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Alloy Steel Orifice Flanges are forged flanges with pressure tap holes drilled. A matched pair consists of an orifice plate in the pipeline and the pressure drop across the plate measures the flow. The differential pressure is transmitted from the taps to the measurement point by precision-machined taps. The components are manufactured in accordance with ASME B16.36 to meet the requirements of severe pressure and temperature applications and available in chrome-moly grades F5, F9, F11, F12, F22 and F91 that conform to ASTM A182. They are extensively used in refineries and power generation facilities on steam and hot hydrocarbon lines. Solitaire Overseas provides these flanges with certificates to EN 10204 3.1 and material traceability testing for all domestic and export orders.
| Parameter | Specification |
|---|---|
|
Specifications |
ASTM A182 / ASME SA182 |
|
Dimensions |
ASME B16.36 (orifice flanges); base flange dimensions per ASME B16.5 |
|
Size Range |
Standard range per class per ASME B16.36 (larger sizes custom drawing items) |
|
Pressure Class |
Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500 (Class 150 available under B16.5 with custom taps upon request) |
|
Flange Face Type |
Raised Face (RF), Ring-Type Joint (RTJ) |
|
Flange Types |
Weld Neck (standard across all classes), Slip On (lower pressure classes per B16.36) |
|
Pressure Taps |
Standard flange taps (1/2" NPT female); size, orientation, and connection specified on order |
|
Jack Screws |
Heavy-duty jack screws and nuts (supplied on request) |
|
Orifice Plate |
Sized and supplied separately per flow calculation parameters |
|
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 |
Not specified |
|
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 |
| Material Group | Common Name | Type | UNS | Forging Spec | DIN Designation | DIN Werkstoff Nr. |
|---|---|---|---|---|---|---|
|
Low Alloy Steel |
Mo steel |
C 0.5Mo |
K12822 |
ASTM A182 F1 Cl 2 |
15Mo3 |
1.5415 |
|
Alloy Steel |
Chrome Moly |
1.25Cr 0.5Mo |
K11597 |
ASTM A182 F11 Cl 2 |
13CrMo44 |
1.7335 |
|
Alloy Steel |
Chrome Moly |
1Cr 0.5Mo |
K11562 |
ASTM A182 F12 Cl 2 |
15CrMo3 |
1.7337 |
|
Alloy Steel |
Chrome Moly |
2.25Cr 1Mo |
K21590 |
ASTM A182 F22 Cl 3 |
10CrMo910 |
1.7380 |
|
Alloy Steel |
Chrome Moly |
5Cr 0.5Mo |
K41545 |
ASTM A182 F5 / F5a |
12CrMo195 |
1.7362 |
|
Alloy Steel |
Chrome Moly |
9Cr 1Mo |
K90941 |
ASTM A182 F9 |
X12CrMo9-1 |
1.7386 |
|
Alloy Steel |
Chrome Moly |
9Cr 1Mo V |
K90901 |
ASTM A182 F91 |
X10CrMoVNb9-1 |
1.4903 |
| 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 (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 |
| NPS | Class | Outside Diameter (O) | Flange Thickness (C) | Length Through Hub (Y) | Bolt Circle (K) | Number of Bolts | Diameter of Bolt Holes | Tap Size (NPT) |
|---|---|---|---|---|---|---|---|---|
|
1" |
300 |
124.0 mm |
38.1 mm |
82.6 mm |
88.9 mm |
4 |
19.1 mm |
1/2" |
|
2" |
300 |
165.0 mm |
38.1 mm |
98.4 mm |
127.0 mm |
8 |
19.1 mm |
1/2" |
|
3" |
300 |
210.0 mm |
42.9 mm |
104.8 mm |
168.3 mm |
8 |
22.2 mm |
1/2" |
|
4" |
300 |
254.0 mm |
47.6 mm |
111.1 mm |
200.0 mm |
8 |
22.2 mm |
1/2" |
|
2" |
600 |
165.0 mm |
38.1 mm |
98.4 mm |
127.0 mm |
8 |
19.1 mm |
1/2" |
|
3" |
600 |
210.0 mm |
42.9 mm |
104.8 mm |
168.3 mm |
8 |
22.2 mm |
1/2" |
|
4" |
600 |
273.0 mm |
47.6 mm |
114.3 mm |
215.9 mm |
8 |
25.4 mm |
1/2" |
| Pressure Class | Approximate Working Pressure (psig) | Approximate Working Pressure (bar) |
|---|---|---|
|
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 |
Forged flanges in ASTM A182 chrome moly grades with drilled pressure tap holes. A pair holds an orifice plate so differential pressure can measure flow.
An orifice plate restricts fluid flow, creating a pressure drop. Pressure taps in the flanges transmit this differential pressure to a meter or transmitter for flow measurement.
ASME B16.36 specifies the dimensions, pressure tap configurations, tolerances, and pressure ratings of orifice flanges from Class 300 to Class 2500.
Jack screws push the flanges apart so the orifice plate can be removed, inspected or replaced without damaging the gasket faces. They are supplied on request.
Standard flange taps are positioned approximately 1 inch (25.4 mm) upstream and 1 inch downstream from the respective faces of the orifice plate.
It carries drilled tap holes, often jack screws, and is supplied as a matched pair. A standard B16.5 flange has none of these.
F11 and F22 suit steam and refinery lines. The operating temperature, pressure and design code decide the grade, and it should match the pipe.
Give NPS, class, grade, type, bore and schedule, tap size and orientation, jack screws, face type, quantity and certificates such as EN 10204 3.1.