Atlas Copco GVD 175 User manual

Instruction Book
6996 0220 90
Issue C
Atlas Copco
Oil-sealed dual stage rotary
vane vacuum pumps
GVD 175, GVD 275

Atlas Copco Airpower n.v. Part of the Atlas Copco Group
Postal address Visitors address Phone: +0032 (0)3 - 870 2111
P.O. Box 100 Boomsesteenweg 957 Fax: +0032 (0)3 - 870 2443
B-2610 Wilrijk-Antwerp B-2610 Wilrijk-Antwerp Email: [e-mail]
Belgium Belgium Registration n°: BE0403.992.231
www.atlascopco.com For info, please contact your local Atlas Copco representative
Form 5009 5013 01 ed.
01, 2016-04-20
EU DECLARATION OF CONFORMITY
We, Atlas Copco Airpower n.v., declare under our sole responsibility, that the product
Machine name VACUUM PUMP
Machine type GVD40, GVD80, GVD175, GVD275
Serial number This declaration covers all product serial numbers from the date this Declaration was signed
onwards.
Which falls under the provisions of article 12.2 of the EC Directive 2006/42/EC on the approximation of the
laws of the Member States relating to machinery, is in conformity with the relevant Essential Health and
Safety Requirements of this directive.
The machinery complies also with the requirements of the following directives and their amendments as
indicated.
Directive on the approximation of laws of the
Member States relating to
Harmonized and/or Technical
Standards used
Att’
mnt
Machinery safety
2006/42/EC
EN 1012 – 2 :
1996/A1:2009
Low voltage equipment
2014/35/EU
EN 60034-1 :
2010
Atlas Copco Airpower n.v. is authorized to compile the technical file.
Conformity of the product
to the specification and by implication to the
directives
Engineering
Andries Desiron
20-04-2016
Qingdao
Issued by
Name
Signature
Date
Place

GVD 175, GVD 275
Instruction book
Original instructions
Copyright notice
Any unauthorised use or copying of the contents or any part thereof is prohibited.
This applies in particular to trademarks, model denominations, part numbers and drawings.
This instruction book is valid for CE as well as non-CE labelled machines. It meets the
requirements for instructions specified by the applicable European directives as identified in the
Declaration of Conformity.
Atlas Copco
Oil-sealed dual stage rotary vane vacuum pumps
6996 0220 90 Issue C
www.atlascopco.com

1 6996 0220 90 Issue C
Instruction Book
Table of Contents
1 Introduction ..................................................................................................................4
1.1 Scope and definitions .................................................................................................... 4
1.2 Description ..................................................................................................................... 6
1.3 Gas ballast ..................................................................................................................... 7
2 Technical data .............................................................................................................. 8
2.1 Operating and storage conditions .................................................................................. 8
2.2 Performance .................................................................................................................. 8
2.3 Dimensional data ........................................................................................................... 9
2.4 Mechanical data ........................................................................................................... 10
2.5 Electrical data: three-phase motors ............................................................................. 10
2.6 Lubrication data ........................................................................................................... 11
3 Installation ..................................................................................................................12
3.1 Safety ........................................................................................................................... 12
3.2 System design considerations ..................................................................................... 12
3.3 Unpack and inspect ..................................................................................................... 13
3.4 Locate the pump .......................................................................................................... 13
3.5 Connect the pump to the cooling water ....................................................................... 14
3.6 Fill the pump with oil .................................................................................................... 14
3.7 Electrical installation .................................................................................................... 15
3.8 Connect the pump inlet to your system ....................................................................... 16
3.9 Connect the pump outlet to your system ..................................................................... 17
3.10 Gas-ballast inlet connection ......................................................................................... 18
3.11 Leak-test the system .................................................................................................... 18

