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| ■ SIHI liquid ring vacuum pumps are displacement pumps of uncomplicted and robust construction with the following particular features |
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non-polluting due to nearly isothermal compression
oil-free, as no lubrication in the working chamber
handling of nearly all gases and vapours
small quantities of entrained liquid can be handled
easy maintenance and reliable operation
low noise and nearlt free from vibration
wide choice of material, therefore applicable nearly everywhere
shaft not in contact with the medium
protection against cavitation as standard
incorporated dirt drain
incorporated central drain
no merallic contact of the rotating parts |
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| ※ The SIHI liquid ring vacuum pumps LEM/LEL are single-stage ones. |
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| ■ Application |
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Handling and exhausting of dry and humid gass; entrained liquid can be handled during normal duty. The pumps are applied in all fields where a pressure of 33 to 900 mbar must be created by robust vacuum pumps. |
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| ■ Note |
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During operation the pump must continuoisly be supplied with service liquid, normally water, in order to eliminate the heat resulting from the gas compression and to replenish the liquid ring, because part of the liquid is leaving the pump together with the pas. This liquid can be separated from the gas in a liquid separator (see catalogue part A). It is possible to reuse the service liquid. The pumps are equipped with a device by which the contaminated service liquid can continuously be drained during operation (dirt drain), If necessary.
The direction of rotation is clockwise, when looking from the drive on the pump. |
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| ■
Technical data |
| LEM
Series |
unit |
LEM25 |
LEM50 |
LEM90 |
LEM125 |
LEM150 |
LEM250 |
LEM325 |
LEM425 |
|
Speed
50Hz
60Hz |
rpm |
2800
3500 |
1450
1750 |
1450
1450 |
|
Max.
compression overpressure |
bar |
0.3 |
0.3/0.5 |
0.3(0.5") |
|
Max.
admissible pressure difference |
bar |
1.1 |
1.1/1.5 |
1.1(1.5") |
|
Moment
of inertial of the
rotating
pump parts and of the
water
filling |
kg/§³ |
0.003 |
0.0095 |
0.035 |
0.053 |
0.069 |
0.097 |
0.14 |
0.21 |
|
Sound
pressure level at a
suction
pressure of 80 mbar |
dB(a) |
68 |
69 |
65 |
70 |
72 |
|
Max.
gas temperature dry |
¡É |
200 |
200 |
200 |
|
satutated |
¡É |
100 |
100 |
100 |
|
Service
liquid
max.admissible
temperature |
¡É |
|
|
|
|
materials
: 0A, 0B, 0R, 4B |
|
80 |
80 |
80 |
|
0F,
7C, 7R |
|
40 |
- |
- |
|
max.
viscosity |
§±/s |
4 |
4 |
4 |
|
max.
density |
kg/§© |
1.2 |
1.2 |
1.2 |
|
volume
of liquid up to shaft
level |
Liter |
0.3 |
0.4 |
2.4 |
2.8 |
3.2 |
4.0 |
4.3 |
4.7 |
|
max.
flow resistance
of
the heat exchanger |
bar |
0.2 |
0.2 |
0.2 |
|
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| LPH
Series |
unit |
LPH-45008 |
LPH-45311 |
LPH-45316 |
|
speed |
rpm |
1150 |
1450 |
1740 |
1150 |
1450 |
1740 |
1150 |
1450 |
1740 |
|
power of the electric motor
provided for drive |
kW |
2.2 |
3/4 |
4 |
3 |
4 |
5.5 |
4 |
5.5 |
7.5 |
|
inertia moment of the rotating
pump parts and water filling |
kg x §³ |
0.05 |
0.063 |
0.09 |
|
contents of liquid in the
pump upto shaft level |
liter |
4 |
5.5 |
7 |
|
heat
to be eliminated when compres
_sing
air from 120 to 1013 mbar |
kW |
1.3 |
2.1 |
3.1 |
1.6 |
2.5 |
3.5 |
2.1 |
3.2 |
4.6 |
|
lowest
suction pressure permissible
for
continuous operation at a
service
water temperature of 15¡É |
mbar |
33 |
33 |
33 |
|
max. pressure difference
permissible between suction
and compression pressure |
bar |
1.5 |
1.5 |
1.5 |
1.2 |
1.2 |
1.2 |
1.0 |
|
min. pulley diameter permissible
in case of V-belt drive |
mm |
160 |
160 |
160 |
|
sound pressure level of measuring
area at a suction pressure
of 80mbar |
dB(A) |
64 |
65 |
66 |
64 |
65 |
66 |
64 |
65 |
66 |
|
max.
temperature permissible
service
liquid 100¡É
gas
120¡É |
max.
viscosity permissible of service
liquid 90 §±/s
max.
flow resistance of heat exchanger
0.2bar |
|
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| LPH
Series |
unit |
LPH-55312 |
LPH-55316 |
LPH-55320 |
| speed
|
rpm |
1150 |
1450 |
1740 |
1150 |
1450 |
1740 |
1150 |
1450 |
1740 |
| power
of the electric motor provided for
drive |
kW |
7.5 |
7.5/11 |
15 |
7.5 |
11 |
15 |
11 |
11/15 |
15 |
| inertia
moment of the rotating pump parts
and water filling |
kg x §³ |
0.137 |
0.162 |
0.205 |
| contents
of liquid in the pump upto shaft level
|
liter |
9 |
10 |
12 |
|
heat
to be eliminated when
compressing
air from 120 to
_1013
mbar |
kW |
4.3 |
5.9 |
9 |
4.8 |
6.7 |
10 |
7.9 |
8.1 |
11.3 |
|
lowest
suction pressure permis
_sible
for continuous operation
at
a service water temperature
of
15¡É |
mbar |
33 |
33 |
33 |
|
max.
pressure difference permissible
between suction and compression
pressure |
bar |
1.5
(1.2) |
1.5
(1.1) |
1.5
(1.0) |
1.5
(1.2) |
1.5
(1.1) |
1.3
(1.0) |
1.2
(1.2) |
1.1
(1.0) |
10 |
|
min.
pulley diameter permis
_sible
in case of V-belt drive |
mm |
200 |
200 |
not admissible |
|
sound
pressure level of measuring area
at a suction pressure of 80mbar |
dB(A) |
66 |
66 |
66 |
|
max.
temperature permissible
service
liquid 100¡É
gas
120¡É |
max.
viscosity permissible of service
liquid 90 §±/s
max.
flow resistance of heat exchanger
0.2bar |
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