Center to end distance of the elbow.doc
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Center to end distance of the elbow
· The standard radius of bending of the elbow as per ASME B16.9 is two types
1. long radius
2. short radius
· long radius means the radius of the center line circle of the elbow is 1.5*D (where D is the nominal pipe size)
· short radius means the radius of the center line circle of the elbow is 1*D (where D is the nominal pipe size)
· to calculate the center to end distance for elbow with any angle (θ°elbow ) consider figure 1 (shown below)
a: the center to end distance of the elbow (to be calculated)
R: The radius of bending of the elbow
θ: the elbow angle(degree of bending)
tan (θ/2)= a/R
a = R * tan (θ/2)
in case of long radius R = 1.5 * D
So, a = 1.5 D * tan (θ/2)
NOTES:
· θ in degrees
· D in inches
· In case of elbow 90° the equation will be simplified to (a = 1.5*D )
· To convert “a “ to SI units multiply by 25.4
Figure 1
regards,