epros®DrainLiner Program - Trelleborg

Calibration Hoses
The rehabilitation of pipe runs according to the epros ® DrainLiner open-end
method always requires a calibration hose to be inverted. This is necessary to
support and expand the liner, which is loose in the line due to the open end,
and to hold it expanded until final cure.
The supporting calibration hose can be inverted along with the liner, e. g. if a
head of water (water column) is used for installation. However, if an inversion
drum is used, it is advisable to invert the calibration hose in a second step
after liner inversion only in order to use the inversion drum‘s full capacity in
terms of lining length. The subsequent installation of the calibration hose is
also required in case of dimensional changes, because simultaneous inversion
would not allow the liner to be optimally expanded to the largest host pipe
diameter.
On the other hand, if vertical pipe runs like drop pipes are to be lined, it is
important to invert the calibration hose together with the liner tube, because
the hose will stabilize the length of the liner during installation and prevent
the liner from getting too long by its sole dead weight or from being contracted
„from the bottom to the top“ during the lining operation. What is important is
to keep the liner under pressure in order to maintain a minimum stability.
The Trelleborg Pipe Seals product program offers various models for each
particular application:
epros ® DrainCali Typ „Light Duty“ (DN 65 – DN 200)
epros ® DrainCali Typ „Heavy Duty“ (DN 100 – DN 300)
epros ® DrainCali Typ „Heavy Weight“ (DN 350 – DN 600)
They are described in more detail in the following.
DRAIN LINING