Stainless Steel Pipe Threaded Flange TR ASTM A182 ANSI B16.5

Threaded Flange TR ASTM A182 ANSI B16.5

Threaded Flange

ASTM A182 is a specification established by the American Society for Testing and Materials (ASTM) that covers forged or rolled alloy and stainless steel pipe flanges, fittings, valves, and parts. Within this specification, there is a specific type of flange called the ASTM A182 Threaded Flange.

ASTM A182 Threaded Flanges are available in various material grades, including stainless steel, alloy steel, and carbon steel. The specific material grade will depend on the application requirements and the compatibility with the fluid or gas being transported.

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.

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.

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.