Closely-Spaced Mitered Bend - CAESAR II - Reference Data

CAESAR II Applications Guide

PPMProduct
CAESAR II
PPMCategory_custom
Reference Data
Version_CAESAR
12

Miter bends are closely spaced if:

S < r [1 + tan (q)]

Where:

S = miter spacing

r = average pipe cross section radius: (ri+ro)/2

q = one-half the angle between adjacent miter cuts

B31.1 has additional requirements:

B > 6 tn

q £ 22.5 deg.

B = length of the miter segment at the crotch.

tn = nominal wall thickness of pipe.

Closely spaced miters, regardless of the number of miter cuts, can be defined as a single bend. CAESAR II always calculates the spacing from the bend radius. If you have the miter spacing but not the bend radius, the radius must be calculated as shown in the following example. The mitered bend shown below has four cuts through 90º and a spacing of 15.913 inches.

q

=

a / 2N

=

90 / [2(4)]

=

11.25º

Req

=

S / [ 2 tan (q)]

=

15.913 / [2 tan (11.25º)]

=

40