Grundfos · Split-Coupled End Suction Pump, Variable Speed
NBSE
201 builds in 21 pump sizes: 3 to 30 HP with built-in drive, up to 296 ft of head and 2,491 GPM at full speed.
Up to 296 ft (128 PSI) Head · Up to 2,491 GPM
3-30 HP Variable Speed
Built-In Drive, IE5 Permanent-Magnet MLE Motor
200-240V or 440-480V 3Ph
2-8 in Suction x 1-1/4-6 in Discharge
Class 125 ANSI Flanges
DOE PEI 0.39-0.50
175 PSI Working Pressure
-10 to 284°F Liquid
160-755 lb Ship Weight
Overview
The NBSE is the split-coupled NBS end suction pump with a Grundfos MLE permanent-magnet motor and drive built in, IE5 efficiency, two levels above NEMA Premium. The radially split rigid coupling needs no alignment and lets the seal come out without removing the motor, and the pump takes up to 35% less floor space than a frame-mounted design. The on-board controls run the pump at the speed the system needs: medium-speed builds up to 4000 RPM, low-speed builds up to 2200 RPM.
- With a sensor: constant pressure, differential pressure, proportional pressure, temperature, flow, level or constant curve control
- Sensorless proportional and differential pressure available when ordered and factory-calibrated
- No grouting or laser alignment; double volute on the larger sizes
What Ships and What It Needs to Run
Included: the pump with its MLE motor and built-in drive, split coupling and guard, assembled on support rails.
Ships by freight: 160 to 755 lb shipping weight.
Sized at install: isolating valves, a pressure or differential-pressure sensor where your control mode needs one, and a level base.
Genuine Grundfos equipment, factory-new in original packaging — sold and supported by Watermain Supply, an independent industrial supplier.
12-Month Grundfos Warranty
Covered for 12 months from the date of purchase under Grundfos’s published warranty terms.
Specifications
| Pump type |
Single-stage, end suction, back-pull-out volute pump, split coupled, mechanical shaft seal |
| Motor |
Grundfos MLE permanent-magnet motor with integrated frequency converter, IE5 |
| Speed |
Medium speed up to 4000 RPM or low speed up to 2200 RPM, by build |
| Flanges |
ASME/ANSI B16.1 Class 125; Class 300 ductile iron optional |
| Maximum working pressure |
175 psi (Class 125) |
| Liquid temperature |
-10 to 284°F, by shaft seal |
| Ambient temperature |
104°F and 3,280 ft without derating |
Models & Performance — Will It Do What You Need?
Each line is one pump size at one speed: suction x discharge, motor HP, shut-off head and the largest maximum flow. Open the size that covers your duty point. Each row is one impeller and motor combination at full speed; the drive runs the pump anywhere below that curve. Head in feet.