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4 Operation .................................................................................................................... 19
4.1 Gas-ballast control ....................................................................................................... 19
4.2 Start-up procedure ....................................................................................................... 19
4.3 To achieve ultimate vacuum ........................................................................................ 20
4.4 To pump condensable vapours ................................................................................... 20
4.5 To decontaminate the oil ............................................................................................. 20
4.6 Unattended operation .................................................................................................. 21
4.7 Shut-down .................................................................................................................... 21
5 Maintenance ............................................................................................................... 22
5.1 Safety ........................................................................................................................... 22
5.2 Maintenance plan ........................................................................................................ 23
5.3 Check the oil-level ....................................................................................................... 23
5.4 Replace the oil .............................................................................................................24
5.5 Clean the fine oil-filter .................................................................................................. 25
5.6 Replace the gas-ballast filter ....................................................................................... 26
5.7 Inspect and clean the inlet-filter ................................................................................... 27
5.8 Clean the motor fan-cover ........................................................................................... 27
5.9 Clean and overhaul the pump ...................................................................................... 28
5.10 Test the motor condition .............................................................................................. 28
5.11 Fit new blades .............................................................................................................. 28
5.12 Basic fault-finding ........................................................................................................28
6 Storage and disposal ................................................................................................ 31
6.1 Storage ........................................................................................................................ 31
6.2 Disposal ....................................................................................................................... 31
7 Service, spares and accessories ............................................................................. 32

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7.1 Introduction .................................................................................................................. 32
7.2 Service ......................................................................................................................... 32
7.3 Spares ......................................................................................................................... 32
7.4 Accessories .................................................................................................................32
Illustrations
1 The GVD 175, GVD 275 pump ...................................................................................... 5
2 Dimensions GVD 175, GVD 275 (mm) .......................................................................... 9
3 Oil level indication ........................................................................................................ 15
4 Remove and replace filter-element .............................................................................. 25
5 Remove and replace gas-ballast filter-elements .......................................................... 26
6 Remove and replace inlet-filter .................................................................................... 27
Tables
1 Electrical data .............................................................................................................. 10
2 Maintenance plan ........................................................................................................ 23
Associated publications
Publication title Publication number
Vacuum pump and vacuum system safety 6996 0222 10
TIGOL 68 0017 5202 47

6996 0220 90 Issue C 4
Instruction Book
1 Introduction
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for the Atlas Copco
GVD 175 and GVD 275 Rotary Vacuum Pumps. You must use your pump as specified in this
manual. Read this manual before you install and operate your pump.
Important safety information is highlighted as WARNING and CAUTION instructions; you
must obey these instructions. The use of WARNINGS and CAUTIONS is defined below.
The units used throughout this manual conform to the SI international system of units of
measurement.
The following warning symbol is on the pump:
WARNING
Warnings are given where failure to observe the instruction could
result in injury or death to people.
CAUTION
Cautions are given where failure to observe the instruction could result in
damage to the equipment, associated equipment and process.
WARNING
refer to accompanying documentation.
WARNING
risk of electric shock.
WARNING
hot surfaces.
WARNING
do not block the pump exhaust.

5 6996 0220 90 Issue C
Instruction Book
Figure 1 – The GVD 175, GVD 275 pump
Reference Designation Reference Designation
(1) Gas-ballast control (6) Oil-filter location
(2) Oil filler-plug (7) Oil pressure-gauge
(3) Outlet-port (8) Oil-level sight-glass
(4) Inlet-port (9) Oil drain-tap
(5) Motor terminal-box (10) Cooling-water connections

