ASME B16.49-2007 pdf free download.Factory-Made, Wrought Steel, Buttwelding Induction Bends for Transportation and Distribution Systems.the outside arc of the bend. intrados: the inside arc of the bend.
alinirn urn (design) wall thickness: the wall thickness sped— lied or computed in accordance with the piping code as the minimum acceptable for the temperature and pressure application.
nominal (design) wall thickness: the wall thickness specified on the order or marked on the bend.
qualification bend: a bend segment that is produced and tested and is used to qualify the bending procedure.
transition zone: the area, at the tangent points of a bend, that covers the change (transition) from unheated to heated material.
NOTE: The terms “bender” and “manuf.ctunr” .ire used interchangeably in this S4andard.
1.11 Ordering Information
The purchaser shall be responsible to specify all the ordering information necessary to purchase the needed bends. Examples of such information include, but are not limited to, the following:
(a) quantity
(1’) description of bend and nominal dimensions (i.e., size, bend radius, wall thickness, bend angle, tangent lengths, etc.)
(c) steel composition by grade
(d) seamless or welded
(e) specification number (including year)
(f) supplementary requirements 1mm section SRI5
(g) additional requirements
Nonmandatory Appendix B is provided as one possible guideline for providing the required information.
2 PRESSURE RATINGS
2.1 Basis of Ratings
The allowable internal pressure rating for bends designed in accordance with this Standard shall not be less than that which is calculated for straight seamless pipe (or for pipe welded with a joint efficiency factor of 1.0) of equivalent material (as shown by comparison of composition and mechanical properties in the respective material specifications) in accordance with the rules established in the applicable sections of the referencing code for pressure piping. For these calculations, applicable data for the nominal size, nominal wall thickness, and material equivalent to that of the bend material shall be used. Nominal size, nominal wall thickness, and material identity markings on the bend may be used in lieu of pressure-rating markings.
3 SIZE
The diameter of bends shall be identified by the nominal pipe size (NI’S) as defined in ASME B36.1OM (e.g., NPS 24). Alternatively or in addition, the marking may include the nominal size as defined in ISO 6708, which consists of the letters “DN” followed by a dimensionless whole number, which is indirectly related to the physical size, in millimeters, of the outside diameter of pipe to which the bend is intended to be welded (e.g., DN 600).
4 MARKING
4.1 Standard Marking
Each bend shall be marked on the outside surface within 300 mm (12 in.) of one end to show the following:
(a) manufacturer’s name or trademark
(b) heat number or manufacturer’s heat identification
(C) material grade symbol (see para. 11.3 and Table 1)
(d) B16.49
(e) nominal pipe size (NI’S)
(f) nominal wall thickness
(g) bend radius
(h) bend angle
(I) postbending, heat-treatment condition (see para. 9.3)
(j) supplementary requirements (ii applicable) (see section SRI5)
Marking may be in any consistent units (metric or customary) but care shall be taken to avoid confusion. Use “X” and grade in lieu of “I” and grade for material designation for the customary stamping option.
When specified by the purchaser, each bend shall be paint stenciled with the same information in 25 mm (1 in.) or larger letters on the inside surface within 150 mm (6 in.) of each end, except for NI’S 12 (DN 300) or smaller, which only requires outside surface marking. Marking materials shall not adversely affect the bend or coating.