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 34 of 35
BLADDER INSTALLATION - HORIZONTAL TANK ONLY
1. Replacement bladders are normally supplied with drilled caps to t the xing anges. In case they are not, drill the top and
bottom caps according to the anges holes. This operation must be made by marking a reference position with a pen/marker
on both the caps (for instance, that of the longitudinal welding of the tank). Drills on both the caps must be made to copy the
actual holes position on the tank ingots. Take record of the new bladder serial number and associate it to the bladder tank serial
number in the maintenance book for future reference;
2. Clean the surfaces of the bladder ingots and anges (top and bottom). The absence of any impurity or debris is essential for
proper bladder sealing at the top and bottom anges;
3. Keep the top, bottom and small cap folded tight using, for instance, an adhesive tape to make sure it will pass through the
bottom, top and side openings. String or rope can be carefully threaded through the rubber ange holes and secured – this will
aid maneuvering of the bladder into position later.
4. Insert the bladder with care from the inspection ange side opening (A) and drawer into the tank from the opposite side using
the pre-secured rope making sure that the top, side and bottom caps are not rotated around the bladder axis (use the marks
made with the pen/marker).
5. From the bottom of the tank, reach inside and guide the bladder cap through the opening taking care not to rotate out of
alignment with the top ange. Reach into the tank from the top opening and raise the bladder using the pre-installed rope.
Repeat the process for the small side ange.
TIP:- Subject to local regulations and permits, it is also possible for the operator to enter inside the tank to maneuver the
bladder into position.
6. The rope and adhesive tape can now be removed and the rubber neck(s) and ange(s) will open out and can be secured into
position. The large side rubber neck and ange can now be secured into position.
Cap rotation will result in unbalanced strains on the bladder during the lling & operation phase which are likely to produce bladder
ruptures!!
7. Insert the drilled tube from the top opening taking care to center it with respect to the lower opening and bladder ange.
Centering is automatic as the bottom ingot opening is just slightly larger than the pick-up tube. To make this operation easier,
the operator should reach into the tank and guide into place. Next, insert the horizontal drilled tube through the vertical tube
taking care to center it with respect to the side opening and bladder ange.
8. Reassemble the bottom and side bladder anges by screwing the bolts at the tightening torque value stated in gure 10.4.1
using a dynamometric wrench. Tighten each couple of opposite bolts at a time at a progressively increasing torque and repeat
the operation iteratively until the nominal value is achieved
9. Reassemble the top ange taking care to center the drilled tube in the opening. Again, centering is automatic as the top ange
is provided with a centering coupling whose diameter is larger than that of the drilled tube. Tighten the bolts at the torque
value stated in gure 10.4.1 using a dynamometric wrench. Tighten each couple of opposite bolts at a time at a progressively
increasing torque and repeat iteratively until the nominal value is achieved.
10. Reassemble the foam discharge piping to the top ange, replacing the old gaskets with new ones, and the foam level indicator
trim to the welded pipe at the bottom ange.
11. Perform the bladder tank lling according to Section 7.
NOTICE
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