BUSCH DOLPHIN LG 0890 A User manual

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Instruction Manual
DOLPHIN
Liquid Ring Vacuum Pumps
LG 0890 A, LG 1200 A, LG 1910 A, LG 2680 A
LR 0700 A, LR 1190 A, LR 1560 A, LR 2200 A
0870231039/-_en / Original instructions / Modifications reserved 08/06/2020
Busch GVT Ltd.
Unit A, Westmere Drive
Crewe, Cheshire CW1 6ZD
United Kingdom

Table of Contents
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Table of Contents
1 Safety .......................................................................................................................................3
2 Product Description ..................................................................................................................4
2.1 Description of Figures 1 - 4 .............................................................................................. 5
2.2 Operating Principle .......................................................................................................... 7
2.3 Application....................................................................................................................... 7
2.4 Start Controls ................................................................................................................... 7
2.5 Variants............................................................................................................................ 7
2.5.1 LG Series ...............................................................................................................7
2.5.2 LR Series................................................................................................................ 7
3 Transport ..................................................................................................................................8
4 Storage .....................................................................................................................................9
4.1 Short Term (Up to 3 Months)........................................................................................... 9
4.2 Medium Term (3 Months to 6 Months)............................................................................ 9
4.3 Long Term (Over 6 Months) ............................................................................................ 9
5 Installation................................................................................................................................10
5.1 Installation Conditions...................................................................................................... 10
5.2 Connecting Lines / Pipes .................................................................................................. 10
5.2.1 Suction Connection ...............................................................................................11
5.2.2 Discharge Connection ........................................................................................... 11
5.2.3 Operating Liquid Connection ................................................................................ 12
5.3 Operating Liquid Settings................................................................................................. 12
5.4 Fitting the Coupling ......................................................................................................... 15
5.5 Electrical Connection ........................................................................................................ 16
5.5.1 Wiring Diagram Three-Phase Motor...................................................................... 16
6 Commissioning.........................................................................................................................17
6.1 Preventing Cavitation....................................................................................................... 18
7 Maintenance.............................................................................................................................19
7.1 Maintenance Schedule ..................................................................................................... 19
8 Overhaul...................................................................................................................................20
9 Decommissioning.....................................................................................................................20
9.1 Dismantling and Disposal ................................................................................................. 20
10 Spare Parts................................................................................................................................21
11 Troubleshooting .......................................................................................................................22
12 Technical Data..........................................................................................................................26
13 EU Declaration of Conformity...................................................................................................28

Safety | 1
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1 Safety
Prior to handling the machine, this instruction manual should be read and understood. If
anything needs to be clarified, please contact your Busch representative.
Read this manual carefully before use and keep for future reference.
This instruction manual remains valid as long as the customer does not change anything
on the product.
The machine is intended for industrial use. It must be handled only by technically trained
personnel.
Always wear appropriate personal protective equipment in accordance with the local
regulations.
The machine has been designed and manufactured according to state-of-the-art meth-
ods. Nevertheless, residual risks may remain. This instruction manual highlights potential
hazards where appropriate. Safety notes and warning messages are tagged with one of
the keywords DANGER, WARNING, CAUTION, NOTICE and NOTE as follows:
DANGER
... indicates an imminent dangerous situation that will result in death or serious injuries if
not prevented.
WARNING
... indicates a potentially dangerous situation that could result in death or serious injuries.
CAUTION
... indicates a potentially dangerous situation that could result in minor injuries.
NOTICE
... indicates a potentially dangerous situation that could result in damage to property.
NOTE
... indicates helpful tips and recommendations, as well as information for efficient and
trouble-free operation.

2 | Product Description
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2 Product Description
NOTE
Technical term.
In this instruction manual, we consider that the term ‘machine’ refers to the ‘vacuum
pump’.
NOTE
Illustrations
In this instruction manual the illustrations may differ from the machine appearance.
OUTINMTB
AOUT OPO AOUT
AIN SSIOPIAIN
IDS
AIN Alternative side suction connections* AOUT Alternative side discharge connections**
IDS Integral discharge separator IN Suction connection
MTB Motor terminal box OPI Operating liquid inlet
OPO Operating liquid outlet OUT Discharge connection
SSI Shaft seal flushing inlet***
* No manifold, both connections to be used.
** For installations where gas and liquid are discharged to open gutter, both connec-
tions open.
*** Supplied only when no internal flushing.