NBSE 012-070, 4000 RPM: 2 x 1-1/4 in, 3-15 HP, 128-258 ft, 209 GPM
| Impeller, motor |
0 GPM |
105 |
155 |
209 (Max) |
| /6.97, 10 HP |
258 |
231 |
187 |
— |
| /6.97, 15 HP |
257 |
251 |
232 |
172 |
| /6.65, 15 HP |
243 |
236 |
218 |
— |
| /6.10, 7 1/2 HP |
211 |
171 |
112 |
— |
| /5.47, 7 1/2 HP |
170 |
152 |
106 |
— |
| /5.00, 5 HP |
144 |
109 |
— |
— |
| /4.69, 3 HP |
128 |
51 |
— |
— |
NBSE 015-070, 4000 RPM: 2-1/2 x 1-1/2 in, 5-15 HP, 114-269 ft, 333 GPM
| Impeller, motor |
0 GPM |
165 |
250 |
333 (Max) |
| /6.93, 15 HP |
269 |
237 |
176 |
116 |
| /6.73, 10 HP |
256 |
158 |
97 |
— |
| /5.04, 7 1/2 HP |
143 |
120 |
81 |
— |
| /4.49, 5 HP |
114 |
81 |
— |
— |
NBSE 025-070, 4000 RPM: 3 x 2-1/2 in, 7 1/2-30 HP, 113-262 ft, 621 GPM
| Impeller, motor |
0 GPM |
310 |
470 |
621 (Max) |
| /6.77, 25 HP |
262 |
238 |
171 |
— |
| /6.77, 30 HP |
262 |
252 |
203 |
143 |
| /6.77, 20 HP |
262 |
197 |
124 |
— |
| /4.96, 10 HP |
133 |
94 |
— |
— |
| /4.57, 7 1/2 HP |
113 |
64 |
— |
— |
NBSE 025-095, 4000 RPM: 3 x 2-1/2 in, 30-30 HP, 281-281 ft, 572 GPM
| Impeller, motor |
0 GPM |
285 |
430 |
572 (Max) |
| /7.17, 30 HP |
281 |
257 |
197 |
130 |
NBSE 030-070, 4000 RPM: 4 x 3 in, 7 1/2-30 HP, 106-258 ft, 835 GPM
| Impeller, motor |
0 GPM |
420 |
630 |
835 (Max) |
| /6.85, 30 HP |
258 |
206 |
150 |
99 |
| /6.85, 25 HP |
258 |
172 |
113 |
— |
| /5.87, 15 HP |
186 |
94 |
55 |
— |
| /5.39, 10 HP |
140 |
59 |
— |
— |
| /5.04, 7 1/2 HP |
106 |
38 |
— |
— |
NBSE 015-070, 2200 RPM: 2-1/2 x 1-1/2 in, 3-3 HP, 81-81 ft, 211 GPM
| Impeller, motor |
0 GPM |
105 |
160 |
211 (Max) |
| /6.93, 3 HP |
81 |
77 |
57 |
39 |
NBSE 015-090, 2200 RPM: 2-1/2 x 1-1/2 in, 3-5 HP, 164-166 ft, 148 GPM
| Impeller, motor |
0 GPM |
75 |
110 |
148 (Max) |
| /9.84, 5 HP |
166 |
142 |
109 |
78 |
| /9.84, 3 HP |
164 |
85 |
53 |
— |
NBSE 015-095, 2200 RPM: 2-1/2 x 1-1/2 in, 5-10 HP, 135-169 ft, 279 GPM
| Impeller, motor |
0 GPM |
140 |
210 |
279 (Max) |
| /9.84, 10 HP |
169 |
161 |
130 |
92 |
| /9.84, 7 1/2 HP |
169 |
133 |
95 |
— |
| /8.82, 5 HP |
135 |
92 |
64 |
— |
NBSE 020-095, 2200 RPM: 2-1/2 x 2 in, 5-10 HP, 157-157 ft, 328 GPM
| Impeller, motor |
0 GPM |
165 |
245 |
328 (Max) |
| /9.45, 7 1/2 HP |
157 |
122 |
88 |
— |
| /9.45, 5 HP |
157 |
81 |
47 |
— |
| /9.45, 10 HP |
157 |
149 |
119 |
85 |
NBSE 020-110, 2200 RPM: 2-1/2 x 2 in, 5-20 HP, 137-182 ft, 451 GPM
| Impeller, motor |
0 GPM |
225 |
340 |
451 (Max) |
| /10.31, 20 HP |
182 |
173 |
155 |
126 |
| /10.31, 15 HP |
