Hale FoamLogix 6.5 - Manual (Page 52)

❑ Installer Installation
52 FoamLogix 3.3 / 5.0 / 6.5 Installer / Operations Manual
p/n: 029-0021-68-0
Foam Concentrate Bypass Hose
The foam concentrate bypass hose connection is 1/2” (13mm) NPT threads.
Hoses and fittings of nominal 1/2” (13mm) inside diameter must be used as
bypass hose. Since the bypass hose is used for calibration and draining the
system it does not see high operating pressures; therefore, a hose with a
lower pressure rating than the inject hose may be used.
Fittings and hoses used must be compatible with all foam agents expected
to be used. Use fittings made of brass or 300 series stainless steel compat-
ible with all foam concentrates.
Recommended Components
❑ Hose: Low pressure hydraulic hose (or air brake tubing. See Note on
preceding page)
❑ Fittings: Brass or stainless steel
It is recommended that the foam concentrate bypass hose be long enough
to extend past the apparatus running board to reach five (5) gallon (19 liter)
containers, making foam pump setup and calibration simpler.
Check Valves
Check valves must be installed on the apparatus to prevent contamination
of the foam concentrate with water and contamination of the fresh water
tank with foam. For a typical system layout, see heading 2.21 “Hale Foam
System Layout Drawings” on page 39.
NFPA standards require a check valve in the foam concentrate injection line
at the injection point. The Hale p/n: 038-1790-00-0 Integral Check Valve/
Injector Fitting, a standard component included with the Hale FoamLogix
3.3, 5.0 or 6.5 system and installed when a manifold kit is ordered, meets
these requirements and threads directly into the foam injection port on Hale
manifolds.
Check valves must be installed in all water piping locations where foam con-
centrate could drain back into pumps or other components of the fire appa-
ratus. As a minimum one check valve must be installed where the water
piping that supplies foam solution connects to the fire pump discharge.
To more effectively keep foam contamination out of the fire pump and water
tank, double check valves should be used. Separate two check valves by at
least 6” to 8” (152 to 203mm) of piping to form a dead zone between the
valves.