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 32 of 35
The bladder replacement operation is split into two parts: removal of the existing bladder and installation of a new one.
Referring to Figure 3.3.1 and 10.4.1
This bladder replacement operation requires at least 2 personnel.
Additional tools and accessories such as a torch, rope/string, and strong adhesive tape will also be required
BLADDER REMOVAL – VERTICAL & HORIZONTAL TANKS
1. Close the foam concentrate (12) and water (11) cut-off valves;
2. Completely drain the water from the region outside the bladder by opening water drain valve (7) and the water vent valve (2).
In the event of bladder failure, a solution of water and foam may ow through valve (7) so all necessary measures to avoid
environmental concerns must be taken.
3. Drain the foam inside the bladder by opening the valve (8). For large volumes the lling pump could also be used. Adopt
suitable safety measures to collect all the foam in such a way to avoid environmental concerns.
4. Disconnect and remove the relevant foam discharge piping from the top of the bladder tank connecting the tank to the ratio
controller.
Disconnect the foam level indicator trim from the foam outlet welded to the tank’s bottom ange.
5. Remove all bolts and then the top, bottom and side anges (horizontal tank only).
6. Withdraw the drilled tube out of the top opening for vertical tanks. For horizontal tanks, remove the horizontal tube from the
large inspection ange on the side (A) of the tank and then the vertical running tube out of the top opening (C) (gure 10.4.1).
7. Vertical Tanks: - Extract the bladder from the top opening taking care to fold the bottom cap in such a way it can pass through
the bottom opening. For larger bladders this operation may require the use of a fork-lift or other lifting equipment operated by
an authorized operator.
Horizontal Tanks: - Extract the bladder from the side inspection ange (A) taking care to fold the bottom, top and side caps in
such a way they can pass through their respective openings.
TIP: - After folding in the ange caps but before removing the bladder, it is advisable to replace the bottom ange (D) which
includes the drain connection. As it is very difcult to fully drain the tank and bladder contents in steps 2 and 3, this will facilitate
a controlled draining of the bladder contents as it is withdrawn from the tank.
8. Thoroughly clean the internal walls of the bladder tank with a hose and inspect the inside of the tank for any debris that could
have been responsible for the bladder rupture.
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