GRUNDFOS · VERTICAL MULTISTAGE PUMP END
CRI 1s Pump End
Vertical multistage pump end in 304 stainless steel, motor not included. 19 models from CRI 1s-2 to CRI 1s-27 for 1/3 to 2 HP NEMA 56C motors, 1 in NPT oval-flanged or 1 1/4 in ANSI flanged ports, HQQE or HQQV cartridge shaft seal.
53-746 ft (23-323 PSI) Max Head · 5.6-5.7 GPM Max
Fits 1/3-2 HP NEMA 56C Motors
1 in NPT Oval or 1 1/4 in ANSI Ports
In-Line Suction and Discharge
363 PSI Max Operating Pressure
NSF/ANSI 61
25.1-55.8 lb Weight
Overview
The CRI 1s pump end is the hydraulic part of a Grundfos CRI 1s vertical multistage pump, supplied without a motor: order it to rebuild an existing CRI 1s, to change the number of stages for a new duty, or to build a pump on a motor you already have. All wetted parts are stainless steel (EN 1.4301, AISI 304). Suction and discharge sit on the same level, so it drops into a straight pipe run. The CRI 1s is rated at 4.84 GPM (Grundfos nominal duty); size it from the performance table below rather than from the model number.
- 19 models, CRI 1s-2 to CRI 1s-27, each built for a NEMA 56C C-face motor of 1/3 to 2 HP (motor table below)
- oval flanges tapped 1 in NPT, included, fitted to the FlexiClamp pump base (Grundfos type CA) (CRI 1s-2 to CRI 1s-17); or 1 1/4 in ANSI flanges, 300 lb, with a cast iron flange and base plate that do not touch the liquid (CRI 1s-2 to CRI 1s-27)
- HQQE (EPDM) or HQQV (FKM) cartridge shaft seal with silicon-carbide faces
- Maximum operating pressure: 363 PSI
What Ships and What It Needs to Run
Included: the CRI 1s pump end and the motor coupling (Grundfos price list). Oval-flange versions include the two threaded oval flanges (1 in NPT), bolts and gaskets, fitted to the FlexiClamp pump base.
Motor required, ordered separately. A NEMA C-face motor at the horsepower and frame shown for your model in the motor table under Models & Performance (1/3 to 2 HP, 56C), with the starter or drive that motor needs.
ANSI companion flanges required, ordered separately. Grundfos supplies the companion connections for the ANSI versions as a separate 1 1/4 in set (Grundfos price list).
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 |
| Product |
Pump end only: hydraulic assembly and motor coupling, motor not included |
| Rated flow at 60 Hz |
4.84 GPM (Grundfos nominal duty) |
| Shut-off head range |
53 to 746 ft (23 to 323 PSI) |
| Motor required |
NEMA C-face, 1/3 to 2 HP, frame 56C (by model, see motor table) |
| Suction and discharge ports |
In-line; 1 in NPT or 1 1/4 in |
| Connections |
Oval flanges tapped 1 in NPT (included) on the FlexiClamp base (Grundfos type CA); 1 1/4 in ANSI flanges, 300 lb, cast iron flange and base plate |
| Maximum operating pressure |
363 PSI |
| Liquid temperature |
−4 °F to 248 °F with HQQE; −4 °F to 194 °F with HQQV |
| Shaft seal |
HQQE (EPDM) or HQQV (FKM) cartridge seal, SiC/SiC faces |
| Pump orientation |
Vertical |
| Frequency |
60 Hz |
| App |
None: a mechanical pump end with no electronics |
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.
