System Check; Isolating Valves; Maximum Operating Pressure; Relief Valve - Grundfos GT-CF Montage- Und Betriebsanleitung

4.4 System check

The GT tank must be bypassed if the system
pressure exceeds the maximum operating pressure
of the GT tank during a system check.

4.5 Isolating valves

We recommend to install an isolating valve in
connection with the GT tank.
Floor mounting
Fig. 7 Isolating valves

4.6 Maximum operating pressure

The maximum operating pressure of the pump (p2)
plus the actual inlet pressure (p1) must not exceed
the maximum operating pressure of the GT tank (p3).
See fig. 8.
See pump and tank nameplates.
p2
p1
Fig. 8 Maximum operating pressure

4.7 Relief valve

Install a relief valve. Set the relief valve to open at or
below the maximum operating pressure of the GT
tank. This will protect the GT tank and other system
components. The relief valve should be installed at
the connection of the GT tank to the pipe system and
have a discharge equal to the pump capacity at
maximum operating pressure.
Fig. 9 Relief valve
8
Wall mounting
p3
Relief valve

5. Maintenance

The GT tank is a maintenance-free, but we
recommend to check it for damage two times a year:
• Is corrosion visible?
• Are there are any visible scratches, dents, etc.?
In case of serious damage, contact your nearest
Grundfos company.

6. Technical data

See tank nameplate.