1
Contents

Performance range
Fire NKF
2

Product description
Grundfos Fire NKF sprinkler pump systems are typically used in firefighting applications for supplying water to fire hose reels, fire hydrants or sprinkler systems.
This data booklet covers sprinkler pump systems with electrically and diesel-powered NKF end-suction pumps.
Designations
Fire NKF is an NKF end-suction pump with coupling and motor or engine mounted on a common base frame.
The sprinkler pump system can be incorporated into a firefighting system.
The products in this data booklet have been built to comply with EN standards on water-based firefighting systems described in the following documents:
• EN 12845: Fixed firefighting systems. Automatic sprinkler systems. Design, installation and maintenance.
• prEN 12259-12: Fixed firefighting systems. Pumps for sprinkler and water spray systems.
Fire NKF pumps
Grundfos NKF pumps according to EN 12845 and prEN 12259-12 are designed for the distribution of water in stationary sprinkler systems using water spray.
They are operated in case of fire and during tests.
Materials
Requirements to pump materials according to
EN 12845 and prEN 12259-12:
• Impeller and wear rings must be made of bronze.
• Wet parts such as shaft, washers and nuts must be made of stainless steel.
• Cast parts must be made of cast iron.
Fire NKF
3

4
Product description
Fire NKF
Type: part No.
serial No.
Fire NKF 80-250/270-E-F-X-D-B-A-B
96157421
123456789
Main Supply: impeller diameter:
Q:
P2:
IP
150
55
55 kW
Made in Germany P1
3X400V 50Hz
270
H: n:
G:
112
2940
346
0640 m min -1 kg
-G
Fig. 1 Example of nameplate
Type key for sprinkler pump system
Example Fire NK F 80 -250 /270 E F X D B A B
Fire: Grundfos fire systems
Pump type
NK
Pump approved for firefighting
Nominal diameter of discharge port
80 mm
Pump housing size
250 mm
Actual impeller diameter
270 mm
Driver
D: Diesel engine
E: Electric motor, 50 Hz
Approval of pump
G: According to prEN 12259-12
Approval of fire pump set
X: No approval
Pipe connections
D: DIN
Control panel
B: On base frame
W: Seperate (e.g. prepared for wall mounting)
X: Without controller
Shaft seal
A: BAQE
Coupling
A: Standard
B: Spacer
F: Flexible coupling (Centaflex)
Fig. 2 Example of nameplate
Type key for pump
Example NKF 65 -200 /219 AH -F -B -BAQE -G
Type range
NKF
Nominal diameter of discharge port
65 mm
Nominal impeller diameter
200 mm
Actual impeller diameter
219 mm
Code for pump version
AH: NKF bare shaft pump
A2: NKF basic version with spacer coupling
Code for pipework connection
F: DIN flange
Code for materials
B: EN-GJL-250 with bronze impeller
Code for mechanical shaft seal and rubber pump parts
Approval of pump
G: According to prEN 12259-12

