Page 184 - Tyco-Grooved-Fire-Protection-Products-Installation-Handbook

182 SYSTEM DESIGN
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.
END GAP
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 as follows:
PIPE ENDS GAPPED FOR EXPANSION
End Gap Reduction
Nominal Pipe Size ANSI Inches DN
Maximum Pipe End Gap Reduction
1-1/4 - 3
32 - 80
50%
4-24
100 - 600
25%
Therefore the following values should be used as available pipe end movements for Grinnell Figure 705 and 716 Flexible Couplings:
Pipe End Movements
Nominal Pipe Size ANSI Inches DN
Cut Grooved Inches (mm)
Roll Grooved* Inches (mm)
1-1/4 - 3
32 - 80
0 - 0.063 (0 - 1,6)
0 - 0.031 (0 - 0,8)
4 - 24
100 - 600
0 - 0.188 (0 - 4,8)
0 - 0.094 (0 - 2,4)
* Roll grooved joints provide 1/2 the available movement of cut grooved joints.