Product Description | 2
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FIGURE 1 FIGURE 2
FIGURE 3 FIGURE 4
Gas
Discharge
Gas Discharge
Gas and
Liquid
Discharge
Gas Discharge
Liquid
Discharge
Drain Drain
Drain
Drain
Suction
SuctionSuction
Suction
Makeup
Overflow
Makeup
Overflow
IDS GV
PG
SSC
SSI
CG
OPC
OPI
ADV
OPDGPD
ICV
SV LLI HX
ADV Automatic drain valve CG Compound pressure gauge
GPD Gland packing drain GV Vacuum gauge
HX Heat exchanger ICV Inlet check valve
IDS Integral discharge separator LLI Liquid level indicator
OPC Operating liquid control OPD Operating liquid drain
OPI Operating liquid inlet PG Pressure gauge
SSC Shaft seal flushing control SSI Shaft seal flushing inlet
SV Separator vessel
2.1 Description of Figures 1 - 4
• Figure 1 shows the general standard once through arrangement with integral dis-
charge separator manifold.
• The arrangements of figure 2 (partial recirculation) and 3 (total recirculation) are for
handling combustible, corrosive and explosive gases as well as the gas which is re-
quired to be recycled. If the working liquid is recirculated in the system as shown in
figure 3, then a heat exchanger should be used for cooling the liquid.
• Figure 4 shows the arrangement where gas and water leave from the side flange of
the vacuum pump and discharge directly into the gutter.

2 | Product Description
6 / 32 0870231039_LG_LR_-_IM_en
NOTICE
If applying the configuration shown in figure 4.
The discharge pressure will rise and lead to an increase in shaft power.
• Make sure the cross-sectional area of the gutter is large enough.
NOTICE
If recirculation of the service liquid is not required.
Drainage of the liquid should comply with the appropriate environmental regulations.
WARNING
If handling gas that is flammable or toxic.
Risk of severe injury!
• The drained liquid should be separated twice and transferred to a safe place when ap-
plying the figure 1 arrangement. Particular care should be taken to avoid any leakage
of dangerous gases from the water drain outlet.
WARNING
If applying the configuration shown in figures 2 and 3.
The gas leakage should be controlled according to the local conditions.

Product Description | 2
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2.2 Operating Principle
INLET
DISCHARGE
SIDE INLET
SIDE
DISCHARGE
The machine works on the liquid ring principle.
An eccentrically mounted impeller rotates in a housing partially filled with operating li-
quid (usually water). The impeller blades dip into the fluid, and the centrifugal force ex-
erted by their rotation forms a so-called liquid ring within the housing. The pumped me-
dium is transported in the spaces between the blades and the liquid ring. The eccentric
rotation of the impeller alters the volume of these spaces, causing gas to be drawn in,
compressed and expelled.
2.3 Application
The machine is intended for the suction of air, vapour and other gases.
For explosive gases and vapours (if a "Ex(inside)" sign is written on the nameplate),
please refer to the ATEX supplement for additional safety information on operation in
hazardous zones.
Conveying of other media leads to an increased thermal and/or mechanical load on the
machine and is permissible only after a consultation with Busch.
The machine is intended for the placement in a non-potentially explosive environment.
The machine is capable of maintaining ultimate pressure, see Technical Data [►26].
The machine is suitable for continuous operation.
Permitted environmental conditions, see Technical Data [►26].
2.4 Start Controls
The machine comes without start controls. The control of the machine is to be provided
in the course of installation.
2.5 Variants
2.5.1 LG Series
Dolphin LG’s are single-stage vacuum pumps and operate from atmospheric pressure to
160 hPa (mbar) ultimate pressure.
2.5.2 LR Series
Dolphin LR’s are single-stage vacuum pumps and operate from atmospheric pressure to
33 hPa (mbar) ultimate pressure.

3 | Transport
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3 Transport
WARNING
Suspended load.
Risk of severe injury!
• Do not walk, stand or work under suspended loads.
• The crane and slings must be capable of lifting the weight of the pump.
Machine weight:
see the technical data or the nameplate
Use appropriate slings
• The machine weight is marked on the nameplate.
• Generally, the lifting point should be on the baseplate on which the machine is in-
stalled.
• The lifting point of a bare shaft pump is shown above.
• Check the machine for transport damage.

