GRUNDFOS · VERTICAL MULTISTAGE CENTRIFUGAL PUMP
CRN 255
Vertical multistage centrifugal pump in 316 stainless steel. 12 models from CRN 255-1-1 to CRN 255-4-1, 60 to 300 HP, 8 in ANSI flanged or Victaulic ports, HQQE or HQQV cartridge shaft seal.
199-909 ft (86-393 PSI) Max Head · 1,756-1,768 GPM Max
60-300 HP
230/460V or 460V 3Ph
8 in ANSI or Victaulic Ports
In-Line Suction and Discharge
NEMA C-Face TEFC Motor
232-580 PSI Max Operating Pressure
1,422-3,682 lb Weight
Overview
Vertical, multistage centrifugal pump with suction and discharge ports on the same level, so it drops into a straight pipe run. Every part in contact with the liquid is high-grade stainless steel (EN 1.4401, AISI 316). The CRN 255 is rated at 1,350 GPM, Grundfos’s nominal duty; size it from the performance table below rather than from the model number.
- 12 models, CRN 255-1-1 to CRN 255-4-1, on NEMA C-face TEFC motors, 60 to 300 HP
- 8 in ANSI flanges (150 lb or 300 lb class by model) or Victaulic-type grooved couplings
- HQQE (EPDM) or HQQV (FKM) cartridge shaft seal with silicon-carbide faces
- Maximum operating pressure 232, 363 or 580 PSI by model and connection
What Ships and What It Needs to Run
Included: the CRN 255 pump end and its NEMA C-face TEFC motor, factory-assembled as one complete pump.
ANSI companion flanges or Victaulic couplings required, ordered separately. On the ANSI and Victaulic versions Grundfos supplies the companion connection as a separate set (flange sets: two flanges, two gaskets, nuts and bolts; Victaulic-type coupling sets: two grooved-end pipe couplings with NPT threaded nipples), sized 8 in.
Suction and discharge piping, valves and controls: sized to your system and ordered separately.
Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
Warranty: 24 months from date of installation, but not more than 30 months from date of manufacture (Grundfos limited warranty). Grundfos repairs or replaces its own product; costs of removal, installation and transportation are not covered, and products sold but not manufactured by Grundfos carry their own manufacturer’s warranty.
Specifications
| Specification |
Value |
| Rated flow at 60 Hz |
1,350 GPM (Grundfos nominal duty) |
| Shut-off head range |
199 to 909 ft (86 to 393 PSI) |
| Motor power range |
60 to 300 HP |
| Supply |
3Ph 230/460V, 460V |
| Motors |
NEMA C-face, TEFC, 2-pole, service factor 1.25; three-phase motors NEMA Premium (IE3) |
| NEMA frames |
364TSC, 405TSD, 444TSD, 445TSD, 447TSD, 449TSD |
| Frequency |
60 Hz |
| Suction and discharge ports |
8 in, in-line |
| Connections |
8 in ANSI flanges, 150 lb or 300 lb class by model; 8 in Victaulic-type grooved (PJE) couplings |
| Maximum operating pressure |
232 PSI / 363 PSI / 580 PSI by model and connection |
| Liquid temperature |
−4 °F to 248 °F with HQQE; −4 °F to 194 °F with HQQV |
| Maximum ambient temperature |
104 °F |
| Pump orientation |
Vertical |
Models & Performance — Will It Do What You Need?
Find the pressure you need at your flow and pick the first model that reaches it. Pressure at flow in PSI, one row per model.
CRN 255-1-1 to CRN 255-4-1 · 12 models · 60 to 300 HP
| Model (HP) |
0 GPM (Shut-off) |
340 GPM |
850 GPM |
1,275 GPM |
1,700 GPM |
| CRN 255-1-1 (60 HP) |
86 |
85 |
78 |
58 |
25 |
| CRN 255-1 (100 HP) |
107 |
104 |
99 |
85 |
59 |
| CRN 255-2-2 (125 HP) |
167 |
170 |
156 |
117 |
45 |
| CRN 255-2-1 (150 HP) |
187 |
189 |
178 |
144 |
79 |
| CRN 255-2 (200 HP) |
209 |
208 |
200 |
173 |
119 |
| CRN 255-3-3 (200 HP) |
249 |
256 |
236 |
177 |
66 |
| CRN 255-3-2 (200 HP) |
268 |
274 |
256 |
203 |
98 |
| CRN 255-3-1 (250 HP) |
290 |
294 |
279 |
232 |
138 |
| CRN 255-3 (250 HP) |
314 |
313 |
300 |
259 |
177 |
| CRN 255-4-3 (250 HP) |
349 |
360 |
335 |
262 |
118 |
| CRN 255-4-2 (300 HP) |
371 |
378 |
356 |
290 |
157 |
| CRN 255-4-1 (300 HP) |
393 |
397 |
377 |
317 |
195 |
Pressure the pump develops at each flow, in PSI, rounded down (feet = PSI × 2.31). Shut-off is Grundfos’s published maximum head for each model. Flow columns are read from the Grundfos 60 Hz curve for each model (water at 68 °F), digitized and rounded down, at 20%, 50% and 75% of 1,700 GPM, the last regular flow every curve in this listing reaches; the curves end at 1,756 to 1,768 GPM. Full curves are in the product images. On CRN 255-2-2, CRN 255-2-1, CRN 255-3-3, CRN 255-3-2, CRN 255-3-1, CRN 255-4-3, CRN 255-4-2, CRN 255-4-1 the curve reads above the published shut-off at low flow (by up to 26 ft); the published shut-off is kept and the flow columns follow the curve. Grundfos’s published duty point sits above its own curve by more than 3% of shut-off on CRN 255-1-1, CRN 255-2-2, CRN 255-3-3, CRN 255-3-2, CRN 255-4-3, CRN 255-4-1 (by up to 34 ft at the rated flow); the table follows the curve.
Before You Buy — The Limits That Decide the Fit
| Check |
What decides the fit |
| Duty point |
The model’s pressure at your flow must cover the system’s total head; shut-off is the most it can make, at zero flow. |
| Working pressure |
Inlet pressure plus the pressure the pump adds must stay within the model’s maximum operating pressure: 232, 363 or 580 PSI by model and connection. |
| Liquid temperature |
−4 °F to 248 °F with HQQE; −4 °F to 194 °F with HQQV. |
| Power |
Three-phase supply at the voltage shown in the selected option. |
| Connections |
ANSI companion flanges or Victaulic couplings (8 in) ordered separately. |
| Shaft seal |
HQQE has EPDM rubber parts and HQQV has FKM; choose the rubber that suits the pumped liquid. |
Applications
HVAC heating and air conditioning, district heating and cooling, plumbing pressure boosting, industrial water supply and transfer, process liquids, wash and clean, water treatment, irrigation and ground water transfer (Grundfos CR range applications).
Materials of Construction
| Component |
Material |
| Pump head and base |
Stainless steel ASTM A351 CF8M |
| All other wetted parts |
Stainless steel EN 1.4401 (AISI 316) |
| Flange rings and base plate (ANSI versions) |
Cast iron, not in contact with the pumped liquid |
| Bearings |
Tungsten carbide (WC/WC); Graflon support bearing |
| Shaft seal faces |
Silicon carbide / silicon carbide (HQQ cartridge seal) |
| Seal and gasket rubber |
EPDM (HQQE) or FKM (HQQV) |