Product description
Fire NKF
EN 12845 and prEN 12259-12 require stable QH characteristics. The total head declines with increasing flow rate.
35
30
25
20
65
ø219
60
ø207
55
50
ø194
45
40 ø170
15
10
5
0
0
0
200
20
400
22 kW
18.5 kW
15 kW
11 kW
600
40
800
NKF 50-200
2-pole, 50 Hz
2950/3000 rpm
ISO 9906 Annex A
ISO 9906 Annex A
1000 1200 1400 1600 1800 2000
60 80 100 120
Q [l/min]
Q [m³/h]
24
20
16
12
ø219
ø194
ø207
ø170
8
4
ø170 (NPSH)
0
0 200 400 600 800 1000 1200 1400 1600 1800 2000
Fig. 3 Example of curve charts
ø219 (NPSH) 20
10
Q [l/min]
0
An orifice plate can be included where the maximum flow from the pump is critical (for determining the stored water capacities). The effect of an orifice plate is to throttle the pump curve and provide a steeper fall-off in performance. This does, however, result in power losses through loss of pump efficiency.
Impellers can be trimmed to provide a tailor-made pump curve. This means that the closed-valve pressure, power demand and potential maximum flow rate from the pump are optimised to suit specific duty requirements.
The electric motor is a 2-pole MMG motor complying with local standards for electric motors. As from 16 July
2011, the motors used in Europe will be IE2 = EFF 1 motors.
Fig. 4 Fire NKF: An NKF end-suction pump with electric motor and controller mounted on a base frame
Insulation class: F.
Enclosure class: IP55.
The diesel engine can operate continuously at full load at site elevation with rated output in accordance with
ISO 3046-1:1986. The pump is at full operational speed within 15 seconds; the engine is capable of starting at a room temperature of 5 °C.
Fig. 5 Fire NKF: An NKF end-suction pump with diesel engine and controller mounted on a base frame
Each complete engine and pump unit is tested on the manufacturers test bed for at least 1.5 hours at rated flow rate, and the result is recorded on the test certificate.
5

6
Product description
Fire NKF
To ensure that the motor (electric motor or diesel engine) is capable of operating the pump at any time, to ensure water supply, EN 12845 and prEN 12259-12 stipulate an excess capacity of motor power.
According to EN 12845 and prEN 12259-12, the motor power is found at 16 m NPSH. The example below shows a required motor size of 22 kW.
P2
24
20
16
12
P2 required
ø207
ø194
ø219
ø170
8
4
ø170 (Min. NPSH) ø219 (Max. NPSH)
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 Q [m³/h]
12
8
4
0
NPSH
20
16
Fig. 6 Required and stipulated power
Grundfos offers a complete, factory-assembled controller in a steel plate cabinet, suitable for wall mounting or free-standing.
The controller complies with the standard EN 12845.
The controller for pumps with electric motor can be mounted on the wall or on the base frame.
The controller for diesel-powered pumps is always mounted on the base frame.
Functions
The starting signal for the fire pump is given via two redundant pressure switches. The fire pump can only be switched off manually.
The control of the fire pump has been arranged in such a way that motor failures, for example due to heating, do not cause the fire pump to stop, but only in fault indications and/or a potential-free signal to a superordinate fault centre.
Jockey pumps
Grundfos CR pumps are used as jockey pumps, maintaining the water level in the pressure tank. Under normal conditions, the jockey pump is activated by the low-level switch in the pressure tank as a result of small leakages in the pipe systems filled with water. The jockey pump operates until it is deactivated by the highlevel switch. The jockey pump can also be activated in case one or more sprinklers are open, in order to maintain the water level in the pressure tank.
The compressor can be set to manual or automatic operation by means of the selector switch.
During automatic operation, the compressor is controlled by an external pressure switch, for example connected to the pressure tank.
The compressor can be manually switched on and off.
A complete Fire NKF unit assembled and supplied from factory normally comprises these elements:
• a pump and motor mounted on a common base frame
• a standard coupling protected by a coupling guard.
Electrically driven sprinkler pump systems can be ordered with or without a controller according to
EN 12845.
The installer should commission the complete firefighting system before handing it over to the plant manager on site. Many potential issues of the complete system must be tested before commissioning to ensure a satisfactory system performance and identify any damage during installation.
Key components should be checked according to the descriptions in the respective installation and operating instructions. In addition, EN 12845 stipulates that tests such as these should be carried out:
• pressure test of sprinkler circuits
• values of all measuring devices (air pressure, water level, etc.) to the system
• water flow to fire pumps
• test of alarm system and interface to municipal fire department.
The installer should supply the plant manager with the following documents:
• Installation certificate, stating that the firefighting system has been installed according to EN 12845 requirements.
• A complete set of installation and operating instructions and system drawings with specification of all components for the plant manager and the owner of the system.

