Edwards iXM Series Instruction Manual page 35

CAUTION: HIGH PRESSURE IN PIPELINE
Risk of damage to the equipment. The systems continuously have maximum exhaust
line pressure limit. Operation above the limit can damage the pumping mechanism.
The system has an exhaust pressure sensor which will give warnings and alarms when
the pump is operated for at least 20 seconds above the limits. The pump will
continue to run with a warning, however an alarm will cause the pump to stop. You
must provide an exhaust system with sufficient conductance to make sure that the
exhaust pressure limit is not normally exceeded.
Do not reuse any O-ring or O-ring assembly and do not allow debris to get into the
system during installation.
When you connect the system to the vacuum system, do the steps that follows:
▪ To get the best pumping speed use the minimum length of pipeline to connect the
vacuum system to the pumping system. Make sure that the internal diameter of
the pipe is not less than the diameter of the system inlet port.
▪ All components in the vacuum pipeline must have a maximum pressure rating
higher than the highest pressure that can be produced in the pumping system.
▪ Use flexible pipelines in the vacuum pipeline to decrease the transmission of
vibration and to prevent loading of coupling joints. We recommend to use the
braided flexible pipelines.
▪ For T variants, make sure that the exhaust pipelines are rated for 130 °C at the
point of connection to the pump.
▪ For TX variants, make sure that the exhaust pipelines are rated for 160 °C at the
point of connection to the pump.
▪ For all other variants, make sure that the exhaust pipelines are rated for 110 °C.
▪ We recommend the use of seals at joints where the continuous operating
temperature of the exhaust is higher than 160 °C.
▪ Give sufficient support to the vacuum/exhaust pipelines to prevent the
transmission of stress to pipeline coupling joints.
▪ Use a pressure gauge in the inlet pipeline to make sure that the system operates
correctly.
▪ The system inlet must be able to be isolated from the atmosphere and from the
vacuum system if corrosive chemicals are pumped.
▪ Install a check valve to the outlet of the system exhaust pipe to prevent the suck
back of exhaust vapours after the system is shut down. The check valve also
provides additional reduction of the pulses in exhaust pressure.
▪ For dusty applications, use a low impedance inlet filter to limit the damage to the
pump.
M56635880_D
M56635880_D - Installation
Page 32 10/2020 - ©Edwards Limited