Edwards CDP User manual

A386-11-880
Issue E Original
Instruction Manual
CDP/QDP/iQDP accessories:
Exhaust-Silencers
Description Item Number
CDP Exhaust-Silencer A386-11-000
QDP/iQDP Exhaust-Silencer A528-19-000

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Contents
A386-11-880 Issue E
Contents
Section Page
1 Introduction .......................................................................................1
1.1 Scope and definitions ................................................................................................... 1
1.2 Description ................................................................................................................ 1
1.3 Construction .............................................................................................................. 1
1.4 Principle of operation ................................................................................................... 1
2 Technical Data ....................................................................................3
2.1 Mechanical data .......................................................................................................... 3
2.2 Performance .............................................................................................................. 3
2.3 Operating and storage conditions ..................................................................................... 3
2.4 Construction materials .................................................................................................. 3
3 Installation .........................................................................................5
3.1 Safety ......................................................................................................................5
3.2 System requirements .................................................................................................... 5
3.3 Unpack and inspect ...................................................................................................... 6
3.4 Remove the old Exhaust-Silencer (if necessary) .................................................................... 6
3.5 Fit the new Exhaust-Silencer .......................................................................................... 9
3.5.1 Fit the new Exhaust-Silencer to a QDP, iQDP or CDP i, Ei or Si pump ........................................... 9
3.5.2 Fit the new Exhaust-Silencer to a CDP Ni pump ...................................................................10
3.6 Leak-test the installation ..............................................................................................14
4 Maintenance ..................................................................................... 15
4.1 Introduction .............................................................................................................15
4.1.1 Safety information ......................................................................................................15
4.1.2 Overheated fluorinated materials ....................................................................................15
4.2 Frequency of maintenance ............................................................................................15
4.3 Inspect and clean the Exhaust-Silencer .............................................................................16
5 Storage and Disposal ........................................................................... 17
5.1 Storage ...................................................................................................................17
5.2 Disposal ...................................................................................................................17
6 Spares and Accessories ........................................................................ 19
6.1 Introduction .............................................................................................................19
6.2 Spares .....................................................................................................................19
For return of equipment, complete the HS Forms at the end of this manual.
edwards JP 07/09

A386-11-880 Issue E
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Contents
Illustrations
Figure Page
1 Components of the Exhaust Silencer ................................................................................. 2
2 Dimensions (mm) (CDP Exhaust-Silencer shown) ................................................................... 3
3 Correct and incorrect installation configurations .................................................................. 7
4 QDP pump services ...................................................................................................... 8
5 Correct mounting clamp orientation (CDP pump shown) .........................................................10
6 Installation of the Exhaust-Silencer on CDP i, Ei and Si pumps ..................................................11
7 Installation of the Exhaust-Silencer on QDP and iQDP pumps ...................................................12
8 Installation of the Exhaust-Silencer on CDP Ni .....................................................................13
Associated publications
Publication title Publication number
Vacuum pump and vacuum system safety P400-40-100

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Introduction
A386-11-880 Issue E
1Introduction
1.1 Scope and definitions
This manual provides installation, operation and maintenance instructions for the Edwards CDP and QDP/iQDP
Exhaust-Silencers. You must use the Exhaust-Silencer as specified in this manual.
Read this manual before you install the Exhaust-Silencer. Important safety information is highlighted as WARNING
and CAUTION instructions; you must obey these instructions. The use of WARNINGS and CAUTIONS is defined below.
CAUTION
Cautions are given where failure to observe the instruction could result in damage to the equipment, associated
equipment and process
The units used throughout this manual conform to the SI international system of units of measurement.
1.2 Description
Two models of Exhaust-Silencer are available, one model for use with the Edwards CDP range of pumps and one model
for use with the Edwards QDP and iQDP ranges of pumps. The two models are identical, except that the Exhaust-
Silencer for the CDP pumps has mounting hooks (Figure 1, item 14).
The Exhaust-Silencer attenuates the pulses in the exhaust pressure from the pump and reduces pump-induced
resonance in your exhaust-extraction system.
The Exhaust-Silencer is suitable for use with all of the corrosive and particulate gases typically used in semiconductor
applications and is designed for ease of maintenance.
1.3 Construction
Refer to Figure 1 in the following description.
The body of the Exhaust-Silencer (5) has a two-stage expansion chamber (6, 9) which is separated by a baffle-plate
(8) at one end of the body. Both ends of the body of the Exhaust-Silencer have an end-cover plate (3, 12) which is
retained by cap-head bolts (1) and sealed by a fluoroelastomer ‘O’ ring (4, 10).
Inlet and outlet connections (15, 13) to the Exhaust-Silencer are standard NW40 flanges.
1.4 Principle of operation
Exhaust gases from the pump-outlet enter the Exhaust-Silencer through the inlet (15) and pass into the first-stage
expansion chamber (9). The gases then pass through the transfer tube (7) into the second-stage expansion chamber
(6) and then pass through the outlet tube (16) to the outlet of the Exhaust-Silencer (13).
The internal transfer and outlet tubes (6, 16) provide a long attenuation path for the exhaust gases.
Materials which sublime from the pump exhaust gases will collect in the expansion chambers of the Exhaust-Silencer.
These materials must be removed regularly from the Exhaust-Silencer to maintain its efficiency (refer to Section 4).
WARNING
Warnings are given where failure to observe the instruction could result in injury or death to
people.

