GRUNDFOS · VERTICAL MULTISTAGE CENTRIFUGAL PUMP
CRN 125
Vertical multistage centrifugal pump in 316 stainless steel. 660 GPM rated flow at 60 Hz, 22 models from CRN 125-1-1 to CRN 125-9-3, 20 to 200 HP, TEFC motor, HQQE or HQQV cartridge seal, 6 in ANSI flanged or Victaulic ports.
660 GPM Rated Flow
Up to 1,280 ft Shut-off Head
20 to 200 HP
NSF/ANSI 61
316 Stainless Steel
Overview
Vertical, multistage centrifugal pump with suction and discharge ports on the same level, so it drops into a straight pipe run. Pump head and base are cast 316 stainless steel (ASTM A351 CF8M) with AISI 316 chambers, impellers and shaft; the cast iron loose flange rings and base plate do not touch the pumped liquid.
The CRN 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.
22 models are offered, from CRN 125-1-1 to CRN 125-9-3, covering 20 to 200 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), or 6 in Victaulic-type grooved couplings.
Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
What Ships and What It Needs to Run
Each part number is a complete pump: pump end, motor, coupling, coupling guard and cartridge shaft seal, factory assembled.
Not included: ANSI companion flanges or Victaulic couplings (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. Grundfos requires the 100, 125, 150, 200 HP models to be started through a soft starter or variable speed drive. These are fixed-speed pumps; for integrated variable-speed control see the CRE range.
Specifications
| Specification |
Value |
| Rated flow at 60 Hz |
660 GPM |
| Shut-off head range |
120 to 1,280 ft |
| Motor power range |
20 to 200 HP |
| Motors |
NEMA C-face, TEFC, 2-pole, service factor 1.25 |
| NEMA frames |
256TC, 284TSC, 286TSC, 324TSC, 326TSC, 364TSC, 365TSC, 405TSD, 444TSD, 445TSD, 447TSD |
| 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), or 6 in Victaulic-type grooved couplings |
| Maximum operating pressure |
232 psi / 363 psi / 580 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 |
Performance — Will It Do What You Need
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.
Performance table — all models
| Model |
HP |
20% flow |
50% flow |
75% flow |
Shut-off head |
| CRN 125-1-1 |
20 |
171 gpm · 123 ft |
428 gpm · 109 ft |
641 gpm · 81 ft |
120 ft |
| CRN 125-1 |
25 |
171 gpm · 157 ft |
428 gpm · 145 ft |
641 gpm · 121 ft |
165 ft |
| CRN 125-2-2 |
30 |
171 gpm · 236 ft |
428 gpm · 217 ft |
641 gpm · 162 ft |
231 ft |
| CRN 125-2-1 |
40 |
172 gpm · 273 ft |
430 gpm · 256 ft |
646 gpm · 204 ft |
278 ft |
| CRN 125-2 |
50 |
172 gpm · 313 ft |
430 gpm · 295 ft |
645 gpm · 247 ft |
321 ft |
| CRN 125-3-2 |
60 |
173 gpm · 388 ft |
432 gpm · 368 ft |
647 gpm · 288 ft |
391 ft |
| CRN 125-3-1 |
75 |
173 gpm · 428 ft |
432 gpm · 406 ft |
647 gpm · 330 ft |
433 ft |
| CRN 125-3 |
75 |
172 gpm · 469 ft |
430 gpm · 445 ft |
646 gpm · 372 ft |
476 ft |
| CRN 125-4-2 |
75 |
172 gpm · 542 ft |
430 gpm · 515 ft |
645 gpm · 411 ft |
544 ft |
| CRN 125-4-1 |
100 |
172 gpm · 583 ft |
430 gpm · 555 ft |
646 gpm · 455 ft |
588 ft |
| CRN 125-4 |
100 |
172 gpm · 624 ft |
430 gpm · 592 ft |
644 gpm · 495 ft |
630 ft |
| CRN 125-5-2 |
100 |
172 gpm · 695 ft |
429 gpm · 660 ft |
644 gpm · 532 ft |
697 ft |
| CRN 125-5-1 |
125 |
173 gpm · 743 ft |
432 gpm · 709 ft |
649 gpm · 586 ft |
746 ft |
| CRN 125-5 |
125 |
173 gpm · 784 ft |
432 gpm · 747 ft |
648 gpm · 627 ft |
788 ft |
| CRN 125-6-2 |
125 |
173 gpm · 857 ft |
432 gpm · 818 ft |
648 gpm · 666 ft |
857 ft |
| CRN 125-6-1 |
150 |
173 gpm · 899 ft |
432 gpm · 859 ft |
649 gpm · 711 ft |
901 ft |
| CRN 125-6 |
150 |
173 gpm · 941 ft |
432 gpm · 898 ft |
647 gpm · 754 ft |
944 ft |
| CRN 125-7-2 |
150 |
173 gpm · 1,013 ft |
432 gpm · 968 ft |
647 gpm · 793 ft |
1,013 ft |
| CRN 125-7 |
200 |
173 gpm · 1,098 ft |
432 gpm · 1,052 ft |
649 gpm · 884 ft |
1,101 ft |
| CRN 125-8-2 |
200 |
173 gpm · 1,174 ft |
432 gpm · 1,122 ft |
649 gpm · 923 ft |
1,170 ft |
| CRN 125-8 |
200 |
173 gpm · 1,255 ft |
432 gpm · 1,198 ft |
648 gpm · 1,008 ft |
1,255 ft |
| CRN 125-9-3 |
200 |
173 gpm · 1,286 ft |
432 gpm · 1,231 ft |
648 gpm · 1,004 ft |
1,280 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.
Materials
| Component |
Material |
| Pump head and base |
Stainless steel AISI 316 (ASTM A351 CF8M); cast iron flange rings and base plate, not wetted |
| Chambers and impellers |
Stainless steel AISI 316 |
| Shaft |
Stainless steel AISI 316 |
| Shaft seal faces |
Silicon carbide / silicon carbide |
| Seal and gasket rubber |
EPDM (HQQE) or FKM (HQQV) |
| Bearing |
Silicon carbide |
-
HQQE — EPDM. Silicon-carbide faces with EPDM rubber, −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 FKM rubber, −4 °F to 194 °F. For mineral oils, fuels and liquids that attack EPDM.
Before You BuyConfirm the duty point against the performance table, and confirm horsepower, voltage and motor enclosure against your site. Check that liquid temperature and system pressure sit inside the limits for the seal and connection selected, and order 6 in ANSI companion flanges or Victaulic couplings separately.
