |
|
ASTM A182 F11 Class 3 |
515 (75) |
310 (45) |
20 |
30 |
156 – 207 |
|
ASTM A182 F12 Class 2 |
485 (70) |
275 (40) |
20 |
30 |
143 – 207 |
|
ASTM A182 F22 Class 3 |
515 (75) |
310 (45) |
20 |
30 |
156 – 207 |
|
ASTM A182 F91 |
585 (85) |
415 (60) |
20 |
40 |
190 – 248 |
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
|
ASTM A182 F1 |
1.5415 |
K12822 |
|
ASTM A182 F5 |
1.7362 |
K41545 |
|
ASTM A182 F9 |
1.7386 |
K90941 |
|
ASTM A182 F11 Class 2 |
1.7335 |
K11597 |
|
ASTM A182 F12 Class 2 |
1.7337 |
K11562 |
|
ASTM A182 F22 Class 3 |
1.7380 |
K21590 |
|
ASTM A182 F91 |
1.4903 |
K90901 |
| Pressure Class | Maximum Working Pressure (psig) | Maximum Working Pressure (bar) |
|---|---|---|
|
Class 150 |
290 |
20.0 |
|
Class 300 |
750 |
51.7 |
|
Class 600 |
1500 |
103.4 |
|
Class 900 |
2250 |
155.1 |
|
Class 1500 |
3750 |
258.6 |
|
Class 2500 |
6250 |
430.9 |
| NPS | Outside Diameter (O) | Flange Thickness (C) | Lapped Bore (B) | Length Through Hub (Y) | Bolt Circle (K) | Number of Bolts | Diameter of Bolt Holes |
|---|---|---|---|---|---|---|---|
|
1/2" |
89 mm |
11.2 mm |
22.9 mm |
16 mm |
60.3 mm |
4 |
15.9 mm |
|
1" |
108 mm |
14.3 mm |
35.1 mm |
17 mm |
79.4 mm |
4 |
15.9 mm |
|
2" |
152 mm |
19.1 mm |
62.0 mm |
25 mm |
120.7 mm |
4 |
19.1 mm |
|
3" |
190 mm |
23.9 mm |
91.4 mm |
30 mm |
152.4 mm |
4 |
19.1 mm |
|
4" |
229 mm |
23.9 mm |
116.8 mm |
33 mm |
190.5 mm |
8 |
19.1 mm |
|
6" |
279 mm |
25.4 mm |
170.7 mm |
40 mm |
241.3 mm |
8 |
22.2 mm |
|
8" |
343 mm |
28.6 mm |
221.5 mm |
44 mm |
298.5 mm |
8 |
22.2 mm |
Loose flanges in ASTM A182 chrome moly grades that slide over a welded stub end. They rotate freely, so bolt holes line up easily.
A short fitting with a flared lap, butt welded to the pipe. Its lap face holds the gasket while the loose flange bolts behind it.
Not on the gasket path, since the stub end face carries the gasket. A lower grade flange may be allowed, but check the design code and crevice risk.
A lap joint flange rotates freely on a separate stub end. A slip on flange is welded directly to the pipe with two fillet welds.
ASME B16.5 lapped flanges cover small to medium sizes across the classes. Larger sizes are custom drawing items. Confirm the size limit for each class.
Match the stub end to the pipe, for example WP11 with F11 pipe or WP22 with F22 pipe. The loose flange grade follows the bolting load and code.
Avoid it in high pressure, severe cyclic, bending and high temperature steam service. The loose design carries less load than a weld neck flange.
Give NPS, class, flange grade, stub end type and grade, pipe schedule, face type, quantity and certificates such as EN 10204 3.1.