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 è 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 |
oÑ |
+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 10oÑ to 60oÑ
- NDMs XX-XX-NPh U2 - Refined products up to 280oÑ
- NDMs XX-XX-NP U2 - Refined products up to 120oÑ
Solutions of inorganic alkalis: sodium hydroxide (NaOH) 10oÑ to 50oÑ
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- ÍÏ U2 NDMs 15-35- ÍÏã 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- ÑÃ 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 |
|||