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Instruction Book
1.2 Description
The Atlas Copco rotary vacuum pump is shown in Figure 1. Refer to Figure 1for item numbers
in brackets in the following descriptions.
The GVD 175 and GVD 275 pumps are two-stage oil-sealed, high-vacuum pumps designed for
reliable, long-term operation in both laboratory and industrial environments. A four-pole
three-phase motor provides direct-drive through a flexible coupling. The pumps are
free-standing mounted on steel runners.
These pumps are not suitable for use with Hazardous substances. These would include:
Pyrophoric gases
Oxygen >25%
Chemically Active e.g. Azide forming compounds
Corrosive gases
Flammable mixtures
The GVD pumps are two-stage, oil-sealed, sliding-vane vacuum pumps.
Lubrication is provided by a sliding-vane oil pump. Oil is drawn into the pump through a wire
mesh strainer. The oil is pumped to a spring-loaded distributor valve. The distributor valve
directs a lightly-pressurised supply of oil to the main vacuum-pump and by-passes the excess
back to the oil reservoir. Some of the excess oil is re-directed through a large area, fine-pore
filter and some through a relief-valve. When the pump is switched off, the spring-loaded
distributor valve provides oil and air suckback protection.
You can inspect the level and condition of oil in the oil box through an oil-level sight-glass (8).
An oil filler-plug (2) is fitted at the top of the oil box. An oil drain-tap (9) is fitted at the bottom
of the oil box.
The pump has an inlet-port (4) with a DN63 ISO-F flange and the outlet-port (3) is compatible
with DN40 ISO-KF fittings.
The gas-ballast control (1) allows you to control the introduction of gas-ballast when pumping
high vapour loads. Refer to Section 1.3 for more information about gas-ballast.
Your pump is water cooled. A thermostatic controlled valve regulates water flow. This will
ensure optimum pump working temperature, maintain economies in water use, and provide
assistance with gas-ballast protection.
Refer to Section 7for details about recommended accessories.

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Instruction Book
1.3 Gas ballast
To pump high vapour loads, gas-ballast is delivered into the pump to prevent condensation of
the vapour carried by the pumped gases. This system reduces oil contamination and pump
corrosion caused by condensed vapour from the pumped gases.
You can introduce air or an inert gas into the low vacuum stage of the pump through the gas-
ballast inlet (Figure 1, item 1). A filter/silencer is fitted in the gas-ballast system, to prevent the
entry of dust into the pump and to improve silencing. You can control the gas-ballast either
manually or remotely.
For manual control, use the gas-ballast control (Figure 1, item 1). The pumps are supplied with
an open-gas-ballast inlet. If you leave this inlet open to the atmosphere, then:
With the gas-ballast control (Figure 1, item 1) open, when you switch the pump off, the
pressure inside the pump will rise to atmospheric pressure.
With the gas-ballast control closed, when you switch off the GVD 175 and GVD 275
pumps the vacuum will be maintained inside the pump.
For remote control, fit a solenoid-operated gas-ballast control valve to the gas-ballast inlet and
open the gas-ballast control. Connect the gas-ballast valve to your control system so that the
valve is closed when the pump is switched off and if the electrical supply to the pump is
interrupted. Under these circumstances, when the pump is switched off, the vacuum will be
maintained inside the pump.
It should be noted that when the pump is switched off the system pressure is unaffected by the
operation of the gas ballast. The vacuum is maintained in the system by closing the pump inlet
valve.
For more information about the use of gas-ballast, refer to Section 3.10 and 4.1.

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Instruction Book
2 Technical data
2.1 Operating and storage conditions
2.2 Performance
Parameter Data
Ambient temperature range (operation) 12 to 40°C
Normal surface temperature of the pump body 50 to 70°C
(at ultimate vacuum ambient temperature of 20°C)
Maximum humidity (operation) 90% RH
Ambient temperature range (storage) -30 to 70°C
NOTE
Where total pressures are shown in the technical data tables, measurements were
takenusinganuntrappedtotalpressurecapacitancediaphragmgaugeonaheader,
as specified by Pneurop standards.
Parameter Units GVD 175 GVD 275
Maximum Displacement
50 Hz electrical supply m3/h 178 292
60 Hz electrical supply m3/h 214 350
Maximum Speed – Pneurop
50 Hz electrical supply m3/h 160 255
60 Hz electrical supply m3/h 196 306
Motor rotational speed
50 Hz electrical supply rpm 1440 1440
60 Hz electrical supply rpm 1720 1720
Ultimate vacuum
without gas-ballast (total pressure) mbar
(Pa) 1 x 10-3 (1 x 10-1)1 x 10-3 (1 x 10-1)
with full gas-ballast (total pressure) mbar
(Pa) 5 x 10-3 (5 x 10-1)5 x 10-3 (5 x 10-1)
Maximum permitted outlet pressure
(at full pump throughput) bar gauge (Pa) 0.5 (1.5 x 105)0.5 (1.5 x 105)
Maximum water vapour inlet pressure
with thermostatic mbar 20 12
water flow valve (Pa) (2 x 103) (12 x 102)
Maximum water vapour pumping rate kg/h 2.4 2.5
Maximum gas-ballast flow m3/h 3 3

