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Reg. 361

STEAM- PIPES FITTINGS AND CONNECTIONS

Wrought Bends

a)

Pipes of thickness determined in accordance with equation 91 with increase of 12.5% shall not be bent to radii less than those given in the following Table. Where smaller radii are necessary, further allowance shall be made for thinning at the back of the bend except where it can be demonstrated to the satisfaction of the Inspection Authority that the use of tb will not reduce the thickness below t at any point after bending.

Where,

t = min. thickness as per Eq.91
tb = thickness before bending.

TABLE
Minimum bending radii for pipes of thickness determined in accordance with clause (a) of regulation 361.

Outside diameter Radii measured to Centre line of pipe
  tb=1.125 t
All thickness
tb=1.1 t
tb=34.92 mm
or above
mm mm mm
20.9 63.5  
33.7 76.2  
42.4 101.6  
48.3 114.3  
60.3 152.4  
76.1 190.5  
88.9 228.6  
101.6 266.7  
114.3 304.8  
127.0 355.6  
139.7 381.0  
152.4 431.8  
168.3 457.2  
193.7 635.0  
219.1 711.2  
244.5 812.8 1143.0
273.0 1016.0 1270.0
298.5 1117.0 1397.0
323.9 1219.2 1524.0
355.6 1498.6 1778.0
406.4 1727.2 2032.0
457.0 2032.0 2086.0
   
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