Pulsafeeder Pre-Engineered Skid Systems - Manual (Page 8)

Pre-Engineered Skid Systems
Installation, Operation and Maintenance Manual
PES00039, Rev. B System Overview Page 8
Supply Side, Continued
Process Side
The injection point in the served process or system must be higher than the top of the Solution Supply
Tank to prohibit gravity feeding unless suitable backpressure is always present at the injection point.
In applications where the injection point is below the Solution Supply Tank (example – injection into a
well) or where the injection point may be at reduced pressure (example – injection into the suction side
of a pump), installation of an anti-siphon valve in the process feed line will prevent gravity feeding.
Note: For some applications where air or gas may form in the suction line, this may interrupt flow.
In this case, it may be desirable to add a “Proof of Flow” device on the process side to alert if chemical
injection flow is somehow interrupted. Contact your Pulsafeeder distributor.
Continued…….
Suction Lift
This is the most common arrangement for
chemical metering applications since there is
less chance of spillage.
Note that the maximum recommended lift is 5
feet (1.5m).
Since the Supply Line will be in a vacuum
condition, attention should be paid to the vapor
pressure of the pumped liquid. Vapor
formation in the Supply Line will prevent the
pump from pumping.
Supply Line should gradually slope up to the
Skid Suction Connection to prevent air
pocket(s) which can impede flow.
It is strongly recommended to add a drain
provision on the suction side to facilitate
emptying and flushing of the system for
maintenance.
1-2 inches
(2-5 cm)
Skid
Suction
Connection
Solution
Tank
Supply
Line
Figure 4
Suction Lift
Skid Outlet
Connection
Pump
Pressure
Relief
Valve
5 ft, Max.
(1.5 m)
Ceramic Weight with
Foot Valve, Strainer
Drain