182 |
173 |
127 |
— |
| /9.92, 10 HP |
171 |
129 |
86 |
— |
| /9.92, 7 1/2 HP |
171 |
95 |
— |
— |
| /8.98, 5 HP |
137 |
56 |
— |
— |
NBSE 020-135, 2200 RPM: 3 x 2 in, 7 1/2-15 HP, 169-269 ft, 341 GPM
| Impeller, motor |
0 GPM |
170 |
255 |
341 (Max) |
| /12.52, 15 HP |
269 |
203 |
150 |
92 |
| /11.42, 10 HP |
221 |
144 |
92 |
— |
| /10.16, 7 1/2 HP |
169 |
108 |
— |
— |
NBSE 025-070, 2200 RPM: 3 x 2-1/2 in, 3-5 HP, 74-78 ft, 335 GPM
| Impeller, motor |
0 GPM |
170 |
250 |
335 (Max) |
| /6.77, 5 HP |
78 |
76 |
64 |
46 |
| /6.61, 3 HP |
74 |
53 |
38 |
— |
NBSE 025-095, 2200 RPM: 3 x 2-1/2 in, 3-10 HP, 58-146 ft, 427 GPM
| Impeller, motor |
0 GPM |
215 |
320 |
427 (Max) |
| /9.53, 10 HP |
146 |
129 |
98 |
70 |
| /9.53, 7 1/2 HP |
146 |
99 |
66 |
— |
| /9.13, 5 HP |
136 |
60 |
— |
— |
| /5.98, 3 HP |
58 |
38 |
— |
— |
NBSE 025-110, 2200 RPM: 3 x 2-1/2 in, 7 1/2-20 HP, 153-211 ft, 522 GPM
| Impeller, motor |
0 GPM |
260 |
390 |
522 (Max) |
| /11.02, 20 HP |
211 |
199 |
153 |
106 |
| /9.45, 7 1/2 HP |
153 |
81 |
— |
— |
NBSE 030-070, 2200 RPM: 4 x 3 in, 3-5 HP, 72-77 ft, 479 GPM
| Impeller, motor |
0 GPM |
240 |
360 |
479 (Max) |
| /6.85, 5 HP |
77 |
62 |
46 |
32 |
| /6.85, 3 HP |
72 |
36 |
22 |
— |
NBSE 030-095, 2200 RPM: 4 x 3 in, 5-20 HP, 59-133 ft, 739 GPM
| Impeller, motor |
0 GPM |
370 |
550 |
739 (Max) |
| /8.86, 20 HP |
133 |
133 |
119 |
90 |
| /8.86, 15 HP |
133 |
115 |
89 |
— |
| /8.86, 10 HP |
133 |
82 |
50 |
— |
| /8.27, 7 1/2 HP |
115 |
55 |
— |
— |
| /6.10, 5 HP |
59 |
39 |
21 |
— |
NBSE 030-135, 2200 RPM: 4 x 3 in, 15-30 HP, 176-296 ft, 703 GPM
| Impeller, motor |
0 GPM |
350 |
530 |
703 (Max) |
| /12.91, 30 HP |
296 |
220 |
166 |
111 |
| /11.26, 20 HP |
229 |
156 |
104 |
— |
| /9.92, 15 HP |
176 |
116 |
71 |
— |
NBSE 040-070, 2200 RPM: 5 x 4 in, 3-10 HP, 41-73 ft, 826 GPM
| Impeller, motor |
0 GPM |
410 |
620 |
826 (Max) |
| /6.85, 7 1/2 HP |
73 |
55 |
39 |
— |
| /6.85, 10 HP |
73 |
69 |
54 |
36 |
| /6.30, 5 HP |
61 |
38 |
25 |
— |
| /5.43, 3 HP |
41 |
21 |
— |
— |
NBSE 040-095, 2200 RPM: 5 x 4 in, 10-20 HP, 107-142 ft, 1,109 GPM
| Impeller, motor |
0 GPM |
550 |
830 |
1,109 (Max) |
| /9.37, 20 HP |
142 |
111 |
82 |
56 |
| /8.35, 15 HP |
115 |
83 |
58 |
— |
| /8.35, 10 HP |
107 |
54 |
31 |
— |
NBSE 040-110, 2200 RPM: 5 x 4 in, 15-30 HP, 133-174 ft, 1,047 GPM
| Impeller, motor |
0 GPM |
520 |
790 |
1,047 (Max) |
| /10.08, 25 HP |
174 |
140 |
105 |
— |
| /10.08, 30 HP |
173 |
162 |
124 |
90 |
| /10.08, 20 HP |
173 |
118 |
73 |
— |
| /8.74, 15 HP |
133 |
89 |
52 |
— |
NBSE 040-135, 2200 RPM: 5 x 4 in, 15-20 HP, 145-178 ft, 796 GPM