9 6996 0220 90 Issue C
Instruction Book
Figure 2 – Dimensions GVD 175, GVD 275 (mm)
2.3 Dimensional data
Dimensions (mm)
Pump A B C D E F G
GVD 175 1011 329 196 1066 256 410 563
GVD 275 1152 425 294 1207 260 415 565

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Instruction Book
2.4 Mechanical data
2.5 Electrical data: three-phase motors
For motor wiring information refer to the wiring diagram supplied in the motor terminal box.
You can configure the dual voltage motors to operate with either the high range or low range
electrical supply.
We endeavour to supply dual voltage motors preset to the highest of the selectable voltages.
For motor current information please refer to the motor rating plate.
Parameter Data
Overall dimensions See Figure 2
Degree of protection (IEC 34-5:1981) IP55
Pump inlet-port DN63 ISO-F (flange with trapped O-ring)
Pump outlet-port compatible with DN40 ISO-KF fittings (flange
centre tapped G1 1/2)
Noise level at 1 metre (dB (A)) *
*The noise level was measured in accordance with ISO2151 and with the pump
running at ultimate pressure. Running at higher inlet pressures will increase the noise
level.
75
Vibration Severity †
†Measured at the inlet port to ISO 2372 (1974)
Class 1C for GVD 175 and Class 1D for GVD
275
Maximum mass (kg) GVD 175 GVD 275
243 260
Table 1 – Electrical data
Pump Voltage (V) Frequency (Hz) Power (kW)
GVD 175 380/400 50 5.5
230/460 60 6.5
200 50 5.5
200/380 60 6.5
GVD 275 380/400 50 7.5
230/460 60 8.5
200 50 7.5
200/380 60 8.5

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2.6 Lubrication data
NOTE
A Safety Data Sheet for the following oil is available on request.
GVD 175 GVD 275
Recommended oil*
*To operate your pump when the ambient temperature is outside the limits specified
in Section 2.1, or to optimise your pump performance when you pump condensable
vapours, you may need to use a different oil.
TIGOL 68
Oil capacity (litres)
Maximum 25 28
Minimum 16 19

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Instruction Book
3 Installation
3.1 Safety
You must ensure that the pump is suitable for your application.
Obey the safety instructions listed below when you install the pump, especially when you
connect the pump into an existing system. Details of specific safety precautions are given at the
appropriate point in the instructions.
The installation of your pump must be performed by a suitably trained and supervised
technician.
Wear the appropriate safety-clothing when you come into contact with contaminated
components.
Vent and purge your vacuum system before you start installation work.
Ensure that the installation technician is familiar with the safety procedures which relate to
the pump-oil and the products handled by the pumping system. Take suitable precautions
to avoid the inhalation of oil mist and excessive skin contact with pump-oil, as prolonged
exposure can be harmful.
Disconnect the other components in the pumping system from the electrical supply so that
they cannot be operated accidentally.
3.2 System design considerations
Consider the following points when you design your pumping system:
Use a suitable valve to isolate the pump from your vacuum system if you need to allow the
pump to warm up before you pump condensable vapours or if you need to maintain
vacuum when the pump is switched off.
Avoid high levels of heat input to the pump from the process gases, otherwise the pump
may overheat and seize.
WARNING
If you use a hydrocarbon oil in this pump, you must not use the
pump to process oxygen in concentrations greater than 25% in
volume. If you do, there is a risk of fire or explosion in the oil-box
of the pump.
WARNING
We do not recommend that you use the GVD 175 and GVD 275
pumps to pump hazardous substances.

