Expansion Joint Guide Module 5 - Universal ... - BOA Group

Proceeding
a) Mark the values of the maximum axial and lateral movement for 1000 full load cycles, taken from the dimension table, onto the X- and Y-
axis.
maximum axial movement = ± 46 mm
maximum lateral movement = ± 77 mm
b) By connecting these corner points, the movement triangle is obtained (movement limiting line)
c) Mark the requested lateral movement (if the movement distribution is asymmetrical, take the maximum lateral movement part). At the
intersection with the movement limiting line, the maximum permissible axial movement of ± 22 mm can be determined.
So the expansion joint type UFS 6-20, DN 200, allows simultaneous axial movement of ± 22 mm, in addition to the requested lateral movement
of ± 40 mm.
Calculation of the prerestraint
Movement formula:
H = movement = total movement [mm]
Prerestraint formula:
prerestraint
H
2
H (t
t
max
e
t
t
min
min
)
mm
t min = minimum temperature [°C]
t max = maximum temperature [°C]
t e = installation temperature [°C]
Example
axial movement = ± 22 mm
lateral movement = ± 40 mm
t min = 0 °C
t max = 120 °C
t e = 20 °C
44 44 (20 0)
axial prerestraint =
= 14,67 mm 14.7 mm
2 120 0
80 80 (20 0)
lateral prerestraint =
= 26,67 mm 26.7 mm
2 120 0
4