| Impeller, motor |
0 GPM |
400 |
600 |
796 (Max) |
| /10.24, 20 HP |
178 |
136 |
103 |
68 |
| /9.29, 15 HP |
145 |
100 |
67 |
— |
NBSE 050-070, 2200 RPM: 6 x 5 in, 3-10 HP, 22-74 ft, 1,071 GPM
| Impeller, motor |
0 GPM |
540 |
800 |
1,071 (Max) |
| /6.93, 10 HP |
74 |
55 |
42 |
27 |
| /6.93, 7 1/2 HP |
67 |
42 |
30 |
— |
| /6.85, 5 HP |
50 |
25 |
15 |
— |
| /5.43-4.33, 3 HP |
22 |
12 |
5 |
— |
NBSE 050-095, 2200 RPM: 6 x 5 in, 10-30 HP, 70-131 ft, 1,579 GPM
| Impeller, motor |
0 GPM |
790 |
1,200 |
1,579 (Max) |
| /9.13, 30 HP |
131 |
106 |
84 |
62 |
| /9.13, 25 HP |
131 |
92 |
71 |
— |
| /8.19, 15 HP |
93 |
56 |
33 |
— |
| /7.68, 10 HP |
70 |
34 |
— |
— |
NBSE 050-110, 2200 RPM: 6 x 5 in, 15-30 HP, 101-147 ft, 1,486 GPM
| Impeller, motor |
0 GPM |
740 |
1,100 |
1,486 (Max) |
| /9.61, 30 HP |
147 |
116 |
90 |
62 |
| /8.35, 15 HP |
101 |
60 |
35 |
— |
NBSE 060-095, 2200 RPM: 8 x 6 in, 15-30 HP, 47-97 ft, 2,491 GPM
| Impeller, motor |
0 GPM |
1,250 |
1,850 |
2,491 (Max) |
| /8.90, 30 HP |
97 |
69 |
54 |
34 |
| /8.43, 25 HP |
80 |
58 |
45 |
— |
| /7.95, 20 HP |
62 |
46 |
34 |
— |
| /7.32, 15 HP |
47 |
33 |
24 |
— |
Head in feet at the flow in GPM heading each column: 50% and 75% of the largest curve, then its end. Bold = the last column that curve reaches. Full-speed curves from the MLE pages of the Grundfos data booklet NBS, NBSE, 60 Hz ANSI, digitized and rounded down; curves in the image gallery. PSI = feet ÷ 2.31.
No booklet curve for NBSE 025-070/4.57 at 5 HP, 025-070/6.65 at 15 HP and 025-110/11.02 at 15 HP: email your duty point and we will confirm with Grundfos.
Before You Buy — The Limits That Decide the Fit
| Part number |
Two or three part numbers can share the same printed specs; they differ in factory options. Tell us your control mode and we will confirm the right part number with Grundfos. |
| Liquid |
Clean, thin, non-explosive liquids with no solids or fibers |
| Minimum flow |
At least 10% of the rated flow; never run against a closed valve |
| Power |
3 x 200-240V or 3 x 440-480V, 60 Hz |
| Priming |
Non-self-priming: fill the pump and suction pipe before start |
Applications
Variable-flow heating and chilled water, data center cooling and heat reuse, district heating and cooling, water supply and pressure boosting, process water and light industrial.
Materials of Construction
| Pump housing |
Gray cast iron ASTM Class 35 |
| Impeller |
Stainless steel ASTM A351 CF8 |
| Shaft |
Stainless steel AISI 420 |
| Coupling |
Ductile iron, split design |
| Coupling guard |
Stainless steel AISI 430 |
| O-rings |
EPDM |
