Corner radius

OD - Outside Diameter THK - Thickness OH - Overall Height SF - Straight Flange RD - Radius of Dish ICR - Inside Corner Radius IDD - Inside Depth of Dish... 

OD — Outside Diameter THK — Thickness OH — Overall Height SF — Straight Flange RD — Radius of Dish ICR — Inside Corner Radius IDD — Inside Depth of Dish... 

Meeting all A.S.M.E. Unfired Pressure Vessel Code requirements, the 80-10" Head permits significantly higher pressures than other configurations selected for the same service. The 80-10 " Head is named for its unique dimensions—the dish radius equals 80% of the head diameter and the inside corner radius equals 10% of the head diameter. These dimensions compare to 100% and 6% respectively for A.S.M.E. F D Heads. 

Flat plates are used as covers for manways and as the channel covers of heat exchangers. Formed flat ends, known as flange-only ends, are manufactured by turning over a flange with a small radius on a flat plate, as shown in Figure 13.9a. The corner radius reduces the abrupt change of shape, at the junction with the cylindrical section, which reduces the local stresses to some extent flange-only heads are the cheapest type of formed head to manufacture, but their use is limited to low-pressure and small-diameter vessels. 

A square-edged or sharp-edged orifice is a clean cut square-edge hole with straight walls perpendicular to the flat upstream face of a thin plate placed crosswise of the channel. The stream issuing from such an orifice attains its minimum cross section (vena-contracta) at a distance downstream of the orifice. This varies with the ratio, p, of the orifice to the pipe diameter. All measurements of the distance from the orifice are made from the upstream face of the plate for the corner, radius, pipe, and vena contracta taps. 

For equilateral triangular ducts having rounded corners with a ratio of the corner radius of curvature to the hydraulic diameter of 0.15, Campbell and Perkins [180] have measured the local friction factor and heat transfer coefficients with the boundary condition on all three walls over the range 6000 < Re < 4 x 104. The results are reported in terms of the hydrodynamically developed flow friction factor in the thermal entrance region with the local wall (Tw) to fluid bulk mean (Tm) temperature ratio in the range 1.1 < TJTm < 2.11, 6000 < Re < 4 x 10 and 7.45 [Pg.382]

Vl = longitudinal shear force, lb V(. = circumferential shear h>rce, lb R,n = mean radius of shell, in, r = outside radius of circular attachment, in. r = corner radius of attachment, in. 

Table 4.1 Stress Levels as a Ratio of Corner Radius to Wall Thickness...

The strip with thickness t in Fig. 4.19 is solidly held in a vise. When a force F acts in the direction shown, the comer will be stressed. Table 4.1 shows the stress level in the corner. The stress level increases dramatically as the corner radius r gets smaller in relation to the thickness t. On the other hand, increasing the radius r to more than 1.0 x r does not significantly increase the strength of the comer. 

A right angle bracket has leg lengths of 90 and 50 mm with a 3 mm corner radius and is made from 14 SWG (2 mm) sheet. Calculate the developed length (ans. 138.3). 

This cutter has a concave quarter circle on one side and is used to produce a corner radius on the edge of the workpiece. Fig. 11.8(g). Cutters are available with a variety of corner radii from 1.5 mm to 20 mm. 

Mat and fabric reinforcements tend to follow the line of least resistance and will move away from the die surface at corner details, particulary if the wall thickness increases at the corner. This creates a resin rich area on the outside of the radius which is vulnerable to cracking. This can be alleviated by an increase in fibre content or filler content but the reinforcement conforms to the shape more easily and stress concentrations are reduced if the corner radius is as large as possible and if the wall thickness is constant throughout the radius. The preferred minimum corner radius for internal radii is 1.5 mm and in order to maintain a uniform wall thickness throughout the comer, the external radius should equal the internal radius plus wall thickness. 

P = internal pressure psi r = inside corner radius of head, in. 

This word designates the size of a corner radius, e.g. 

Box flanges and cover plates 1.40 strut with separator Full projecting width for others Plates supported along two edges Clear distance between webs minus inside corner radius on each... 

Failure mode 1 - crack opening along the circumferential direction at the transition zone between the inclined wall and the corner radius of the parts (Figure 8.2a) ... 

Schematic representation of the stress field in a cross-section view of the SPIF process by a meridional plane the detail of the Instantaneous plastically deforming region BC Illustrates thinning at the corner radius...

Table 5.7 gives the inside-corner radius and radius of dish for code flanged and dished heads. Table 5.8 gives the straight-flange length for different head thicknesses <>f flanged and dished heads. 

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