Technical Data - Grundfos SL Instructions Manual

11. Technical data

pH value
Pumps in permanent installations can cope with the following pH values:
Material variant
1)
Standard
1) Cast iron impeller, pump housing and motor top.
Density and viscosity of the pumped liquid
3
Density: 1000 kg/m .
Kinematic viscosity: 1 mm
When pumping liquids with a density and/or a kinematic viscosity higher than the values stated
above, use motors with correspondingly higher outputs.
Flow rate
Keep a minimum flow rate to avoid sedimentation in the pipe network. Recommended minimum flow rates:
• in vertical pipes: 0.7 m/s.
• in horizontal pipes: 1.0 m/s.
Ambient temperature
The ambient temperature may exceed 40 °C for a short period (maximum 3 minutes).
Liquid temperature
0 to +40 °C.
The liquid temperature may be up to 60 °C for a short period (maximum 3 minutes).
Operating mode
The pumps are designed for continuous operation.
Installation depth
Maximum 30 m below liquid level.
Enclosure class
IP68.
Sound Pressure
Use hearing protection when working nearby an installation in operation with a sound pressure level
above 70 dB(A).
Motor liquid
The motor is factory-filled with Grundfos SML3 motor liquid which is frost-resistant until -20 °C. The motor liquid
helps to transfer the heat generated by the motor to the cooling chamber and to the pumped liquid to pass on
the outside of the pump.
Electrical data
The supply voltage and frequency are marked on the nameplate.
The voltage tolerance at the motor terminals must be within ± 10 % of the rated voltage.
Maximum number of starts per hour
30.
32
Installation
Submerged
2
/s (1 cSt).
pH value
1)
6-14