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Vertical, multistage centrifugal pump with suction and discharge ports on the same level, so it drops into a straight pipe run. The pump head and base are ductile cast iron (ASTM A536 65-45-12); chambers, impellers and shaft are stainless steel AISI 304.
The CR 125 frame is rated at 660 GPM. The family number is Grundfos’s nominal duty in cubic metres per hour, not a GPM figure — size the pump from the performance table below, not from the model number.
9 models are offered, from CR 125-1-1 to CR 125-4-2, covering 20 to 75 HP on NEMA C-face TEFC motors (three-phase). Models with a -1, -2 or -3 suffix use that many reduced-diameter impellers to trim head between full stage counts. Connections are 6 in ANSI flanges (150 lb or 300 lb class, by model).
Each part number is a complete pump: pump end, motor, coupling, coupling guard and cartridge shaft seal, factory assembled.
Not included: ANSI companion flanges (6 in) — order separately. Motor starter or VFD, overload protection, pressure switch or sensor, isolation valves, check valve and foundation bolts are also not included.
To run it needs: a three-phase supply matching the motor voltage shown in the selected option, a correctly sized starter with overload protection, flooded suction or adequate NPSH, and a level, rigid foundation. These are fixed-speed pumps; for integrated variable-speed control see the CRE range.
| Specification | Value |
|---|---|
| Rated flow at 60 Hz | 660 GPM |
| Shut-off head range | 120 to 544 ft |
| Motor power range | 20 to 75 HP |
| Motors | NEMA C-face, TEFC, 2-pole, service factor 1.25 |
| NEMA frames | 256TC, 284TSC, 286TSC, 324TSC, 326TSC, 364TSC, 365TSC |
| Frequency | 60 Hz, 2-pole (about 3,500 rpm) |
| Suction and discharge port | 6 in, in-line |
| Connection | 6 in ANSI flanges (150 lb or 300 lb class, by model) |
| Maximum operating pressure | 232 psi / 363 psi depending on model and connection |
| Liquid temperature range | −4 °F to 248 °F with HQQE; −4 °F to 194 °F with HQQV |
| Maximum ambient temperature | 104 °F |
| Pump orientation | Vertical |
| Approvals | NSF/ANSI 61 (HQQE seal versions), NSF/ANSI 372 |
| Curve tolerance | ISO 9906:2012 grade 3B |
Find the head you need in feet at your flow and pick the first model that meets it. Points are read from the Grundfos 60 Hz curve for each model at 20%, 50% and 75% of its maximum flow; shut-off is the head at zero flow, not a working point.
| Model | HP | 20% flow | 50% flow | 75% flow | Shut-off head |
|---|---|---|---|---|---|
| CR 125-1-1 | 20 | 171 gpm · 123 ft | 428 gpm · 109 ft | 641 gpm · 81 ft | 120 ft |
| CR 125-1 | 25 | 171 gpm · 157 ft | 428 gpm · 145 ft | 641 gpm · 121 ft | 165 ft |
| CR 125-2-2 | 30 | 171 gpm · 236 ft | 428 gpm · 217 ft | 641 gpm · 162 ft | 231 ft |
| CR 125-2-1 | 40 | 172 gpm · 273 ft | 430 gpm · 256 ft | 646 gpm · 204 ft | 278 ft |
| CR 125-2 | 50 | 172 gpm · 313 ft | 430 gpm · 295 ft | 645 gpm · 247 ft | 321 ft |
| CR 125-3-2 | 60 | 173 gpm · 388 ft | 432 gpm · 368 ft | 647 gpm · 288 ft | 391 ft |
| CR 125-3-1 | 75 | 173 gpm · 428 ft | 432 gpm · 406 ft | 647 gpm · 330 ft | 433 ft |
| CR 125-3 | 75 | 172 gpm · 469 ft | 430 gpm · 445 ft | 646 gpm · 372 ft | 476 ft |
| CR 125-4-2 | 75 | 172 gpm · 542 ft | 430 gpm · 515 ft | 645 gpm · 411 ft | 544 ft |
Read from Grundfos published 60 Hz curves (water at 68 °F); actual head varies slightly with motor speed. For a duty between two models, email us and we will size it against the full curve.
| Component | Material |
|---|---|
| Pump head and base | Ductile cast iron, ASTM A536 65-45-12 |
| Chambers and impellers | Stainless steel AISI 304 |
| Shaft | Stainless steel AISI 304 |
| Shaft seal faces | Silicon carbide / silicon carbide |
| Seal and gasket rubber | EPDM (HQQE) or FKM (HQQV) |
| Bearing | Silicon carbide |
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