NDMs Series Between-Bearings Multistage Segmental Pumps

Applications: Designed for handling liquefied hydrocarbon gases, volatile flammable and inflammable liquids as well as solutions of inorganic alkalis (sodium hydroxide) at the process plants in the oil-refining industry.

May be also used to transfer water and condensate in the steam and water circuit systems.

Design: NDMs series motor pump units consist of a centrifugal pump and an induction motor in the explosion-proof version, which are mounted on a common fabricated base plate.

The pump and motor shafts are connected by means of a flexible coupling. The pump units shall be rigidly anchored to the foundation, and piping shall be also rigidly connected to the pumps.

The pumps as components of the pump units are electrically driven horizontal, centreline-supported, multistage ring section centrifugal pumps with rotor axial thrust balancing by a balance drum.

The suction and delivery casings of the pump have flanged suction and discharge nozzles respectively which are oriented radially to the top. Counter flanges have a weld neck.

In order to enable the pump to withstand hot and cold shocks and thus to allow for free expansion of static components during the pump operation whilst maintaining coupling alignment, the delivery casing (on the drive side) are rigidly dowelled to the base plate pedestal and the other end is pinned so that it should be axially moveable.

The pump rotor is carried by the grease lubricated or oil-bath (with oil ring) lubricated antifriction bearings.

Pump shaft sealing is by mechanical seals in tandem arrangement, which utilizes a pressurized barrier fluid, neutral to handled medium.

Sense of rotation of pump shaft is:

  • either counterclockwise (in case of the pump models NDMs 15, NDMs 25, NDMs 40, NDMs 45, NDMs 50, NDMs 55, NDMs 60, NDMs 65 and NDMs 8), if viewed from the drive side;
  • or clockwise (in case of the pump models NDMs 75 и NDMs 105), if viewed from the drive side;
NP
NPh
SG
DN
mm
50-200
50-200
50 - 146
Q
m3/h
126
126
96
H
m
675
675
392
p
kg/cm2
23
23
23
t
oС
+10  -  +50, +120
+280
+10  -  +60
n (sync)
rpm
3000
3000
3000

Coverage chart of the NDMs 15 and NDMs 25 Model Pumps

Coverage chart of the NDMs Series Pumps

Coverage chart of the NDMs 75 and NDMs 105 Model Pumps

Handled Media:

  • NDMs XX-XX-SG U2 - Liquefied hydrocarbon gases 10oС to 60oС
  • NDMs XX-XX-NPh U2 - Refined products  up to 280oС
  • NDMs XX-XX-NP U2 - Refined products  up to 120oС

Solutions of inorganic alkalis: sodium hydroxide (NaOH) 10oС to 50oС

Performance of the NDMs Series Pumps:

Pump make Pump parameters
Capacity, m3/h Head, m Speed of rotation, rpm Power input (r=1000 kg/m3), kW Efficiency, % NPSH required, m
NDMs 15-345-NP U2
NDMs 15-345-NPH U2
NDMs 15-345-SG U2
15
345
2940
30
47
3.2
NDMs 15-310-NP U2
NDMs 15-310-NPH U2
NDMs 15-310-SG U2
310
26.9
NDMs 15-275-NP U2
NDMs 15-275-NPH U2
NDMs 15-275-SG U2
275
23.9
NDMs 15-240-NP U2
NDMs 15-240-NPH U2
NDMs 15-240-SG U2
240
20.9
NDMs 15-205-NP U2
NDMs 15-205-NPH U2
NDMs 15-205-SG U2
205
17.8
NDMs 15-170-NP U2
NDMs 15-170-NPH U2
NDMs 15-170-SG U2
170
14.8
NDMs 15-135-NP U2
NDMs 15-135-NPH U2
NDMs 15-135-SG U2
135
11.7
NDMs 15-105-NP U2
NDMs 15-105-NPH U2
NDMs 15-105-SG U2
105
9.1
NDMs 15-70-NP U2
NDMs 15-70-NPH U2
NDMs 15-70-SG U2
70
6.1
NDMs 15-35- НП U2
NDMs 15-35- НПг U2
NDMs 15-35-SG U2
35
3.0
NDMs 25-165-NP U2
NDMs 25-165-NPH U2
NDMs 25-165-SG U2
25
165
2940
18.7
60
2.2
NDMs 25-130-NP U2
NDMs 25-130-NPh U2
NDMs 25-130- СГ U2
25
130
2940
14.8
60
2.2
NDMs 25-120-NP U2
NDMs 25-120-NPh U2
NDMs 25-120-SG U2
120
13.6
NDMs 25-100-NP U2
NDMs 25-100-NPh U2
NDMs 25-100-SG U2
100
11.3
NDMs 25-80-NP U2
NDMs 25-80-NPh U2
NDMs 25-80-SG U2
80
9.1
NDMs 25-40-NP U2
NDMs 25-40-NPh U2
NDMs 25-40-SG U2
40
4.5
NDMs 40-230-NP U2
NDMs 40-230-NPh U2
NDMs 40-230-SG U2
40
230
2940
41.1
61
2.3
NDMs 45-160-NP U2
NDMs 45-160-NPh U2
NDMs 45-160-SG U2
45
160
31.1
63
NDMs 45-115-NP U2
NDMs 45-115-NPh U2
NDMs 45-115-SG U2
115
22.4
63
NDMs 50-150-NP U2
NDMs 50-150-NPh U2
NDMs 50-150-SG U2
50
150
31.9
64
NDMs 50-80-NP U2
NDMs 50-80-NPh U2
NDMs 50-80-SG U2
80
17.0
64
NDMs 55-125-NP U2
NDMs 55-125-NPh U2
NDMs 55-125-SG U2
55
125
31.7
59
NDMs 55-100-NP U2
NDMs 55-100-NPh U2
NDMs 55-100-SG U2
100
25.4
64
NDMs 60-100-NP U2
NDMs 60-100-NPh U2
NDMs 60-100-SG U2
60
100
24.0
68
NDMs 65-60-NP U2
NDMs 65-60-NPh U2
NDMs 65-60-SG U2
65
60
16.6
64
NDMs 75-660-NP U2
NDMs 75-660-NPh U2
75
660
2979
218
62
5.0
NDMs 75-560-NP U2
NDMs 75-560-NPh U2
560
185
62
NDMs 80-140-NP U2
NDMs 80-140-NPh U2
NDMs 80-140-SG U2
80
140
2940
43.6
70
2.4
NDMs 80-85-NP U2
NDMs 80-85-NPh U2
NDMs 80-85-SG U2
85
26.5
70
NDMs 105-600-NP U2
NDMs 105-600-NPh U2
105
600
2979
260
66
6.0
NDMs 105-360-NP U2
NDMs 105-360-NPh U2
360
156
66

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