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How to install and correctly protect
your electric pump
Install your electric pump as close as possible to the water
reservoir. Long distances between the intake and the electric
pump will allow the formation of air bubbles and impair pumping.
Prefer long-ray curves instead of pipe bends
and avoid excessive use of connections in the pipes, mainly
at suction. Install joints to facilitate equipment maintenance.
Whenever the upsetting pipe is longer than
20 meters in vertical position, install a retention valve
right after the pump outlet and another (others) at every
20 meters to protect the whole hydraulic system against "Hydraulic
Ram". Do the same with horizontal pipes, at every 200
meters of length.
Avoid as much as possible to use pipes of
a diameter lower than the original gauge presented in the
pumps, mainly at suction as it will increase friction and
loss of flow.
Fill up with water the whole suction pipe
and the pump body before starting it. For self-primer electric
pumps (Sasp H/X) and (SAE), where the use of a foot valve
is not compulsory (well bottom), fill up with water the pump
body only.
Protect electric motors against overload in
general (voltage drop or peak, lack of phase, shaft locking
etc.) by installing a magnetic switch with protection for
electric pumps. This product can be purchased at Somar electric
pumps dealers (see below). Circuit breakers or simple fuses
do not properly protect electric motors.
Splices to electric motor cables have to be
made with cables of the same gauge or bigger than that of
the motor, up to a distance of 20 meters between the motor
and the panel.
For a greater distance, consult the wire and cable table in
the electric pumps manual.
For electric pumps with three-phase motors
and for those with bearings, observe the correct motor turning
direction - to the right, clockwise, seen from the back of
the motor - before definitely operating it. In case it turns
counterclockwise, there will be pressure and flow drop and
rotor displacement in the shaft, damaging the electric pump.
Before connecting the motor to the electric
supply, make sure the voltage (volts) and power supply (single-phase
or three-phase) are compatible. Join the motor cables according
to the connection diagram of your identification tag.
Products General Data
A - All supply and suction connections of
the electric pumps of this catalogue use BSP thread.
B - All horizontal centrifugal electric pumps are provided
with shaft/rotor mechanical sealing, to be used with water
temperatures of at most 60ºC, except for model Sasp H/X
(self-primers). For applications in steam boilers and other
uses with water up to 98ºC, use a Viton mechanical sealing.
Electric pumps used in steam boilers of water temperature
between 70 and 98ºC, shall be operated "by gravity"
in suction, minimum positive manometric height of 2 mca.
C - Grounding of electric pumps electric motors is compulsory.
The company is not responsible for accidents or injuries originated
from the not compliance with this regulation.
D - The use of electric pumps with chemical substances not
compatible with the materials used in their construction,
such as food products, flammable and medicinal liquids is
strictly forbidden. Somar is not responsible for accidents
or injuries originated from the improper use of its products.
E - The hydraulic data here presented were obtained at sea
level, with clean water at a temperature of 25ºC; these
data may vary in ± 5% in the daily use of the products.
F - Somar reserves the right to change the technical data
of its products in whole or in part without previous notice
to the market.
Selection of a electric pump for household
use
| TIPS: |
| - Suction Height: 2,0 meters |
| - Supply Height: 7,0 meters |
| - Total Length of Pipes: 20,0 meters |
| - Water Flow Desired: 1,0 m3/hour |
| RESOLUTION: |
| Definition of Pipe Gauges (table 3) from
0 to 1m3/h; 25mm (3/4") pipe |
| Calculation of Load loss (table 4) for
1m3/h x diameter of 25mm load loss = 6,0 % |
| 6,0% of 20,0 meters of pipes = 1,2 meters |
Calculation of the Total Manometric Height
(AMT):
- AMT = AS + AR + PC (load loss in meters)
- AMT = 2,0 + 7,0 + 1,2 : AMT = 10,2 MCA
SELECTION OF THE ELECTRIC PUMP:
For a flow of 1m3/h and pressure of 10,2 mca, we can see that
the most suitable model is SH Hobby - 1/4 cv - 12mca - 1,6
m3/h, as in the table below:
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gauge (in)
|
motor
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|
maximum
pressure
(mca)
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Selection Table
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Manometric Height
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3
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6
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9
|
12
|
15
|
18
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| SH |
1/4
|
3/4
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3/4
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x
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|
92
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15
|
5,8
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4,7
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3,4
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1,6
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| SH |
1/3
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3/4
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3/4
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x
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95
|
17
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6,2
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5,0
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4,0
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2,7
|
0,7
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| SH |
1/2
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3/4
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3/4
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x
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105
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21
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6,6
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5,8
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4,5
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4,0
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2,7
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12
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Flow x Pipe Diameter Table
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Flow Required
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Pipe Dioameter (commercial gauge)
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Liters per hour (l/h)
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Cubic meters per hour (m³/h)
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Inches (pipes that can be threaded)
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Milimeters (pipes that can be welded)
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0 a 1.000
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0 a 1
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3/4
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25
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1.000 a 2.000
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1 a 2
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1
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32
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2.000 a 4.000
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2 a 4
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1.1/4
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40
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4.000 a 8.000
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4 a 8
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1.1/2
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50
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8.000 a 15.000
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8 a 15
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2
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60
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15.000 a 30.000
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15 a 30
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2.1/2
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75
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30.000 a 60.000
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30 a 60
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3
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85
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60.000 a 120.000
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60 a 120
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4
|
110
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Note: For a suction height higher than 2 meters
and/or pump distance to water intake longer than 5 meters,
it is recommended to use in the suction line a pipe with a
diameter bigger (one gauge bigger) than that used in the supply
to decrease load losses.
