System Design Considerations - Edwards XDS35iC Instruction Manual

▪ Leak test the system after installation is complete and seal any leaks found to
prevent leakage of hazardous substances out of the system and leakage of air into
the system.
▪ Mechanical lifting equipment should be attached to the lifting eye on the pump.
▪ Loose slings should not be used to lift the pump.

4.2 System design considerations

WARNING:
Ensure the exhaust pipeline cannot become blocked. If an exhaust isolation valve is
fitted, ensure the pump cannot be operated with the valve closed.
Consider the following points when designing the pumping system:
We recommend the use of a foreline vacuum isolation valve to allow the pump to warm
up before pumping condensible vapours or if the vacuum needs to be maintained when
the pump is not running.
Avoid high levels of heat input into the pump from the process gases, otherwise the
pump may overheat and cause the thermal overload device to open.
If the pump is used in a high ambient temperature with high gas throughput, the pump
body temperature may approach 65 °C. We recommend the use of additional guarding
to prevent contact with hot surfaces under these conditions.
Dilute flammable mixtures to safe concentrations by providing an inert gas dilution
purge. Contact our applications team for further advice on dilution requirements if
required.
A73001880_N
A73001880_N - Installation
Page 18 11/2020 - ©Edwards Limited