ASTM A182 F53 Super Duplex Steel 2507 / S32750 Nipolet , MSS SP-97 Pipe Fitting
It functions as a hybrid of three components:
Weldolet/Nipolet (for branch integration)
Flange (for bolted connection)
This design eliminates intermediate welds, enhancing structural integrity and leak prevention.
ASTM A182 F53 Super Duplex Pipe Fitting Specification
A Nipolet combines a branch outlet fitting (similar to Weldolet) with a flange, forming an integrated unit for 90° branch connections3.
It functions as a hybrid of three components:
Weldolet/Nipolet (for branch integration)
Flange (for bolted connection)
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
Reinforcement Principle: Forged fittings eliminate the need for external reinforcement by integrating extra material around the branch junction310.
Testing:
No Hydrostatic Testing: Fittings rely on validated design calculations instead of mandatory hydrotests10.
Non-Destructive Examination (NDE): Mandatory radiography/ultrasonic testing for weld integrity3.
Marking Requirements: Each fitting must include:
Manufacturer’s trademark, material grade (e.g., WPHY-52), size (Run NPS × Outlet NPS), and "SP-97"
Applications