www.futurepipe.com/usa

Page 26 of 51
6. ALLOWABLE JOINT ANGULAR DEFLECTION
Radius
Deflection angle
a
Figure 7: Joint deflections, offset and radius of curvature
Figure 7: Joint deflections, offset and radius of curvature
Nominal
Pipe
Diameter
inch
Offset
Double bell coupler joint angular deflection,
offset and radius of curvature
The maximum angular change of direction between
The maximum angular change of direction between
pipe axis (equally distributed at both sides of the
pipe axis (equally distributed at both sides of
coupling) must not exceed exeed the amount given in the
thecoupling) must not exceed the amount given in
following table:
thefollowing table:
A
Maximum
Angular
Deflection
Nominal Angular Deflection at Joint
Nominal Offset (in)
Minimum Radius of Curvature (ft)
Section lengths (ft)
10 ft 16 ft 20 ft 40 ft 10 ft 16 ft 20 ft 40 ft
up to 20 3.0 6.3 10.1 12.6 25.2 191 306 382 764
24-36 2.0 4.2 6.7 8.4 16.8 286 458 573 1164
40-48 1.5 3.1 5.0 6.3 12.6 382 611 764 1528
52-72 1.0 2.1 3.4 4.2 8.4 573 917 1146 2292
78 &
larger
0.5 1.0 1.7 2.1 4.2 1146 1833 2292 4584
Note: For slip-lining pipe, the allowable deflection is 1/2 the above values.
L
B