Jiang's blog: "amse"

vature of the external contoured portion of the outlet, i.e., hofi�� ro. See nomenclature and Fig. 404.3.1(b)(3). (b) These rules do not apply to any nozzle in which additional nonintegral material is applied in the form of rings, pads, or saddles. (c) These rules apply only to cases where the axis of the outlet intersects and is perpendicular to the axis of the header. (4) Notation. The notation used herein is illustrated in Fig. 404.3.1(b)(3). All dimensions are in inches (mm). D p outside diameter of header Dc p internal diameter of header Do p internal diameter of extruded outlet measured at the level of the outside surface of header d p outside diameter of branch pipe dc p internal diameter of branch pipe ho p height of the extruded lip. This must be equal to or greater than ro except as shown in para. 404.3.1(b)(4)(b) below. L p height of the reinforcement zone p 0.7 dTo r1 p half-width of reinforcement zone (equal to Do) ro p radius of curvature of external contoured por- tion of outlet measured in the plane containing the axes of the header and branch. This is sub- ject to the following limitations.

(a) Minimum Radius. This dimension shall not be less than 0.05d, except that on branch diameters larger than NPS 30 it need not exceed 1.50 in. (38 mm). (b) Maximum Radius. For outlet pipe sizes NPS 8 and larger, this dimension shall not exceed 0.10d + 0.50 in. (13 mm). For outlet pipe sizes less UL download than NPS 8, this dimension shall not be greater than 1.25 in. (32 mm). (c) When the external contour contains more than one radius, UL download the radius of any arc sector of approximately 45 deg shall meet the require- ments of paras. 404.3.1(b)(4)(a) and (b) above. (d) Machining shall not be employed in order to meet the above requirements. Tb p actual nominal wall thickness of branch Th p actual nominal wall thickness of header To p finished thickness of extruded outlet sured at a height equal to ro above the outside surface of the header tb p required thickness of the branch pipe according to the wall thickness equation in para. 404.1.2 th p required thickness of the header according to the wall thickness equation in para.