To prevent or lessen the effect of thermal expansion, we recommend the following:
A. Avoid filling the tank with cold concentrate. Allow the concentrate to warm to room temperature, if possible.
B. Do not fill beyond the tank’s rated capacity. All Viking bladder tanks have 5-10% extra capacity for expansion.
C. Install a sun canopy over tanks installed outdoors.
D. Install a thermal relief valve.
Viking recommends that only tanks installed “normally un-pressurized” have these relief valves. This type of installation,
while completely acceptable, is most likely to experience the effects of thermal expansion should the tank be filled to
capacity with foam concentrate.
We do not recommend using thermal relief valves on bladder tanks installed “normally pressurized”, such as in wet pipe
systems. These installations frequently have fire pumps that cycle on and off, creating pressure spikes which can result
in frequent discharges of foam concentrate through the relief valve. It is the responsibility of the owner or design engineer
to determine:
E. If these pressure spikes can occur; and
F. If a device or method is required to protect the tank and/or water piping and valves from over-pressurization.
Experience has shown that the water surrounding the bladder is a pressurized installation creates its own cushion against
thermal expansion of the foam concentrate, eliminating the need for the thermal relief valve.
Viking can provide a thermal relief valve that is compatible for this service. Refer to our schematic diagram for its recom-
mended locations. Please specify when ordering whether the tank will be installed pressurized or not.
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