ASTM A182 F53 Super Duplex Steel 2507 Nipolet Fitting MSS SP-97
ASTM A182 F53 Super Duplex Steel 2507 / S32750 Nipolet , MSS SP-97 Pipe Fitting
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It functions as a hybrid of three components:
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Weldolet/Nipolet (for branch integration)
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Flange (for bolted connection)
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This design eliminates intermediate welds, enhancing structural integrity and leak prevention.
ASTM A182 F53 Super Duplex Pipe Fitting Specification
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A Nipolet combines a branch outlet fitting (similar to Weldolet) with a flange, forming an integrated unit for 90° branch connections3.
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It functions as a hybrid of three components:
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Weldolet/Nipolet (for branch integration)
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Flange (for bolted connection)
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This design eliminates intermediate welds, enhancing structural integrity and leak prevention.
Chemical Composition of A182 F53 Super Duplex Pipe Fittings
| UNS | C % | Cr % | Ni % | Mo % | N % | Mn % | Cu % | W | S | Si |
|---|---|---|---|---|---|---|---|---|---|---|
| S32750 | < 0.03 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | < 1.20 | < 0.5 | - | - | - |
| 2507 | < 0.03 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | < 1.20 | < 0.5 | - | - | - |
| F53 | < 0.03 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | < 1.20 | < 0.5 | - | - | - |
Mechanical Propertities of A182 F53 Super Duplex Pipe Olet
| Grade | YS (MPa) | TS (MPa) | % Elongation | Hardness(BHN) |
|---|---|---|---|---|
| UNS S32750 | 550 min. | 795 min. | 15 min. | 310 max. |
| 2507 | 550 min. | 795 min. | 15 min. | 310 max. |
| F53 | 550 min. | 795 min. | 15 min. | 310 max. |
Design and Testing of pipe olet
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Reinforcement Principle: Forged fittings eliminate the need for external reinforcement by integrating extra material around the branch junction310.
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Testing:
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No Hydrostatic Testing: Fittings rely on validated design calculations instead of mandatory hydrotests10.
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Non-Destructive Examination (NDE): Mandatory radiography/ultrasonic testing for weld integrity3.
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Marking Requirements: Each fitting must include:
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Manufacturer’s trademark, material grade (e.g., WPHY-52), size (Run NPS × Outlet NPS), and "SP-97"
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Applications
- Sectors: Oil and gas, chemical processing, power generation, and nuclear facilities.
- Global Alignment: Works with ASME BPVC, ASTM, and API standards to ensure U.S. and international compliance.
- Case Example: Hastelloy C276 Weldolets® for corrosive environments in chemical plants.
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