Edwards CDX Instruction Manual

Atex chemical dry pump systems

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P60074500

Issue E

Instruction Manual

ATEX Chemical Dry Pump Systems

Original Instructions

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Page 1 P60074500 Issue E Instruction Manual ATEX Chemical Dry Pump Systems Original Instructions...
Page 2 This page has been intentionally left blank.
Page 3: Table Of Contents
Main system components ................ 5 Inlet isolation valve ..................... 5 CDX dry pump inlet flame arrestor ................... 5 The CDX dry pump and safety-critical instruments ..............7 Solvent flush (optional) ....................7 Exhaust flame arrestor ....................8 Dry pump outlet gas temperature sensor ................8 2.6.1...
Page 4 Publication number Vacuum pump and vacuum system safety P40040100 Trademark credits Edwards and the Edwards logo are trademarks of Edwards Limited, Innovation Drive, Burgess Hill, West Sussex RH15 9TW. Page ii © Edwards Limited 2020. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 5: Introduction
Introduction Scope and definitions This manual provides installation, operation and maintenance instructions for ATEX CDX dry pump systems. The system must be used as specified in this manual. Read this manual before installing and operating the system. Important safety information is highlighted as WARNING and CAUTION instructions; these instructions must be obeyed.
Page 6 Where such special conditions do apply, an 'X' suffix is added to the ATEX certificate number (Category 1 systems) or the TCF reference. For example: or technical documentation reference (category 2 systems) as follows; Page 2 © Edwards Limited 2020. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 7: Pump System Protection Concept
Section 1.5.1 (refer to Table Category 2 systems Category 2 systems require one means of protection. The CDX dry pump uses containment by fitting flame arrestors or by constructional safety (see Table Table 1 - Protection concepts used Type of Pump...
Page 8 P60074500 Issue E It has been shown by test that the CDX pump will not create an internal or external auto-ignition of flammable gases under all conditions of normal use (as defined in this manual) or when stopping due to a power failure or emergency stop operation.
Page 9: Main System Components
CDX dry pump inlet flame arrestor WARNING Flame arrestors must be directly connected to the CDX Dry Pump. Do not use any inter connecting spool pieces or elbows as there is a risk that the flame arrester won't function correctly.
Page 10: Cdx Dry Pump Fitted With Integral Flame Arrestors
P60074500 Issue E Figure 1 - CDX dry pump fitted with integral flame arrestors Figure 2 - CDX dry pump fitted with external flame arrestors Page 6 © Edwards Limited 2020. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 11: The Cdx Dry Pump And Safety-Critical Instruments
(refer to Section 1.5.1.2). © Edwards Limited 2020. All rights reserved. Page 7 Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 12: Exhaust Flame Arrestor
Do not use any inter connecting spool pieces or elbow as there is a risk that the flame arrester won't function correctly. The CDX pump can be fitted with either an integral exhaust flame arrestor or it can be fitted with a flanged, in-line, eccentric external flame arrestor (See Figure 1 and 2).
Page 13: Dry Pump Outlet Gas Pressure Sensor
5.4). Please note that this option is available from Edwards. The pressure limit ensures the integrity of the flame arrestor elements (if fitted) and the temperature class of the dry pump, and also ensures reliable operation of the dry pump.
Page 14 The safe operating limits vary from category 1, category 2 and category 3 systems as defined by Table 3,4 and 5. Page 10 © Edwards Limited 2020. All rights reserved. Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 15: Normal Operation
The approved external inlet and exhaust flame arrestors may only be directly mounted on the dry pump inlet and outlet flanges, that is, do not fit any devices in between the pump flanges and the flame arrestors. © Edwards Limited 2020. All rights reserved. Page 11 Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 17: Abnormal Use
Use in an external atmosphere where there is a potentially flammable dust atmosphere.  Use on a system or flammable process that causes ingress of metallic particles into the chemical dry pump.  © Edwards Limited 2020. All rights reserved. Page 13 Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 19: System Data
The minimum shaft seal purge supply pressure must be 0.3 barg. Pump temperature WARNING To maintain the ATEX certification of the CDX dry vacuum pump system, it is mandatory to control the dry pump operating temperature. Refer to Table 2 for the mandatory pump oil trip temperatures and pressures.
Page 20: Safety Critical Dry Pump Gas Temperature And Pressure
Not applicable Not applicable Not applicable Note: Edwards approved flame arrestors (integral flame arrestor instruction manual P6007200 and external flame arrestor instruction manual P60072100) must be used for ATEX certification to apply. If in doubt, consult Edwards for advice. Page 16 ©...
Page 21: Ambient Temperature And Humidity Range
When operating in ambient temperature between -20 °C and -5 °C it is recommended that the system should only be turned off for maintenance. Consideration should be given to trace heating process pipes where there is a risk of condensation producing harmful materials inside the pumping system. If in doubt, consult Edwards for advice.
Page 23: Installation
Ensure that the dry pump system exhaust is not overloaded. The system instruction manual specifies allowable flange loads for directly mounted exhaust assemblies. For any other configuration consult Edwards for advice. © Edwards Limited 2020. All rights reserved. Page 19 Edwards and the Edwards logo are trademarks of Edwards Limited.
Page 24: Electrical Installation
The electrical parts of the dry pump system supplied by Edwards have been electrically tested to ensure that all earth (ground) connections and insulation properties for items that can become electrically live conform to European standard EN60204.
Page 25: Atex Safety Interlock Circuits
Before operating the system, Edwards recommends that a system leak check should be carried out. If vacuum leak check equipment is not available, a pressure rise test can be carried out to determine the leak rate into the system.
Page 26: Setting Of Process Specific Flow Control Valves
Ensure that the valves are correctly set during commissioning and that any consequences of incorrect operation have been considered and hazards avoided. All such devices that are supplied as standard modules by Edwards have been integrated into systems safely and any operational details specific to such devices are included in the module instruction manuals.
Page 27: Operation
P60074500 Issue E Operation The system as supplied by Edwards must be operated as defined in this manual. There are no mandatory requirements other than those specified in Section 5. However, this is an ATEX approved system and no modifications may be made...
Page 29: Maintenance
CDX dry pumps WARNING CDX dry pumps are designed to prevent the transmission of an internal ignition to a potentially flammable external atmosphere. When carrying out maintenance activities that require disassembly of critical components (refer to dry pump manual A70801880 Sections 5.9 and 5.14), ensure that the activity is carried out as specified in the pump manual.
Page 30: Dry Pump Motor Coupling
Integral flame arrestors The integral flame arrestors are located on the inlet and outlet of the CDX dry pump and consist of a cast housing that is bolted to the pump main body and a flame arrestor element that is located inside the cast housing. The housing is fitted with an access port enabling element removal and also carries instrument ports into which are screwed the necessary temperature and pressure sensors.
Page 31: Temperature Sensor Devices
Download the latest documents from www.edwardsvacuum.com/HSForms/, follow the procedure in HS1, fill in the electronic HS2 form, print it, sign it, and return the signed copy to Edwards. Note: If we do not receive a completed HS2 form, your equipment cannot be serviced.
Page 32 edwardsvacuum.com...

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