Page 135 - GRINNELL Mechanical Grooved Piping Products EMEA

Pressure and Design Data
Misalignment and Deflection
Tech Data Sheets: G810, G820, G830
GRINNELL Flexible Couplings provide for restrained joints and allow for deflection to aid where the pipe or equipment is misaligned.
Note that flexible couplings will not accommodate both full maximum linear movement and the maximum available angular deflection concurrently at the same joint.
If it is desired to have both deflection and linear movement available, then the system should have sufficient flexible joints to accommodate the requirement.
Design Deflection for Roll Grooved Pipe
11⁄4
48.3
11⁄2
60.3
2
73.0
21⁄2
76.1
76,1mm
88.9
3
114.3
4
141.3
5
165.1
165,1mm
168.3
6
219.1
8
273.0
10
323.9
12
1.08° 0.94° 0.75° 0.62° 0.60° 0.51° 1.19° 0.97° 0.83° 0.81° 0.63° 0.50° 0.42°
Flexible couplings are also useful in laying out curved piping systems.
L
L = (2) (R) N=T
R = Radius of curve L = Pipe length
= Deflection from centre line, in degrees, for each coupling (see table)
N = Number of flexible couplings needed T = Total deflection, in degrees, required
R=
2
2
Pipe Size mm Inches
Deflection O (Roll Grooved Pipe)
Figures 705 & 707
42.4
Incorporates the recommended safety factor reduction for field practises (50% for sizes 32mm - 80mm (11⁄4" – 3") and 25% for sizes 100mm - 300mm (4" – 12")).
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