Grundfos CR 3 Vertical Multistage Pump

Vertical, multistage centrifugal pump with suction and discharge ports on the same level. The pump head and base are in cast iron; all other wetted parts are in stainless steel EN 1.4301 (AISI 304). Because the ports share a centreline, the pump drops into a straight pipe run without an offset.

The CR 3 frame is rated at 15.4 GPM. The family number is Grundfos’s nominal duty in cubic metres per hour, not a GPM figure — size the pump from the rated head table below, not from the model number.

18 models are offered, from CR 3-2 to CR 3-25, covering 1/3 to 5 HP on NEMA 56C, 182TC C-face totally enclosed fan-cooled (TEFC) motors. Adding stages raises head at the same flow without changing the footprint. Connections are 1 in NPT oval flanges (rated 232 psi) or 1-1/4 in ANSI 250 lb flanges (rated 362 psi).

• In-line ports — suction and discharge on the same level, so the pump installs in a straight run without an elbow or offset.
• Cast iron head and base, 304 stainless wetted parts — chambers, impellers, shaft and sleeves in EN 1.4301 (AISI 304).
• Cartridge shaft seal — replaced as a complete unit without setting the seal by hand and without special tools.
• Silicon-carbide seal faces — SiC against SiC on both faces in every seal option listed here.
• NSF/ANSI 61 certified for drinking water contact.
• Totally enclosed fan-cooled (TEFC) NEMA C-face motor — 56C, 182TC frames across this range, 60 Hz.
• Two connection styles — 1 in NPT oval flanges (rated 232 psi) or 1-1/4 in ANSI 250 lb flanges (rated 362 psi).

• HQQE — EPDM. Silicon-carbide faces with an EPDM O-ring, rated −4 °F to 248 °F. The standard water seal: potable water, hot water and glycol. Not for mineral oils.
• HQQV — FKM (Viton). Silicon-carbide faces with an FKM O-ring, rated −4 °F to 194 °F. For mineral oils, fuels and liquids that attack EPDM.

In the Grundfos type key the final letter is the rubber: E = EPDM, V = FKM. Both options use silicon-carbide faces (QQ) and the same cartridge format.

• Pressure boosting in commercial buildings, hotels and multi-unit residential
• HVAC heating, chilled water and condenser water circulation
• Irrigation and spray systems
• Water treatment, filtration and reverse osmosis feed
• Industrial process cooling and liquid transfer
• Boiler feed and condensate within the published temperature limits

Each part number is a complete pump: pump end, motor, coupling, coupling guard and shaft seal, factory assembled and tested.

Companion flanges are not included with ANSI flanged pumps and are ordered separately. Oval-flange models include their oval flanges.

Motor starters, variable frequency drives, pressure sensors, base plates, foundation bolts and isolation valves are not included. These are fixed-speed pumps; for integrated variable-speed control see the CRE range.

Select the HP and voltage, then the model, then the connection and seal. Each combination is a distinct Grundfos part number, listed in the table above and shown in the SKU of the selected variant.

Not every combination exists — the picker shows only the combinations Grundfos publishes, and higher stage counts are offered in the ANSI flanged version only.