19
Installation and Operation Manual
CAUTION: Flexible hose connections are required
between the major FoamPro components and the
main water system. Do not hard plumb the system.
Foam Pump Discharge Relief Valve
The discharge relief valves on the outlet port of the
hydraulically-driven foam pump are preset at the
factory to ensure optimum performance of the
FoamPro AccuMax SP system.
The bypass line from the hydraulically-driven foam
pump relief must return to either the foam concentrate
tank or a minimum of 5 feet from the inlet port of the
foam pump. This will lessen the aerating of the foam in
the event of an over-pressurization of the system.
Calibrate/Inject Valve
The calibrate/inject valve is supplied in the fitting kit
and is to be positioned as shown in Figure 8-1 in the
system. This valve must be accessible by the pump
operator during normal operations. The valve is a 3-
way directional control valve that selects where the
output of the foam system will go.
Check to make sure the valve is installed properly. Look
at the ports as you move the selector handle. The flow
should go from the center port to each of the end ports.
The hoses to and from the valve should be 3/4” (19
mm) for the 3020 and 3040, 1” (25.4mm) for the 3060,
1-1/4” (31.8mm) minimum for the 3090, 1-1/2” (38.1mm)
for the 3150, and 2” (50.8mm) for the 3300 systems
inside diameter, rated at or above 400 PSI (28 Bar)
working pressure. Fittings are to be the same size as
above and made of brass or stainless steel, with the
same minimum pressure rating as the hoses.
The hose(s) from the calibrate side of the valve(s) may
have a lower pressure rating since it is used for system
calibration only and is always vented to the
atmosphere. The hose(s) from this port must be long
enough to reach a container outside the apparatus and
may be coiled for storage when not in use.
Line Strainer
The line strainer(s) provided with the FoamPro
AccuMax SP system are sized properly for most
applications. See Section 4 for further information. The
appropriate strainer is to be installed on the inlet side of
the foam pump. The hose from the foam tank should
have adequate wall stiffness to withstand the vacuum
of the foam pump while it is running without collapsing
[23" Hg (584 mm HG)].
CAUTION: If a pressurized water flush system is
incorporated, the plumbing exposed to this
pressure must be rated at or above the operating
pressure or a minimum of 400 PSI (28 BAR).
Main Waterway Flowmeters
The FoamPro AccuMax SP system is designed to
accept flow reading signals from the FoamPro
paddlewheel-style flowmeter.
Proper flowmeter sizing is critical to system accuracy.
Select a flowmeter size based on actual flows required,
not standard pipe sizes. Refer to the installation
drawing in Section 15 for proper flowmeter sizing.
The flowmeters require that the amount of turbulence
in the pipe being monitored is as low as possible.
Excessive turbulence produces unstable and
inaccurate flow readings. The following installation
guidelines will help attain the best readings and
maintain accuracy of the FoamPro system when using
the FoamPro paddlewheel flowmeter in a tee or in the
FoamPro Manifold.
1. A minimum
5 times the pipe diameter
of straight
run pipe without any fittings is necessary upstream
of the flowmeter.
10 times
is better. The longer the
straight run, the lower the turbulence. The following
are the recommended straight run lengths for given
pipe sizes:
Pipe
Recommended
Size
Straight Run Pipe
1-1/2'' (38 mm)
7-1/2 to 15" (191 to 381 mm)
2" (50 mm)
10 to 20" (254 to 508 mm)
2-1/2" (64 mm)
12-1/2 to 25" (317 to 635 mm)
3" (76 mm)
15 to 30" (381 to 762 mm)
4" (100 mm)
20 to 40" (511 to 1016 mm)
2. The downstream plumbing of the flowmeter is not
as critical, but straight runs without fittings help
maintain accurate flow readings.
3.
Do not mount a flowmeter directly after or
before an elbow or valve
. Valves create severe
turbulence when they are “gated down” as shown
in Figure 8-2.
4. Try to mount the flowmeters in a position that is
accessible for routine inspection and maintenance.
AccuMax SP