Curve charts
Fire NKF
Impeller size
QH curve for the individual pump
Total pump head:
H = H total
H
75
35
30
25
20
15
10
5
0
0
70
65
60
55
50
45
40
ø222
ø213
ø202
ø188
500
0
55 kW
45 kW
37 kW
30 kW
50
NKF 80-200
2-pole, 50 Hz
1000 1500 2000 2500 3000 3500 4000 4500 5000
100 150 200 250
ISO 9906 Annex A
ISO 9906 Annex A
300
Q [l/min]
Q [m³/h]
Pump type and frequency of motor
This line indicates the limit of the individual pump performance found at 5 m
NPSH.
The power curve indicates pump input power P2.
P2 is found at 16 m NPSH.
50
40
30
20
10
0
0
ø188 (NPSH)
ø188
ø222
ø213
ø202
ø222 (NPSH)
20
10
500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Q [l/min]
0
The NPSH curves are according to the minimum and maximum impeller diameter.
7

Performance curves
NKF 32-200
NKF 32-200
H
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0
ø219
ø200
ø185
ø171
100
0 10
11 kW
7.5 kW
5.5 kW
4 kW
200 300
20
400 500
30
600
40
700
NKF 32-200
2-pole, 50 Hz
ISO 9906 Annex A
ISO 9906 Annex A
800
50
Q [l/min]
Q [m³/h]
ø219
10
8
ø200
6
4
ø185
ø171
20
2 10
ø185 (NPSH) ø219 (NPSH)
0
0 100 200 300 400 500 600 700
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
800
Q [l/min]
0
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 32-200
Impeller sizes
>
∅
206
≤ ∅
219
>
∅
190
≤ ∅
206
>
∅
176
=
∅
176
≤ ∅
190
Electric motor
P2 [kW]
Diesel engine
11
7.5
5.5
4
19
8

9
Performance curves
NKF 40-250
NKF 40-250
50
40
30
20
10
110
100
90
80
ø260
ø250
ø238
ø230
70
ø210
60
30 kW
22 kW
18.5 kW
15 kW
11 kW
NKF 40-250
2-pole, 50 Hz
0
0
0
100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
Q [l/min]
10 20 30 40 50 60 70 80
Q [m³/h]
16
12
8
4
24
20
ø210
ø210 (NPSH)
ø230
ø238
ø250
ø260
ø260 (NPSH)
20
10
0
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
Q [l/min]
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
0
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 40-250
Impeller sizes
>
∅
255
≤ ∅
260
>
∅
245
≤ ∅
255
>
∅
230
≤ ∅
245
>
∅
211
≤ ∅
230
=
∅
211
P2 [kW]
Electric motor Diesel engine
30
26
22
18.5
15
11
19

Performance curves
NKF 50-200
NKF 50-200
20
15
10
5
0
0
0
30
25
65
ø219
60
ø207
55
50
ø194
45
40 ø170
35
200
20
400
22 kW
18.5 kW
15 kW
11 kW
600
40 60 80 100
NKF 50-200
2-pole, 50 Hz
ISO 9906 Annex A
800 1000 1200 1400 1600 1800 2000
120
Q [l/min]
Q [m³/h]
16
12
8
4
24
20
ø170 (NPSH)
ø170
ø219
ø194
ø207
ø219 (NPSH) 20
10
0
0 200 400 600 800 1000 1200 1400 1600
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
1800 2000
Q [l/min]
0
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 50-200
Impeller sizes
>
∅
207
≤ ∅
219
>
∅
194
≤ ∅
207
>
∅
170
≤ ∅
194
=
∅
170
Electric motor
P2 [kW]
Diesel engine
22 26
18.5
15
11
19
10