Storage | 4
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4 Storage
NOTICE
Storage temperature below +5°C.
Risk of damage to the machine!
• Drain the operating liquid from the machine and the system before storage.
• Or add an anti-freeze solution.
After testing, all Busch Dolphin vacuum pumps are vented and drained.
4.1 Short Term (Up to 3 Months)
• Seal all apertures with adhesive tape or provided caps.
If possible:
• Store the machine indoors, dry, dust free and if possible in original packaging
preferably at temperatures between +5 … 55 °C.
4.2 Medium Term (3 Months to 6 Months)
• Remove the shaft coupling guard (if not supplied as a bare shaft machine).
• Rotate the machine shaft by hand weekly to prevent bearing indentation.
• Leave the shaft at approximately 90 degrees to the original position, using a tempor-
ary mark on the shaft to assist.
• Replace the coupling guard, taking care to align correctly and ensure that all fasteners
are replaced and fully tightened.
• Where shaft seal is gland packing, loosen the packing gland plate.
4.3 Long Term (Over 6 Months)
If the machine is constructed in cast iron material:
• Preserve internals by using a combined VPI (Vapour Phase Inhibitor) and Contact In-
hibitor Oil at a recommended concentration of 1 litre per m3 to prevent the machine
from corroding. Ensure all apertures are sealed after application.
• Remove the shaft coupling guard (if not supplied as a bare shaft machine).
• Rotate the machine shaft by hand weekly to prevent bearing indentation.
• Leave the shaft at approximately 90 degrees to the original position, using a tempor-
ary mark on the shaft to assist.
• Coat the exposed shaft ends and shaft coupling with wax preservative or heavy
grease.
• Replace the coupling guard, taking care to align correctly and ensure that all fasteners
are replaced and fully tightened.

5 | Installation
10 / 32 0870231039_LG_LR_-_IM_en
5 Installation
5.1 Installation Conditions
NOTICE
Use of the machine outside of the permitted installation conditions.
Risk of premature failure!
Loss of efficiency!
• Take care that the installation conditions are fully complied with.
• Make sure that the environment of the machine is not potentially explosive.
• Make sure that the ambient conditions comply with the Technical Data [►26].
• Make sure that the environmental conditions comply with the protection class of the
motor.
• Make sure that the installation space or location is vented such that sufficient cooling
of the machine is provided.
• Make sure that cooling air inlets and outlets of the motor fan are not covered or ob-
structed and that the cooling air flow is not affected adversely in any other way.
• Make sure that enough space remains for maintenance work.
• Make sure that the machine is placed or mounted horizontally on a flat surface.
• Make sure that the machine is connected to an operating liquid system, see Operating
Liquid Connection [►12].
• Make sure that all provided covers, guards, hoods, etc. are mounted.
In case of a machine delivery without motor:
• Make sure that the coupling is correctly aligned, see Fitting the Coupling [►15].
If the machine is installed at an altitude greater than 1000 meters above sea level:
• Contact your Busch representative, the motor should be derated or the ambient
temperature limited.
5.2 Connecting Lines / Pipes
• Remove all protective covers before installation.
• Make sure that the connection lines cause no stress on the machine‘s connection; if
necessary use flexible joints.
• Make sure that the line size of the connection lines over the entire length is at least as
large as the connections of the machine.
In case of very long connection lines it is advisable to use larger line sizes in order to
avoid a loss of efficiency. Seek advice from your Busch representative.

Installation | 5
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5.2.1 Suction Connection
NOTICE
Ingress of foreign objects.
Risk of damage to the machine!
If the inlet gas contains foreign solid particles:
• Install a suitable inlet screen (smaller than 0.4 mm mesh size) upstream of the ma-
chine.
Connection size(s):
– DN250 PN10 (for LG 0890 A and LR 0700 A)
– DN300 PN10 (for LG 1200 A and LR 1190 A)
– DN350 PN10 (for LG 1910 A and LR 1560 A)
– DN400 PN10 (for LG 2680 A and LR 2200 A)
5.2.2 Discharge Connection
NOTICE
Too high elevation or lack of separation.
Will cause back pressure and possible drive motor overload!
• The discharge piping on machines without integral separator manifold should not ex-
ceed an elevation of more than 1000 mm above the discharge flange (OUT) of the
machine until the liquid is separated.
Connection size(s):
– DN250 PN10 (for LG 0890 A and LR 0700 A)
– DN300 PN10 (for LG 1200 A and LR 1190 A)
– DN350 PN10 (for LG 1910 A and LR 1560 A)
– DN400 PN10 (for LG 2680 A and LR 2200 A)
• Make sure that the discharged gas will flow without obstruction. Do not shut off or
throttle the discharge line or use it as a pressurised air source.

