ASME B16.49 Factory-Made, Wrought Steel, Buttwelding Induction Bends for Transportation and Distribution Systems

ASME B16.49 Factory-Made, Wrought Steel, Buttwelding Induction Bends for Transportation and Distribution Systems 

 SCOPE AND DEFINITIONS

1.1 General

This Standard covers design, material, manufacturing, testing, marking, and inspection requirements for factory-made pipeline bends of carbon steel materials having controlled chemistry and mechanical properties, produced by the induction bending process, with or without tangents. This Standard covers induction bends for transportation and distribution piping applications (e.g., ASME B31.4, B31.8, and B31.11). Process and power piping have differing requirements and materials that may not be appropriate for the restrictions and examinations described herein and, therefore, are not included in this Standard.

1.2 Manufacturing Process

This process utilizes induction heating to heat a narrow band 360 deg around a pipe or cylinder at the point of bending as the pipe or cylinder is being pushed through the inductor coil at a constant velocity. After the material passes through the coil, it may be cooled by forced air or water spray, or it may be allowed to cool in still air. Bends in any producible wall thickness and diameter are covered. Induction bends covered by this Standard may be produced from seamless pipe, welded pipe, or cylinders.

1.3 Fabricated Bends

Larger angle bends obtained by girth welding two or more smaller angle bends together are considered pipe fabrications and as such are not within the scope of this Standard.

1.4 Standard Units

The values stated in either metric units or U.S. Customary units are to be regarded separately as standard. Within the text, Customary values are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from two systems may result in nonconformance with the standard.