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Introduction
Figure 1 - Components of the Exhaust Silencer
1. Cap-head bolt
2. Washer
3. End-cover plate
4. ‘O’ ring
5. Silencer body
6. 2nd-stage expansion chamber
7. Transfer tube
8. Baffle-plate
9. 1st-stage expansion chamber
10.‘O’ ring
11.‘O’ ring
12.End-cover plate
13.Outlet flange
14.Mounting hook (CDP Exhaust
Silencer only)
15.Inlet flange
16.Outlet tube

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Technical Data
A386-11-880 Issue E
2TechnicalData
2.1 Mechanical data
2.2 Performance
2.3 Operating and storage conditions
2.4 Construction materials
Figure 2 - Dimensions (mm) (CDP Exhaust-Silencer shown)
Dimensions See Figure 2
Mass 5.5 kg
Inlet connection NW40
Outlet connection NW40
Maximum throughput 80 m3h-1
Maximum back-pressure 3 psig (at maximum throughput)
Exhaust gas temperature range 5 to 150 ºC
Exhaust pulse attenuation 30 dB(A)
Leak tightness better than 1 x 10-5 mbar.ls-1
(1 x 10-3 Pa.ls-1) helium
Ambient temperature range (operation) 5 to 40 ºC
Ambient temperature range (storage) -30 to 50 ºC
Maximum ambient humidity (operation) 90% RH
Maximum ambient humidity (storage) 97% RH (non-condensing)
Silencer body Stainless steel, ISI grade 304L
‘O’ rings Fluoroelastomer

A386-11-880 Issue E
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Technical Data

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Installation
A386-11-880 Issue E
3 Installation
3.1 Safety
A suitably trained and supervised technician must install the Exhaust-Silencer.
Ensure that the installation technician is familiar with the safety procedures which relate to the products
processed by the pumping system. Wear the appropriate safety-clothing when you come into contact with
contaminated components and dismantle and clean contaminated components inside a fume-cupboard.
Vent and purge the pumping system before you start installation work.
Check that all the required components are available and of the correct type before you start work.
Disconnect the components in the pumping system from the electrical supply so that they cannot be
operated accidentally.
Do not re-use ‘O’ rings and Co-Seals if they are damaged.
Leak-test the system after installation and seal any leaks found to prevent leakage of dangerous substances
out of the system and leakage of air into the system.
3.2 System requirements
The Exhaust-Silencer (and the exhaust check-valve) are designed to be installed directly onto the Edwards CDP, QDP
and iQDP ranges of pumps; fitting kits are supplied with the pumpsto enable you to fit these accessories. If necessary,
you can mount the accessories in alternative positions, provided that you obey the following rules:
Always mount the Exhaust-Silencer so that it is horizontal.
Incorporate flexible bellows in the exhaust pipeline to reduce the transmission of vibration and to prevent
loading of coupling joints. Ensure that you use bellows which have a maximum pressure rating which is
greater than the highest pressure that can be generated in the exhaust pipeline. We recommend that you use
Edwards bellows.
Figure 3 shows correct and incorrect installation configurations; further information on installation configurations is
given in the instruction manual supplied with the CDP, QDP or iQDP pump.
Incorporate suitable control equipment to monitor the pressure in the exhaust pipeline and to switch off the nitrogen
purge supply when the pressure in the exhaust pipeline exceeds 6 psi. If you do not, the exhaust pipeline could be
pressurised up to the nitrogen supply pressure.
WARNING
Obey the safety instructions given below and take note of appropriate precautions. If you do not,
you can cause injury to people and damage to equipment.
WARNING
Use bellows which have a suitable pressure rating. If the exhaust pipeline is blocked, the CDP, QDP
and iQDP pumps can generate pressures of up to 7 bar in the pipeline.
WARNING
Ensure that the pressure in the exhaust pipeline does not exceed 6 psi.

