Page 396 - Mechanical Products Installation Handbook IH-1000M

388 PRESSURE & DESIGN DATA Linear Movement
Flexible Couplings
For thermal expansion with flexible couplings, the pipe ends at each joint should be fully gapped to the maximum end gap. This can be accom- plished by pressurizing the system and then anchoring the system.
Pipe Ends Gapped for Expansion
For thermal contraction with flexible couplings, the pipe ends at each joint should be fully butted. The system can then be anchored in place to prevent the pipe ends from opening up to the maximum end gap when pressurized.
Pipe Ends
Butted for Contraction
For design purposes, the maximum pipe end gap should be reduced to account for field practices.
End Gap Reduction
Nominal Pipe Size ANSI Inches
DN
Maximum Pipe End Gap Reduction
1-1/4 - 3
32 - 80
4 - 24
100 - 600
50%
25%
Therefore the following values should be used as available pipe end movements for GRINNELL Figure 705, 707 and 716 Flexible Couplings:
Nominal Pipe Size ANSI Inches
DN
Cut Grooved Inches mm
Roll Grooveda Inches mm
1-1/4 - 3
32 - 80
4 - 24
100 - 600
Pipe End Movements
0 - 0.063
0 - 1,6
0 - 0.188
0 - 4,8
0 - 0.031
0 - 0,8
0 - 0.094
0 - 2,4
a. Rollgroovedjointsprovide1/2theavailablemovementofcutgroovedjoints.
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Refer to Technical Data Sheets G810, G820, and G830 for more information.