13 6996 0220 90 Issue C
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If you use the pump in a high ambient temperature and have a high gas throughput, the
temperature of the pump-body may exceed 70°C. You must fit suitable guards to prevent
contact with hot surfaces.
Make sure that the exhaust pipeline cannot become blocked. If you have an exhaust-
isolation valve, make sure that you cannot operate the pump with the valve closed.
Ensure that a suitable supply of cooling water is available.
3.3 Unpack and inspect
Remove all packing materials, remove the pump from its packing-box, remove the protective
covers from the inlet and outlet-ports and inspect the pump. If the pump is damaged, notify your
supplier and the carrier in writing within three days; state the Item Number of the pump together
with your order number and your supplier’s invoice number. Retain all the packing materials
for inspection. Do not use the pump if it is damaged.
If the pump is not to be used immediately, replace the protective covers. Store the pump in
suitable conditions, as described in Section 6.1.
3.4 Locate the pump
Attach your mechanical lifting equipment to the lifting eyes on the pump.
Provide a firm, level platform for the pump. Locate the pump so that the oil-level sight-glass is
visible and the oil filler-plug, oil drain-tap, disposable oil-filter and gas-ballast control are
accessible. You must ensure that at least 330 mm is allowed, to withdraw the oil-filter from the
pump.
If your pump will be located inside an enclosure, make sure that there is adequate ventilation at
both ends of the pump. There must be a minimum space of 25 mm between the pump and the
enclosure walls.
In addition, ensure that the location of the pump and the intended routing of connecting parts
i.e. process line, exhaust line and power cables will not present any physical hazards. For
example: trip hazards to personnel.
WARNING
Use suitable lifting equipment to move the pump. The mass of the
pump is between 243 kg and 260 kg.

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3.5 Connect the pump to the cooling water
Connect the two G3/8 internally threaded connections to the cooling water supply. The
maximum pressure that can be admitted to the cooling circuit is 3 bar and the recommended
minimum cooling water supply flow rates at 20°C are:
3.6 Fill the pump with oil
3.6.1 Recommended pump oils
It is recommended that you use the oil specified in Section 2.6 of this manual. The ultimate
vacuum of the pump with other oils may be higher than the ultimate vacuum with the
recommended oil. However, note that other oils may contain polymers which may be degraded
during use so that they become thinner. You will, therefore, have to change the oil more
frequently than when you use the oil specified in Section 2.6 of this manual. If necessary, adjust
the maintenance schedule according to your experience.
If you pump oxygen or other dangerous gases and vapours, you must use a chemically inert and
stable oil (such as perfluoropolyether). For information on pumping dangerous gases and
vapours, refer to the Atlas Copco guidelines on vacuum pump and vacuum system safety (see
Associated Publications at the end of the contents list).
3.6.2 Filling procedure
Fill the pump with oil as described below. Refer to Figure 1for the item numbers in brackets.
1. Remove the oil filler-plug (2).
2. Pour oil into the pump until the oil-level just reaches the MAX mark indicated on the bezel
at the top of the sight-glass (8). If the oil-level goes above the MAX mark, open the oil
drain-tap (9) and drain the excess oil from the pump.
3. After a few minutes, recheck the oil-level. If the oil-level is now below the MAX mark,
pour more oil into the pump.
GVD 175 80 l/h
GVD 275 120 l/h

15 6996 0220 90 Issue C
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Figure 3 – Oil level indication
4. Refit the oil filler-plug. Tighten the plug firmly by hand. Do not over-tighten.
3.7 Electrical installation
3.7.1 Connect the pump to your electrical supply
We recommend that you connect the electrical supply to the motor through a starter or circuit
breaker which has thermal over-current protection which can be adjusted to suit the full-load
current ratings shown on the motor rating plate. The fuse ratings must be calculated by a
qualified electrician. The supplier of your thermal over-current protection device may specify
fuse ratings to ensure correct operation of the over-current protection device. Ensure that the
fuse you use is suitable for the starting currents given on the motor rating plate.
WARNING
Ensure that the electrical installation of your pump-motor
conforms with your local and national safety requirements. It must
be connected to a suitably fused and protected electrical supply
and a suitable earth point.
CAUTION
If your pump-motor can be used with more than one voltage range, you must
ensure that the motor is configured for your electrical supply voltage. If you
do not, you may damage the motor.
NOTE
The pump will restart automatically when the electrical supply is restored after an
interruption. If you do not want the pump to restart automatically, use electrical
control equipment which must be reset manually.

