ASME B16.9 2012 Factory Made Wrought Buttwelding Fittings

ASME B16.9 Factory Made Wrought Buttwelding Fittings

ASME B16.9 covers overall dimensions, tolerances,  ratings, testing, and markings for wrought factory-made  buttwelding fittings in sizes NPS 1;2 through 48 (DN 15  through 1200).

1.2 Special Fittings  Fittings may be made to special dimensions, sizes,  shapes, and tolerances by agreement between the manufacturer and the purchaser.  

1.3 Fabricated Fittings  Fabricated laterals and other fittings employing circumferential or intersection welds are considered pipe  fabrication and are not within the scope of this Standard.  Fabricated lap joint stub ends are exempt from the  above restrictions, provided they meet all the requirements of the applicable ASTM material specification  listed in para. 5.  

1.4 Standard Units  The values stated in either metric or U.s. customary  units are to be regarded separately as standard. Within  the text, the U.S. customary units 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 the  two systems may result in nonconformance with this  Standard.  The designation for size is NPS for both metric and  customary dimensioned fittings. Fitting pressure rating  is associated with the connecting wall thickness of pipe  of equivalent size and material.