A386-11-880 Issue E
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Installation
If the Exhaust-Silencer is to be fitted to a new pump, locate the pump in its operating position before you fit the
Exhaust-Silencer. If you do not, you may damage the Exhaust-Silencer when you move the pump.
3.3 Unpack and inspect
Remove all packing materials and protective covers and check the Exhaust-Silencer.
If the Exhaust-Silencer is damaged, notify your supplier and the carrier in writing within three days; state the Item
Number of the Exhaust-Silencer together with your order number and your supplier’s invoice number. Retain all
packing materials for inspection. Do not use the Exhaust-Silencer if it is damaged.
If the Exhaust-Silencer is not to be used immediately, replace the protective covers. Store the Exhaust-Silencer in
suitable conditions, as described in Section 6.
3.4 Remove the old Exhaust-Silencer (if necessary)
Note: The following procedure assumes that the old Exhaust-Silencer has been installed in the recommended
configuration.
1. Release the NW40 clamp which secures the inlet-flange of the Exhaust-Silencer to the CDP, QDP or iQDP pump
outlet or the outlet of the long NW40 elbow connected to the outlet of the CDP, QDP or iQDP pump. Remove the
clamp and the Co-Seal.
2. Release the NW40 clamp which secures the outlet-flange of the Exhaust-Silencer to the exhaust check-valve.
Remove the clamp and the Co-Seal.
3. On CDP pumps only: Remove the 2 ‘O’ rings from each of the 3 mounting hooks on the Exhaust-Silencer, then
remove the Exhaust-Silencer from the pump.
4. On QDP and iQDP pumps only: Slide the Exhaust-Silencer out towards the high-vacuum end of the pump to
remove the Exhaust-Silencer from the pump. Alternatively, undo the two support-plate retaining screws (Figure
4, item 7) and slide the Exhaust-Silencer complete with the support-plate towards the motor end of the pump.
WARNING
Substances which accumulate in the Exhaust-Silencer may be dangerous. Do not allow these
substances to come into contact with your skin or eyes. Do not inhale vapours from these
substances.

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Installation
A386-11-880 Issue E
Figure 3 - Correct and incorrect installation configurations
1. CDP/QDP/iQDP/pump
2. Pipeline support
3. Flexible bellows
4. Exhaust check-valve
5. Bottom mounted Exhaust Silencer
6. Side mounted Exhaust Silencer (CDP Ni only)
7. CDP/QDP/iQDP pump
8. Flexible bellows (incorrectly installed)
9. Exhaust check-valve
10.Exhaust Silencer (incorrectly installed)

A386-11-880 Issue E
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Installation
Figure 4 - QDP pump services
1. Exhaust-purge supply
2. Inlet-purge supply
3. 17-way electrical connector
4. Water return connector
5. Water services panel
6. Water supply connector
7. Exhaust support-plate retaining screw
8. Exhaust silencer
9. Electrical services panel
10.Gas services panel
11.Gas-ballast boost supply
12.Shaft-seals purge supply
13.2/3-interstage purge supply