11
NKF 50-250
NKF 50-250
110
100
ø263
90
ø249
80
40
30
20
10
70
ø220
60 ø205
50
37 kW
30 kW
22 kW
18.5 kW
NKF 50-250
2-pole, 50 Hz
2950/3000 rpm
ISO 9906 Annex A
ISO 9906 Annex A
0
0
0
200 400
20
600
40
800 1000 1200 1400 1600 1800 2000 2200
60 80 100 120
Q [l/min]
Q [m³/h]
ø263
35
30
25
20
15
10
5
ø205
ø220
ø249
ø205 (NPSH) ø263 (NPSH)
20
10
0
0
0
200 400 600 800 1000 1200 1400 1600 1800 2000 2200
Q [l/min]
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 50-250
Impeller sizes
>
∅
249
≤ ∅
263
>
∅
220
≤ ∅
249
>
∅
205
≤ ∅
220
=
∅
205
Electric motor
P2 [kW]
Diesel engine
37
58
30
22
18.5
26
19

Performance curves
NKF 65-200
NKF 65-200
70
65
60
55
50
45
30
25
20
15
40
35
ø219
ø214
ø195
ø186
ø170
37 kW
30 kW
22 kW
18.5 kW
15 kW
NKF 65-200
2-pole, 50 Hz
2950/3000 rpm
ISO 9906 Annex A
ISO 9906 Annex A
10
5
0
0
0
200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800
20 40 60 80 100 120 140 160
Q [l/min]
180
Q [m³/h]
20
15
10
5
35
30
25
ø170
ø170 (NPSH)
ø219
ø214
ø186
ø195
ø219 (NPSH) 20
10
0
0
0
200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800
Q [l/min]
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 65-200
Impeller sizes
>
∅
215
≤ ∅
219
>
∅
195
≤ ∅
215
>
∅
186
≤ ∅
195
>
∅
170
≤ ∅
186
=
∅
170
P2 [kW]
Electric motor Diesel engine
37
58
30
22
18.5
26
19
15
12

13
Performance curves
NKF 80-200
NKF 80-200
H
75
70
65
ø222
ø213
50
45
40
35
60
55
30
25
20
15
10
5
0
0
ø202
ø188
500
55 kW
45 kW
37 kW
30 kW
1000 1500 2000 2500 3000
0 50 100 150
3500 4000 4500 5000
200 250
NKF 80-200
2-pole, 50 Hz
2950/3000 rpm
ISO 9906 Annex A
ISO 9906 Annex A
300
Q [l/min]
Q [m³/h]
50
40
30
ø222
ø213
ø202
ø188
20
ø222 (NPSH)
20
ø188 (NPSH)
10 10
0
0 500 1000 1500 2000 2500 3000 3500 4000
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
4500 5000
Q [l/min]
0
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 80-200
Impeller sizes
>
∅
213
≤ ∅
222
>
∅
202
≤ ∅
213
>
∅
188
≤ ∅
202
=
∅
188
Electric motor
P2 [kW]
Diesel engine
55
45
37
30
58

Performance curves
NKF 80-250
NKF 80-250
40
30
20
10
120
110
100
ø270
90
ø255
90 kW
75 kW
80
ø233
70
60
ø216
50
55 kW
45 kW
NKF 80-250
2-pole, 50 Hz
2950/3000 rpm
ISO 9906 Annex A
ISO 9906 Annex A
0
0
P2
90
0
80
70
500
50
1000 1500
100
2000 2500
150
3000 3500
200
4000 4500
250
5000 5500
300
Q [l/min]
Q [m³/h]
ø270
ø255
60
50
40
ø233
ø216
30
20
ø216 (NPSH)
10
0
0 500 1000 1500 2000 2500 3000 3500 4000 4500
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
ø270 (NPSH)
5000 5500
Q [l/min]
20
15
10
5
0
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 80-250
Impeller sizes
>
∅
255
≤ ∅
270
>
∅
233
≤ ∅
255
>
∅
216
≤ ∅
233
=
∅
216
Electric motor
P2 [kW]
Diesel engine
90
94
75
55
58
45
14