5 | Installation
12 / 32 0870231039_LG_LR_-_IM_en
5.2.3 Operating Liquid Connection
I
G (SSI) F (OPI)
H
K J (ADV)K
F Operating liquid inlet (OPI) G Shaft seal flush connection (SSI)
H Clean and drain connection I Stuffing box drain plug
J Automatic drain valve (ADV) K Casing drain plugs
Connection sizes:
Machine type F G H I J K
LG 0890 A G2" G1" G1½" G¾" G1" G¾"
LG 1200 A DN 65 PN 10 DN 25 PN 10 G1½" G¾" G1" G¾"
LG 1910 A DN 80 PN 10 DN 25 PN 10 G2" G¾" G1" G¾"
LG 2680 A DN 80 PN 10 DN 25 PN 10 G1½" G¾" G1" G¾"
LR 0700 A DN 50 PN 10 DN 20 PN 10 G1½" G¾" G1" G¾"
LR 1190 A DN 65 PN 10 DN 25 PN 10 G1½" G¾" G1" G¾"
LR 1560 A DN 80 PN 10 DN 25 PN 10 G2" G¾" G1" G¾"
LR 2200 A DN 80 PN 10 DN 25 PN 10 G1½" G¾" G1" G¾"
• Make sure that the operating liquid complies with the requirements, see Operating Li-
quid Settings [►12].
5.3 Operating Liquid Settings
The machine cannot operate without an operating liquid system. The actual scope of de-
livery is always contractually agreed upon.

Installation | 5
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The condition of both the operating liquid and the conveyed media depend on the phys-
ical conditions pressure and temperature.
At a very low pressures and sufficiently high temperatures the operating liquid can locally
transfer into the vapour phase, creating bubbles within the operating liquid. This process
is called “cavitation” and may deteriorate the machine and its performance, see Prevent-
ing Cavitation [►18].
Recommended operating liquid (water) settings at various inlet pressures:
LG 0890 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
490
472
420
372
330
16.6 - 17.5
16.0 - 17.0
14.5 - 15.0
12.8 - 13.5
11.5 - 12.0
14.7 - 16.6
14.2 - 16.0
12.6 - 14.5
11.2 - 12.5
9.9 - 11.5
10.8 - 14.7
10.3 - 14.2
9.2 - 12.6
8.1 - 11.2
7.2 - 9.9
7.5 - 10.8
6.7 - 10.3
5.9 - 9.2
5.3 - 8.1
4.7 - 7.2
LG 1200 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
420
372
330
298
266
23.5 - 24.1
20.5 - 21.3
18.5 - 18.9
16.5 - 17.1
14.5 - 15.3
20.5 - 23.5
18.2 - 20.5
16.1 - 18.5
14.5 - 16.5
13.0 - 14.9
15.0 - 20.5
13.3 - 18.2
11.8 - 16.1
10.6 - 14.5
9.5 - 13.0
9.6 - 15.0
8.5 - 13.3
7.5 - 11.8
6.8 - 10.6
6.1 - 9.5
LG 1910 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
398
372
330
298
266
236
37.0 - 38.0
34.5 - 35.5
30.5 - 31.5
27.5 - 28.5
24.5 - 25.5
21.5 - 22.5
37.5 - 31.9
29.8 - 35.0
26.4 - 31.0
23.9 - 27.5
21.3 - 25.0
18.9 - 22.2
23.3 - 31.9
21.8 - 29.8
19.3 - 26.4
17.5 - 23.9
15.6 - 21.3
13.8 - 18.9
15.0 - 23.3
14.0 - 21.8
12.4 - 19.3
11.2 - 17.5
10.0 - 15.6
8.9 - 13.8
LG 2680 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
330
298
266
236
210
197
50.0 - 52.0
45.0 - 46.0
40.0 - 43.0
36.0 - 38.0
32.0 - 34.0
30.0 - 32.0
44.2 - 51.8
39.9 - 46.8
35.6 - 41.8
31.6 - 37.1
28.1 - 33.0
26.3 - 28.3
32.3 - 44.2
29.2 - 39.9
26.1 - 35.6
23.1 - 31.6
20.6 - 28.1
19.0 - 26.3
20.7 - 32.3
18.7 - 29.2
16.7 - 26.1
14.8 - 23.1
13.2 - 20.6
12.0 - 19.0