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Installation
A386-11-880 Issue E
3.5 Fit the new Exhaust-Silencer
Note: The procedures in Sections 3.5.1 and 3.5.2 assume that the new Exhaust-Silencer will be installed in the
recommended configuration.
3.5.1 Fit the new Exhaust-Silencer to a QDP, iQDP or CDP i, Ei or Si pump
Refer to Figures 6 and 7 to determine the correct installation configuration for your pump and fit the new Exhaust-
Silencer as described below.
1. Remove the protective covers from the inlet- and outlet-flanges of the Exhaust-Silencer and check that the
sealing-faces of the flanges are clean and are not damaged.
2. If you have a new pump, remove the protective cover from the outlet of the NW40 long elbow fitted to the
outlet of the pump.
3. Check that the sealing-face on the outlet of the NW40 long elbow is clean and is not damaged.
4. Check that the mounting clamp which secures the long elbow to the outlet of the pump is correctly orientated;
the clamping-bar must be parallel with and in its closest position to the pump, as shown in Figure 5.
5. If the Exhaust-Silencer is to be fitted to a QDP80, iQDP80 or CDP80 i, Ei or Si pump, use the NW40 Co-Seal and
clamp supplied to fit the 50 mm NW40 straight adaptor supplied to the outlet of the Exhaust-Silencer.
6. On CDP pumps only:
Position the Exhaust-Silencer underneath the pump.
Check that the inlet of the Exhaust-Silencer is correctly orientated with the long NW40 elbow, then fit the
‘O’ rings on the mounting hooks on the pump to the corresponding mounting hooks on the Exhaust-Silencer.
7. On QDP and iQDP pumps only: Slide the Exhaust-Silencer in from the high-vacuum end of the pump.
Alternatively, slide the Exhaust-Silencer complete with the support-plate in from the motor end of the pump and
tighten the support-plate retaining screws (Figure 4, item 7).
8. Use the NW40 Co-Seal and clamp supplied to fit the inlet of the Exhaust-Silencer to the outlet of the NW40 long
elbow on the outlet of the pump.
9. Use the NW40 Co-Seal and clamp supplied to connect the Exhaust-Silencer to the exhaust check-valve.

A386-11-880 Issue E
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Installation
Figure 5 - Correct mounting clamp orientation (CDP pump shown)
3.5.2 Fit the new Exhaust-Silencer to a CDP Ni pump
The correct installation configuration for your pump is shown in Figure 8. Fit the new Exhaust-Silencer as described
below.
1. Remove the protective covers from the inlet- and outlet-flanges of the Exhaust-Silencer and check that the
sealing-faces of the flanges are clean and are not damaged.
2. If you have a new pump, remove the protective cover from the outlet of the pump and check that the sealing-
face of the outlet is clean and is not damaged.
3. Use the NW40 Co-Seal and clamp supplied to fit the inlet of the Exhaust-Silencer to the outlet of the pump.
4. Use the NW40 Co-Seal and clamp supplied to connect the Exhaust-Silencer to the exhaust check-valve.

© Edwards Limited 2008. All rights reserved. Page 11 Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
A386-11-880 Issue E
Figure 6 - Installation of the Exhaust-Silencer on CDP i, Ei and Si pumps
1. Exhaust check-valve
2. Exhaust-Silencer
3. Mounting clamp

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Installation
Figure 7 - Installation of the Exhaust-Silencer on QDP and iQDP pumps
1. Exhaust check-valve
2. Clamp
3. Exhaust-Silencer
4. Alternative outlet position
5. Mounting clamp

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Installation
A386-11-880 Issue E
Figure 8 - Installation of the Exhaust-Silencer on CDP Ni
1. Exhaust check-valve
2. Exhaust-Silencer
3. Mounting clamp

A386-11-880 Issue E
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Installation
3.6 Leak-test the installation
Leak-test the system after installation and seal any leaks found. Dangerous substances which leak from the system
will be dangerous to people and there may be a danger of explosion if air leaks into the system. We recommend that
the leak rate is 1 x 10-5 mbar.ls-1 (1 x 10-3 Pa.ls-1) helium or less.
WARNING
Leak-test the system after installation and seal any leaks found to prevent leakage of dangerous
substances out of the system and leakage of air into the system.

