Installation; Safety; System Design Considerations - Edwards RV3 Instruction Manual

3

Installation

3.1

Safety

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.
Edwards recommends that a hydrocarbon-prepared RV pump is not used for pumping hazardous
substances. PFPE-prepared pumps are suitable for oxygen applications: refer to
Obey the safety instructions in this Section and take note of appropriate precautions. If not, injury
to people and damage to equipment can result.
Prevent any part of the human body from coming into contact with the vacuum.
Ensure that the RV pump is suitable for the application. If there is any doubt as to the suitability of the RV pump for
the application, refer to the Edwards guidelines on vacuum pump and vacuum system safety (see the Associated
publications at the end of the Contents list at the front of this manual), or contact Edwards for advice.
A suitably trained and supervised technician must install the RV pump. Obey the safety instructions listed below when
installing the pump, especially when connecting the pump into an existing system. Details of specific safety
precautions are given at the appropriate point in the instructions.
Wear the appropriate safety-clothing when coming into contact with contaminated components is

anticipated. Dismantle and clean contaminated components inside a fume cupboard.
Vent and purge the vacuum system before starting installation work.

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.
Safely route any electrical supply cables to prevent a trip hazard.

3.2

System design considerations

Consider the following points when designing the pumping system:
Edwards recommends the use of a foreline vacuum isolation valve to allow the pump to warm up before

pumping condensable vapours or if a vacuum needs to be maintained when the pump is not running.
Avoid high levels of heat input to the pump from the process gases, otherwise the pump may overheat and

seize, and cause the motor thermal overload device to open.
If using the pump in a high ambient temperature with a high gas throughput, the temperature of the

pump-body may exceed 70°C. Edwards recommends the use of additional guarding to prevent contact with
hot surfaces under these conditions.
Make sure that the exhaust pipeline cannot become restricted. Maximum exhaust pressure is shown in

Table 2. If an exhaust-isolation valve is fitted, ensure the pump cannot be operated the pump with the valve
closed.
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WARNING
WARNING
A652–01–880 Issue Y
Section 8.
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