5 | Installation
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LR 0700 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
490
472
420
372
330
19.0 - 20.0
17.5 - 18.5
15.5 - 16.5
13.5 - 14.5
12.0 - 13.0
15.5 - 16.5
14.0 - 15.0
12.5 - 13.5
11.0 - 12.0
9.5 - 10.5
13.0 - 14.0
11.5 - 12.5
10.0 - 11.0
9.0 - 10.0
8.0 - 9.0
6.5 - 7.5
5.5 - 6.5
5.0 - 6.0
4.5 - 5.5
4.0 - 5.0
LR 1190 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
472
420
372
330
298
266
22.1 - 22.6
19.6 - 20.1
17.1 - 17.8
15.4 - 15.8
13.8 - 14.2
12.4 - 12.8
19.2 - 22.1
17.1 - 19.6
15.2 - 17.1
13.4 - 15.4
12.1 - 13.8
10.9 - 12.4
14.1 - 19.2
12.5 - 17.1
11.1 - 15.2
9.9 - 13.4
8.9 - 12.1
7.9 - 10.9
9.0 - 14.1
7.9 - 12.5
7.1 - 11.7
5.9 - 9.9
5.7 - 8.9
5.1 - 7.9
LR 1560 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
398
372
330
298
266
236
30.8 - 31.7
28.7 - 29.6
25.4 - 26.3
22.9 - 23.7
20.4 - 21.2
17.9 - 18.7
26.6 - 30.8
24.9 - 28.7
22.0 - 25.4
19.9 - 22.5
17.7 - 21.2
15.8 - 17.9
19.4 - 26.6
18.1 - 24.9
16.0 - 22.0
14.0 - 19.9
13.0 - 17.7
11.5 - 15.8
12.5 - 19.4
11.7 - 18.1
10.3 - 16.0
9.4 - 17.5
8.3 - 13.0
7.4 - 11.5
LR 2200 A
Speed
r/min
< 200 mbar
m³/h
200 - 400 mbar
m³/h
400 - 600 mbar
m³/h
> 600 mbar
m³/h
330
298
266
236
210
41.2 - 42.8
37.1 - 37.9
33.0 - 35.4
29.7 - 31.3
26.4 - 28.0
36.4 - 42.7
37.1 - 38.5
29.3 - 34.0
26.0 - 30.6
23.2 - 27.2
26.6 - 36.4
24.1 - 32.9
21.5 - 29.3
19.1 - 26.0
17.0 - 23.2
17.1 - 26.6
15.4 - 24.1
13.7 - 21.5
12.2 - 19.1
10.9 - 17.0
Water pressure before flow regulation valve
(once through operation only)
bar(g) 1
Max. allowable supply temperature °C 80
Max. allowable kinematic viscosity mm2/s 20
Consider the motor power for
anything other than water -
consult Busch.
Max. allowable particle size mm 0.4*

Installation | 5
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* For all operating systems make sure that no particles with a diameter larger than 0.4
mm will intrude the machine, neither via the process gas nor via the operating liquid.
Use suitable filtration as necessary.
The table below lists the recommended maximum levels of soluble compounds for use
with machine in cast iron construction.
Calcium carbonate mg/l (ppm) < 300**
PH value 6.5 … 9.5
Chloride mg/l (ppm) < 700
Sulphates mg/l (ppm) < 200
Nitrites mg/l (ppm) < 500***
Total dissolved solids mg/l (ppm) < 1000
** to prevent excessive built-up of scale
*** provided long period of exposure to stagnant water is not foreseen
NOTE
Stainless steel version.
Please note that machines in all stainless steel material offer higher levels of corrosion
resistance and can be used for operation outside of the above limits. Chemical compat-
ibility should always be checked by competent personnel before use, particular atten-
tion should be paid to elastomer material selection. If in doubt, please consult Busch.
5.4 Fitting the Coupling
WARNING
Unprotected coupling.
Risk of severe injury!
• Make sure that the coupling is protected by a cover or a guard.
In case of a machine supplied without a motor:
• Fit a suitable coupling that matches the machine and motor shaft size.
• Make sure that the coupling is sized to withstand the full motor torque.
• Make sure that the coupling is correctly aligned according to the coupling instructions.
• Install a protective cover or a guard.
Machine type Machine shaft size (mm)
LG 0890 A & LR 0700 A 140
LG 1200 A & LR 1190 A 160
LG 1910 A & LR 1560 A 180
LG 2680 A & LR 2200 A 200