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Maintenance
A386-11-880 Issue E
4Maintenance
4.1 Introduction
4.1.1 Safety information
Ensure that the maintenance technician is familiar with the safety procedures which relate to the products
processed by the pumping system. Wear the appropriate safety-clothing when you come into contact with
contaminated components. Dismantle and clean contaminated components inside a fume-cupboard.
Vent and purge the pumping system before you start maintenance work.
Check that all the required components are available and of the correct type before you start work.
Disconnect the other components in the pumping system from the electrical supply so that they cannot be
operated accidentally.
Do not reuse ‘O’ rings and Co-Seals if they are damaged.
Leak-test the system after maintenance if you have connected or disconnected any vacuum joints. Seal any
leaks found to prevent leakage of dangerous substances out of the system and leakage of air into the system.
4.1.2 Overheated fluorinated materials
Fluorinated materials are used in the Exhaust-Silencer and the CDP, QDP and iQDP pumps. Fluorinated materials are
safe in normal use but can decompose into very dangerous substances (which may include hydrofluoric acid) if they
are heated to 260 ºC and above.
The Exhaust-Silencer or the pump may have overheated if they were misused, malfunctioned or were in a fire. If the
Exhaust-Silencer or pump has overheated, take extreme care to avoid skin contact with any part of the Exhaust-
Silencer and pump and to avoid inhalation of vapours from the Exhaust-Silencer andpump. Edwards Health and Safety
Data sheets for the fluorinated materials used in the pump and the Exhaust-Silencer are available on request: contact
your supplier or Edwards.
4.2 Frequency of maintenance
We recommend that you inspect and clean the Exhaust-Silencer at least every three months. However in practice,
the frequency of maintenance is dependent on your process. In clean processes, you may be able to decrease the
frequency of maintenance; in harsh processes you may have to increase the frequency of maintenance. Adjust the
frequency of maintenance according to your experience.
WARNING
Obey the safety instructions given below and take note of appropriate precautions. If you do not,
you can cause injury to people and damage to equipment.
WARNING
Do not touch or inhale the thermal breakdown products of fluorinated materials which may be
present if the Exhaust-Silencer or the pump has been heated to 260 ºC and above. These
breakdown products are very dangerous. Fluorinated materials in the Exhaust-Silencer and pump
may include oils, greases and seals.

A386-11-880 Issue E
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Maintenance
4.3 Inspect and clean the Exhaust-Silencer
Refer to Figure 1 and dismantle, inspect and clean the silencer as described below. When you maintain the Exhaust-
Silencer, use an Edwards Exhaust-Silencer service kit. This kit contain all of the seals and other components necessary
to complete maintenance operations successfully. The Item Number of the service kit is given in Section 6.
1. Remove the Exhaust-Silencer from the pump as described in Section 3.4.
2. Weigh the silencer. If the mass of the silencer is greater than 7.5 kg, dismantle, clean and reassemble the
silencer as in Steps 3 to 10 below. If the mass of the silencer is below 7.5 kg, it does not need to be cleaned;
refit the silencer as in Step 11.
3. Remove and retain the six bolts and washers (1, 2) which secure each end-cover plate (3, 12) to the silencer
body (5). Pull the end-cover plates squarely from the outlet pipe (16) to remove them.
4. Remove the three ‘O’ rings (4, 10, 11) from the silencer and discard.
5. Empty all loose deposits from the silencer body; take care not to damage the end-cover plate sealing surfaces.
6. Use a suitable tool to dislodge remaining deposits, then wash the silencer body with steam or water. Finally,
glass-bead blast the silencer body. If required, use a cleaning solution suitable for the nature of the deposits.
7. Inspect the silencer for internal corrosion and check that the wall of the silencer body is not excessively eroded.
Inspect the end-cover plate and inlet and outlet flange sealing-faces for damage and refinish if necessary. If
silencer damage is excessive, it should be replaced.
8. Check that the ‘O’ ring grooves are clean. Apply a light wipe of vacuum grease and place the new ‘O’ rings in
position.
9. Refit the end-cover plates and secure with the bolts and washers removed in Step 3. Tighten the bolts
progressively; alternate between bolts on opposite sides of the end-cover plate. Tighten to a torque of 10 Nm.
10.Leak-test the silencer.
11.Refit the Exhaust-Silencer to the pump:
For QDP, iQDP and CDP i, Ei and Si pumps, refer to Steps 6 to 9 of Section 3.5.1.
For CDP Ni pumps, refer to Steps 3 and 4 of Section 3.5.2.
WARNING
Substances which accumulate in the Exhaust-Silencer may be dangerous. Do not allow these
substances to come into contact with your skin or eyes. Do not inhale vapours from these
substances.