Page 159 - GRINNELL Mechanical Products Catalogue

pRESSuRE & DESiGN DATA
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 .
Misalignment & Deflection
Design Deflection for Roll Grooved Pipe
Pipe Size Inches mm
Figures 705 & 707
42.4
1-1⁄4
48.3
1-1⁄2
60.3
2
73.0
2-1⁄2
76.1mm
–
88.9
3
114.3
4
141.3
5
165.1mm
–
168.3
6
219.1
8
273.0
10
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 . 323.9
R= L
(2) (Sin 2 )
L = (2) (R) (Sin 2 ) N=T
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")).
R = L =
Radius of curve Pipe length
N = T =
Number of flexible couplings needed Total deflection, in degrees, required
= Deflection from centreline, in degrees, for each coupling (see table)
Refer to back cover for country-specific customer care numbers.
159
Deflection O (Roll Grooved Pipe)
Design Data