Liquid ring vacuum pumps LEH 1200, LEH 1500, LEH 18000 pages

Liquid ring vacuum pumps
LEH 1200, LEH 1500, LEH 1800
VACUUM TECHNOLOGY LEH LE 5A
133.71330.52.01 E 03/2008
Pressure range: 33 to 1013 mbar
Suction volume flow: 440 to 2050 m³/h
CONSTRUCTION TYPE
SIHI liquid ring vacuum pumps are displacement pumps of
uncomplicated and robust construction with the following particular
features:
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 nearly free from vibration
wide choice of material, therefore applicable nearly
everywhere
Internal service liquid return; adjustable from the outside
protection against cavitation as standard
incorporated dirt drain
incorporated central drain
no metallic contact of the rotating parts
The SIHI liquid ring vacuum pumps LEH are single-stage ones.
APPLICATION
Handling and exhausting of dry and humid gases; 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.
Fields of application are for example:
chemistry and pharmacy for distilling and degassing,
electric industry for impregnation and drying
plastics industry for degassing etc.
NOTE
During operation the pump must continuously 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 gas.
This liquid can be separated from the gas in a liquid separator (see
catalogue part accessories).
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.
GENERAL TECHNICAL DATA
Pump type unit LEH 1200 LEH 1500 LEH 1800
Speed
50 Hz
60 Hz rpm 975
1175
Max. compression over pressure bar 1,5 1,2
Max. admissible pressure difference bar 1,5 1,2
Hydraulic test (over pressure) bar 3
Moment of inertial of the rotating
pump parts and of the water filling kg . m² 2,6 3,05 3,5
Sound pressure level
at a suction pressure of 80 mbar
dB (A)
79
Min. pulley diameter permissible
in case of V-belt drive
mm
355
500
Max. gas temperature dry
saturated
°C
°C
200
100
Service liquid
max. admissible temperature
max. viscosity
max. density
°C
mm²/s
kg/m³
80
90
1200
volume up to shaft level liter 30 35 39,5
Max. flow resistance
of the heat exchanger bar 0,2
The combination of several limiting values is not admissible.