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 8 of 35
For standard bladder tanks with volume from 25 to 775 liters, the following data table applies:
All tanks veried in compliance with Directive 97/23/EC are CE marked with the following exceptions
(Art. 3, Para. 3 of the aforementioned Directive):
• Tanks rated 12.1 bar with volumes equal or lower than 800 liters
• Tanks rated 16.0 bar with volumes equal or lower than 600 liters
The bladder tanks manufactured by Viking are designed taking into account the following:
1. maximum expected pressure at the design condition and at the hydraulic test condition
2. maximum temperature at the design condition and at the hydraulic test condition
3. static pressure of the uid (due to the bladder tank height)
4. stress due to handling (lifting lugs verication)
5. stress on the supporting legs
The design of the bladder tank supplied by Viking does not normally take in consideration, if not otherwise requested on the
Purchaser Order:
6. unstable uid decomposition (not expected with water and foam concentrate)
7. external re
8. corrosion allowance
9. stress due to the wind (the bladder tank shall be placed in a protected area unless it is calculated according to the actual
wind site conditions)
10. seismic stresses (the bladder tank shall be placed in a non-seismic area unless it is calculated according to the actual site
conditions)
11. stresses due to loads on the bladder tank’s nozzles (there are to be avoided, see below)
Table 3.2.2: Design data
Internal volume See nameplate (from 25 litres to 775 litres)
Design pressure Ps 12.1 barg (175 psig) or 16 barg (232 psig)
Minimum/maximum metal design temperature Ts -10 °C, +50 °C
Hydraulic test pressure ASME VIII Div.1:
ASME VIII Div.1 + PED:
EN 13445:
1.3 x Ps
1.43 x Ps
1.43 x Ps (c(*)=0,85) or
2.20 x Ps (c(*)=0,70)
Corrosion thickness 0,0 mm
Fluid / physical state Water-foam concentrate / Liquids
Fluid group (Art. 9 of 97/23/EC, if applicable) Gr. 2
Category (Annex II of 97/23/EC, if applicable) N/A (Art. 3, Par. 3)
Evaluation form (Annex III of 97/23/EC, if applicable) N/A (Art. 3, Par. 3)
(*) C is dened as Welding Joint Efciency coefcient as reected by the design calculation
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