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SW Flange
SDFL
| Nominal Size | Outer Diameter | Socket Diameter | Flange Ring Height | Flange Overall Height | Bore Diameter | Socket Depth | Weld Groove Diameter | Sealing Face Diameter | Number of Bolt Holes | Bolt Hole Diameter | Central circle diameter | |
| DN | NPS | A | B | C | D | E | K | F | G | I | J | |
| 15 | 1/2 | 120.6 | 15.7 | 22.3 | 31.7 | 22.4 | 9.6 | 38.1 | 35.1 | 4 | 22.3 | 82.6 |
| 20 | 3/4 | 130 | 20.8 | 25.4 | 35 | 27.7 | 11.1 | 44.4 | 42.9 | 4 | 22.3 | 88.9 |
| 25 | 1 | 149.3 | 26.7 | 28.4 | 41.1 | 34.5 | 12.7 | 52.3 | 50.8 | 4 | 25.4 | 101.6 |
| 32 | 1-1/4 | 158.7 | 35.1 | 28.4 | 41.1 | 43.2 | 14.2 | 63.5 | 63.5 | 4 | 25.4 | 111.3 |
| 40 | 1-1/2 | 177.8 | 40.9 | 31.75 | 44.5 | 49.5 | 15.7 | 69.85 | 73.15 | 4 | 28.4 | 124 |
| 50 | 2 | 215.9 | 52.6 | 38.1 | 57.15 | 62 | 17.5 | 104.6 | 91.9 | 8 | 25.4 | 165.1 |
| 65 | 2-1/2 | 244.3 | 62.7 | 41.1 | 63.5 | 74.7 | 19 | 123.9 | 104.6 | 8 | 28.4 | 190.5 |
The ANSI B61.5 1500LB custom SS SW flange delivers heavy-duty pipeline connections for high-pressure industrial systems. Its precision-engineered socket weld (SW) design creates leak-free joints capable of withstanding 1500 psi (10.3 MPa) operating pressure, making it ideal for critical applications. Constructed from 316 stainless steel (1.4401)—enhanced with molybdenum for superior corrosion resistance—it excels in aggressive environments where standard stainless steels fail.
Parameter | Details |
Standard | ANSI B61.5 (equivalent to ASME B16.5 Class 1500) |
Material | Stainless steel 316 (1.4401) |
Pressure Rating | 1500LB (10.3 MPa) |
Dimensions | OD: 121mm, Bolt Circle: 82.6mm, Thickness: 22.5mm |
Bolt Holes | 4x M22 (pitch circle diameter 82.6mm) |
Seal Type | Raised Face (RF, 6.4mm height) |
Temperature Range | -50°C to 600°C |
Socket Weld Reliability: Counter-bored socket design allows full-penetration fillet welding (per ASME BPVC Section IX), eliminating crevice corrosion and reducing stress concentration by 40% .
Advanced Corrosion Resistance: 316 stainless steel’s 2-3% molybdenum content resists chloride pitting in seawater, brine, and chemical processing environments with chloride levels up to 10,000 ppm.
High-Temperature Stability: Maintains tensile strength above 500 MPa at 600°C+, suitable for superheated steam and hot oil transfer systems in refineries.
Custom Engineering: Available with NPT threaded ends or lap joint configurations for seamless integration with mixed ANSI/EN pipeline systems.
Refineries: Connects high-pressure hydrogen lines in catalytic cracking units, with 316 stainless steel resisting sulfuric acid corrosion from process byproducts.
LNG Terminals: Used in cryogenic LNG transfer lines, maintaining ductility at -162°C while preventing methane leakage in storage facilities.
Power Generation: Handles 1500 psi steam in turbine bypass systems, with RF sealing ensuring zero leakage in boiler feedwater circuits.
Q: What welding procedure is recommended for socket welds?
A: Use GTAW (TIG) welding with ER316L filler metal, following ASME BPVC Section IX qualified procedures to ensure weld integrity.
Q: Can this flange connect to metric pipes?
A: Yes, using NPS 1/2 to DN15 transition reducers (ANSI to EN) with compatible pressure ratings to maintain system integrity.
Q: What leak testing methods are suitable?