15
Performance curves
NKF 100-200
NKF 100-200
50
45
60
55
40
35
70
65
20
15
10
5
30
25
ø219
ø215
ø209
75 kW
55 kW
45 kW
2-pole, 50 Hz
2950/3000 rpm
ISO 9906 Annex A
ISO 9906 Annex A
0
0
P2
70
0
500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
Q [l/min]
50 100 150 200 250 300 350 400
Q [m³/h]
ø219
20
10
40
30
60
50
ø209 (NPSH)
ø215
ø209
ø219 (NPSH)
8
4
16
12
0
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
Q [l/min]
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
0
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 100-200
Impeller sizes
>
∅
215
≤ ∅
219
>
∅
209
≤ ∅
215
=
∅
209
Electric motor
P2 [kW]
Diesel engine
75 68
55
45
58

NKF 125-250.1
NKF 125-250.1
H
[m]
110
100
ø263
90
ø251.5
80
ø238.5
70
60
50
40
132 kW
110 kW
90 kW
ISO 9906 Annex A
30
20
10
0
0 50 100 150 200 250 300 350 400 450 500 550 Q [m³/h]
P2
[kW]
0
140
120
1000 2000 3000 4000 5000 6000 7000 8000 9000 Q [l/min]
ø263
100
80
60
ø251.5
ø238.5
NPSHR
[m]
20
15
ø238.5 (NPSHR)
40
ø263 (NPSHR)
10
5 20
0
0 50 100 150 200 250 300 350 400 450 500 550 Q [m³/h]
0
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate .
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 125-250.1
Impeller sizes
>
∅
251.5
≤ ∅
263
>
∅
238.5
≤ ∅
251.5
≤ ∅
238.5
Electric motor
P2 [kW]
Diesel engine
132 131
110
90
109
94
16

17
Performance curves
NKF 125-250
30
20
10
50
40
110
100
90
80
ø269
ø265
ø262
ø255
ø250
ø245
ø242
ø237
70
60
200 kW
160 kW
132 kW
110 kW
NKF 125-250
2-pole, 50 Hz
ISO 9906 Annex A
ISO 9906 Annex A
0
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Q [l/min]
P2
180
0 100 200 300 400 500 600
Q [m³/h]
ø269
160
140
120
ø255
ø245
60
40
20
0
ø237
100
80
0 1000 2000 3000 4000 5000 6000 7000 8000
ø269 (NPSH)
ø237 (NPSH)
9000 10000
Q [l/min]
16
12
8
4
0
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
The full lines show the performance curves of the standard pumps.
The dotted lines show the performance curves of intermediate (non-standard) pumps .
NKF 125-250
Impeller sizes
>
∅
255
≤ ∅
269
>
∅
245
≤ ∅
255
>
∅
237
≤ ∅
245
≤ ∅
237
Electric motor
P2 [kW]
Diesel engine
200 184
160
132
110
178
147
119
NKF 125-250

NKF 125-315
NKF 125-315
H
[m]
150
ø316
140
50
40
30
20
70
60
10
0
0
130 ø302
120
ø289
110
100
90
80
50
200 kW
160 kW
132 kW
ISO 9906 Annex A
100 150 200 250 300 350 400 450 500 550 Q [m³/h]
P2
[kW]
220
0
200
180
160
140
120
100
80
60
40
20
0
0
1000
50
2000
100 150
3000
200
4000
250
5000
300
6000
350
7000
400
8000 9000 Q [l/min]
ø316
ø302
450
ø289
ø316 (NPSHR)
ø289 (NPSHR)
NPSHR
[m]
20
15
10
5
0
500 550 Q [m³/h]
Circulation flow for diesel fire systems = maximum 2 % of rated flow rate.
The performance curves of electrically and diesel-powered pumps are approximately similar and based on the values in table below.
NKF 125-315
Impeller sizes
>
∅
302
≤ ∅
316
>
∅
289
≤ ∅
302
≤ ∅
289
P2 [kW]
Electric motor Diesel engine
200 197
160
132
164
131
18

97641687 1011
Repl. 97641687 1010
ECM: xxxxxxx
GB
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