Pompetravaini TRSK 2002/1, Operating Manual, Page: 23 / 32

Operating manual liquid ring vacuum pumps TRVK - TRSK
23
Fig. 23
External flushing to the packing Fig. 24
Internal flushing to the packing
13.3.1 - ADJUSTMENT OF THE PACKING
All adjustment operations must be performed with the PUMP STOPPED following the safety measures given in
chapter 2. After completion of the work ALWAYS re-install the safety guards previously removed.
At first start up loosen the nuts of the packing gland allowing a steady flow of liquid to drain out (see fig. 22).
After obtaining a steady flow of leakage gradually tighten the gland nuts until attaining a steady dripping within the limit of
the above recommended temperature.
The magnitude of leakage depends proportionally to the size of the pump and from the operating pressure in the packing
housing: in any case, the discharging liquid temperature from the packing housing must not be more than 50°C when the
liquid enters the pump at ambient temperature.
A few hours time span may be required to establish a steady dripping at low temperatures.
Packing adjustment is required when the liquid leakage increases.
When adjustment is no longer possible, the packing material should be replaced with new one (see following chapter).
In the event the pump remains out of service for more than 6 months it is recommended to replace the packing rings,
prior to start-up.
13.3.2
– REPLACEMENT OF THE PACKING RINGS
The replacement of the packing rings can be implemented without disassembling the pump with the following steps. Slide
the packing gland as much as possible towards the bearing after removing from the studs the adjustment nuts for the
packing gland.
With a suitable tool remove the packing ring and the lantern ring.
Thoroughly clean the packing housing and the shaft sleeve, removing any possible incrustation, oxidations and residues
from the washing liquid.
Install new packing rings one at a time and the lantern ring in the packing housing, keeping close attention to position the
rings with the joints offset by 90° (see fig. 25).
Reinstall the packing gland with the respective adjustment nuts and make the necessary adjustments as described in the
previous chapters.
Fig. 25