CR, CRI, CRN, CRE, CRIE, CRNE
74
Pumped liquids
Pumped liquids
Thin, non-explosive liquids, not containing solid
particles or fibers. The liquid must not chemically attack
the pump materials. When pumping liquids with a
density and/or viscosity higher than that of water,
oversized motors must be used, if required.
Whether a pump is suitable for a particular liquid
depends on a number of factors of which the most
important are the chloride content, pH value,
temperature and content of chemicals, oils, etc.
Please note that aggressive liquids (e.g. sea water and
some acids) may attack or dissolve the protective oxide
film of the stainless steel and thus cause corrosion. The
CR(E), CRI(E), CRN(E) pump types are suitable for the
following liquids:
CR(E), CRI(E)
• Non-corrosive liquids.
For liquid transfer, circulation and pressure boosting of
cold or hot clean water.
CRN(E)
• Industrial liquids.
In systems where all parts in contact with the liquid
must be made of high-grade stainless steel.
CRT(E)
• Saline liquids.
• Hypochlorites.
• Acids.
For saline or chloride-containing liquids such as sea
water or oxidizing agents such as hypochlorites,
CRT(E) pumps of titanium are available. See separate
product guide on CRT(E).
List of pumped liquids
A number of typical liquids are listed on the following
pages.
Other pump versions may be applicable, but those
stated in the list are considered to be the best choices.
The table is intended as a general guide only, and
cannot replace actual testing of the pumped liquids and
pump materials under specific working conditions.
The list should, however, be applied with some caution
as factors such as
• concentration of the pumped liquid,
• liquid temperature or
• pressure
may affect the chemical resistance of a specific pump
version.
Safety precautions must be made when pumping
dangerous liquids.
Notes
D
Often with additives.
E
Density and/or viscosity differ from that of water.
Allow for this when calculating motor output and pump
performance.
F
Pump selection depends on many factors.
Contact Grundfos.
H
Risk of crystallization/precipitation in shaft seal
1
The pumped liquid highly inflammable.
2
The pumped liquid is combustible.
3
Insoluble in water.
4
Low self-ignition point.