CRI 1s-2 to CRI 1s-13 · 12 models
| Model |
0 GPM (Shut-off) |
1.1 GPM |
2.8 GPM |
4.1 GPM |
5.5 GPM |
| CRI 1s-2 |
23 |
24 |
22 |
19 |
15 |
| CRI 1s-3 |
36 |
35 |
32 |
28 |
23 |
| CRI 1s-4 |
48 |
48 |
44 |
38 |
30 |
| CRI 1s-5 |
60 |
59 |
54 |
47 |
37 |
| CRI 1s-6 |
72 |
71 |
65 |
58 |
45 |
| CRI 1s-7 |
84 |
81 |
73 |
63 |
49 |
| CRI 1s-8 |
96 |
92 |
82 |
70 |
53 |
| CRI 1s-9 |
108 |
106 |
97 |
84 |
65 |
| CRI 1s-10 |
119 |
116 |
104 |
89 |
67 |
| CRI 1s-11 |
131 |
128 |
117 |
103 |
80 |
| CRI 1s-12 |
142 |
138 |
123 |
105 |
78 |
| CRI 1s-13 |
158 |
151 |
136 |
116 |
87 |
CRI 1s-15 to CRI 1s-27 · 7 models
| Model |
0 GPM (Shut-off) |
1.1 GPM |
2.8 GPM |
4.1 GPM |
5.5 GPM |
| CRI 1s-15 |
181 |
172 |
153 |
130 |
97 |
| CRI 1s-17 |
207 |
202 |
181 |
156 |
119 |
| CRI 1s-19 |
230 |
224 |
200 |
172 |
131 |
| CRI 1s-21 |
254 |
246 |
219 |
188 |
142 |
| CRI 1s-23 |
277 |
267 |
238 |
203 |
153 |
| CRI 1s-25 |
301 |
297 |
276 |
248 |
204 |
| CRI 1s-27 |
323 |
322 |
298 |
265 |
213 |
Pressure the pump end develops at each flow, in PSI, rounded down (feet = PSI × 2.31), with the motor shown in the motor table. 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 about 20%, 50% and 75% of 5.5 GPM, the last regular flow every curve in this listing reaches; the curves end at 5.6 to 5.7 GPM. Full curves are in the product images. The CRI 1s-2 curve reads 57 ft at zero flow against 53 ft published; the published shut-off is shown and the flow columns follow the curve.
Motor each model needs (Grundfos price list; the motor is ordered separately):
| Model |
Motor HP |
NEMA frame |
| CRI 1s-2 |
1/3 |
56C |
| CRI 1s-3 |
1/3 |
56C |
| CRI 1s-4 |
1/3 |
56C |
| CRI 1s-5 |
1/3 |
56C |
| CRI 1s-6 |
1/2 |
56C |
| CRI 1s-7 |
1/2 |
56C |
| CRI 1s-8 |
1/2 |
56C |
| CRI 1s-9 |
3/4 |
56C |
| CRI 1s-10 |
3/4 |
56C |
| CRI 1s-11 |
3/4 |
56C |
| CRI 1s-12 |
3/4 |
56C |
| CRI 1s-13 |
1 |
56C |
| CRI 1s-15 |
1 |
56C |
| CRI 1s-17 |
1-1/2 |
56C |
| CRI 1s-19 |
1-1/2 |
56C |
| CRI 1s-21 |
1-1/2 |
56C |
| CRI 1s-23 |
1-1/2 |
56C |
| CRI 1s-25 |
2 |
56C |
| CRI 1s-27 |
2 |
56C |
Before You Buy — The Limits That Decide the Fit
| Check |
What decides the fit |
| Motor |
Order a NEMA C-face motor at the HP and frame Grundfos lists for your model in the motor table under Models & Performance. |
| 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 maximum operating pressure: 363 PSI. |
| Liquid temperature |
−4 °F to 248 °F with HQQE; −4 °F to 194 °F with HQQV. |
| Connections |
ANSI companion flanges (1 1/4 in) ordered separately; oval-flange versions ship with 1 in NPT flanges. Match the connection to the existing pipework. |
| 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 |
| All wetted parts |
Stainless steel EN 1.4301 (AISI 304) |
| Flange and base plate (ANSI versions) |
Cast iron, not in contact with the pumped liquid |
| Bearings |
Silicon carbide |
| Shaft seal faces |
Silicon carbide / silicon carbide (HQQ cartridge seal) |
| Seal and gasket rubber |
EPDM (HQQE) or FKM (HQQV) |
