Page 157 - GRINNELL Mechanical Products Catalogue

pRESSuRE & DESiGN DATA
The following guidelines are similar to any
expansion joint:
It is recommended that anchors be installed at changes of direction on the pipe lines to control the pipe movement . The thermal expansion/contraction in the piping system can be accommodated using GRINNELL Flexible Couplings . In designing anchoring systems, it is suggested that the following be taken into consideration:
• Pressure Thrusts
• Frictional Resistance of Any Guides or Supports
• Centrifugal Thrust Due to Velocity at Changes of Direction
• Activation Force Required to Compress or Expand a Flexible Coupling
Three methods are available as examples to accommodate thermal expansion/contraction:
1-1⁄4 35 1-1⁄2 45 2 70
2-1⁄2 100 – 110 3 145 4 240 5 375 – 500 6 520 8 880
273.0 6072
10 1365 12 1915
Thermal Movement
Activation Force
Pipe Size
mm
Inches
Activation Force N
lbs
42.4
156
48.3
200
60.3
311
73.0
645
76.1mm
489
88.9
645
114.3
1068
141.3
1668
165.1mm
2224
Anchor Position
(1) Design the system with rigid couplings and place expansion joints at the proper locations . Expansion joints may be a series of flexible grooved couplings of a sufficient quantity to accommodate the movement .
(2) Design the system with flexible and/
or rigid couplings and allow the pipe to move in directions desired, with the use of anchors and guides if so required . With this method, it is important
to ensure that movement at branch connections, changes of direction, equipment hookup, etc ., will not cause damage or harmful stresses .
(3) Design the system with flexible couplings utilising the expansion/contraction capabilities of these products .
168.3
2313
219.1
3914
Expansion Joint Fig. 7550
• 150mm (6") Schedule 40 steel pipe, roll grooved, 45 .7m (150') long, anchored at each end
• Maximum Temperature = 93.3°C (200°F) • Minimum Temperature = 4.4°C (40°F)
• Instal Temperature = 26.6°C (80°F)
Intermediate Guides
323.9
8518
The following example illustrates this method:
Flexible Couplings
Refer to back cover for country-specific customer care numbers.
157
Anchor Position
Intermediate Guides
Intermediate Guides
Design Data