5 | Installation
16 / 32 0870231039_LG_LR_-_IM_en
5.5 Electrical Connection
DANGER
Live wires.
Risk of electrical shock.
• Electrical installation work must only be executed by qualified personnel.
• Make sure that the power supply for the motor is compatible with the data on the
nameplate of the motor.
• The electrical installation must comply with applicable national and international
standards.
• Provide a lockable disconnect switch on the power line so that the machine is com-
pletely secured during maintenance tasks.
• Provide an overload protection according to EN 60204-1 for the motor.
• Make sure that the motor of the machine will not be affected by electric or electro-
magnetic disturbance from the mains; if necessary seek advice from Busch.
• Connect the protective earth conductor.
• Electrically connect the motor.
NOTICE
The motor frequency is too low.
Loss of efficiency, not enough power to create the sealing liquid ring.
• The motor speed must always be higher than the minimum speeds shown in the
Technical Data [►26].
5.5.1 Wiring Diagram Three-Phase Motor
NOTICE
Incorrect direction of rotation.
Risk of damage to the machine!
• Operation in the wrong direction of rotation can destroy the machine in a short time!
Prior to start-up, ensure that the machine is operated in the right direction.
NOTICE
Incorrect direction of rotation.
Risk of damage to the vacuum system!
• Operating the vacuum system with the rotation in the wrong direction can result in
the operating liquid flowing back to the vacuum system. Prior to start-up, check for
correct direction of rotation.
The intended rotation direction of the motor is defined by the illustration below:

Commissioning | 6
0870231039_LG_LR_-_IM_en 17 / 32
IN
OUT
• Watch the fan wheel of the motor and determine the direction of rotation just before
the fan wheel stops.
If the rotation of the motor must be changed:
• Switch any two of the motor phase wires.
For motor wiring and wiring diagrams, please refer to motor manufacturers instruction
manuals.
6 Commissioning
CAUTION
During operation the surface of the machine may reach temperatures of more than
70°C.
Risk of burns!
• Avoid contact with the machine during and directly after operation.
NOTICE
The machine is running without operating liquid system.
Will ruin the machine in short time!
• Prior to commissioning, the operating and shaft seal flushing liquid system must be
connected and open.
NOTICE
Ingress of foreign objects.
Risk of damage to the machine!
• It is recommended to install a temporary stainless steel inlet screen (smaller than 0.4
mm mesh size) during commissioning.
• Make sure that the installation conditions (see Installation Conditions [►10]) are
met.
Before operating the machine:

6 | Commissioning
18 / 32 0870231039_LG_LR_-_IM_en
• Make sure that the operating liquid level is at the machine shaft centre.
• Check the operation of all automatic valves before start up
– Machines with gland packing for shaft sealing: loosen the packing gland plate and
apply a few drops of oil to the packing for lubricating purpose.
– Ensure external shaft sealing liquid is available to packing gland or double cartridge
mechanical seal before switching on the machine. Supply pressure for packing gland
0.1 to 0.3 bar(g) with flow rate to suitably lubricate the packing.
– For mechanical seal supply pressure and flow rate, see manufacturers instructions for
the contract.
• Switch on the machine.
• Make sure that the maximum permissible number of starts does not exceed the re-
commendation from the motor manufacturer.
After a few seconds of operation:
• Turn on/activate the operating liquid system device.
• Make sure that the operating conditions comply with the Technical Data [►26].
As soon as the machine is operated under normal operating conditions:
• Measure the motor current and record it as reference for future maintenance and
troubleshooting work.
– Machines with gland packing for shaft sealing require the gland to be adjusted dur-
ing operation. Uniformly tighten the gland plate so that the liquid leakage along the
shaft from the packing is 45 to 60 drips per minute.
6.1 Preventing Cavitation
NOTICE
Cavitation.
Risk of damage to the machine!
If you hear crackling noise:
• Control the pressure.
At very low pressures and sufficiently high temperatures the operating liquid can locally
transfer into the vapour phase, creating bubbles within the operating liquid. As the pres-
sure rises towards the outlet slot the bubbles collapse. This process is called cavitation.
In case of bubbles that have been located on surfaces the operating liquid cannot intrude
the cavity left by the bubble equally from all directions. Instead the inflowing liquid hits
the surface with high speed. This causes erosion, which can destroy the machine rapidly.
The formation of bubbles also deteriorates the pump performance. Cavitation is clearly
audible by its crackling noise.
The working pressure of the vacuum pump shall therefore be sufficiently above the va-
pour pressure of the operating liquid. In particular the pressure control in the vacuum
system must by no means be achieved by throttling or even closing of the suction line!
The vapour pressure of the operating liquid and consequently the ultimate pressure can
be reduced by cooling. However, this increases the cooling water flow considerably. In
most cases the low ultimate pressure is not required and cavitation shall be avoided by
means of vacuum limitation rather than cooling.

