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Threaded Flange TR ASTM A182 ANSI B16.5
Threaded Flange
The threaded flange manufactured in accordance with ASME B16.5 is similar to the slip on flange, but the bore shall have a taper pipe thread conforming to ASME B1.20.1. The thread shall be concentric with the axis of the flange opening, and variations in alignment (perpendicular to the flange face) shall not exceed 5 mm per meter. Threaded flanges are available in sizes NPS 1/2 through NPS 24 for pressure ratings of Class 150, Class 300, Class 400, Class 600 and Class 900. Sizes for Class 1500 and Class 2500 are available from NPS 1/2 to NPS 2-1/2.
Product Information
| Product Name | Threaded Stainless Steel Flange |
| Size Range | 1/2’ to 24” |
| Pressure Class | 150, 300, 400, 600, 900, 1500, 2500, |
| Standards | ASTM A182 |
| Face Type | Threaded (TR) |
| Dimensions | ANSI B16.5, Custom Drawings |
| Thickness | Sch5S to Sch160, XXS |
| Origin | China |
| Applications | Water or air service operate at extreme pressure and normal temperatures and/or in high explosive areas where welding may create a hazard. |
| Test | Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, Ultrasonic flaw detector, Magnetic particle detector |
| Test Certificates | Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report |
Advantages & Disadvantages: Applications
The threaded flange joint can be assembled without welding. A pipe, which is furnished with tapered threads at its ends, can be readily assembled with the threaded flange. This feature makes the threaded flange well-suited to extreme pressure services that operate at normal ambient temperatures and in highly explosive areas where welding may create a hazard.
The disadvantages of threaded flanges are also obvious. The crevices formed between the external and internal threads may easily capture and retain process fluid. This makes the threaded connection susceptible to crevice corrosion during which process fluid penetrates the thread region and results in failure. The threaded joints also means significant stress risers. Since stress is drastically intensified in the thread region due to tightening, a relatively few cycles of expansion and contraction or movement caused by misalignment may subject the threaded flange to failure.
Threaded steel flanges are usually limited to water or air services for sizes NPS 6 (DN 150) or smaller and with design temperature not exceeding 250°F. They are not suitable for conditions involving high temperatures, cyclic stresses, or corrosive fluid. The dimensional tolerances of threaded flange are almost the same as that of Slip on flanges.