BLADDER TANK MODEL VFT & FT
INSTALLATION, OPERATION AND
MAINTENANCE MANUAL
(
foam concentrate inside the bladder
)
TECHNICAL
MANUAL
F_032216 16.1 | TM1.3.1.1/14032016/en
The Viking Corporation, 210 N Industrial Park Drive, Hastings MI 49058
Telephone: 269-945-9501 Technical Services: 877-384-5464 Fax: 269-818-1680 Email: techsvcs@vikingcorp.com
VISIT THE VIKING WEBSITE FOR THE LATEST EDITION OF THIS TECHNICAL MANUAL
Page 21 of 35
13a. (Alternative): foam lling up to the total capacity
Even if not normally recommended, and limited to situation where the bladder tank is subject to constant temperature, there may be
some situations where lling the bladder up to the total capacity is necessary.
In this case the installer/end user must make sure that the temperature of the foam concentrate from the atmospheric container is
not lower than the (constant) room temperature. If it does not happens the tank may be subject to overpressure due to concentrate
expansion that cannot be compensated by the thermal relief valve on the water side.
If such a circumstance is envisaged, the installer/end user must require at the order the installation of an additional safety valve
on the foam side. In this case foam pumping must continue until water is vented through valve (2) and foam is discharged through
valve (5). In this circumstance the process skips step 13. and jumps directly to step 14. The situation is described in gure 7.3.7;
CAUTION
Figure 7.3.7: Bladder tank lled by foam up to its full capacity
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