Geberit HDPE - Managing Thermal Movement - Buried Drain Application

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Geberit Drainage Systems
Buried drain systems
Like above ground systems, the key aspect of underground installation is the management of expansion/thermal movement.
Use of expansion sockets
In addition to the butt welded and electrofusion welded
connection, the expansion socket is an ideal connection
in underground drainage systems. Since in such systems
lower temperature differences are usually encountered
than in stacks and connector pipes, smaller length
variations can be accounted for.
For this reason in underground installations the distance
between expansion sockets can be longer.
The values calculated according to the formula
and rounded off.
Please note: The scale found on the outer surface
of the socket does not apply in the case of underground
installations.
Insert bevelled pipe to maximum socket depth,
mark and pull back 40mm.
7.3 Managing thermal movement - Buried drain application
SL (socket length)
ID (insertion depth)
d
PL (pipe length)
PL
ID 4cm4cm
PL ≤ SL - 0.3 d
0.006
✘
Nominal Socket Pipe length Insertion
outside length PL (for ∆t depth
diameter SL ≤ 30ºC) ID
Ø (mm) (mm) PL (m) (mm)
110 140 15 130
125 140 15 130
160 140 15 130
200 220 20 230
250 220 20 230
315 220 20 230