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ROTARY GEAR PUMP
ELECTRONIC FOAM PROPORTIONING SYSTEM
Section
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: Installation
The foam pump discharge port and check
valve injector fitting connection port have
½ inch NPT threads. Hoses and fittings of ½
inch (13 mm) minimum inside diameter
rated at 500 PSI (34 BAR) working pressure or
maximum discharge pressure of the fire
pump must be used. Fittings and hoses
must be compatible with all foam agents to
be used.
RECOMMENDED COMPONENTS:
Hose:
Aeroquip 2580-10 or Equivalent
Reinforced Hydraulic Hose.
Fittings: Brass or Stainless Steel Hose End
Crimp or Reusable Type (Aeroquip
412-9-10 or Equivalent)
Although air brake tubing has been used for
foam concentrate discharge hose, it is not
as flexible as the hydraulic hose and readily
kinks during installation. Additionally, the air
brake tubing may not meet NFPA 500 PSI
(34 BAR) test requirements.
FOAM CONCENTRATE BYPASS HOSE
The foam concentrate bypass hose
connection has ½ inch NPT threads. Hoses
and fittings of ½ inch (13 mm) minimum
inside diameter should be used as bypass
hose. Since the bypass hose is used for
calibration and draining the system it will
not see high operating pressures, therefore,
a hose with a lower pressure rating than the
inject hose can 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
compatible with all foam concentrates to
be used.
RECOMMENDED COMPONENTS:
Hose:
Low Pressure Hydraulic Hose or Air
Brake Tubing
Fittings: Brass or Stainless Steel
The foam concentrate bypass hose should
be long enough to extend past the
apparatus running board making foam
pump setup and calibration simpler.
CHECK VALVES
Check valves must be installed on
apparatus with foam systems to prevent
contamination of the foam concentrate
with water and contamination of the fresh
water tank with foam. (Refer to figures 1-1
through 1-5) When a Hale FoamMaster
foam injection system and related
components are properly installed the
required check valves are integral parts of
the component parts.
NFPA standards require a check valve in
the foam concentrate injection line at the
injection point. The foam concentrate
check valve shall have a 4 to 5 PSI (0.28 to
0.34 BAR) cracking pressure to prevent
foam concentrate siphoning from the foam
concentrate tank due to static head
pressure. The check valve shall be rated for
500 PSIG (34 BAR) water pump discharge
pressure. The Hale P/N 038-1790-00-0
Integral Check Valve/Injector fitting, a
standard component included with the
Hale FoamMaster system, 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 concentrate
could drain back into pumps or other
components of the fire apparatus. As a
minimum one check valve must be installed
where the water piping that will supply
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 8 inches (203 mm) of piping to form a
dead zonebetween the check valves.
Individual drain lines should be used on
each check valve. The waterway check
valves must be rated for 500 PSIG (34 BAR)
working pressure.
Hale 3 inch "115" flange type check valves
(Hale P/N 038-1570-00-0) can be used for
most installations on pumps with "115" style