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1. Remove the cover from the motor terminal-box.
2. Check your electrical supply voltage and frequency. If necessary, configure the motor to
operate with your electrical supply. For motor wiring information refer to the wiring
diagram supplied in the motor terminal box.
3. Remove the plugs from the cable-entry hole that you will use for the electrical supply
cable. Choose the most suitable hole for your application.
4. Fit a suitable cable-gland and nut to the entry hole. After the supply cable is fitted, the
cable-gland must be a protective seal to the standard of IP55 in IEC 529 or better.
5. Pass the motor electrical supply cable through the cable-gland.
6. Connect the cables to the terminals as shown in the wiring diagram supplied in the motor
terminal box.
3.7.2 Check the direction of rotation
1. Watch the motor cooling-fan through the motor fan-cover.
2. Switch-on the electrical supply to the motor for a few seconds and switch off.
3. Check that the motor cooling-fan rotates in the direction shown by the arrow on the motor
mounting-plate. If the direction of rotation is incorrect:
Isolate the pump from the electrical supply.
Remove the terminal-box cover and swap wires L1 and L3. Refer to the wiring
diagram supplied in the motor terminal box.
Refit the cover to the terminal-box.
Connect the pump to the electrical supply.
Check the direction of rotation again.
3.8 Connect the pump inlet to your system
Connect your vacuum system to the inlet-port (Figure 1, item 4). Use standard 63 mm fittings
when you connect the pump.
CAUTION
Ensure that the pump-motor rotates in the correct direction. If it does not, the
pump and your vacuum system can become pressurised.

17 6996 0220 90 Issue C
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Take note of the following information when you connect the pump to your vacuum system.
For optimum pumping speeds, ensure that the pipeline connected to the inlet-port is as
short as possible and has an internal diameter not less than the inlet-port diameter.
Support the vacuum pipelines to prevent loading of the coupling-joints.
If necessary, incorporate flexible bellows in your system pipelines to reduce the
transmission of vibration and to prevent loading of coupling-joints. If you use flexible
bellows, you must ensure that you use bellows which have a maximum pressure rating
which is greater than the highest pressure that can be generated in your system. You must
use flexible bellows if your pump is mounted on vibration isolators.
Use a suitable valve to isolate the pump from your vacuum system if you need to pump
condensable vapours or maintain vacuum when the pump is switched off.
Use a suitable inlet catchpot if you pump condensable vapours or if you use the pump for
very dusty applications.
Ensure that sealing surfaces are clean and scratch-free.
3.9 Connect the pump outlet to your system
Connect the pump outlet-port to your outlet accessories or your exhaust treatment plant using
DN40 ISO-KF fittings to connect to the outlet flange.
Take note of the following information before you connect to the pump outlet.
The exhaust system must be configured so that the maximum pressure at the pump outlet
does not exceed 0.5 bar gauge (1.5 bar absolute, 1.5 x 105Pa) at full pump throughput.
In the following circumstances, we recommend that you fit an oil mist filter to the pump
outlet:
if you use the pump with the gas-ballast control open
if you operate the pump with an inlet pressure greater than 10 mbar for extended
periods or
if you frequently pump down from atmospheric pressure.
The mist filter will trap the oil exhausted from the pump: you can re-use the oil if it is not
contaminated.
WARNING
Connect the pump outlet to a suitable treatment plant to prevent
the discharge of dangerous gases and vapours to the surrounding
atmosphere. Use a catchpot to prevent the drainage of
contaminated condensate back into the pump.