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 14 of 35
6.2 System (primary) relief valve
The installer/owner has to ensure that the maximum working pressure of the system the bladder tank is connected to - as
determined at the equipment’s installation position - does not exceed the design pressure of the bladder tank. In case the maximum
working pressure exceeds, under any condition (including failure) the Viking bladder tank’s nameplate design value, a primary
safety valve or equivalent device to control the overpressure must be installed by the installer/owner/end user. This valve or
device must by sized so that its capacity is larger than the maximum uid overow responsible for the overpressure of the bladder
tank. The bladder tank safety valve shall not be considered in this calculation.
The pressure setting of the primary relief valve or equivalent pressure control device must be not higher than the design pressure of
the bladder tank. The valve(s) shall be of such design and construction so that the temporary peak overpressure at the bladder tank
is limited to a maximum 10% under any condition including system failure.
The installation position of the primary relief valve or equivalent pressure control device shall be determined based on the
applicable technical standards and good engineering practice. This should be upstream of the complete bladder tank arrangement
and not on the tank water connection pipework only. The operation of these devices shall not cause hazards to people and property.
If the drain port is piped, care must be taken that the safety device capacity is not lowered. Pressure indicators in addition to those
provided by Viking (that are factory installed on the bladder tank), must be placed throughout the system to adequately monitor the
pressure value.
The selection and installation of the primary relief valve or of an equivalent pressure control device is normally part of the nal
approval of the system and coded by the applicable legislation on this matter (e.g. for European installation, the Directive 97/23/EC
“Pressure Equipment Directive).
6.3 Installation of the bladder tank
The following precautions must be observed:
1. During the system installation it is essential to keep valves 11 & 12 closed (gure 3.3.1).
2. This will avoid that debris or test water/air can enter the tank before the pipework is ushed and tank lling / commissioning
procedures are due to commence.
3. Bladder tank positioning to the designated installation place must be made using the tank’s lifting lugs.
4. The installer/end user must securely x the tank to the ground with appropriate anchor bolts/rods designed to withstand the
loads determined by site conditions (wind, seismic, etc…).
5. The discharge port of the thermal relief valve (3), water drain valve (7), level indicator drain (9) and foam lling/drain connection
(8) could be piped to a suitable place as dened by the end user/installer.
6. In order to preserve the bladder tank over a long operation period and to avoid migration of the water-foam solution back to the
re water network, a stop valve, a Y-strainer and a check valve (in this order from the pump side to the bladder tank side) are
recommended to be installed upstream the proportioning device (if present).
WARNING
CAUTION
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