BOC Edwards A343-10-940, Инструкция по эксплуатации

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E1M18 and E2M18 Rotary Vacuum Pumps
OPERATION
PAGE
26
Issue L 26 Sep 06
4.5 To pump condensable vapours
Use gas-ballast (open the gas-ballast control) when there is a high proportion of condensable vapours in
the process gases:
1. Close the vacuum system isolation-valve.
2. Turn the gas-ballast control anti-clockwise to fully open and operate the pump for 30 minutes to
warm the oil; this will help to prevent vapour condensation in the pump.
3. Open the vacuum system isolation-valve and continue to operate the pump with the gas-ballast
control open.
After you have pumped condensable vapours, you can (if necessary) decontaminate the oil; use the
procedure in Section 4.6.
4.6 To decontaminate the oil
The oil in the pump should be clear, if the oil is cloudy or discoloured, it is contaminated with process
vapours.
1. Look at the condition of the oil in the oil sight-glass (Figure 1, item 12). If the oil is cloudy or
discoloured, continue with the procedure at Step 2 below.
2. Close the vacuum system isolation-valve.
3. Turn the gas-ballast control fully anti-clockwise.
4. Operate the pump until the oil is clear.
4.7 Unattended operation
The pump is designed for unattended operation under the normal operating conditions specified in
Section 2.1. However, we recommend that you check the pump at a regular interval of not more than
14 days; check the pump more frequently if you pump high volumes of gas or if you operate the pump
with the gas-ballast control open.
Single-phase motors are cooled by internal fans. These motors have a thermal overload device. When
the motor is too hot, the thermal overload device switches off the pump. The thermal overload device
has an automatic reset; when the motor cools down, the device resets and the motor will restart.
When you check the pump, make sure that the pump is not going through a repetitive cycle of thermal
overload failures and automatic resets. If necessary reduce the thermal load from the pumped gases, to
prevent overheating of the pump.