Concentrate Piping Ccs; Primary & Thermal Relief Valves - Viking CCS Operating & Maintenance Manual

A metering pressure drop chart is found elsewhere in this manual. As an example, a flow rate of 100 GPM through a 4"
controller results in a MPD of .55 PsI. This is not high enough to overcome even the pressure loss within the tank, so the
controller will proportion on the light side.
However at 150 GPM, the MPD is now 1.2 PsI, which is high enough to overcome the friction loss, assuming the controller
is located in its ideal location, as noted previously. One can now see how moving the controller will create subtle changes
in friction loss, which will require a somewhat higher water flow rate to generate a higher MPD. A smaller controller will
generate a higher pressure drop at the same flow rate as that of the larger controller.
The interconnecting piping should be sized to generate as little friction loss as possible. Avoid tees and elbows wherever
possible, and use full port valves. swing check valves are recommended to prevent water backflow into the bladder.
strainers, while called for by NFPA, are, in our opinion, not necessary when used with AFFF/AR products. Consult the
foam manufacturer or Viking for compatibility of foam concentrates with various pipe and valving materials.
Residual water pressure, flow requirements, and locations are main factors in sizing a controller for installation. A perma-
nent pressure loss chart and a proportioning curve with recommended flow rates are located elsewhere in this manual.
There are numerous ways to design and install an Viking Concentrate Control system for effective operation. Your Viking
representative will be happy to assist in whatever way possible.
Viking does not warrant or represent that this system is adequate for your fire protection needs. You should determine
whether this system is adequate for its intended use, as you assume all risk and liability in connection therewith.
see the Warranty located in the back of this manual.

3.0 CONCENTRATE PiPiNG CCS

In order to prevent the inversion of the concentrate stored in the CCs bladder to the water system, it is recommended
that the concentrate controller be located level with the top discharge of the CCs tank. In addition, a concentrate isola-
tion valve should be installed in the concentrate pipe between the CCs and the concentrate controller for either manual
of automatic systems.
This method of installation prevents the heavier-than-water (AFFF/AR) concentrate from draining or siphoning from the
tank into the water supply piping. The concentrate isolation valve serves as a positive means of separating the concen-
trate from the water supply source, which is required by law in some states.
When the concentrate is not isolated from the water supply, there have been cases where the concentrate has siphoned
out of the bladder and was replaced by supply water, giving the erroneous indication that the bladder has ruptured.
This is very probable when the controller is positioned lower than the top flange of the CCs.
Piping between the CCs and the controller is not normally furnished by Viking, and is the responsibility of the system
design engineer for the type system wanted - manual, automatic electrical, automatic pneumatic, fail-safe, dry, wet, etc.
4.0 PRiMARY AND THERMAL RELiEF vALvES
The design pressure and maximum working pressure for the Viking bladder tank is 175 PsI. It is the responsibility of the
owner or design engineer to provide a primary relief valve to protect the tank from a rapid over-pressurization. Details of
the fire protection systems design must be known, such as water pressure and flow capacity, to size this relief valve.
Thermal expansion of the foam concentrate within the tank can also create pressures exceeding the rated capacity of the
bladder tank. This slow but steady pressure increase could result in problems ranging from leaks at threaded of flanged
connections to physical damage of the bladder or pressure tank.
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