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 33 of 35
BLADDER INSTALLATION - VERTICAL 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 ange 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). Drill holes on both caps must be made to copy the
actual holes position on the tank ingots. Take a 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 bottom cap folded tight using, for instance, an adhesive tape to make sure it will pass through the bottom opening.
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. Lower the bladder with care from the top tank opening, making sure that the top and bottom caps are not rotated around the
bladder axis (use the marks made with the pen/marker). For larger bladders this operation may require a fork-lift or other lifting
equipment operated by an authorized operator.
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. The rope and adhesive tape can now be removed and the rubber neck and ange will open out
and can be secured into position. The upper 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!!
6. 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.
7. Reassemble the bottom bladder ange 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;
8. 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;
9. 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;
10. Perform the bladder tank lling according to Section 7.;
NOTICE
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