A: For critical applications, perform helium mass spectrometry testing (ISO 15184) to detect leaks as small as 1x10⁻⁹ mbar·L/s.
| Nominal Size | Outer Diameter | Socket Diameter | Flange Ring Height | Flange Overall Height | Bore Diameter | Socket Depth | Weld Groove Diameter | Sealing Face Diameter | Number of Bolt Holes | Bolt Hole Diameter | Central circle diameter | |
| DN | NPS | A | B | C | D | E | K | F | G | I | J | |
| 15 | 1/2 | 120.6 | 15.7 | 22.3 | 31.7 | 22.4 | 9.6 | 38.1 | 35.1 | 4 | 22.3 | 82.6 |
| 20 | 3/4 | 130 | 20.8 | 25.4 | 35 | 27.7 | 11.1 | 44.4 | 42.9 | 4 | 22.3 | 88.9 |
| 25 | 1 | 149.3 | 26.7 | 28.4 | 41.1 | 34.5 | 12.7 | 52.3 | 50.8 | 4 | 25.4 | 101.6 |
| 32 | 1-1/4 | 158.7 | 35.1 | 28.4 | 41.1 | 43.2 | 14.2 | 63.5 | 63.5 | 4 | 25.4 | 111.3 |
| 40 | 1-1/2 | 177.8 | 40.9 | 31.75 | 44.5 | 49.5 | 15.7 | 69.85 | 73.15 | 4 | 28.4 | 124 |
| 50 | 2 | 215.9 | 52.6 | 38.1 | 57.15 | 62 | 17.5 | 104.6 | 91.9 | 8 | 25.4 | 165.1 |
| 65 | 2-1/2 | 244.3 | 62.7 | 41.1 | 63.5 | 74.7 | 19 | 123.9 | 104.6 | 8 | 28.4 | 190.5 |
The ANSI B61.5 1500LB custom SS SW flange delivers heavy-duty pipeline connections for high-pressure industrial systems. Its precision-engineered socket weld (SW) design creates leak-free joints capable of withstanding 1500 psi (10.3 MPa) operating pressure, making it ideal for critical applications. Constructed from 316 stainless steel (1.4401)—enhanced with molybdenum for superior corrosion resistance—it excels in aggressive environments where standard stainless steels fail.
Parameter | Details |
Standard | ANSI B61.5 (equivalent to ASME B16.5 Class 1500) |
Material | Stainless steel 316 (1.4401) |
Pressure Rating | 1500LB (10.3 MPa) |
Dimensions | OD: 121mm, Bolt Circle: 82.6mm, Thickness: 22.5mm |
Bolt Holes | 4x M22 (pitch circle diameter 82.6mm) |
Seal Type | Raised Face (RF, 6.4mm height) |
Temperature Range | -50°C to 600°C |
Socket Weld Reliability: Counter-bored socket design allows full-penetration fillet welding (per ASME BPVC Section IX), eliminating crevice corrosion and reducing stress concentration by 40% .
Advanced Corrosion Resistance: 316 stainless steel’s 2-3% molybdenum content resists chloride pitting in seawater, brine, and chemical processing environments with chloride levels up to 10,000 ppm.
High-Temperature Stability: Maintains tensile strength above 500 MPa at 600°C+, suitable for superheated steam and hot oil transfer systems in refineries.
Custom Engineering: Available with NPT threaded ends or lap joint configurations for seamless integration with mixed ANSI/EN pipeline systems.
Refineries: Connects high-pressure hydrogen lines in catalytic cracking units, with 316 stainless steel resisting sulfuric acid corrosion from process byproducts.
LNG Terminals: Used in cryogenic LNG transfer lines, maintaining ductility at -162°C while preventing methane leakage in storage facilities.
Power Generation: Handles 1500 psi steam in turbine bypass systems, with RF sealing ensuring zero leakage in boiler feedwater circuits.
Q: What welding procedure is recommended for socket welds?
A: Use GTAW (TIG) welding with ER316L filler metal, following ASME BPVC Section IX qualified procedures to ensure weld integrity.
Q: Can this flange connect to metric pipes?
A: Yes, using NPS 1/2 to DN15 transition reducers (ANSI to EN) with compatible pressure ratings to maintain system integrity.
Q: What leak testing methods are suitable?
A: For critical applications, perform helium mass spectrometry testing (ISO 15184) to detect leaks as small as 1x10⁻⁹ mbar·L/s.
