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ApplicationsIn many cases, the typical properties of liquidring gas pumps render this pump type themost favourable or even the only suitablepump capable of meeting the specifiedrequirements. Some of its outstanding

features to be highlighted in this context are:

it is capable of handling almost all gasesand vapours used in the chemical andpharmaceutical industries. For eachrequirement, the service liquid is selected

to suit the product being pumped. compression accompanied by a very smalltemperature increase.

liquid ring vacuum pumps are alsocapable of compression to overpressures,and liquid ring compressors can also beoperated at suction pressures far belowatmospheric.

Without claiming to be complete, the following summary lists the numerouspossibilities for the application of liquid ringgas pumps:

Chemical process technologyLiquid ring gas pumps are used for distilling,drying, condensing, absorbing, evaporatingand filtering purposes.

Venting of steam turbine condensersLiquid ring vacuum pumps are used for thestart-up and condensing operations of steamturbine condensers.

Filter installationsLiquid ring vacuum pumps are suitable for usewith any type of vacuum filter.

Applications 65

Advantagesdue tospecificproperties

Fields ofapplication

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Steam and gas sterilisersBefore and after sterilisation, the steriliserchambers are evacuated with the help ofliquid ring vacuum pumps.

Plastics extrudersLiquid ring vacuum pumps are used to de-gasand dry the plastic compound.

Vacuum calibration of plastic profilesLiquid ring vacuum pumps are employed togenerate a vacuum which draws the plastic

profile against the walls of the mould.

Paper machinesDe-watering of the wet section of papermachines is performed with liquid ring vacuumpumps.

Sugar millsIn sugar mills, liquid ring compressors are used

for compressing carbon dioxide; liquid ringvacuum pumps are employed in the vacuum-pan house and for drying purposes.

Vacuum driersFor the purpose of vacuum drying, liquid ringvacuum pumps are used in connection withdifferent types of vacuum drier.

Solvent recoveryTo avoid health hazards and environmentalpollution, exhaust flows containing solventsare cleaned. The processes applied to recoverthe solvents could not be carried out withoutthe use of liquid ring vacuum pumps or liquidring compressors.

Lowering of the ground water tableLiquid ring vacuum pumps are used toevacuate a tank. Air and ground water areextracted from filter pipes over the tank.

66 Liquid ring vacuum pumps and liquid ring compressors

Fields ofapplication

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Drying and impregnation of woodWood can be dried quickly and withoutcracking if it is put under vacuum before being

dipped into an impregnation bath.

Sludge extraction vehiclesA liquid ring vacuum pump is used to producea vacuum in a collecting tank into which thesludge is then pumped automatically.

Water worksLiquid ring compressors are used in waterworks for the oxidation process, to aerate thewater, and to effect a reverse flow through the

filters.

Vacuum toiletsSewage is pumped pneumatically into acollecting tank under vacuum.

Mineral water production plantsThe gases contained in natural mineral waterare removed by means of evacuation.

Applications 67

Fig 41: Liquid ringcompressors

installed in adrinking watertreatment plant

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Automobile manufactureThe cooling, braking and air conditioningsystems are evacuated before being filledwith liquid.

Milk collecting tank trucksMilk is drawn out of the tanks in dairy farmsand into the tanker by means of a liquid ringvacuum pump.

Brick manufacture

To improve the quality of the clay used in brickmanufacture, it is de-gassed before pressing.

Automatic bottling plantBottles and cans are evacuated before filling.This process creates a low-oxygenatmosphere which prevents the beverage

from oxidizing.

Bleaching of chemical pulpLiquid ring compressors are used in oxygen -ozone - bleaching section for chemical pulp

68 Liquid ring vacuum pumps and liquid ring compressors

Fig 42: Liquid ring vacuum pump on achemical plant

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Vacuum mixing equipmentVacuum mixing equipment is used inproduction of liquid and paste - like products;by continuous deaeration and degassing, avery high degree of homogeneity of productsis achieved.

Mine gas extractionThe gas which forms during coal mining isdrawn off continuously to eliminate all risk ofexplosion.

Applications 69

Fields ofapplication