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 26 of 35
1. At the end of the operation, restore all the bladder tank valves to their original conguration. The concentrate (12) and water
(11) cut-off valves, that are currently in the closed position after the lling operations must now be opened if the bladder tank
is designated to operate automatically (i.e. without human operation at the tank’s position). Please ensure the valves are
opened slowly. In order to avoid water or foam concentrate migration outside the bladder tank due to siphoning, it is highly
recommended that the connecting these valves to the system are constantly under pressure.
Note: If optional sight tube (shown right) is used
instead of the hydrometer, Steps 1-7 must still be
followed. In Step 4 the volume level will be shown
directly in the sight tube after rotating the valve
at the entrance to the tube.
The level indicator is not designed to withstand the bladder tank design pressure. Any pressure in excess to 0.6 bar will result
in a hydrometer failure. Before commutating the 3-way valve (9) from its normal position to the measurement position,
please always make sure that the bladder tank is not subject to any pressure other than water or foam concentrate static
head.
The foam concentrate level measurement must be made as a minimum after any operation of the bladder tank and according to
the schedule of table 10.3.1.
Figure 9.1.1: example of bladder tank lled by foam up to partial capacity
WARNING
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