SQFlex data booklet

Type keys
Helical rotor pumps
Example
Code Explanation
6 Rated flow at 3000 rpm [gpm]
SQF Type range
-2 Number of stages
Centrifugal pumps 4"
Example
Code Explanation
25 Rated flow at 3000 rpm [gpm]
SQF Type range
-3 Number of stages
Centrifugal pumps 3"
Example
Code Explanation
10 Rated flow at 10700 rpm [gpm]
SQF Type range
-160 Total dynamic head [ft] at rated flow
Pumped liquids
SQF pumps are applicable in thin, clean, non-aggressive
and non-explosive liquids that do not contain solid or long-
fibred particles.
pH value: 5-9.
Liquid temperature: 0-40 °C (32-104 °F).
The pump can run at free convection (~ 0 m/s, 0 ft/s) at
maximum 40 °C (104 °F).
Sand content
Maximum sand content: 50 g/m
3
(50 ppm).
A higher sand content considerably reduces the lifespan of
the pump.
Salt content
The table below shows the resistance of stainless steel to
Cl
-
. The values in the table are based on a pumped liquid
with a pH value of 5 to 9.
Stainless steel DIN W.-Nr.
Cl
-
content
[ppm]
Liquid
temperature
[°C (°F)]
DIN W.-Nr AISI
1.4301 304
0-300 < 40 (104)
300-500 < 30 (86)
For additional protection, for instance if the Cl
-
content
exceeds 500 ppm, zinc anodes can be used. See section
Zinc anodes.
Related information
Zinc anodes
Curve conditions
Performance range, SQFlex Solar
The SQFlex Solar performance range in is based on the
following data:
• solar radiation on a tilted surface (tilt angle: 20°)
• H
T
= 6 kWh/m
2
(0.56 kWh/ft
2
) per day
• ambient temperature: 30 °C (85 °F)
• 20° northern latitude.
Performance range, SQFlex Wind
The SQFlex Wind performance range in is based on the
following data:
• average wind speed (measured over a month)
• calculations according to Weibull's factor k=2
• continuous operation over 24 hours.
Specific performance charts
The specific performance charts are based on the following
guidelines:
• All curves show mean values.
• The curves must not be used as guarantee curves.
• The typical deviation is: ± 15 %.
• The measurements are made at a water temperature of
20 °C (68 °F).
• The curves apply to a kinematic viscosity of 1 mm
2
/s (1
cSt). If the pump is used for liquids with a viscosity
higher than water, it reduces the head and increases the
power consumption.
Pressure loss
The QH curves are inclusive of inlet and valve losses at
actual speed.
Related information
Performance range
SQFlex
1
6
Product data