Operating Conditions - Grundfos SL1 Manual De Instrucciones

3.4 Operating conditions

The Grundfos SL1 and SLV pumps are suitable for the following
operating situations:
• S1 operation (continuous operation), the pump must always
be covered by the pumped liquid to the top of the motor.
See fig. 2.
• S3 operation (intermittent operation), the pump must always
be covered by the pumped liquid up to the top of the cable
entry. See fig. 2.
For further information about S1 and S3 operation, see section
10.2 Operating modes.
Fig. 2 Stop levels
pH value
SL1 and SLV pumps in permanent installations can be used for
pumping liquids with the following pH values:
Pump Material
Material
type variant
Cast iron impeller and pump
SL1/SLV Standard
housing
Stainless steel impeller and
SLV Q
cast iron pump housing
1)
For fluctuating pH values, the range is pH 4 to 14.
6
S1 operation
S3 operation
pH value
1)
6.5 to 14
1)
6 to 14
Liquid temperature
32 °F to +104 °F (0 °C to + 40 °C).
For short periods (maximum 3 minutes) a temperature of up to
+140 °F (+60 °C) is permissible (non-FM versions only).
Warning
FM
Explosion-proof pumps must never pump liquids
of a temperature higher than +104 °F (+40 °C).
Ambient temperature
Warning
FM
For explosion-proof pumps, the ambient
temperature on the installation site must be in
the range from -4 °F to +104 °F (-20 °C to +40 °C).
For explosion-proof pumps with WIO sensor, the
ambient temperature at the installation site must
be in the range from 32 °F to +104 °F (0 °C to
+40 °C).
For non-explosion proof pumps, the ambient temperature may
exceed +104 °F (+40 °C) for a short period (max. 3 minutes).
Density and viscosity of pumped liquid
When pumping liquids with a density and/or a kinematic viscosity
higher than that of water, use motors with correspondingly higher
outputs.
Flow velocity
It is advisable to keep a minimum flow velocity to avoid
sedimentations in the piping system. Recommended flow
velocities:
- in vertical pipes: 2.3 ft/s (0.7 m/s)
- in horizontal pipes: 3.3 ft/s (1.0 m/s)
Free spherical passage
From 2" to 4" (50 to 100 mm), depending on pump size.
Operating mode
Maximum 20 starts per hour.