Edwards LR1A200 - Pumping System and Components; General; Base Framed Pump (with or Without Motor); Once through (with or Without Motor)

LRP200000201 Issue A
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Introduction
1.2 Pumping system and components
1.2.1 General
A pre-engineered range of manually operated and controlled liquid ring vacuum pumping systems suitable for use in
non-hazardous area applications across industrial markets, subject to the restrictions specified in the liquid ring
bareshaft instructions listed in Section 1.2.7.
The pumping systems are configured around a single or two-stage liquid ring vacuum pump, which is or is intended
to be direct driven through an electric motor that is suitable for either 50 or 60 Hz electrical supplies.
Four configurations are available, each mounted on a fabricated base frame:
 Base framed pump only: see Section 1.2.2.
 Once through: see Section 1.2.3.
 Partial recirculation: see Section 1.2.4.
 Total recovery: see Section 1.2.5.
1.2.2 Base framed pump (with or without motor)
Base framed pumps comprise a liquid ring pump mounted on a base frame, with or without an electric motor in order
for locally sourced electric motors to be installed.
Process gases and vapours enter through the inlet connection of the liquid ring pump, where they are compressed
and condensed using a sealing liquid that is continuously supplied to the liquid ring pump. The process gases and
remaining vapours, together with the used sealing liquid are exhausted through the outlet connection of the liquid
ring pump and into an exhaust extraction system.
1.2.3 Once through (with or without motor)
A once through modules adds an exhaust separator tank to the base framed pump.
The process gases and remaining vapours, together with the used sealing liquid are exhausted through the outlet
connection of the liquid ring pump and into a separator tank. A combination of gravitational and centrifugal forces
separate the process gasses and remaining vapours from the used sealing liquid. The process gases and remaining
vapours are exhausted through the outlet connection of the separator tank and into an exhaust extraction system,
while the used sealing liquid goes to a safe drain.
1.2.4 Partial recirculation (with or without motor)
A partial recirculation module adds a sealing liquid recirculation line into the once through module.
The process gases and remaining vapours, together with the used sealing liquid are exhausted through the outlet
connection of the liquid ring pump and into a separator tank. A combination of gravitational and centrifugal forces
separate the process gasses and remaining vapours from the used sealing liquid. The process gases and remaining
vapours are exhausted through the outlet connection of the separator tank and into an exhaust extraction system,
while the recovered sealing liquid is mixed with fresh sealing liquid to maintain a constant temperature to the liquid
ring pump. The excess sealing liquid goes to a safe drain.
1.2.5 Total recovery (with or without motor)
A total recovery module adds a heat exchanger into the sealing liquid recirculation line within a partial recirculation
module.
The process gases and remaining vapours, together with the used sealing liquid are exhausted through the outlet
connection of the liquid ring pump and into a separator tank. A combination of gravitational and centrifugal forces