Maintenance | 7
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7 Maintenance
WARNING
Machines contaminated with hazardous material.
Risk of poisoning!
Risk of infection!
If the machine is contaminated with hazardous material:
• Wear appropriate personal protective equipment.
CAUTION
Hot surface.
Risk of burns!
• Prior to any action requiring touching the machine, let the machine cool down first.
• Shut down the machine and lock against inadvertent start up.
• Turn off the operating liquid system.
• Vent the connected lines to atmospheric pressure.
If necessary:
• Drain the operating liquid
• Disconnect all connections
7.1 Maintenance Schedule
The maintenance intervals depend very much on the individual operating conditions. The
intervals given below are desired to be considered as starting values which should be
shortened or extended as appropriate. Particularly harsh applications or heavy duty oper-
ation, such as high dust loads in the environment or in the process gas, other contamina-
tion or ingress of process material, can make it necessary to shorten the maintenance in-
tervals significantly.
Interval Maintenance work
Monthly • Check for abnormal noise, see Troubleshooting
[►22].
• Check for excessive vibration, see problem “Vibration
is high” in chapter Troubleshooting [►22].
• Check the operating liquid temperature, see Operat-
ing Liquid Connection [►12].
• Check the machine for liquid leaks - in case of leaks
have the machine repaired (contact Busch).
• If applicable, check gland packing leakage rate (45 to
60 drips per minute) and adjust as required.
Every 2500 operating hours • Regrease the bearings. The amount of grease ac-
counts for 2/3 of the free space of the bearing cham-
ber.
• Check the tension on the v-belt (if applicable).

8 | Overhaul
20 / 32 0870231039_LG_LR_-_IM_en
Every year • Carry out a visual inspection on the machine to check
for dust and dirt. Avoid using any cleaning products
which may result in damage to the pump label or
paint.
• If applicable, gland packing has to be replaced annu-
ally or sooner if readjustment is no longer possible.
If an inlet screen is installed:
• Check it and clean if necessary.
Every 5 years • Have a major overhaul (contact Busch).
8 Overhaul
WARNING
Machines contaminated with hazardous material.
Risk of poisoning!
Risk of infection!
If the machine is contaminated with hazardous material:
• Wear appropriate personal protective equipment.
NOTICE
Improper assembly.
Risk of premature failure!
Loss of efficiency!
• It is highly recommended that any dismantling of the machine that goes beyond any-
thing that is described in this manual should be done through Busch.
In case of the machine having conveyed gas that was contaminated with foreign materi-
als which are dangerous to health:
• Decontaminate the machine as much as possible and state the contamination
status in a ‘Declaration of Contamination’.
Busch will only accept machines that come with a completely filled in and legally binding
signed ‘Declaration of Contamination’ (form downloadable from
www.buschvacuum.com).
9 Decommissioning
• Shut down the machine and lock against inadvertent start up.
• Vent the connected lines to atmospheric pressure.
• Disconnect all connections.
If the machine is going to be stored:
• See Storage.
9.1 Dismantling and Disposal
• Separate special waste from the machine.
• Dispose of special waste in compliance with applicable regulations.
• Dispose of the machine as scrap metal.