Instruction and service manual
Screw vacuum pumps
S-VSB
S-VSB 120
S-VSB 200
S-VSB 320
S-VSB 430
S-VSB 800
S-VSB 2700
BE 831
2.1.2002
Gardner Denver
Schopfheim GmbH
Postfach 1260
79642 SCHOPFHEIM
GERMANY
Fon +49 7622 / 392-0
Fax +49 7622 / 392-300
e-mail: er.de@
gardnerdenver.com
www.gd-elmorietschle.com
Screw vacuum pumps
Table of contents: Page:
1. Introduction 3
2. Application 3
3. General Construction 4
3.1 General 4
3.2 Construction 4
3.3 Technical specifications 4
3.4 Cooling system 5
3.4.1 Fresh water cooling 5
3.4.2 Circulation Cooling 5
3.4.3 Cooling gas 5
3.5 Gases 5
3.5.1 Sealing gas 5
3.5.2 Cleaning gas 5
3.6 Bleeding valve 5
4. Handling procedure 6
4.1 Assembly of piping 6
4.1.1 Location 6
4.1.2 Foundation 6
4.1.3 Installation 6
4.2 Piping work 6
4.2.1 Main piping 6
4.2.2 Cooling water piping 6
4.3 Coupling drive 6
4.4 Preparation for operation 6
4.5 Operation 6
4.6 Stopping 6
4.7 Lubrication 6
5. Maintenance and inspection 7
5.1 General 7
5.2 Periodical inspection 7
5.3 Disassembly 8
5.3.1 Cautions in disassembly 8
5.3.2 Disassembling procedure 8
5.4 Re-assembly 8
5.4.1 Cautions in re-assembly 8
5.4.2 Re-assembling procedure 9
6. Trouble shooting 10
Data sheets:
D831/1 ➝ VSB (30), (20)
Spare parts list:
E831/1 ➝ VSB (01)
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1. Introduction
To prevent contamination from possible dangerous substances contained in the process, the exhaust outlet must always be
connected to an appropriate emission control system.
All units being returned to our works for maintenance or any other reason must be free of harmful and dangerous
material. A Health and Safety certificate should always be provided.
The customer has the responsibility for providing and checking explosion proof safety requirements for the total site in which
vacuum pumps are used.
An appropriate agreement should be obtained from the local licensing authorities.
2. Application
The TWISTER vacuum pumps are particularly suitable for the handling of extremely humid gases. These pumps have a high water
vapour tolerance.
The ambient temperatures may be between 5 and 40°C. The suction temperatures should not exceed 60°C. For
temperatures out of this range please contact your supplier.
Liquid slugs and solids cannot be handled by TWISTER.
Handling of explosive gases or vapours only on request with our company.
For installations that are higher than 1000 m sea level there will be a loss in capacity. For further advice please
contact your supplier.
The standard versions may not be used in hazardous areas. Special versions with Ex-proof motors can be supplied.
All applications where an unplanned shut down of the pump could possibly cause harm to persons or installations, then the corresponding safety backup systems must be installed.
Cut view TWISTER VSB
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3. General Construction
3.1 General
The Rietschle TWISTER pumps gases
and vapours by use of two screw rotors, having a profile comprising a plurality of curves, i.e. Archimedean curve,
Quimby curve and arc, which rotate
smoothly with a certain clearance maintained between each other and inside
wall of the casing.
The gases and vapours being pumped
are smoothly pressurised up to the
pressure on the discharge side. The
pump is so constructed as to prevent
oil from entering the pumping chamber.
The power of the motor is transmitted
to the gear by a coupling.
3.2 Construction
• Rotor shaft: The rotor shaft is
made of high grade spheroidal
graphite cast steel, and precision machined through numerical control by a special machine. It is perfectly dynamically
balanced after the rotor is machined.
• Timing Gear: The timing gears are the most important part of the screw vacuum pump, and they are required to maintain
the precision clearance between the rotors. The tooth surface is heat cured, and then polished with a special high precision
tooth polishing machine for noise reduction.
• Bearing: The bearings on the fixed end are angular contact ball bearings and on the floating end are roller bearings of
heavy load capacity. These bearings have been selected for high speed and heavy load service and to assure the accurate
maintenance of clearances between gears and between rotors.
• Shaft sealing suction side: The shaft sealing consists of two double lipped shaft seals.
Shaft sealing pressure side: A mechanical spring plate assures sealing between the chamber and the gear box. An
additional single lipped shaft seal in combination with sealing gas prevents foreign particles from entering the sealing system.
Shaft sealing gear box: A single lipped shaft seal seperates the gear box from the atmospheric pressure.
• Oil Level Gauge: The Oil Level Gauge is located in the Front End Cover. Oil should be supplied to the top level of Red mark.
If the oil level is too low, Gear, Bearing and Mechanical Seal will be damaged as a result of improper lubrication. The timing
gears, bearings and mechanical seals are splash lubricated. Check oil level and look for contamination when the pump is
stopped.
3.3 Technical specifications
VSB 120 (30) 200 (30) 320 (30) 430 (30) 800 (30) 2700 (20)
Nominal (theoretical) Displacement
Ultimate vacuum
Discharge pressure
Motor rating
Speed
Port size (Suction / Discharge)
Gear oil
Max. internal pressure
Cooling water
Cooling water pressure
Cooling gas
Sealing gas
m³/h
50 Hz 80 120 220 330 560 1700
60 Hz 100 150 260 400 700 2100
mbar (abs.) 0,3 0,3 0,3 0,3 0,05 0,05
bar (abs.) max. 1,3
50 Hz 3,0 4,0 5,5 7,5 15 55
kW
60 Hz 3,6 4,8 6,5 9,0 18 65
50 Hz 2850 1450
-1
min
60 Hz 3450 1740
DN 40 50 / 40 50 / 40 80 / 50 100 / 80 150 / 100
l 0,45 1,0 1,6 1,8 2,0 9,0
bar (abs.) 10
l/h 120 240 480 660 1200 2160
bar (abs.) max. 6
3
Nm
/h - - - 25 30 30
cm³/min max. 3
Front end plate Bellows type mechanical seal
Seal type Rear end plate Lip seals
Front end cover (drive shaft Oil seal
Weight
kg 120 240 480 660 1200 2160
Note:
(1) The quantity of oil listed is only for reference, and surplus should be available. It should be noted that fluorine and mineral
based oils can be used. For shipping, we supply pure gear oil.
(2) The Cooling Water flow quoted is based on water temperature of 20° C. The amount of water will vary when using an After
Cooler. Please check with Vendor’s approved drawing.
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