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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 pumps to 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.
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.
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.
Ensure that the pressure in the exhaust pipeline does not exceed 6 psi.
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