Load Loss (%) in PVC Pipes Table
| Flow |
Pipe
Commercial Diameter (millimeters) |
| m3/hour |
25 |
32 |
40 |
50 |
60 |
75 |
85 |
110 |
140 |
160 |
| 0,5 |
2,0 |
1,0 |
0,2 |
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| 1,0 |
6,0 |
2,0 |
0,6 |
0,2 |
0,1 |
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| 1,5 |
12,0 |
4,0 |
1,3 |
0,5 |
0,2 |
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| 2,0 |
20,0 |
7,0 |
2,0 |
0,7 |
0,3 |
0,06 |
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| 2,5 |
28,0 |
10,0 |
3,0 |
1,0 |
0,4 |
0,10 |
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| 3,0 |
40,0 |
14,0 |
4,0 |
1,5 |
0,5 |
0,13 |
0,04 |
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| 3,5 |
52,0 |
18,0 |
6,0 |
2,0 |
0,7 |
0,17 |
0,07 |
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| 4,0 |
66,0 |
23,0 |
7,0 |
2,5 |
0,9 |
0,21 |
0,09 |
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| 4,5 |
80,0 |
28,0 |
9,0 |
3,0 |
1,0 |
0,26 |
0,11 |
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| 5,0 |
97,0 |
34,0 |
11,0 |
4,0 |
1,3 |
0,31 |
0,13 |
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| 5,5 |
|
40,0 |
12,0 |
4,0 |
1,5 |
0,37 |
0,15 |
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| 6,0 |
|
46,0 |
14,0 |
5,0 |
1,7 |
0,43 |
0,18 |
0,05 |
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| 6,5 |
|
53,0 |
17,0 |
6,0 |
2,0 |
0,49 |
0,21 |
0,06 |
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| 7,0 |
|
60,0 |
19,0 |
6,5 |
2,3 |
0,56 |
0,24 |
0,07 |
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| 7,5 |
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68,0 |
22,0 |
7,0 |
2,6 |
0,63 |
0,27 |
0,08 |
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| 8,0 |
|
76,0 |
24,0 |
8,0 |
2,9 |
0,70 |
0,31 |
0,09 |
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| 8,5 |
|
85,0 |
26,0 |
9,0 |
3,2 |
0,78 |
0,34 |
0,10 |
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| 9,0 |
|
94,0 |
29,0 |
10,0 |
3,5 |
0,87 |
0,38 |
0,11 |
0,02 |
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| 9,5 |
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32,0 |
11,0 |
3,9 |
0,96 |
0,41 |
0,12 |
0,03 |
0,02 |
| 10,0 |
|
|
35,0 |
12,0 |
4,2 |
1,05 |
0,45 |
0,13 |
0,04 |
0,03 |
| 12,0 |
|
|
48,0 |
17,0 |
5,8 |
1,45 |
0,62 |
0,17 |
0,06 |
0,04 |
| 14,0 |
|
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63,0 |
22,0 |
7,6 |
2,00 |
0,80 |
0,23 |
0,08 |
0,06 |
| 16,0 |
|
|
80,0 |
28,0 |
9,5 |
2,40 |
1,00 |
0,28 |
0,10 |
0,07 |
| 18,0 |
|
|
98,0 |
34,0 |
12,0 |
3,00 |
1,30 |
0,35 |
0,12 |
0,08 |
| 20,0 |
|
|
|
41,0 |
14,2 |
3,60 |
1,50 |
0,42 |
0,15 |
0,10 |
| 25,0 |
|
|
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60,0 |
21,0 |
5,00 |
2,00 |
0,62 |
0,23 |
0,17 |
| 30,0 |
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83,0 |
29,0 |
7,00 |
3,00 |
0,85 |
0,30 |
0,20 |
| 35,0 |
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100,0 |
38,0 |
10,00 |
4,00 |
1,20 |
0,40 |
0,28 |
| 40,0 |
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48,0 |
12,00 |
5,00 |
1,45 |
0,50 |
0,34 |
| 45,0 |
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15,00 |
7,00 |
1,80 |
0,60 |
0,40 |
| 50,0 |
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18,00 |
8,00 |
2,00 |
0,70 |
0,46 |
| 55,0 |
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21,00 |
9,00 |
3,00 |
0,90 |
0,55 |
| 60,0 |
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24,00 |
11,00 |
3,50 |
1,00 |
0,65 |
| 70,0 |
|
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|
32,00 |
14,00 |
4,00 |
1,40 |
1,00 |
| 80,0 |
|
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|
40,00 |
18,00 |
5,00 |
1,70 |
1,50 |
Note: Avoid using values bigger than 10% not
to increase load loses, mainly at the suction pipe.
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